CN109000837B - Method for monitoring interface stress between hot-press curing composite material part and mould - Google Patents
Method for monitoring interface stress between hot-press curing composite material part and mould Download PDFInfo
- Publication number
- CN109000837B CN109000837B CN201810437824.3A CN201810437824A CN109000837B CN 109000837 B CN109000837 B CN 109000837B CN 201810437824 A CN201810437824 A CN 201810437824A CN 109000837 B CN109000837 B CN 109000837B
- Authority
- CN
- China
- Prior art keywords
- composite material
- data acquisition
- strain
- acquisition sheet
- sheet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L5/00—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes
- G01L5/0047—Apparatus for, or methods of, measuring force, work, mechanical power, or torque, specially adapted for specific purposes measuring forces due to residual stresses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/002—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L1/00—Measuring force or stress, in general
- G01L1/20—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress
- G01L1/22—Measuring force or stress, in general by measuring variations in ohmic resistance of solid materials or of electrically-conductive fluids; by making use of electrokinetic cells, i.e. liquid-containing cells wherein an electrical potential is produced or varied upon the application of stress using resistance strain gauges
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- General Physics & Mathematics (AREA)
- Casting Or Compression Moulding Of Plastics Or The Like (AREA)
Abstract
The invention provides a method for monitoring interface stress of a hot-press curing composite material part and a mould, which comprises the steps of monitoring by using an interface stress monitoring system, wherein the system comprises a composite material supporting plate, the composite material part to be subjected to hot-press curing treatment arranged on the supporting plate, a data acquisition sheet arranged above the composite material part and a strain gauge fixedly arranged on the upper surface of the data acquisition sheet, the thickness of the data acquisition sheet is less than 0.4mm, and the peripheral size of the data acquisition sheet is the same as the peripheral size of the composite material part or the peripheral size difference of the data acquisition sheet and the composite material part is not more than +/-0.5 mm; after the system is used for detecting the strain data, multiplying the strain data by the elastic modulus data of the material used by the data acquisition sheet to obtain the interface stress of the composite material part and the die. The invention can calculate the interface shear stress by the elastic modulus of the die material and the measured strain gauge, and has operability.
Description
Technical Field
The invention relates to the field of composite material preparation by hot-pressing curing, in particular to an online monitoring method for interface stress between a composite material workpiece and a mold in the preparation process of a hot-pressing curing composite material.
Background
The resin-based composite material is widely applied to the fields of aerospace, automobiles, ships and the like due to excellent performance. The autoclave molding process (thermocompression curing preparation) is widely applied to the molding and manufacturing of resin-based composite materials. However, the deformation of the composite material product after demoulding is serious, which affects the forming precision, and the factors affecting the deformation of the product can be roughly divided into: the last factor, of particular concern, is the uneven cure shrinkage, the difference in the coefficients of thermal expansion of the resin and carbon fibers, and the residual stresses caused by the interaction of the mold and the part, cause distortion of the part. However, at present, few studies are made at home and abroad on the interaction between the mold and the workpiece in the whole curing process. The use of fiber optic methods to detect stress has been reported, and specifically, the use of fiber optic embedded at the interface between the composite part and the mold during the preparation of hot-press cured composites. For example, patent application 201611117838.4 provides a method for monitoring internal stress of a spacecraft composite structure during aging, and patent application CN201611146925.2 provides a device and method for monitoring fiber composite material during hot-pressing, curing and deformation. But the optical fiber method is difficult to detect the stress data on line. In addition, there is also a report of monitoring stress data using a strain gauge, which is an element for measuring strain composed of a sensitive grid or the like. The working principle of the resistance strain gauge is based on the strain effect, namely, when a conductor or a semiconductor material generates mechanical deformation under the action of external force, the resistance value of the conductor or the semiconductor material correspondingly changes, and the phenomenon is called as the strain effect. For example, patent application CN201610128916.4 provides a method for monitoring the interaction of a composite material with a mold during curing. In the invention, a plurality of grooves are distributed on the surface of a die contacted with a composite material, strain sensors are embedded in the grooves, and two ends of a measuring area of each sensor are fixed with the die. And converting the strain signal measured by the sensor into a stress value between the composite material and the mold, thereby realizing the monitoring of the interaction force between the composite material and the mold in the curing process. The invention realizes the effective monitoring of the interaction force between the composite material and the mould in the curing process and provides technical support for the prediction and control of the curing deformation of the composite material. The strain sensor in the method is a fiber grating sensor, a metal strain gauge or other types of strain sensors. However, the method has at least the following disadvantages:
1) in the method, the groove needs to be sealed after the sensor is embedded, so that the contact state of the interface between the die and the composite material can be changed, and the authenticity of the measurement of the stress of the interface is influenced;
2) the stress state at the groove on the die may not be the same as that at other places, so the method may affect the authenticity of the interface stress test;
3) for some materials, the difficulty of grooving of the die is high, and the operation difficulty is high, for example, the die is made of a resin matrix composite material, and fibers in the groove are difficult to remove when a fine groove is processed according to the method, so that the authenticity of an interface stress test is further influenced;
4) in the method, if the optical fiber is used as a sensor, the optical fiber is bent when being led out of the groove, and great influence is caused on measurement.
