CN111964568A - Method for testing micro deformation of sandwich structure or core under compression load - Google Patents
Method for testing micro deformation of sandwich structure or core under compression load Download PDFInfo
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- CN111964568A CN111964568A CN202010727258.7A CN202010727258A CN111964568A CN 111964568 A CN111964568 A CN 111964568A CN 202010727258 A CN202010727258 A CN 202010727258A CN 111964568 A CN111964568 A CN 111964568A
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- deformation
- pressing plate
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- pressure plate
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/30—Measuring arrangements characterised by the use of mechanical techniques for measuring the deformation in a solid, e.g. mechanical strain gauge
Abstract
The invention belongs to the technical field of aviation composite material detection, and discloses a method for testing micro-deformation of an interlayer structure or a core under a compressive load, which comprises the steps of using a strain gauge, an upper pressure plate and a lower pressure plate, firstly placing an object to be tested between the upper pressure plate and the lower pressure plate, connecting the upper pressure plate with an upper pressure head of a testing machine, and placing the lower pressure plate on a ball support; then, four connecting claws are respectively connected with the left side and the right side of the upper pressing plate and the left side and the right side of the lower pressing plate, one strain gauge is respectively connected with the end heads of the connecting claws at the left side of the upper pressing plate and the lower pressing plate, the other strain gauge is respectively connected with the end heads of the connecting claws at the right side of the upper pressing plate and the lower pressing plate, and the two strain gauges are connected with an upper computer; and finally, the upper computer starts the testing machine, the pressure head on the testing machine applies specified pressure to the upper pressure plate, and the two strain gauges measure the deformation value of the object to be tested and send the deformation value to the upper computer. The method can effectively test the micro-deformation of the sandwich structure or the core under the compression load, and improves the test precision and the test efficiency.
Description
Technical Field
The invention belongs to the technical field of aviation composite material detection, relates to a method for detecting micro deformation of an aviation composite material product, and particularly relates to a method for testing micro deformation of an interlayer structure or a core under a compression load.
Background
Aeronautical composite products, such as sandwich structures or cores, honeycomb structures, require compression testing to determine the properties of the material or structure by testing the deformation degree of the aeronautical composite product under a certain load force.
The current scheme for testing the micro deformation of the sandwich structure or the core under the compressive load is GB/T1453 'test method for the flat-pressing performance of the sandwich structure or the core', and the method uses dial gauges fixed on an upper pressure plate and a lower pressure plate to test the compressive deformation. In the method, the sandwich structure or the core in the middle is pressed and clamped by the upper clamping plate and the lower clamping plate, and then the compression deformation of the sandwich structure or the core is measured by a dial indicator.
However, the method has insufficient automation degree, and the dial indicator is fixedly connected in an installation mode and is inconvenient to adjust.
Disclosure of Invention
In order to solve the above problems, the present invention provides a method of testing the micro-deformation of a sandwich structure or core under a compressive load using a strain gauge to determine the micro-deformation of the sandwich structure or core under a compressive load.
The technical scheme of the invention is as follows:
a method for testing micro deformation of a sandwich structure or a core under a compressive load by using a strain gauge, an upper pressure plate and a lower pressure plate comprises the following steps:
placing an object to be tested between an upper pressure plate and a lower pressure plate, wherein the upper pressure plate is connected with an upper pressure head of a testing machine, and the lower pressure plate is placed on a ball support;
connecting the left side and the right side of the upper pressing plate and the left side and the right side of the lower pressing plate respectively by using four connecting claws, connecting one strain gauge with the end heads of the connecting claws on the left side of the upper pressing plate and the lower pressing plate respectively, connecting the other strain gauge with the end heads of the connecting claws on the right side of the upper pressing plate and the lower pressing plate respectively, and connecting the two strain gauges with an upper computer;
and step three, the upper computer starts the testing machine, the pressure head on the testing machine applies specified pressure to the upper pressure plate, and the two strain gauges measure the deformation value of the object to be tested and send the deformation value to the upper computer.
Furthermore, in the third step, the deformation value of the object to be measured is the average value of the measured values of the two strain gauges. Taking the average value as the actual deformation value can obtain relatively more accurate data.
Furthermore, one end of the connecting claw is of a double-head clamp-shaped structure and is clamped at the side end part of the upper pressing plate or the lower pressing plate.
Furthermore, the other end of the connecting claw is of a return-shaped hole structure and is connected with the strain gauge.
Furthermore, the left side and the right side of the upper pressing plate and the lower pressing plate are provided with grooves which are matched with the double-head clamp-shaped structure of the connecting claw. Ensuring the relative stability of the strain gauge during the test.
