CN111413220A - In-situ measuring device for dynamic fracture stress intensity factor of material in damp and hot environment - Google Patents
In-situ measuring device for dynamic fracture stress intensity factor of material in damp and hot environment Download PDFInfo
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- CN111413220A CN111413220A CN202010370645.XA CN202010370645A CN111413220A CN 111413220 A CN111413220 A CN 111413220A CN 202010370645 A CN202010370645 A CN 202010370645A CN 111413220 A CN111413220 A CN 111413220A
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- intensity factor
- stress intensity
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- 239000000463 material Substances 0.000 title claims abstract description 25
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 12
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000012625 in-situ measurement Methods 0.000 claims description 5
- 230000006399 behavior Effects 0.000 abstract description 4
- 230000000977 initiatory effect Effects 0.000 abstract description 4
- 230000003287 optical effect Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/30—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight
- G01N3/303—Investigating strength properties of solid materials by application of mechanical stress by applying a single impulsive force, e.g. by falling weight generated only by free-falling weight
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/02—Details
- G01N3/06—Special adaptations of indicating or recording means
- G01N3/068—Special adaptations of indicating or recording means with optical indicating or recording means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/001—Impulsive
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0032—Generation of the force using mechanical means
- G01N2203/0039—Hammer or pendulum
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0222—Temperature
- G01N2203/0226—High temperature; Heating means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/022—Environment of the test
- G01N2203/0236—Other environments
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0641—Indicating or recording means; Sensing means using optical, X-ray, ultraviolet, infrared or similar detectors
- G01N2203/0647—Image analysis
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses an in-situ measuring device for a dynamic fracture stress intensity factor of a material in a damp and hot environment, which comprises a damp and hot environment box, wherein a first transparent window and a second transparent window are arranged on the damp and hot environment box; according to the invention, by acquiring the image information of the laser passing through the sample and calculating the stress intensity factor of the material before and after stress based on the principle of optomechanics, the mechanical behaviors such as crack initiation, crack propagation and crack failure of the material in service in a damp and hot environment can be monitored in real time.
Description
Technical Field
The invention relates to an in-situ measuring device for a dynamic fracture stress intensity factor of a material in a damp and hot environment, and belongs to the technical field of material mechanics.
Background
The existing mechanical behavior of the material is that the material is placed in a temperature box to measure the mechanical property under the conventional environment or after moisture absorption saturation, and an in-situ mechanical property measuring device under the damp-heat environment is lacked. Particularly, no report is found on an experimental device which can measure the dynamic fracture performance of the material in a damp and hot environment in situ.
However, quantitative testing and characterization of crack initiation, propagation and failure of materials under dynamic loading is very important for material mechanics design, reliability design and safety service.
Disclosure of Invention
The invention provides an in-situ measuring device for a dynamic fracture stress intensity factor of a material in a damp and hot environment, which is used for overcoming the defect that the dynamic fracture of the material in the damp and hot environment cannot be measured in situ in the prior art.
In order to solve the technical problems, the invention provides the following technical scheme:
the invention discloses an in-situ measuring device for a dynamic fracture stress intensity factor of a material in a damp and hot environment, which comprises a damp and hot environment box, wherein a first transparent window and a second transparent window are arranged on the damp and hot environment box, an environment control system is connected with the damp and hot environment box and used for controlling the environment conditions, the damp and hot environment box is connected with a loading device, the loading control system is connected with the loading device and used for controlling the loading size, a clamp is connected to the center of the damp and hot environment box, a sample is arranged on the clamp, the clamp is connected with the loading device, a laser, a beam expanding lens and a first collimating lens are arranged in front of the damp and hot environment box, a second collimating lens and a high-speed camera are arranged behind the damp and hot environment box, and the loading control system, the environment control system and the.
Furthermore, a transparent window is arranged on the humid and hot environment box.
Further, the loading device comprises a cross beam, a stand column, a base, a slide rail, a support, a pulley, a steel cable, a release mechanism, a drop hammer and a winch.
Furthermore, the loading control system is connected with the loading device to control the loading amount.
Furthermore, the environment control system is connected with the damp and hot environment box to control the temperature and the humidity of the environment.
The invention has the following beneficial effects: according to the method, the in-situ measurement of the dynamic fracture stress intensity factor of the material in the damp and hot environment is established, the stress intensity factor of the material before and after stress is calculated based on the optomechanical principle by collecting the image information of the laser passing through the sample, and further the mechanical behaviors such as crack initiation, crack propagation, crack failure and the like of the material in service in the damp and hot environment can be monitored in real time.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic structural diagram of the loading device of the present invention.
In the figure: 1. a laser; 2. a beam expander; 3. a first collimating mirror; 4. a hot and humid environment chamber; 5. a first transparent window; 6. a sample; 7. a clamp; 8. a loading device; 8-1, a cross beam; 8-2, upright columns; 8-3, a base; 8-4, a slide rail; 8-5, supporting; 8-6, a pulley; 8-7, steel cable; 8-8, a release mechanism; 8-9, drop hammer; 8-10 of winch; 9. loading a control system; 10. a second transparent window; 11. a second collimating mirror; 12. an environmental control system; 13. a high-speed camera; 14. and (4) a computer.
Detailed Description
The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.
Example 1
As shown in fig. 1-2, an in-situ measurement device for a dynamic fracture stress intensity factor of a material in a damp and hot environment comprises a damp and hot environment box 4, wherein a first transparent window 5 and a second transparent window 10 are installed on the damp and hot environment box 4, an environment control system 12 is connected with the damp and hot environment box 4 to control an environment condition, the damp and hot environment box 4 is connected with a loading device 8, a loading control system 9 is connected with the loading device 8 to control a loading size, a clamp 7 is connected to the center of the damp and hot environment box 4, a sample 6 is installed on the clamp 7, the clamp 7 is connected with the loading device 8, a laser 1, a beam expander 2 and a first collimating mirror 3 are arranged in front of the damp and hot environment box 4, a second collimating mirror 11 and a high-speed camera 13 are arranged behind the damp and hot environment box 4, and the loading control system 9, the environment control system 12 and the high-speed camera 13 are.
The loading device 8 comprises a beam 8-1, the beam 8-1 is connected with a base 8-3 through an upright post 8-2, the inner side of the upright post 8-2 is provided with a slide rail 8-4, the outer side is provided with a support 8-5, the beam 8-1 is provided with a pulley 8-6, a steel cable 8-7 is connected with a release mechanism 8-8 and a winch 8-10 through the pulley 8-6, the release mechanism 8-8 is connected with a drop hammer 8-9, the winch 8-10 lifts the release mechanism 8-8 connected with the drop hammer 8-9 to a set height through the pulley 8-6 and the steel cable 8-7, the falling weight 8-9 is released through the releasing mechanism 8-8, the falling weight 8-9 falls along the sliding rail 8-4, and the sample placed on the base 8-3 is loaded.
The working principle is as follows: firstly, after the loading amount, the environmental temperature and the humidity of the in-situ measuring device are adjusted by a loading control system 9 and an environmental control system 12, a laser 1 emits laser, a laser point light source is expanded into a laser surface light source by a beam expanding lens 2, the laser is parallel light after passing through a first collimating lens 3, the parallel light reaches a sample 6 through a first transparent window 5 of a damp and hot environment box 4 with a transparent window, the laser after passing through the sample 6 reaches a second collimating lens 11 through a second transparent window 10 of the damp and hot environment box 4 with the transparent window, and the laser after passing through the second collimating lens 11 is received by a high-speed camera 13. Based on the principle of optomechanics, the geometrical size of the optical image received by the high-speed camera 13 can be calculated by the computer 14 to obtain the fracture stress intensity factor of the material.
The in-situ measuring device receives the optical image through the high-speed camera before loading, receives the deformed optical image through the high-speed camera 13 after loading, and then calculates the size difference of the optical image before and after loading by using a computer to obtain the size of the stress intensity factor. The device can monitor the dynamic crack initiation, expansion, failure and other mechanical behaviors of the material in service in a damp and hot environment in real time.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (4)
1. A material dynamic fracture stress intensity factor in-situ measuring device under a damp and hot environment is characterized by comprising a damp and hot environment box, wherein a first transparent window and a second transparent window are installed on the damp and hot environment box;
the loading device comprises a cross beam, the cross beam and the base are connected through an upright column, a slide rail is arranged on the inner side of the upright column, a support is arranged on the outer side of the upright column, a pulley is arranged on the cross beam, a steel cable is connected with a releasing mechanism and a winch through the pulley, the releasing mechanism is connected with a drop hammer, the winch lifts the releasing mechanism connected with the drop hammer to a set height through the pulley and the steel cable, the drop hammer is released through the releasing mechanism, falls along the slide rail, and samples placed on the base are loaded.
2. The in-situ measurement device for the dynamic fracture stress intensity factor of the material under the damp and hot environment as claimed in claim 1, wherein a transparent window is arranged on the damp and hot environment box.