Therefore, the method has the problem that whether the measured data can truly reflect the interface stress between the die and the composite material part or not, and meanwhile, the operability of the method is poor. Therefore, there is still a need in the art to develop a new system and method for monitoring the interfacial stress between a composite material part and a mold during the preparation of a hot-press curing resin-based composite material, so as to accurately study the interfacial stress and prevent the composite material part from being seriously deformed after demolding.
Disclosure of Invention
Therefore, the invention firstly provides a method for monitoring the interface stress of a hot-press curing composite material part and a mould, which comprises the steps of monitoring by using an interface stress monitoring system, wherein the system comprises a composite material supporting plate, the composite material part to be subjected to hot-press curing treatment arranged on the supporting plate, a data acquisition sheet arranged above the composite material part and a strain gauge fixedly arranged on the upper surface of the data acquisition sheet, the thickness of the data acquisition sheet is less than 0.4mm, and the peripheral size of the data acquisition sheet is the same as that of the composite material part or the peripheral size difference of the data acquisition sheet and the composite material part is not more than +/-0.5 mm; after the system is used for detecting the strain data, multiplying the strain data by the elastic modulus data of the material used by the data acquisition sheet to obtain the interface stress of the composite material part and the die.
In a specific embodiment, the material of the data acquisition sheet is consistent with that of a forming die for hot-pressing and curing a resin-based composite material, and preferably, the material of the data acquisition sheet is one of aluminum, steel or a cured resin-based composite material.
In the molding process of the resin-based composite material hot-pressing solidification, the thickness of the used mold is very thick relative to the data acquisition sheet.
In a specific embodiment, the material of the composite material support plate is the same as the material of the composite material part after curing, the support plate is smooth, the roughness Ra of the support plate is less than or equal to 1.6 μm, and the surface of the support plate is coated with a release agent or release cloth. This is provided to ensure that the support plate and the cured article have the same or similar coefficients of thermal expansion. The support plate is an essential part of the system of the invention and serves to keep the article from bending during curing in the system. When a thick forming die is used for vacuum hot-pressing to produce a composite material part, the supporting plate is not needed, because the size of the part to be formed is smaller than the size of the die for supporting the part in the production process, and the part of the die with the size larger than the rest of the size of the part can play the role of the supporting plate 11 in the invention.
In a specific implementation mode, the system comprises a strain acquisition device for online strain measurement, wherein the strain acquisition device comprises the strain gauge, and a strain gauge lead, a dynamic strain acquisition instrument, a connecting wire and a strain acquisition display which are sequentially connected. In the invention, the strain acquisition device comprising the strain gauge, the strain gauge lead, the dynamic strain acquisition instrument, the connecting wire and the strain acquisition display can be obtained by commercial purchase. The dynamic strain acquisition instrument uses a DS-NET dynamic data acquisition instrument.
