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Nonlinear structural part damage cyclic counting method and nonlinear structural part fatigue life analysis method

A technology of structural parts and counting method, which is applied in the field of nonlinear structural parts damage cycle counting method and fatigue life analysis field, can solve the problems of limited use range of nonlinear structural parts and unpredictable fatigue life, etc. Efficient and accurate results

Active Publication Date: 2016-07-20
ANHUI UNIVERSITY OF TECHNOLOGY
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  • 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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  • Nonlinear structural part damage cyclic counting method and nonlinear structural part fatigue life analysis method
  • Nonlinear structural part damage cyclic counting method and nonlinear structural part fatigue life analysis method
  • Nonlinear structural part damage cyclic counting method and nonlinear structural part fatigue life analysis method

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Embodiment 1

[0037] In this embodiment, damage cycle counting is performed on a rubber part under biaxial load.

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

[0039] 1) Collect the biaxial random loads of rubber parts in use, and establish as figure 1 A two-axis random load spectrum is shown. The x-direction load and the y-direction load change with time. If a rubber part is subjected to this two-axis random load, fatigue damage may occur. To calculate the rubber component under this load The life under 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 moment is synthesized into a total load, which is marked as a load space vector including direction and magnitude;

[0041] 3) if figure 2As shown, a two-dimensional coordinate system is established, and the load space vectors in step 2) are merged into several directions with equal angular intervals...

Embodiment 2

[0049] A method for counting cycles of damage to rubber parts is the same as in 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 by a certain interval. In this embodiment, the space is divided into 36 areas by 10 degree intervals, and the vectors falling on the area are merged into the dividing line according to the nearest principle. Above, the load spectrum is sampled point by point, and a series of points are obtained on the dividing line, and the points on the same dividing line form a new one-way load spectrum according to time; for example, the points on the 0 degree dividing line form The load spectrum in the 0-degree direction, and the points of the 30-degree dividing line form the load spectrum in the 30-degree direction; so far, a two-dimensional random load spectrum is split into load spectra in 18 directions (the positive and negative dividing lines are in a stra...

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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 fatigue life analysis of parts, and in particular relates to a damage cycle counting method of nonlinear structural parts and a fatigue life analysis method thereof. Background technique [0002] Non-linear structural parts such as rubber vibration isolators or sealers are subjected to complex loads in actual working conditions. The loads are generally multi-axis variable amplitude random loads. Under such alternating loads, rubber parts are prone to fatigue damage , affect its use, and have a great impact on the entire system using the rubber component. Many cycle counting methods for metal materials have been proposed. The most commonly used method is the rainflow counting method, which can handle uniaxial loads or multi-axial proportional loads; the Wang-Brown method is a commonly used multi-axial random spectrum load counting method. The processing of the fatigue load spectrum of metal materials has been appli...

Claims

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Application Information

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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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