A Method for Predicting Fatigue Strength Degradation of Metallic Materials

A technology for metal materials and fatigue strength, which is applied in the direction of applying repetitive force/pulsation force to test material strength, strength characteristics, and analysis of materials. High precision and accurate description of the effect

Active Publication Date: 2022-02-18
SHANGHAI HOOSUN INTELLIGENT TECH CO LTD
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  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of many undetermined coefficients, cumbersome operation, and insufficient precision when describing the strength degradation process in the residual strength degradation model in the prior art, and to provide a method for estimating the fatigue strength degradation of metal materials

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  • A Method for Predicting Fatigue Strength Degradation of Metallic Materials

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Embodiment Construction

[0047] The present invention will be further described below in combination with specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0048] A method for estimating fatigue strength degradation of metal materials, the steps are as follows:

[0049](1) Study the change of the strength degradation coefficient of the same material under different load-stress ratios, incorporate the influence of the load-stress ratio on the remaining strength into the fatigue life and material strength degradation coefficient under the stress ratio, and according to the ch...

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Abstract

The invention relates to a method for estimating the fatigue strength degradation of metal materials. First, the residual strength is determined during the fatigue test process, and then the fatigue strength degradation of the metal material is estimated according to the residual strength; in the early stage of the fatigue test process, the residual strength is obtained by testing ; In the later stage of the fatigue test process, the residual strength is output by inputting the parameters affecting the residual strength degradation into the residual strength degradation model; the expression of the residual strength degradation model is as follows: In the formula, R(n) is n times of fatigue loading Remaining strength of the post-metal material, in MPa; A is the strength degradation coefficient; S max is the maximum value of fatigue load in MPa; σ b is the static tensile strength (the characteristic index of the material), and the unit is MPa; n is the actual number of cycles; N is the limit cycle number, that is, the number of cycles corresponding to the fatigue fracture of the metal material. The method of the invention has less undetermined coefficients, higher precision and simple and quick operation.

Description

technical field [0001] The invention belongs to the technical field of metal materials and relates to a method for estimating fatigue strength degradation of metal materials. Background technique [0002] Under the action of fatigue load, the internal damage of the material continues to increase, and the strength performance of the material continues to deteriorate, resulting in a continuous decline in the ability of the material to resist external loads. This phenomenon can be described by residual strength. Residual strength refers to the ability of the specimen to resist external loads after being used for a period of time. It can be considered that the fatigue failure process is the continuous degradation of the material properties and the continuous reduction of the residual strength of the material under the action of cyclic loading. The process that ultimately leads to static strength failure. Fatigue damage is one of the most important failure modes of engineering m...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G16C60/00G01N3/32
CPCG16C60/00G01N3/32G01N2203/0005G01N2203/0073
Inventor 刘新田喻学广王旭姜长杰
Owner SHANGHAI HOOSUN INTELLIGENT TECH CO LTD
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