Notched piece local stress and strain determination method considering multi-axial load non-proportionality

A technology of local stress and determination method, applied in special data processing applications, instruments, electrical digital data processing, etc., can solve problems such as excessive cost, time, infeasibility, etc., to achieve the effect of easy engineering application and good stress and strain

Active Publication Date: 2018-05-01
BEIJING UNIV OF TECH
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Problems solved by technology

Although the methods of experimental measurement and elastic-plastic finite element analysis can obtain reliable local stress-strain, these methods require more cost and time, and these methods are not feasible in practice

Method used

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  • Notched piece local stress and strain determination method considering multi-axial load non-proportionality
  • Notched piece local stress and strain determination method considering multi-axial load non-proportionality
  • Notched piece local stress and strain determination method considering multi-axial load non-proportionality

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Embodiment Construction

[0042] The present invention is illustrated in conjunction with the accompanying drawings.

[0043] The present invention further illustrates the present invention through the fatigue test of the notched test piece, the test is a multi-axis constant-amplitude fatigue test, and the verified material is TC21 titanium alloy.

[0044] A method for determining the local stress and strain of notched parts considering the non-proportionality of multiaxial loads. The specific calculation method is as follows:

[0045] Step 1): Utilize the finite element analysis software (ANSYS) to establish the finite element model of the notched part;

[0046] Step 2): Carry out convergence analysis on the number of meshes of the established notched finite element model;

[0047] Step 3): In the finite element analysis software, apply constraints to one end of the finite element model of the notched part, and apply a load L to the other end b (t), to determine the stress concentration factor (C i...

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Abstract

The invention discloses a notched piece local stress and strain determination method considering multi-axial load non-proportionality and relates to the field of multi-axial fatigue strength theory. According to the method, finite element analysis software is utilized to establish a finite element model of a notched piece; convergence analysis is performed on a mesh number of the finite element model of the notched piece; the finite element analysis software is utilized to calculate a local stress concentration coefficient of a notch under the action of a unit external load, and a virtual stress course of a notch region is calculated; a virtual strain course at the notch is determined through a linear elastic theory or linear elastic finite element analysis; a proposed evaluation method ofnon-proportionality factors is utilized to determine local non-proportionality of the notch under a multi-axial cyclic load; and true stress and true strain at the notch are solved through a notch virtual stress correction method and a constitutive relation. Through the method, local strain of the notch under the multi-axial load can be well predicted.

Description

technical field [0001] The invention relates to the field of multiaxial fatigue strength theory, in particular to a method for determining the local stress and strain of notched parts considering the non-proportionality of multiaxial loads. Background technique [0002] Fatigue fracture is the main cause of failure of many mechanical structures and engineering components, and many mechanical components such as crankshafts, engines, pressure vessels and turbine rotors are subjected to complex multi-axis variable amplitude loads, or complex single-axis, multi-axis ratio, Multi-axis non-proportional interactive cyclic load action. The classic uniaxial fatigue strength theory is far from meeting the design requirements of strength and life of actual engineering components. Therefore, in recent years, the fatigue field has generally paid more attention to the more realistic multiaxial fatigue research. [0003] Many mechanical components contain notches, and fatigue failures oft...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/50
CPCG06F30/17G06F30/23
Inventor 尚德广陶志强刘小冬薛龙李道航赵杰李志高
Owner BEIJING UNIV OF TECH
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