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Damage Cycle Counting Method for Nonlinear Structural Parts and Its Fatigue Life Analysis Method

A technology of structural parts and counting method, applied in the field of non-linear structural parts damage cycle counting method and fatigue life analysis, can solve the problems of unpredictable fatigue life, limited use range of nonlinear structural parts, etc. The effect of high efficiency and high computational efficiency

Active Publication Date: 2018-08-17
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the problem that the fatigue life of existing nonlinear structural parts cannot be predicted under multi-axis random loads, resulting in limited use range of nonlinear structural parts, the present invention provides a damage cycle counting method for nonlinear structural parts and its fatigue life analysis method, which can Accurately predict the fatigue life of nonlinear structural parts under multi-axial random loads, with high analysis efficiency and high precision, which removes obstacles for the design and use of nonlinear structural parts and is conducive to the popularization and use of nonlinear structural parts

Method used

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  • Damage Cycle Counting Method for Nonlinear Structural Parts and Its Fatigue Life Analysis Method
  • Damage Cycle Counting Method for Nonlinear Structural Parts and Its Fatigue Life Analysis Method
  • Damage Cycle Counting Method for Nonlinear Structural Parts and Its Fatigue Life Analysis Method

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Embodiment 1

[0037] In this embodiment, damage cycle counting is performed on a rubber part under the action of two-axis load.

[0038] A method for counting damage cycles of rubber parts, including the following steps:

[0039] 1) Collect the two-axis random load received by the rubber part in use, and establish as figure 1 A two-axis random load spectrum is shown. The x-direction load and the y-direction load vary with time. If a rubber part is subjected to the two-axis random load, fatigue failure may occur. In order to calculate the load of the rubber component Life under the spectrum, the load spectrum needs to be decomposed;

[0040] 2 pairs figure 1 The load spectrum shown is sampled point by point, and the load at the same time is combined into the total load, which is marked as a load space vector containing direction and magnitude;

[0041] 3) Such as figure 2 As shown, the two-dimensional coordinate system is established, the load space vector in step 2) is merged into several directio...

Embodiment 2

[0049] A method for counting damage cycles of rubber parts, which is the same as Example 1, except that:

[0050] In step 3), a two-dimensional coordinate system is established, and the space coordinate system of the vector is divided at certain intervals. In this embodiment, the space is divided into 36 regions at 10 degree intervals, and the vectors falling on the regions are merged into the dividing line according to the principle of proximity In the above, the load spectrum is sampled point by point, and a series of points are obtained on the dividing line. The points on the same dividing line form a new unidirectional load spectrum according to time; for example, the point formed at the 0 degree dividing line The load spectrum in the direction of 0 degrees, the point of the 30-degree dividing line forms the load spectrum in the direction of 30 degrees; so far, a two-dimensional random load spectrum is split into the load spectrum in 18 directions (the positive and negative di...

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Abstract

The invention discloses a nonlinear structural part damage cyclic counting method and a nonlinear structural part fatigue life analysis method, and belongs to the field of part fatigue life analysis, for solving the problem of incapability of predicting fatigue life of a conventional nonlinear structural part under the condition of a multi-axis random load. The cyclic counting method comprises the following steps: 1, acquiring the multi-axis random load and establishing a load spectrum; 2, sampling the load spectrum point by point to form a load space vector including directions and sizes; 3, establishing a space coordinate system, incorporating the load space vector in the second step to a plurality of directions spaced at equal angles, and in each direction, according to a time sequence of vectors, forming a single-axis load spectrum in the direction; 4, calculating main strain or main stress under the single-axis load spectrum in the third step; 5, forming a strain spectrum or a stress spectrum; and 6, performing cyclic counting on the strain spectrum or the stress spectrum in the fifth step. According to the invention, the fatigue life of the nonlinear structural part under the multi-axis random load can be accurately predicted, and the analysis efficiency is high.

Description

Technical field [0001] The invention belongs to the field of component fatigue life analysis, and specifically relates to a non-linear structural component damage cycle counting method and a fatigue life analysis method thereof. Background technique [0002] Non-linear structural parts such as rubber isolators or seals bear complex loads in actual working conditions. The loads are generally multi-axial variable amplitude random loads. Under such alternating loads, the rubber parts are prone to fatigue damage , Affect its use, and have a great impact on the entire system using this rubber component. There have been many proposals for cycle counting of metal materials. The most commonly used is the rain flow counting method, which can handle uniaxial load or multi-axis proportional load; Wang-Brown method is a more commonly used multi-axis random spectrum load counting method. The fatigue load spectrum of metal materials has been applied to certain extent. Due to the different dam...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M13/00
CPCG01M13/00
Inventor 魏志刚王全先周莉萍
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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