A critical plane-energy model for multiaxial fatigue life prediction

2017 ◽  
Vol 40 (12) ◽  
pp. 1973-1983 ◽  
Author(s):  
H. Wei ◽  
Y. Liu
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Energy Model ◽  
Multiaxial Fatigue ◽  
Fatigue Life Prediction ◽  
Critical Plane

Fatigue Life Prediction Strategies for High-Heat-Load Components

2010 ◽  
Vol 452-453 ◽  
pp. 789-792
Author(s):  
W.L. Xiao ◽  
H.B. Chen ◽  
J.F. Jin
Keyword(s):  
Fatigue Life ◽  
Heat Load ◽  
Life Prediction ◽  
High Heat ◽  
Multiaxial Fatigue ◽  
Fatigue Life Prediction ◽  
Critical Plane ◽  
Critical Plane Approach ◽  
High Heat Load ◽  
Strain Model

High-heat-load components such as photon shutters and masks made of Glidcop Al-15 are subjected to intense thermal cycles from the X-ray beams at the third generation light sources. This paper presents thermal fatigue life prediction results of high-heat-load components at the beam line front end of Shanghai Synchrotron Radiation Facility (SSRF) under different power conditions. Used in this analysis are four typical multiaxial fatigue life prediction models, i.e. the maximum principal strain model, equivalent vonMises strain model, maximum shear strain model and critical plane approach. Detailed comparisons among them were implemented from various aspects including applicable conditions, physical meanings and resultant veracities. Critical plane approach was finally determined to be more appropriate method for dealing with multiaxial fatigue of high-heat-load components. To obtain the multiaxial stress-strain fields, nonlinear finite element analysis (FEA) was performed with commercial software ANSYS.

Multiaxial Fatigue Life Prediction of Metallic Materials Based on Critical Plane Method under Non-Proportional Loading

2017 ◽  
Vol 730 ◽  
pp. 516-520 ◽  
Author(s):  
Er Nian Zhao ◽  
Wei Lian Qu
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Multiaxial Fatigue ◽  
Fatigue Life Prediction ◽  
Metallic Materials ◽  
Loading Conditions ◽  
Critical Plane ◽  
Proportional Loading ◽  
Plane Method ◽  
Strain Paths

The critical plane method is widely discussed because of its effectiveness for predicting the multiaxial fatigue life prediction of metallic materials under the non-proportional loading conditions. The aim of the present paper is to give a comparison of the applicability of the critical plane methods on multiaxial fatigue life prediction. A total of 205 multiaxial fatigue test data of nine kinds of metallic materials under various strain paths are adopted for the experimental verification. Results shows that the von Mises effective strain parameter and KBM critical plane parameter can give well predicted fatigue lives for multiaxial proportional loading conditions, but give poor prediction lives evaluation for multiaxial non-proportional loading conditions. However, FS parameter shows better accuracy than the KBM parameter for multiaxial fatigue prediction for both proportional and non-proportional loading conditions.

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