Fatigue life prediction method and device based on weighted average maximum shear stress plane

A technology of fatigue life prediction and shear stress, which is used in measuring devices, using stable shear force to test the strength of materials, and testing of mechanical parts, etc. Effect

Active Publication Date: 2021-09-21
TSINGHUA UNIV +1
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Among them, the method of determining the critical surface under multi-axis variable amplitude load is a key issue, and there is no good solution for the above problems

Method used

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  • Fatigue life prediction method and device based on weighted average maximum shear stress plane
  • Fatigue life prediction method and device based on weighted average maximum shear stress plane
  • Fatigue life prediction method and device based on weighted average maximum shear stress plane

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Embodiment Construction

[0066] Embodiments of the high cycle multiaxial fatigue life prediction method based on the weighted average maximum shear stress plane according to the present invention will be described below with reference to the accompanying drawings. Those skilled in the art would recognize that the described embodiments can be modified in various ways or combinations thereof without departing from the spirit and scope of the invention. Accordingly, the drawings and description are illustrative in nature and not intended to limit the scope of the claims. Also, in this specification, the drawings are not drawn to scale, and like reference numerals denote like parts.

[0067] The high-cycle multiaxial fatigue life prediction method based on the weighted average maximum shear stress plane includes the following steps:

[0068] Step 1): Obtain the load history of the notched parts, such as Figure 2a Shown, F N is the loaded axial force, M T For loading to torque, the load history of the...

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Abstract

The invention provides a fatigue life prediction method and device based on the weighted average maximum shear stress plane, which relates to the field of multiaxial fatigue strength theory. The method includes: (1) passing the multiaxial variable amplitude load history through the von Mises equivalent stress formula The equivalent stress history is synthesized, and the von Mises equivalent stress history is counted by Wang‑Brown multiaxial cycle counting method; (2) The weighted average maximum shear stress plane is used as the high cycle multiaxial variable amplitude load. critical surface; (3) Calculate the fatigue damage parameters on the critical surface of each repetition obtained by counting; (4) use the Zhang-Shang model to calculate the fatigue damage; (5) use Miner’s linear accumulation rule to calculate the The damage is accumulated, and finally the fatigue life is calculated. The weighting function proposed in this method can take into account the main fatigue damage mechanisms under multiaxial loading. The life prediction results show that the life prediction method can better predict the fatigue life under multi-axis constant amplitude and variable amplitude loading.

Description

technical field [0001] The invention relates to the field of multiaxial fatigue strength theory, in particular to a fatigue life prediction method and device based on a weighted average maximum shear stress plane. Background technique [0002] The lithography machine is the core equipment for manufacturing large-scale integrated circuits. The electromechanical system of the lithography machine contains a large number of components, and many components are subjected to complex multi-axis random loads during operation. Under the action of multi-axial random loads, mechanical parts will experience sudden fatigue fracture after a period of operation, resulting in huge economic and property losses. The traditional uniaxial fatigue strength theory can no longer meet the design requirements of strength and fatigue life of actual engineering components. Therefore, in recent years, more attention has been paid to multiaxial fatigue research that is more in line with engineering reali...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N3/24G01M13/00G06F17/15
CPCG01M13/00G01N3/24G06F17/15
Inventor 王磊杰朱煜陶志强成荣李鑫张鸣
Owner TSINGHUA UNIV
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