A multiaxial fatigue life prediction method

A fatigue life prediction and fatigue technology, applied in special data processing applications, instruments, electrical and digital data processing, etc., can solve the problem that the comprehensive effect of fatigue life cannot be well reflected.

Inactive Publication Date: 2018-12-11
HUNAN UNIV
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Problems solved by technology

The above model uses different stress and strain combinations to construct fatigue damage parameters, and considers the influence of factors such as load path and additional strengthening on fatigue life, but the stress-strain state on the critical surface varies with the phase angle of the multiaxial load. Different characteristics, the above damage parameters cannot well reflect the comprehensive effect of different stress components on the critical surface under multiaxial loading, so it is necessary to find a damage parameter that can reflect the normal stress and shear stress of the critical surface at the same time Life Prediction of Shaft Fatigue

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  • A multiaxial fatigue life prediction method
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  • A multiaxial fatigue life prediction method

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Embodiment Construction

[0054] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings and experimental verification.

[0055] Such as figure 1 Shown is the flowchart of the multiaxial fatigue life prediction method:

[0056] Step 1: Obtain the strain state of the critical surface or the maximum shear strain plane of the material or structure;

[0057] Step 2: Calculate the stress factor, and correct the multiaxial damage parameters through the stress factor;

[0058] Step 3: Construct a multiaxial fatigue life prediction model based on the state of the critical surface;

[0059] Step 4: Substituting new multiaxial damage parameters into the model for life prediction;

[0060] Specific steps are as follows:

[0061] In step 1: as in figure 2 Thin-walled circular tubing shown, loaded with sinusoidal strain:

[0062]

[0063]

[0064]

[0065] In the formula with are the axial and tangential strain amplitudes, r...

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Abstract

The invention provides a multiaxial fatigue life prediction method, which relates to the field of fatigue strength design. Based on the stress-strain state on the critical surface of the material, a stress factor which can reflect both multiaxiality and non-proportional additional hardening is provided. By introducing this parameter and considering the synergistic effect of normal stress and shearstress on fatigue crack initiation on critical plane, a new fatigue damage parameter is obtained. A new multiaxial fatigue life prediction model is established by utilizing the parameter and combining with a modified Manson-Coffin equation. This model is suitable for uniaxial loading, proportional loading, non-proportional loading and so on.

Description

technical field [0001] The invention relates to a multi-axis fatigue life prediction method, which belongs to the field of fatigue strength design. Background technique [0002] Fatigue problems widely exist in engineering practice, and people pay more and more attention to them. The fatigue design of parts has become an important part of mechanical design. From simple static strength design to fatigue strength design, it reflects people's higher requirements for mechanical service life and reliability. For the vast majority of mechanical parts, due to the complexity of the actual working conditions and the existence of geometric defects, most of the loads they bear during their work are multi-axial loads, and their fatigue problems can be divided into multi-axial fatigue problems. Compared with uniaxial fatigue, the problem of multiaxial fatigue is more complicated, especially the life prediction problem under multiaxial non-proportional loading, and it is difficult to fin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/20G06F30/23G06F2119/04G06F2119/06
Inventor 姜潮王晓钢巫彬
Owner HUNAN UNIV
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