In a specific embodiment, the system further comprises an autoclave, and the composite material support plate, the composite material part, the data acquisition sheet and the strain gauge are all arranged in the autoclave.
In a specific embodiment, the system further comprises a thermocouple arranged in the autoclave, wherein the thermocouple is arranged above the data acquisition sheet and is close to or closely attached to the strain gauge.
In a specific embodiment, the strain gauge is fixed on the data acquisition sheet by high-temperature resistant glue.
In the present invention, the strain gauge is adhered to the data acquisition sheet 10 by using a high temperature resistant adhesive, which is commercially available and is required to withstand the temperature of the thermosetting composite material in the autoclave. The strain gauge is made of a high polymer material, so that the strain gauge cannot be welded on the data acquisition sheet, and besides the adhesion fixation, the strain gauge and the data acquisition sheet can be fixed in other forms, such as a lock catch type, but the adhesion mode is preferably used.
In a specific embodiment, the peripheral dimension of the data acquisition sheet differs from the peripheral dimension of the composite article by no more than ± 0.2 mm.
In a specific embodiment, the data acquisition sheet 10 has a thickness of 0.3mm or less.
In a specific embodiment, the thickness of the composite material part to be subjected to the hot-press curing treatment, which is arranged on the support plate, is more than 0.5mm, and preferably the thickness of the part is 0.7-2 mm.
The invention also correspondingly provides a system for monitoring the interface stress of the hot-press curing composite material part and the die, which comprises a composite material supporting plate, the composite material part to be subjected to hot-press curing treatment arranged on the supporting plate, a data acquisition sheet arranged above the composite material part and a strain gauge fixedly arranged on the upper surface of the data acquisition sheet, wherein the thickness of the data acquisition sheet is less than 0.4mm, and the peripheral size of the data acquisition sheet is the same as that of the composite material part or the peripheral size difference of the data acquisition sheet and the composite material part is not more than +/-0.5 mm.
In the invention, the hot-press curing composite material is a resin-based composite material, specifically, for example, a resin and carbon fiber composite material, or a resin and glass fiber composite material. The mould is, for example, an aluminum mould, a steel mould or a resin matrix composite mould after curing and forming. In the invention, the strain gauge is obtained by purchasing, and the strain gauge used in the embodiment of the invention is a medium-temperature strain gauge resistant to 180 ℃. In the invention, the strain gauge wire is also purchased in a matching way and can also resist the temperature of 180 ℃ and above.
If the strain gauge is clamped between a workpiece positioned above and a die (the thickness of the die is generally 8-20 mm) positioned below in the process of preparing the resin-based composite material by normal hot-pressing curing, the strain gauge cannot detect data in the complex physical and chemical change process because the workpiece needs to pass through viscous state, gel state, glassy state and the like in the curing process. Therefore, it is generally difficult for those skilled in the art to use a strain gauge to detect the stress between the mold and the interface during the preparation of resin-based composite materials by thermocompression curing. In the present invention, however, the strain of the interaction between the part and the mold is indirectly measured using a data acquisition sheet 10 having a small thickness.
A composite product-mold interface stress testing system is constructed based on the force balance and equivalence principle, and the strain change rule of the interaction interface of the composite product and the mold in the curing process is obtained. The method is based on the following two assumptions: 1) it is assumed that the aluminum sheet (data acquisition sheet) does not bend throughout the curing process. 2) There is no stress gradient in the thickness direction of the aluminum sheet. In fact, in the system of the present invention, as for point 1), since the aluminum sheet and the manufactured part are closely attached to the composite material support plate under the high pressure environment, the bending phenomenon does not occur; thus the assumption is true. For the point 2), since the thickness of the aluminum sheet is very small, there is no stress gradient in the thickness direction of the aluminum sheet, i.e., the stress states or stress states of the upper and lower surfaces of the aluminum sheet are uniform, and thus the assumption is also made.