Furthermore, the grooves on the left side and the right side of the upper pressing plate and the lower pressing plate are provided with a plurality of grooves. The clamping position can be adjusted according to the test requirement.
Further, the upper computer further comprises test software, the test software comprises a function of inputting the pressure of the testing machine and a function of inputting the area of the object to be tested, and after the pressure of the testing machine is input in the test software of the upper computer, the upper computer controls the testing machine to apply accurate pressure according to the input pressure of the testing machine.
Further, the test software calculates the unit strength of the object to be tested according to the specified pressure applied by the testing machine, the deformation value of the object to be tested and the area of the object to be tested.
The invention has the advantages that:
1. the test method can effectively test the micro-deformation of the sandwich structure or the core under the compression load, and improves the test precision and the test efficiency;
2. the micro-deformation is obtained by calculating the average value of the deformation measured by the two strain gauges, and the influence of the test result caused by the unparallel of the pressure plate is eliminated.
Drawings
FIG. 1 is a schematic diagram of the experimental principle and apparatus;
wherein, 1-upper pressure head, 2-upper pressure plate, 3-lower pressure plate, 4-spherical support, 5-strainometer, 6-connection claw.
Detailed Description
This section is an example of the present invention and is provided to explain and illustrate the technical solutions of the present invention.
A method for testing micro deformation of a sandwich structure or a core under a compressive load by using a strain gauge, an upper pressure plate and a lower pressure plate comprises the following steps:
placing an object to be tested between an upper pressing plate 2 and a lower pressing plate 3, wherein the upper pressing plate 2 is connected with an upper pressing head 1 of a testing machine, and the lower pressing plate 3 is placed on a ball support 4;
secondly, four connecting claws 5 are respectively connected with the left side and the right side of the upper pressing plate 2 and the left side and the right side of the lower pressing plate 3, one strain gauge 5 is respectively connected with the ends of the connecting claws 6 at the left sides of the upper pressing plate 2 and the lower pressing plate 3, the other strain gauge 5 is respectively connected with the ends of the connecting claws 6 at the right sides of the upper pressing plate 2 and the lower pressing plate 3, and the two strain gauges 5 are connected with an upper computer;
and step three, the upper computer starts the testing machine, the upper pressure head 1 of the testing machine applies specified pressure to the upper pressure plate 2, and the two strain gauges 5 measure the deformation value of the object to be tested and send the deformation value to the upper computer.
And in the third step, the deformation value of the object to be measured is the average value of the measured values of the two strain gauges. Taking the average value as the actual deformation value can obtain relatively more accurate data.
One end of the connecting claw 6 is a double-head clamp-shaped structure and is clamped at the end part of the side surface of the upper pressing plate 2 or the lower pressing plate 3.
The other end of the connecting claw 6 is of a square hole structure and is connected with the strain gauge 5.
The left and right sides of the upper press plate 2 and the lower press plate 3 are provided with grooves which are matched with the double-head clamp-shaped structures of the connecting claws 6. Ensuring the relative stability of the strain gauge during the test.
The grooves on the left side and the right side of the upper pressing plate and the lower pressing plate are provided with a plurality of grooves. The clamping position can be adjusted according to the test requirement.
The upper computer further comprises test software, the test software comprises a function of inputting the pressure of the testing machine and a function of inputting the area of the object to be tested, and after the pressure of the testing machine is input into the test software of the upper computer, the upper computer controls the testing machine to apply accurate pressure according to the input pressure of the testing machine.
And the test software calculates the unit strength of the object to be tested according to the specified pressure applied by the testing machine, the deformation value of the object to be tested and the area of the object to be tested.
Another embodiment of the present invention is described below with reference to the drawings.
The structure of the device used by the invention is shown in figure 1, a sandwich structure or a core to be tested is arranged between an upper pressure plate 2 and a lower pressure plate 3, the upper pressure plate 2 is connected with an upper pressure head 1 of a testing machine, and the lower pressure plate 3 is arranged on a spherical support 4; one ends of the four connecting claws 6 are connected with the end parts of the upper and lower pressing plates, and the other ends are provided with return holes for connecting with the two strain gauges 5. And averaging the two strain gauges 5 to obtain test data.
1. Connecting claws of which the front and rear sides are connected with the upper and lower pressure plates and a strain gauge to measure micro-deformation;
2. and calculating the average value of the deformation of the two strain gauges to obtain the micro deformation of the sandwich structure or the core under the compression load.
