An integrated CAE system for dynamic stress and fatigue life prediction of mechanical systems

KSME Journal ◽  
1996 ◽  
Vol 10 (2) ◽  
pp. 158-168 ◽  
Author(s):  
Hong Jae Yim ◽  
Sang Beom Lee
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Dynamic Stress ◽  
Mechanical Systems ◽  
Fatigue Life Prediction ◽  
Cae System

Integrated Computational Durability Analysis

1993 ◽  
Vol 115 (4) ◽  
pp. 492-499 ◽  
Author(s):  
W. K. Baek ◽  
R. I. Stephens ◽  
B. Dopker
Keyword(s):  
Finite Element ◽  
Fatigue Life ◽  
Life Prediction ◽  
Dynamic Stress ◽  
Local Strain ◽  
Fatigue Life Prediction ◽  
Dynamic Loads ◽  
Finite Element Stress Analysis ◽  
Multibody Dynamic ◽  
Crack Initiation Life

A computer aided analysis method is described for durability assessment in the early design stages using multibody dynamic analysis, finite element stress analysis, and fatigue life prediction methods. From multibody dynamic analysis of a mechanical system, dynamic loads of a mechanical component were calculated. Finite element stress analysis with substructuring techniques produced accurate stress fields for the component. From the dynamic loads and the stress field of the component, a dynamic stress history at the critical location was produced using the superposition principle. Using Neuber’s rule, a local strain time history was produced from the dynamic stress history. The local strain based fatigue life prediction method was then used to predict “crack initiation” life of the critical component. The predicted fatigue crack initiation life was verified by experimental durability tests. This methodology can be combined with identification of weak links and optimization techniques such that the design optimization for an entire mechanical system based upon durability is possible during the early product development stage.

Dynamic Stress Analysis Method and Its Application for Urethane Wheels Using the Computer Model

2006 ◽  
Vol 321-323 ◽  
pp. 1601-1604
Author(s):  
Kab Jin Jun ◽  
Ji Won Yoon ◽  
Tae Won Park ◽  
Joong Kyung Park
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Dynamic Stress ◽  
Fatigue Life Prediction ◽  
Design Stage ◽  
Analysis Method ◽  
Early Design Stage ◽  
Multibody Dynamic ◽  
Dynamic Stress Analysis ◽  
Damage Rule

An Over Head Transportation (OHT) vehicle is used to transport large loads in a factory more efficiently. To maximize productivity, the speed and load requirement for the OHT vehicle is continually increasing. This may create a repetitive dynamic load and thus cause fatigue failure in related components. In this paper, a computer aided engineering (CAE) method is proposed for fatigue life prediction in the early design stage using multibody dynamic analysis and the linear damage rule. The process of predicting the fatigue life using the proposed computer models in this paper may be applied to structures of various mechanical systems.

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