As will be appreciated by those skilled in the art, in order to avoid bending of the composite material part after curing and molding, it is necessary to know the interfacial stress between the mold for curing and molding and the part, and since the stress is strain × elastic modulus and only the strain data can be measured, the elastic modulus of the data acquisition sheet (aluminum sheet) can be used in the present invention, which is a constant, so that the interfacial stress data can be successfully obtained. However, if the strain gauge is directly attached to the interface between the composite material part and the mold to measure the strain, in such a conventional method, the elastic modulus of the composite material part needs to be measured, and due to the complexity of the components of the composite material and the complexity of the state during the molding process, the elastic modulus data is difficult to be measured by a test means, so that even after the strain value is measured by directly attaching the strain gauge to the interface between the part and the mold, the data of the interface stress is difficult to be obtained.
The invention has at least the following beneficial effects:
1. the invention skillfully monitors the interaction between the die and the composite material part by utilizing the strain gauge and the data acquisition sheet which are rigidly connected and other parts, and easily measures the interaction force between the die and the part which is difficult to measure originally.
2. The system and the method do not need to measure physical parameters such as the elastic modulus of the composite material, can calculate the interface shear stress according to the parameters such as the elastic modulus of the die material (namely the material used by the data acquisition sheet, such as aluminum material), and have operability.
3. The system and method are applicable to monitoring die-part interaction under all materials of dies (such as aluminum, steel or formed composite materials).
4. The invention realizes the real-time monitoring of the acting strain of the interface of the die and the workpiece and provides a theoretical basis for deeply analyzing the curing deformation of the large-scale composite material member.
Drawings
FIG. 1 is a schematic top view of the system of the present invention.
Fig. 2 is a schematic view of a main view angle structure of a part of the system according to the present invention.
FIG. 3 is a graph showing the results of measuring the strain in the mold-composite article interaction using the system of the present invention.
In the figure, 1-autoclave, 2-thermocouple, 3-autoclave preformed hole, 4-temperature acquisition instrument, 5-strain acquisition display, 6-connecting wire, 7-dynamic strain acquisition instrument, 8-strain gauge wire, 9-strain gauge, 10-data acquisition slice, 11-composite material support plate and 12-composite material finished piece.
Detailed Description
As shown in fig. 1 and fig. 2, the invention provides a system for monitoring interfacial stress between a hot-press curing composite material part and a mold, the system comprises a composite material support plate 11, a composite material part 12 arranged on the support plate and to be subjected to hot-press curing, a data acquisition sheet 10 (aluminum sheet) arranged above the composite material part, and a strain gauge 9 fixedly arranged on the upper surface of the data acquisition sheet, wherein the thickness of the data acquisition sheet 10 is less than or equal to 0.4mm, and the peripheral dimension of the data acquisition sheet is the same as the peripheral dimension of the composite material part or the peripheral dimension difference between the data acquisition sheet and the composite material part is not more than ± 0.5 mm.
The invention also provides a monitoring method for the interface stress between the hot-press cured composite material part and the mould, which comprises the steps of monitoring by using an interface stress monitoring system, wherein the system structure is as described above; after the system is used for detecting the strain data, multiplying the strain data by the elastic modulus data of the material used by the data acquisition sheet to obtain the interface stress of the composite material part and the die.
In the present invention, the object 12 is disposed below the data acquisition sheet 10, the strain gauge is disposed above the data acquisition sheet 10, and there is no stress gradient between above and below the data acquisition sheet 10. The thermocouple 2 is disposed above the data acquisition sheet 10 for detecting the temperature in the vicinity of the strain gauge 9. In the present invention, the data acquisition sheet 10 is the same size or similar to the part 12, and if the data acquisition sheet 10 is significantly smaller than the part, the high pressure in the autoclave will tend to force the data acquisition sheet 10 into the part when the part is in the viscous state. If the data acquisition wafer 10 is significantly larger than the part, the data acquisition wafer 10 may buckle under the high pressure conditions in the autoclave such that its circumference curves down and the middle arches, making the detected stress data inaccurate. Therefore, both cases do not accurately reflect the actual strain at the interface. In the on-line monitoring system of the present invention, it is ensured that neither the workpiece nor the data acquisition sheet 10 is bent during the measurement. The data acquisition sheet 10 can be a flat sheet or a bent sheet with a radian, and in fact most of resin matrix composite material product products subjected to hot pressing curing have a certain radian. The on-line monitoring system of the invention can ensure that: 1) the data acquisition sheet 10 does not bend throughout the curing of the test article so that the values measured by the strain gauge always reflect the true values. 2) The upper and lower stress of the data acquisition sheet 10 is consistent, and the data of the interface stress between the die and the workpiece, which is indirectly measured by the strain gauge, is accurate.