The test piece is arranged between the upper pressure plate and the lower pressure plate, one end of each of the four connecting claws is connected with the end parts of the upper pressure plate and the lower pressure plate, and the other end of each of the four connecting claws is provided with a return hole to be connected with the two strain gauges. The strain gauge may collect the amount of deformation of the sandwich structure or core through the coupling jaws when a compressive load is applied.
Claims (8)
1. A method for testing micro-deformation of a sandwich structure or a core under a compressive load is characterized in that a strain gauge, an upper pressure plate and a lower pressure plate are used, and the method comprises the following steps:
placing an object to be tested between an upper pressure plate and a lower pressure plate, wherein the upper pressure plate is connected with an upper pressure head of a testing machine, and the lower pressure plate is placed on a ball support;
connecting the left side and the right side of the upper pressing plate and the left side and the right side of the lower pressing plate respectively by using four connecting claws, connecting one strain gauge with the end heads of the connecting claws on the left side of the upper pressing plate and the lower pressing plate respectively, connecting the other strain gauge with the end heads of the connecting claws on the right side of the upper pressing plate and the lower pressing plate respectively, and connecting the two strain gauges with an upper computer;
and step three, the upper computer starts the testing machine, the pressure head on the testing machine applies specified pressure to the upper pressure plate, and the two strain gauges measure the deformation value of the object to be tested and send the deformation value to the upper computer.
2. The method of claim 1, wherein the deformation of the test object is averaged over two strain gauge measurements in step three.
3. A method of testing micro-deformation of a sandwich structure or core under a compressive load according to claim 1 wherein the fingers are of a double ended clamp configuration at one end thereof and clamp onto the side end of the upper or lower platen.
4. A method of testing the micro-deformation of a sandwich structure or core under a compressive load according to claim 3, wherein the other end of the connecting jaw is a hole-shaped structure connected to the strain gauge.
5. A method of testing micro-deformation of a sandwich structure or core under a compressive load according to claim 3, wherein the upper and lower press plates are provided with grooves on left and right sides for engaging the jaw double-headed clamp structure.
6. The method of claim 5, wherein the grooves are formed in a plurality of rows on the left and right sides of the upper platen and the lower platen.
7. The method according to claim 1, wherein the upper computer further comprises test software, the test software comprises a function of inputting the pressure of the testing machine and a function of inputting the area of the object to be tested, and after the test software of the upper computer inputs the pressure of the testing machine, the upper computer controls the testing machine to apply accurate pressure according to the input pressure of the testing machine.
8. The method of claim 7, wherein the test software calculates the unit strength of the test object according to the specified pressure applied by the tester, the deformation value of the test object and the area of the test object.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010727258.7A CN111964568A (en) | 2020-07-24 | 2020-07-24 | Method for testing micro deformation of sandwich structure or core under compression load |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010727258.7A CN111964568A (en) | 2020-07-24 | 2020-07-24 | Method for testing micro deformation of sandwich structure or core under compression load |
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| CN111964568A true CN111964568A (en) | 2020-11-20 |
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| CN202010727258.7A Pending CN111964568A (en) | 2020-07-24 | 2020-07-24 | Method for testing micro deformation of sandwich structure or core under compression load |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983509A (en) * | 2014-05-29 | 2014-08-13 | 金陵科技学院 | Stress entire curve testing device and method |
| CN205027605U (en) * | 2015-07-23 | 2016-02-10 | 王立明 | Rock unipolar compression test device under stress, temperature and vibration coupling |
| CN106525590A (en) * | 2016-12-14 | 2017-03-22 | 武汉科技大学 | Static deformation experiment device for testing low-strength test piece |
| CN206208642U (en) * | 2016-11-22 | 2017-05-31 | 河海大学 | A kind of simulated seawater Environmental Concrete resistance to compression loading device |
-
2020
- 2020-07-24 CN CN202010727258.7A patent/CN111964568A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103983509A (en) * | 2014-05-29 | 2014-08-13 | 金陵科技学院 | Stress entire curve testing device and method |
| CN205027605U (en) * | 2015-07-23 | 2016-02-10 | 王立明 | Rock unipolar compression test device under stress, temperature and vibration coupling |
| CN206208642U (en) * | 2016-11-22 | 2017-05-31 | 河海大学 | A kind of simulated seawater Environmental Concrete resistance to compression loading device |
| CN106525590A (en) * | 2016-12-14 | 2017-03-22 | 武汉科技大学 | Static deformation experiment device for testing low-strength test piece |
Non-Patent Citations (1)
| Title |
|---|
| 周祝林 等: "GB/T1453-2—5夹层结构或芯子平压性能试验方法", 《中国标准网》 * |
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Application publication date: 20201120 |
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