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Visual evaluation method for fatigue life of material subjected to laser peening strengthening treatment

A technology of laser shot peening and fatigue life, applied in the field of machinery, to achieve the effect of improving evaluation efficiency, intuitive scheme and easy judgment

Active Publication Date: 2021-02-05
NANTONG UNIVERSITY
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Problems solved by technology

[0004] The purpose of the present invention is to provide an intuitive evaluation method of fatigue life of materials after laser shot peening treatment, so as to solve the defects or problems raised in the background technology

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  • Visual evaluation method for fatigue life of material subjected to laser peening strengthening treatment
  • Visual evaluation method for fatigue life of material subjected to laser peening strengthening treatment
  • Visual evaluation method for fatigue life of material subjected to laser peening strengthening treatment

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Embodiment Construction

[0023] In order to make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will describe in detail with reference to the drawings and specific embodiments.

[0024] In this embodiment, an intuitive evaluation method for fatigue life of engineering materials during service based on laser peening surface microplastic deformation mainly includes the following steps, such as figure 1 Shown:

[0025] 1. Establish a library file. The target material used in this embodiment is TC4 titanium alloy, and the sample is processed. The specific size of the sample is as follows: figure 2 As shown, its basic parameters: elastic modulus E=112.5GPa, elastic wave velocity c0=5.09km / s, TC4 titanium alloy density ρ0=4.5×10 3 kg / m 3 , the dynamic yield strength σ of the alloy material Y =1.34GPa, laser shot peening is performed on the sample after processing, and the laser power density used is 3.02GW / cm 2 , the pulse width i...

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Abstract

The invention discloses a visual evaluation method for fatigue life of a material subjected to laser peening strengthening treatment in a service process, which comprises the following steps of: S1, establishing a library file in which a corresponding relationship among surface micro-plastic deformation at different stages, residual stress and surface roughness is recorded; s2, during the serviceperiod of the engineering structure material, detecting the micro-plastic morphology of the engineering structure surface through a surface morphology instrument or other surface detection means, andevaluating the residual stress and roughness at different service stages based on the library file; s3, calculating crack propagation rates of different stages according to the crack propagation ratemodel (a) after laser shot blasting treatment in combination with evaluation results of residual stress and roughness; and S4, evaluating the fatigue life of the material according to the crack propagation rates of different stages. The method has the advantages of being visual in judgment, easy to judge and capable of effectively improving the reliability evaluation efficiency, and meets the high-requirement standard of engineering structure parts.

Description

technical field [0001] The invention belongs to the field of machinery, and in particular relates to an intuitive evaluation method for the fatigue life of materials after laser shot peening treatment during service. Background technique [0002] As a new surface modification technology, laser shot peening has the advantages of high loading pressure, deep influence of plastic deformation, controllable impact area and loading pressure parameters, and easy automation. It has achieved great achievements in the field of surface modification and strengthening of engineering structural materials. partially applied. However, due to the complex working environment of engineering equipment, the surface quality of laser shot peening is in the process of dynamic change, and the fatigue life of structural materials after laser shot peening changes with time. Stability and fatigue life are tracked and predicted, and the current evaluation of the fatigue life of materials after laser sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/20G06F119/04G06F119/14
CPCG06F30/20G06F2119/04G06F2119/14
Inventor 苏波泳花国然王恒曹宇鹏姚兴田施卫东
Owner NANTONG UNIVERSITY
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