Method for testing mechanical property of metal-based composite material matrix
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A composite material and testing method technology, which is applied in computer materials science, testing material strength using stable tension/pressure, informatics, etc., to achieve the effect of accurate elastic-plastic constitutive equation, comprehensive measurement and high efficiency
Pending Publication Date: 2020-12-01
HEFEI UNIV OF TECH
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[0004] In order to solve the defects of the existing mechanical property method, the present invention provides a method for testing the mechanical property of the metal matrix composite material matrix
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Embodiment 1
[0057] see figure 1 , The method for testing the mechanical properties of the metal matrix composite matrix of the present invention mainly includes the following steps: sample preparation, test, screening, calculation, fitting, and result.
[0058] 1. Sample preparation.
[0059] Provide the composite material to be tested.
[0060] The prepared metal matrix composite can be cut into appropriate sizes to make several samples according to the requirements of the nano-indentation test. Since the surface roughness affects the determination of the final indentation depth, before the test, the sample should be ground and polished as much as possible to make the surface smooth. Grinding can be done by grinding the sample sequentially with 400-mesh, 600-mesh, 800-mesh and 1000-mesh sandpaper.
[0061] Two, test.
[0062] Making multiple nano-indentations on the surface of the composite material to be tested.
[0063] In this embodiment, the composite material to be tested is fi...
Embodiment 2
[0093] In order to better demonstrate the present invention, specific practice is carried out aiming at embodiment 1.
[0094] see Figure 2-4 , in an embodiment of the present invention, a method for testing the mechanical properties of a metal matrix composite material matrix, the specific steps of the method are as follows:
[0095] 1. Sample preparation, according to the requirements of the nano-indentation test, cut the prepared composite material into a suitable size to make several samples. Since the surface roughness affects the determination of the final indentation depth, before the test, the sample needs to be ground, polishing to make the surface smooth;
[0096] 2. Test, fix the sample on the workbench, apply the load and unload the load according to the setting, and make x nano-indentations on the surface of the sample;
[0097] 3. Screening, according to the different depths of nanometers, the nanoindentations punched on the substrate are screened out for calc...
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Abstract
The invention discloses a method for testing the mechanical property of a metal-based composite material matrix. The method comprises the steps of sample preparation, testing, screening, calculation,fitting and result obtaining. A plurality of nanoindentations are punched on the surface of the to-be-detected composite material; and a load-displacement curve for the screened nanoindentations is output to solve equivalent modulus, parameter curvature, rigidity and maximum indentation depth, characteristic stress, characteristic strain, strain strengthening index and stress-strain relationship are calculated according to a dimensionless function to obtain a stress-strain value, and then the stress-strain value is simulated and optimized. And the characteristic stress, the characteristic strain and the strain strengthening index are substituted into an elastic-plastic stress-strain model formula to obtain the mechanical properties of the to-be-tested composite material. The elasticity modulus, the hardness, the stress-strain curve and the elastic-plastic constitutive equation can be obtained only through one-time detection, and compared with traditional stretching and Vickers hardnesstesting, the surface of the sample is not damaged, the efficiency is higher, and measurement is more comprehensive.
Description
technical field [0001] The invention relates to a method for testing the mechanical properties of materials, in particular to a method for testing the mechanical properties of a metal matrix composite material matrix. Background technique [0002] Mechanical properties are an important criterion for material evaluation, and also the basis for processing and design. At present, the measurement of mechanical properties is generally uniaxial tensile test and Vickers hardness test. The uniaxial tensile test can directly obtain the stress-strain curve of the material, but the stress-strain curve obtained is the overall stress-strain curve of the metal matrix composite material, and the mechanical properties of the matrix in the composite material cannot be measured. The Vickers hardness test has low measurement accuracy for composite materials and has certain damage to the surface of the sample. Therefore, for the measurement of the mechanical properties of the composite materi...
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