In a specific embodiment, the length of the strain gauge is 5mm, the width of the strain gauge is 3mm, the thickness of the strain gauge is 0.2-0.3 mm, the length of the test piece 12 and the width of the data acquisition sheet 10 are both 200mm and 50mm, the thickness of the data acquisition sheet 10 is 0.25mm, and the thickness of the test piece is about 1 mm. It can be seen from the above description that the shape and size of the test pieces used in the present invention are not the same as those of the conventionally prepared thermocompression-cured composite product.
The results of strain measurements for examining the mold-part interaction during the curing and molding process of resin-based composite materials using the system of the present invention are shown in FIG. 3.
In the present invention, evacuation is a necessary condition for curing the article. The right ordinate strain value in FIG. 3 has a unit of 10-6The positive number indicates tensile strain, and the negative number indicates compressive strain. The figure is divided into five stages of I, II, III, IV and V according to strain.
In the stage I, the uncured glass state (i.e., shaped like plasticine) piece softens during the heating process, and is tightly attached to the data acquisition sheet 10 (aluminum sheet), and the data acquisition sheet 10 also expands and is tightly contacted with the piece when the temperature rises, but the influence is not great. In stage I, the strain is tensile, which indicates that the expansion of the data acquisition sheet (aluminum sheet) is larger than that of the product.
In the stage II, the workpiece is in a viscous state (similar to a liquid state), the influence of the data acquisition sheet (aluminum sheet) on the workpiece is small, and the strain tends to be zero.
In phase III, the initial phase strain state changes greatly. In stage III, the composite material part is transformed from a gel state to a rubber state, and the data acquisition sheet is tightly bonded with the composite material part.
In the IV stage, along with the temperature reduction, an adhesive shearing force is generated between the data acquisition sheet and the composite material workpiece, and the strain change state is the largest;
in the stage V, the data acquisition sheet slides relative to the composite material part, a constant sliding shearing force exists, and the strain is basically constant.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions and substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (10)
1. The monitoring method is characterized by comprising the steps of monitoring by using an interface stress monitoring system, wherein the system comprises a composite material supporting plate (11), a composite material part (12) to be subjected to hot-press curing treatment arranged on the composite material supporting plate, a data acquisition sheet (10) arranged above the composite material part and a strain gauge (9) fixedly arranged on the upper surface of the data acquisition sheet, the thickness of the data acquisition sheet (10) is less than 0.4mm, and the difference between the peripheral size of the data acquisition sheet and the peripheral size of the composite material part is not more than +/-0.5 mm; after the system is used for detecting the strain data, multiplying the strain data by the elastic modulus data of the material used by the data acquisition sheet to obtain the interface stress of the composite material part and the die.
2. The method according to claim 1, wherein the data acquisition sheet is made of a material consistent with a material of a forming die for hot-pressing and curing the resin-based composite material, and the material of the data acquisition sheet is one of aluminum, steel or the cured resin-based composite material.
3. The method according to claim 1, wherein the composite material support plate is made of the same material as the composite material workpiece after being cured, the composite material support plate is smooth and has a roughness Ra of less than or equal to 1.6 μm, and the surface of the composite material support plate is coated with a release agent or release cloth.
4. The method according to claim 1, characterized in that the system comprises a strain acquisition device for online strain measurement, wherein the strain acquisition device comprises the strain gauge (9) and a strain gauge lead (8), a dynamic strain acquisition instrument (7), a connecting wire (6) and a strain acquisition display (5) which are connected in sequence.
5. The method according to claim 1, characterized in that the system further comprises an autoclave, in which the composite support plate (11), the composite object (12), the data acquisition sheet (10) and the strain gauge (9) are arranged.
