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Test method of material mesoscopic mechanics

A testing method and mechanical technology, applied in the direction of analyzing materials, measuring devices, scientific instruments, etc., can solve the problems of not synchronously recording the sample strain amount, unable to obtain material stress-strain information and deformation screw field, etc.

Active Publication Date: 2008-12-03
GUOBIAO BEIJING TESTING & CERTIFICATION CO LTD
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Problems solved by technology

Since the displacement extensometer is not installed, the strain caused by the loading of the sample is not recorded simultaneously, and the real stress-strain information and deformation spin field of the material cannot be obtained.

Method used

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  • Test method of material mesoscopic mechanics
  • Test method of material mesoscopic mechanics

Examples

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Embodiment Construction

[0020] Specimen design and preparation: Specimen cross-sections can be square or rectangular; gripping ends can be of any shape to fit the test machine support; machined notched or pre-cracked tensile specimens can be used , the maximum stress at the notch can be obtained from the nominal stress and the stress concentration factor K T Estimated by the product; you can refer to the sample specified in the tensile test in GB / T228;

[0021] Testing machine loading system: the test adopts a tension and pressure bidirectional loading closed-loop experimental system, and the transmission form is coaxial transmission; the loading form is tension, compression and bending; the force value measurement range is 0-2500N, which can be graded; the test speed has no Step variable speed, speed range 0.01-20mm / min; force value measurement accuracy is ±1%, each gear accuracy reaches ±1%,

[0022] Stress and strain measurement and data acquisition system: The electrical signal is sensed and out...

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Abstract

The invention relates to a method for testing mesoscopic mechanics of materials and belongs to the material testing field. The method comprises the following steps: a sample is clamped on a loading stage; the surface of the sampler is disposed below an inspection glass; a clamp-type displacement extensometer is installed on the sample; a computer collects and stores stress and strain dada in the testing process; mesoscopic images are collected in the deformation process; the images are analyzed and generalized. The method is conducive to analyzing and researching the mesoscopic behavior in the deformation and fracture process of materials, and provides a novel testing method for the research on metal.

Description

technical field [0001] The invention belongs to the field of material testing technical background [0002] At present, Russia has done some work in the direction of mesoscopic mechanics testing. Since the displacement extensometer is not installed and the strain caused by the loading of the sample is not recorded synchronously, the real stress-strain information and deformation spin field of the material cannot be obtained. Contents of the invention [0003] The purpose of the present invention is to study and test the mesoscopic substructure and the corresponding stress-strain behavior of metal material deformation, plastic flow and cracking on the mesoscopic scale. The stress-strain data, the mesoscopic dynamic morphology image, and the strain equivalent field and deformation spinor field in the analysis field of view corresponding to each moment are obtained by measurement. [0004] The test steps of the present invention are as follows [0005] a The sample is clam...

Claims

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Application Information

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IPC IPC(8): G01N3/00
Inventor 朱其芳孙泽明张金波王福生
Owner GUOBIAO BEIJING TESTING & CERTIFICATION CO LTD
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