Crack initiation life test machine for elastic materials and using method thereof
A technology for life testing and elastic materials, which is applied in the direction of analyzing materials, applying stable tension/pressure to test the strength and strength characteristics of materials, etc., and can solve problems such as limited number of samples, difficult crack growth process, and cracks that cannot be accurately determined. Achieve the effect of accurate fatigue life times, accurate results and high test efficiency
Active Publication Date: 2015-11-18
WUHU LION AUTOMOTIVE TECH CO LTD
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Problems solved by technology
[0005] (1) The number of samples measured at one time by the MTS test system is relatively limited, and it is not easy to directly observe the crack growth process
And the crack initiation cannot be accurately determined during the detection process;
[0006] (2) It is difficult to measure the strain and identify the crack initiation by using the Democia type testing machine
Method used
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[0051] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.
[0052] see figure 1 , which shows a crack initiation life testing machine 100 for elastic materials according to an embodiment of the present invention. The crack initiation life tester 100 includes a fatigue tester (not shown) and an optical measurement device 10 . The fatigue testing machine is used to carry out the fatigue test on the test sample 11; the optical measuring device 10 is configured to monitor the crack growth of the test sample 11 in the fatigue test, and obtain the test data and the crack growth based on the test data and the crack growth during the fatigue test. Stress-fatigue life curves and crack initiation life of samples.
[0053] Such as figure 2 As shown, the crack initiation life testing machine 100 also inc...
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The invention discloses a crack initiation life test machine for elastic materials, and belongs to the field of automotive engineering. The crack initiation life test machine comprises a fatigue testing machine and an optical measuring device, wherein the fatigue testing machine is used for carrying out fatigue tests on test samples; the optical measuring device is arranged for monitoring the crack propagation conditions of the test samples in the fatigue tests, and obtaining the stress-fatigue life curve graphs and the crack initiation life of the test samples based on the test data and crack propagation conditions during the fatigue test process. According to the crack initiation life test machine for elastic materials and the using method thereof provided by the invention, fatigue loading can be carried out on a plurality of test samples at a time, and the testing efficiency is high; fatigue loading strain of non-contact optical measurement samples is used during the test process, so that the result is more accurate; a camera device is adopted to monitor the appearance of cracks in real time, so that the fatigue life can be more accurately recorded; sample change caused by stress softening and hysteresis during the test process can be detected without machine halt.
Description
technical field [0001] The invention relates to the field of automobile engineering, in particular to a crack initiation life testing machine for elastic materials and a method for using the same. Background technique [0002] Material destruction is a process. The failure process begins with the appearance of internal defects in the material, followed by cracks and gradual expansion until the structure of the material is completely broken. The stage from the appearance of cracks to visible tiny cracks is called the initiation stage of cracks; the stage from visible cracks to complete destruction of the structure is the crack propagation stage; the complete fracture of cracks makes the material fracture and fail, which makes people pay more and more attention to it. Material life issues. [0003] In recent years, the theory of crack initiation has become increasingly mature and widely used in industry, making accurate prediction of crack initiation life an important issue....
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IPC IPC(8): G01N3/06G01N3/08
Inventor 魏志刚陈效华
Owner WUHU LION AUTOMOTIVE TECH CO LTD