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Method for determining minimum number of times of rapid fatigue test

A technology of fatigue test and number of times, which is applied in the direction of applying repetitive force/pulsation force to test the strength of materials, measuring devices, instruments, etc., which can solve problems such as unsafety and poor precision, and achieve the effect of saving time and cost

Pending Publication Date: 2020-09-22
FAW JIEFANG AUTOMOTIVE CO
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Problems solved by technology

This is where the Miner theory is unreasonable, and it is also the root cause of its inherent flaws (poor accuracy and serious insecurity)

Method used

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  • Method for determining minimum number of times of rapid fatigue test

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specific Embodiment approach

[0029] In order to clearly and completely describe the technical solution of the present invention and its specific working process, in conjunction with the accompanying drawings, the specific implementation of the present invention is as follows:

[0030] This example discloses a method for determining the minimum number of rapid fatigue tests, such as figure 1 , figure 2 As shown, the specific process of the method for determining the minimum number of rapid fatigue tests is as follows:

[0031] S1: Determine the reliability target R (R≥50%) of the component under the specified life;

[0032] In this step S1, the reliability target R of the component is determined during the component product design stage. The calculated minimum number of rapid fatigue tests is to ensure that: after passing the number of bench tests, if the product reliability verification result R1≥R, then the corresponding reliability R2≥R at the specified life of the product.

[0033] In this example,...

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Abstract

The invention provides a method for determining the minimum number of times of a rapid fatigue test. The method specifically comprises the steps of 1, determining the reliability R of a part under thespecified service life; selecting a logarithm value lg(sigma) of the load sigma and a logarithm value lg(NR) of the fatigue life NR with the corresponding reliability R, forming a double logarithm straight line between the logarithm value lg(sigma) of the load sigma and the logarithm value lg(NR) of the fatigue life NR, and converting the load spectrum into the total equivalent cycle number of the single-stage load of the maximum-stage load, namely, the minimum number of times of the rapid fatigue test. The minimum number of times of the rapid fatigue test obtained by the method does not needto be multiplied by a multiple t like the number of times of fatigue calculated according to the current theory, and t is an empirical value obtained by long-term exploration and can be used as the minimum number of times of the rapid fatigue test. Therefore, for parts made of novel materials, the time cost spent on long-term exploration for obtaining t is greatly saved.

Description

technical field [0001] The invention belongs to the technical field of fatigue reliability tests, is applicable to the fatigue tests of metal material parts on automobiles and other machines, and specifically relates to a method for determining the minimum times of rapid fatigue tests. Background technique [0002] The core content of the Miner theory, which is dominant in the field of fatigue, is: to measure the damage degree of load cycles at all levels in the load spectrum by the median life of each level of load (reliability R=50%), and the sum of the damage degrees is the The cumulative damage of the load spectrum, when the cumulative damage is equal to 1, the component will fail. [0003] According to the above theory, the load spectrum under the actual working conditions of the components (the load spectrum corresponds to a certain life, which can be expressed by working time, mileage, etc., hereinafter referred to as: specified life), and the loads of all levels othe...

Claims

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Application Information

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IPC IPC(8): G01N3/32
CPCG01N3/32G01N2203/0005G01N2203/0073
Inventor 王文阁
Owner FAW JIEFANG AUTOMOTIVE CO
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