6. The method of claim 5, further comprising a thermocouple (2) disposed within the autoclave, the thermocouple being disposed above the data acquisition wafer and proximate or proximate to the strain gage.
7. The method of claim 1, wherein the strain gauge is affixed to the data acquisition sheet using a high temperature resistant adhesive.
8. The method of claim 1 wherein the data acquisition sheet has a perimeter dimension that differs from the perimeter dimension of the composite article by no more than ± 0.2 mm.
9. The method according to claim 1, wherein the data acquisition sheet (10) has a thickness of 0.3mm or less.
10. The method according to any one of claims 1 to 9, wherein the thickness of the composite material part to be subjected to the thermosetting treatment provided on the composite material support plate is 0.5mm or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810437824.3A CN109000837B (en) | 2018-05-09 | 2018-05-09 | Method for monitoring interface stress between hot-press curing composite material part and mould |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810437824.3A CN109000837B (en) | 2018-05-09 | 2018-05-09 | Method for monitoring interface stress between hot-press curing composite material part and mould |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109000837A CN109000837A (en) | 2018-12-14 |
| CN109000837B true CN109000837B (en) | 2021-03-23 |
Family
ID=64574114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810437824.3A Active CN109000837B (en) | 2018-05-09 | 2018-05-09 | Method for monitoring interface stress between hot-press curing composite material part and mould |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109000837B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088026B (en) * | 2022-01-20 | 2022-04-05 | 江苏奥琳斯邦装备科技股份有限公司 | Hot-pressing curing device and curing method for strain measurement |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202267429U (en) * | 2011-09-28 | 2012-06-06 | 浙江省交通工程建设集团有限公司 | Tester for vertical expansion ratio of prestressed grouting |
| WO2012095608A2 (en) * | 2011-01-13 | 2012-07-19 | LAVARENNE, Anna | Device for measuring pressure from a flexible, pliable, and/or extensible object made from a textile material comprising a measurement device |
| CN103323154A (en) * | 2013-05-24 | 2013-09-25 | 西安近代化学研究所 | Method for measuring inner stress in pouring explosive solidification process |
| CN104359393A (en) * | 2014-11-28 | 2015-02-18 | 中航电测仪器股份有限公司 | Strain gauge and methods for manufacturing and mounting strain gauge |
| CN105424238A (en) * | 2015-12-08 | 2016-03-23 | 北京金风科创风电设备有限公司 | Stress strain sensor |
| CN105758793A (en) * | 2016-03-07 | 2016-07-13 | 南京航空航天大学 | Curing procedure oriented method for monitoring interfacial force between composite materials and molds |
| CN107084661A (en) * | 2017-05-11 | 2017-08-22 | 中国科学院西安光学精密机械研究所 | A kind of structure glue solidification internal stress test device and method of testing |
| CN107941283A (en) * | 2017-12-22 | 2018-04-20 | 中南大学 | The multi-parameter on-line monitoring system and method for composite material hot-press solidifying process |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4557889A (en) * | 1981-09-26 | 1985-12-10 | Kawasaki Yucoh Co., Ltd. | Method and apparatus for producing sheet molding compound parts by compression |
| JP3299428B2 (en) * | 1995-11-27 | 2002-07-08 | 松下電工株式会社 | Injection molded article molding method and molding die |
| CN201464108U (en) * | 2009-05-15 | 2010-05-12 | 中国电子科技集团公司第十八研究所 | Internal pressure detector for sealed pressure container |
| CN102445470A (en) * | 2011-12-12 | 2012-05-09 | 中国科学院宁波材料技术与工程研究所 | Method and device for monitoring solidification process of resin matrix composite material in real time |
| CN107655449A (en) * | 2017-09-20 | 2018-02-02 | 武汉卡米珈科技有限公司 | For electric power tower bar settlement monitoring device and installation method |
-
2018
- 2018-05-09 CN CN201810437824.3A patent/CN109000837B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012095608A2 (en) * | 2011-01-13 | 2012-07-19 | LAVARENNE, Anna | Device for measuring pressure from a flexible, pliable, and/or extensible object made from a textile material comprising a measurement device |
