Ultrasonic fatigue crack propagation rate measurement method based on inherent frequency

A technology of fatigue crack propagation and natural frequency, which is used in the analysis of solids, instruments, and materials using sonic/ultrasonic/infrasonic waves. Strong, easy-to-collect effects

Active Publication Date: 2020-09-18
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In view of the above-mentioned deficiencies in the prior art, the measurement method of the ultrasonic fatigue crack growth rate based on the natural frequency provided by the present invention solves the problem of inaccurate crack measurement and the inability to measure the crack rate in the prior art

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  • Ultrasonic fatigue crack propagation rate measurement method based on inherent frequency
  • Ultrasonic fatigue crack propagation rate measurement method based on inherent frequency
  • Ultrasonic fatigue crack propagation rate measurement method based on inherent frequency

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Embodiment Construction

[0033] The specific embodiments of the present invention are described below so that those skilled in the art can understand the present invention, but it should be clear that the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes Within the spirit and scope of the present invention defined and determined by the appended claims, these changes are obvious, and all inventions and creations using the concept of the present invention are included in the protection list.

[0034] Embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0035] Such as figure 1 As shown, a method for measuring the ultrasonic fatigue crack growth rate based on the natural frequency includes the following steps:

[0036] S1. Conduct an ultrasonic fatigue test on the sample material, and collect the natural frequency of the ultrasonic fatigue test in ...

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Abstract

The invention discloses an ultrasonic fatigue crack propagation rate measurement method based on the inherent frequency. The method specifically comprises the following steps: carrying out an ultrasonic fatigue test on a sample material, and acquiring the inherent frequency of the ultrasonic fatigue test in real time; analyzing the fracture of the sample material to obtain a fatigue crack source position of the sample material and obtain a crack source type of the sample material; obtaining a relation formula between the fatigue crack length and the inherent frequency by adopting a finite element analysis method; according to the inherent frequency and a relation formula, obtaining the length of the fatigue crack and the unit length of crack propagation every week; obtaining the maximum stress intensity factor value of the crack tip through the fatigue crack length and the crack source type; and obtaining the ultrasonic fatigue crack propagation rate through the maximum stress intensity factor value of the crack tip and the unit length of crack propagation every week. The relation formula between the fatigue crack length and the inherent frequency is obtained through the finite element analysis method, the crack length can be accurately obtained, and the accuracy of crack propagation rate measurement is guaranteed.

Description

technical field [0001] The invention relates to the technical field of ultrasonic fatigue testing of materials, in particular to a method for measuring the rate of ultrasonic fatigue crack growth based on natural frequencies. Background technique [0002] The ultra-high cycle fatigue research of materials is the basic guarantee for the safe service of national major projects and equipment such as aerospace aircraft, automobiles, ocean platforms, and rail transit. Ultrasonic vibration accelerated fatigue test technology is the most direct and effective way to carry out ultra-high cycle fatigue research. However, its loading principle at resonance converts the vibration displacement into stress, which is applied to the sample through the amplification device, and the loading frequency reaches 20kHz. However, the ultrasonic fatigue test can only obtain the life corresponding to the loading stress, and the key mechanical information such as stress and strain during the loading p...

Claims

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Application Information

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IPC IPC(8): G01N29/12
CPCG01N29/12G01N2291/014
Inventor 何超王清远刘永杰李雪李浪张宏王宠
Owner SICHUAN UNIV
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