3. The in-situ measurement device for the dynamic rupture stress intensity factor of the material under the damp and hot environment as claimed in claim 1, wherein the loading control system is connected with the loading device to control the loading amount.
4. The in-situ measurement device for the dynamic rupture stress intensity factor of the material under the damp and hot environment as claimed in claim 1, wherein the environment control system is connected with the damp and hot environment box to control the temperature and humidity of the environment.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010370645.XA CN111413220A (en) | 2020-05-06 | 2020-05-06 | In-situ measuring device for dynamic fracture stress intensity factor of material in damp and hot environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010370645.XA CN111413220A (en) | 2020-05-06 | 2020-05-06 | In-situ measuring device for dynamic fracture stress intensity factor of material in damp and hot environment |
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| Publication Number | Publication Date |
|---|---|
| CN111413220A true CN111413220A (en) | 2020-07-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010370645.XA Pending CN111413220A (en) | 2020-05-06 | 2020-05-06 | In-situ measuring device for dynamic fracture stress intensity factor of material in damp and hot environment |
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| CN (1) | CN111413220A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051261A (en) * | 2020-08-28 | 2020-12-08 | 中国航发北京航空材料研究院 | Ti under high-temperature environment2AlNb material dynamic fracture measuring device |
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| CN1114746A (en) * | 1994-12-01 | 1996-01-10 | 天津大学 | Intelligent interference cloud testing instrument |
| CN1435683A (en) * | 2002-01-29 | 2003-08-13 | 罗至善 | Microcomputerized laser interferometer |
| CN101435811A (en) * | 2008-12-04 | 2009-05-20 | 上海大学 | Aging test method and apparatus under wet, heat and power multiple-field coupling |
| CN102980813A (en) * | 2012-11-30 | 2013-03-20 | 清华大学 | Experimental apparatus and method for measuring poisson ratio of material under high temperature |
| CN103439199A (en) * | 2013-08-19 | 2013-12-11 | 北京航空航天大学 | System for testing fatigue crack propagation in corrosion environment |
| CN103454165A (en) * | 2013-08-19 | 2013-12-18 | 北京航空航天大学 | Testing system for fatigue crack propagation test under high/low temperature environment |
| CN206540782U (en) * | 2017-03-03 | 2017-10-03 | 刘昭阳 | A kind of simple loading experimental apparatus that drops hammer |
| CN109932395A (en) * | 2017-12-15 | 2019-06-25 | 中国矿业大学(北京) | A kind of electrical measurement-caustics the experimental system and method for dynamic fracture-mechanics experiment |
| CN110823713A (en) * | 2019-11-07 | 2020-02-21 | 湘潭大学 | Three-point bending detection device for high-temperature mechanical property of material |
-
2020
- 2020-05-06 CN CN202010370645.XA patent/CN111413220A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1114746A (en) * | 1994-12-01 | 1996-01-10 | 天津大学 | Intelligent interference cloud testing instrument |
| CN1435683A (en) * | 2002-01-29 | 2003-08-13 | 罗至善 | Microcomputerized laser interferometer |
| CN101435811A (en) * | 2008-12-04 | 2009-05-20 | 上海大学 | Aging test method and apparatus under wet, heat and power multiple-field coupling |
| CN102980813A (en) * | 2012-11-30 | 2013-03-20 | 清华大学 | Experimental apparatus and method for measuring poisson ratio of material under high temperature |
| CN103439199A (en) * | 2013-08-19 | 2013-12-11 | 北京航空航天大学 | System for testing fatigue crack propagation in corrosion environment |
| CN103454165A (en) * | 2013-08-19 | 2013-12-18 | 北京航空航天大学 | Testing system for fatigue crack propagation test under high/low temperature environment |
| CN206540782U (en) * | 2017-03-03 | 2017-10-03 | 刘昭阳 | A kind of simple loading experimental apparatus that drops hammer |
| CN109932395A (en) * | 2017-12-15 | 2019-06-25 | 中国矿业大学(北京) | A kind of electrical measurement-caustics the experimental system and method for dynamic fracture-mechanics experiment |
| CN110823713A (en) * | 2019-11-07 | 2020-02-21 | 湘潭大学 | Three-point bending detection device for high-temperature mechanical property of material |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112051261A (en) * | 2020-08-28 | 2020-12-08 | 中国航发北京航空材料研究院 | Ti under high-temperature environment2AlNb material dynamic fracture measuring device |
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Application publication date: 20200714 |