| CN202267429U (en) * | 2011-09-28 | 2012-06-06 | 浙江省交通工程建设集团有限公司 | Tester for vertical expansion ratio of prestressed grouting |
| CN103323154A (en) * | 2013-05-24 | 2013-09-25 | 西安近代化学研究所 | Method for measuring inner stress in pouring explosive solidification process |
| CN104359393A (en) * | 2014-11-28 | 2015-02-18 | 中航电测仪器股份有限公司 | Strain gauge and methods for manufacturing and mounting strain gauge |
| CN105424238A (en) * | 2015-12-08 | 2016-03-23 | 北京金风科创风电设备有限公司 | Stress strain sensor |
| CN105758793A (en) * | 2016-03-07 | 2016-07-13 | 南京航空航天大学 | Curing procedure oriented method for monitoring interfacial force between composite materials and molds |
| CN107084661A (en) * | 2017-05-11 | 2017-08-22 | 中国科学院西安光学精密机械研究所 | A kind of structure glue solidification internal stress test device and method of testing |
| CN107941283A (en) * | 2017-12-22 | 2018-04-20 | 中南大学 | The multi-parameter on-line monitoring system and method for composite material hot-press solidifying process |
Non-Patent Citations (1)
| Title |
|---|
| 传感器在注塑模具中的应用;陶永亮;《上海塑料》;20110930;第2011年卷(第03期);第22-26页 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109000837A (en) | 2018-12-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6571639B1 (en) | Fiber optic system | |
| KR100402673B1 (en) | Composite structure resin cure monitoring using an optical fiber grating sensor | |
| US5359899A (en) | Method for measuring adhesion strength of resin material | |
| Prussak et al. | Evaluation of residual stress development in FRP-metal hybrids using fiber Bragg grating sensors | |
| CN105588673B (en) | A kind of method of fiber-optic grating sensor monitoring mold and member force | |
| CN104315990B (en) | A kind of test device of polymer matrix composites hot moulding curing deformation and the preparation and application of device | |
| Jensen et al. | Degradation of graphite/bismaleimide laminates with multiple embedded fiber optic sensors | |
| CN109000837B (en) | Method for monitoring interface stress between hot-press curing composite material part and mould | |
| CA3086808C (en) | Method and device for predicting residual stress of metal plate based on measuring of residual stress release warpage | |
| Li et al. | Cure-induced temperature gradient in laminated composite plate: Numerical simulation and experimental measurement | |
| CN208076080U (en) | A kind of hot-press solidifying composite product and mold interface stress monitoring system | |
| CN104807698B (en) | A kind of method of testing of continuous fiber reinforced composites Poisson's ratio | |
| Lawrence et al. | An embedded fiber optic sensor method for determining residual stresses in fiber-reinforced composite materials | |
| CN110988012B (en) | Device for measuring dimensional stability of carbon fiber composite material and evaluation method | |
| EP0472590A1 (en) | System and method for monitoring pressure during the production of fiber reinforced polymers | |
| CN108692846A (en) | A kind of hot-press solidifying composite product and mold interface stress monitoring system | |
| JP3671195B2 (en) | Mold internal stress analysis method and model mold manufacturing method for mold internal stress analysis | |
| JP2016016628A (en) | Resin molding method | |
| JP5685671B1 (en) | Resin molding equipment | |
| Torre-Poza et al. | Challenges of complex monitoring of the curing parameters in coupons for LRI manufacturing | |
| Lee et al. | Constant Poisson’s Ratio of Thermosetting Polymers: Is It Reasonable for Accurate Thermal Stress Analysis? | |
| Osaka et al. | Effects of pressure on measurement of strains in EFPI optical fiber sensors embedded in FRP laminates | |
| Dvorak et al. | Comparison of strain measurement methods: Optical FBG sensors, strain gages & digital image correlation | |
| Maxwell et al. | Measurement of residual stresses and strains in carbon fibre composites. | |
| Kang | A Novel Experimental Approach for Curing Polymer Analysis |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |