CN111735717A - Smooth aluminum sheath bending performance test system and test method thereof - Google Patents
Smooth aluminum sheath bending performance test system and test method thereof Download PDFInfo
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- CN111735717A CN111735717A CN202010570449.7A CN202010570449A CN111735717A CN 111735717 A CN111735717 A CN 111735717A CN 202010570449 A CN202010570449 A CN 202010570449A CN 111735717 A CN111735717 A CN 111735717A
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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
- G01N3/20—Investigating strength properties of solid materials by application of mechanical stress by applying steady bending forces
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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
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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
- G01N3/066—Special adaptations of indicating or recording means with electrical 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
- G01N2203/0003—Steady
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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
- G01N2203/0014—Type of force applied
- G01N2203/0023—Bending
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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
- G01N2203/0617—Electrical or magnetic indicating, recording or sensing means
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present disclosure discloses a smooth aluminum sheath bending performance test system, including: the device comprises a test bed, a bearing seat, a universal testing machine and a measuring unit; the bearing block is arranged on the test bed and used for horizontally fixing the smooth aluminum sheath; the universal testing machine is positioned on one side opposite to the test bed and is used for applying different loads to the smooth aluminum sheath; the measuring unit is used for measuring strain values of the smooth aluminum sheath after different loads are applied on line. The method has the advantages of simple design and convenience in operation, can be used for measuring the bending property of the aluminum pipe with a larger diameter, and provides a more reliable reference basis for judging the bending property of the aluminum pipe.
Description
Technical Field
The disclosure belongs to the field of cable detection, and particularly relates to a system and a method for testing bending performance of a smooth aluminum sheath.
Background
The cable is one of core devices of a power system, and with factors such as shortage of urban land, power construction requirements and the like, the urban power transmission line is changed from an overhead line to an underground cable. The aluminum sheath is used as the outermost layer of the power cable and can play a role in corrosion prevention and insulation to the ground. The use of an aluminum jacket reduces the weight of the cable compared to other metal jackets, thereby simplifying installation and reducing transportation costs. Furthermore, by reducing the cable weight, a longer pull length can be achieved. At present, a corrugated aluminum sheath is widely used in China, but compared with the corrugated aluminum sheath, a smooth aluminum sheath has the advantages of easiness in manufacturing, easiness in wiping the surface, good heat dissipation, strong current transmission capacity and the like, so that the study on whether the mechanical property of the smooth aluminum sheath meets the national standard is very important. Among them, the bending test is a test for measuring mechanical properties of a material when the material is subjected to a bending load, and is one of basic methods for a mechanical property test of a material, and is capable of measuring bending strength of brittle and low plastic materials (such as cast iron, high carbon steel, tool steel, etc.) and reflecting deflection of a plastic index.
Disclosure of Invention
The purpose of the present disclosure is to provide a bending performance testing system for a smooth aluminum sheath, which can measure the mechanical characteristics of the smooth aluminum sheath when the smooth aluminum sheath bears the bending load, so as to analyze the bending performance of the smooth aluminum sheath.
In order to achieve the above purpose, the present disclosure provides the following technical solutions:
a smooth aluminum sheath bend performance testing system, comprising: the device comprises a test bed, a bearing seat, a universal testing machine and a measuring unit; wherein the content of the first and second substances,
the bearing block is arranged on the test bed and used for horizontally fixing the smooth aluminum sheath;
the universal testing machine is positioned on one side opposite to the test bed and is used for applying different loads to the smooth aluminum sheath;
the measuring unit is used for measuring strain values of the smooth aluminum sheath after different loads are applied on line.
Preferably, the measuring unit comprises strain gauges and a static strain testing device, and the strain gauges are uniformly distributed on the surface of the smooth aluminum sheath; the static strain testing device is connected with the strain gauge through a lead.
Preferably, the system further comprises a load table for counterbalancing the system.
Preferably, the system further comprises a dynamic signal acquisition and analysis device for analyzing the strain value measured by the measurement unit.
Preferably, the bearing seat horizontally fixes the smooth aluminum sheath in a single-arm cantilever beam mode.
Preferably, the test bed is formed by welding angle steel.
The present disclosure also provides a method for testing bending performance of a smooth aluminum sheath, comprising the following steps:
s100: horizontally fixing the smooth aluminum sheath in a single-arm cantilever beam mode;
s200: applying different loads to the smooth aluminum sheath;
s300: measuring strain values of each point on the smooth aluminum sheath when different loads are applied and displacement values of the universal testing machine;
s400: and constructing a bending curve of the smooth aluminum sheath according to different loads and strain values and displacement values corresponding to the different loads.
Preferably, the bending curves include a displacement-load curve and a strain-load curve.
Compared with the prior art, the beneficial effect that this disclosure brought does:
1. the test bed is formed by welding angle steels, compared with the traditional heavy test bed, the test bed is simpler to process and transport, and the cost of the test bed is far lower than that of test beds in other modes, so that the test bed embodies simplicity and economy.
2. The invention applies load through the universal testing machine, compared with the traditional point type loading method, the continuous loading can be realized, and the change condition of the strain along with the load in the continuous loading process can be more clearly seen.
3. Compared with the traditional test bed, the invention can improve the stability of the platform through external counterweight and greatly improve the counterweight efficiency by counterweight through the counterweight of the loading platform.
4. The upper surface of the pressure head is a plane, so that the aluminum pipe can be stressed more uniformly and the reliability of the test is ensured compared with the method of directly applying a load on the aluminum pipe.
Drawings
FIG. 1 is a schematic structural diagram of a system for testing bending performance of a smooth aluminum sheath according to an embodiment of the present disclosure;
FIG. 2 is a schematic view of a pressure head structure of the universal testing machine provided by one embodiment of the present disclosure;
FIG. 3 is a schematic structural diagram of a test stand provided in an embodiment of the present disclosure;
FIG. 4 is a schematic structural diagram of a test stand provided in another embodiment of the present disclosure;
FIG. 5 is a schematic view of a displacement-load curve provided by one embodiment of the present disclosure;
FIG. 6 is a schematic diagram of a strain-load curve provided by one embodiment of the present disclosure;
the reference numerals are explained below:
1. a test bed; 2. a bearing seat; 3. a universal testing machine; 4. a measuring unit.
Detailed Description
Specific embodiments of the present disclosure will be described in detail below with reference to fig. 1 to 6. While specific embodiments of the disclosure are shown in the drawings, it should be understood that the disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
It should be noted that certain terms are used throughout the description and claims to refer to particular components. As one skilled in the art will appreciate, various names may be used to refer to a component. This specification and claims do not intend to distinguish between components that differ in name but not function. In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. The description which follows is a preferred embodiment of the invention, but is made for the purpose of illustrating the general principles of the invention and not for the purpose of limiting the scope of the invention. The scope of the present disclosure is to be determined by the terms of the appended claims.
To facilitate an understanding of the embodiments of the present disclosure, the following detailed description is to be considered in conjunction with the accompanying drawings, and the drawings are not to be construed as limiting the embodiments of the present disclosure.
In one embodiment, as shown in fig. 1, a system for testing bending performance of a smooth aluminum sheath comprises: the device comprises a test bed, a bearing seat, a universal testing machine and a measuring unit; wherein the content of the first and second substances,
the bearing block is arranged on the test bed and used for horizontally fixing the smooth aluminum sheath;
the universal testing machine is positioned on one side opposite to the test bed and is used for applying different loads to the smooth aluminum sheath;
the measuring unit is used for measuring strain values of the smooth aluminum sheath after different loads are applied on line.
The embodiment forms a complete technical scheme of the present disclosure, the technical scheme is simple in design and convenient to operate, can measure the bending property of the aluminum pipe with a large diameter, and provides a more reliable reference basis for the bending property evaluation of the aluminum pipe.
In another embodiment, the measuring unit comprises strain gauges and a static strain testing device, wherein the strain gauges are uniformly distributed on the surface of the smooth aluminum sheath; the static strain testing device is connected with the strain gauge through a lead.
In another embodiment, the system further comprises a load table for counterbalancing the system.
In the embodiment, in order to improve the stability and the load bearing capacity of the test bed, the load bearing platform can be formed by the angle steel to balance the system, and the load bearing platform is far away from the test bed, so that the best balance effect can be achieved by the smallest weight.
In another embodiment, the system further comprises a dynamic signal acquisition and analysis device for analyzing the strain value measured by the measurement unit.
In this embodiment, strain and displacement data of each point on the smooth aluminum sheath can be monitored in real time through the dynamic signal acquisition and analysis device, and a corresponding bending curve is constructed according to the monitored data, so that the bending performance of the smooth aluminum sheath can be analyzed.
In another embodiment, the bearing seat horizontally fixes the smooth aluminum sheath in a single-arm cantilever beam mode.
In another embodiment, as shown in fig. 3, the test stand is formed by welding angle steel.
In this embodiment, the test bed is welded together through angle steel, and in order to improve the stability of the test bed, for example, as shown in fig. 4, angle steel 2 and angle steel 3 are used as reinforcing ribs. In order to further improve the load bearing capacity of the test bed, a load bearing platform is formed by angle steel 4, angle steel 5, angle steel 6 and angle steel 7, and a heavy object is arranged on the angle steel 6 and the angle steel 7. The gravity center of the test bed is located near the angle steel 6, and therefore the counterweight efficiency is improved.
In another embodiment, the present disclosure further provides a method for testing bending performance of a smooth aluminum sheath, including the following steps:
s100: horizontally fixing the smooth aluminum sheath in a single-arm cantilever beam mode;
in the step, according to the smooth aluminum sheaths with different sizes, the bearing seats with different models are required to be selected to fix the smooth aluminum sheaths, and compared with the existing method which can only measure the bending performance of the small-size aluminum pipe, the bending performance of the large-size aluminum pipe can be tested by adopting the bearing seats with different models.
S200: applying different loads to the smooth aluminum sheath;
in the step, the other end of the smooth aluminum sheath is positioned below a pressure head of a universal testing machine, and loads of different degrees are applied to the smooth aluminum sheath in a grading or continuous mode through the pressure head. In addition, in order to prevent the smooth aluminum sheath from being flattened during the loading process, the smooth aluminum sheath needs to be filled with sand, and two ends of the smooth aluminum sheath need to be welded by aluminum welding so as to prevent the sand from sliding off during the test.
It should be noted that, in this embodiment, the pressure head of the universal testing machine is improved, as shown in fig. 2, the upper end surface of the pressure head is a plane, and compared with the original arc surface, the pressure head can make the stress on the aluminum pipe more uniform, and ensure the reliability of the test.
S300: measuring strain values of each point on the smooth aluminum sheath when different loads are applied and displacement values of the universal testing machine;
in the step, when the smooth aluminum sheath deforms under stress, the resistance value of the strain gauge distributed on the smooth aluminum sheath changes correspondingly, the strain value of the smooth aluminum sheath can be obtained by measuring the change of the resistance value in the strain gauge, converting the change into the strain value or outputting an electric signal in direct proportion to the strain, and recording the signal by using an analog or digital recording device.
S400: and constructing a bending curve of the smooth aluminum sheath according to different loads and strain values and displacement values corresponding to the different loads.
In this step, strain and displacement data of each point on the smooth aluminum sheath can be monitored in real time through a dynamic signal acquisition and analysis device, and a displacement-load curve as shown in fig. 5 and a strain-load curve as shown in fig. 6 are constructed according to the monitored data.
As shown in FIG. 5, when the load is applied at the beginning, the load value is small, the displacement changes linearly with the load, and the slope of the displacement and the load increases sharply as the load value becomes larger, which indicates that the aluminum pipe is subjected to inelastic deformation under the load, so that the displacement does not increase linearly any more, and therefore, the bending yield strength of the aluminum pipe can be calculated
Wherein M ismaxIs the maximum bending moment, W is the bending surface resistance coefficient, F is the force borne by the aluminum tube, L is the moment arm, D is the inner diameter of the aluminum tube, D is the outer diameter of the aluminum tube,
as shown in FIG. 6, the load value was small at the beginning of the application of the load, the strain linearly varied with the load, and the slopes of the strain and the load sharply increased as the load value became larger, indicating that the aluminum pipe reached the bending yield strength under the load
The foregoing illustrates and describes the principles, principal features and advantages of the present disclosure. It will be understood by those skilled in the art that the present disclosure is not limited to the embodiments described above, which are described in the foregoing description and are intended to illustrate the principles of the invention, and that various changes and modifications may be made to the disclosure without departing from the spirit and scope of the disclosure and within the scope of the invention as claimed. The scope of the disclosure is defined by the appended claims and equivalents thereof.
Claims (8)
1. A smooth aluminum sheath bend performance testing system, comprising: the device comprises a test bed, a bearing seat, a universal testing machine and a measuring unit; wherein the content of the first and second substances,
the bearing block is arranged on the test bed and used for horizontally fixing the smooth aluminum sheath;
the universal testing machine is positioned on one side opposite to the test bed and is used for applying different loads to the smooth aluminum sheath;
the measuring unit is used for measuring strain values of the smooth aluminum sheath after different loads are applied on line.
2. The system of claim 1, wherein preferably, the measuring unit comprises strain gauges and a static strain testing device, wherein the strain gauges are uniformly distributed on the surface of the smooth aluminum sheath; the static strain testing device is connected with the strain gauge through a lead.
3. The system of claim 1, further comprising a load table for weighting the system.
4. The system of claim 1, wherein the system further comprises a dynamic signal acquisition analysis device for analyzing strain values measured by the measurement unit.
5. The system of claim 1, wherein the bearing mount horizontally secures a smooth aluminum sheath by way of a single-armed suspension beam.
6. The system of claim 1, wherein the test stand is welded with angle iron.
7. A method of testing the system of claim 1, comprising the steps of:
s100: horizontally fixing the smooth aluminum sheath in a single-arm cantilever beam mode;
s200: applying different loads to the smooth aluminum sheath;
s300: measuring strain values of each point on the smooth aluminum sheath when different loads are applied and displacement values of the universal testing machine;
s400: and constructing a bending curve of the smooth aluminum sheath according to different loads and strain values and displacement values corresponding to the different loads.
8. The method of claim 7, wherein the bending curves comprise a displacement-load curve and a strain-load curve.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010570449.7A CN111735717A (en) | 2020-06-19 | 2020-06-19 | Smooth aluminum sheath bending performance test system and test method thereof |
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| CN202010570449.7A CN111735717A (en) | 2020-06-19 | 2020-06-19 | Smooth aluminum sheath bending performance test system and test method thereof |
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Application publication date: 20201002 |