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.

A Dynamic Simulation Approach to Machine Component Life Prediction

1988 ◽  
Author(s):  
T. S. Liu ◽  
E. J. Haug ◽  
B. Dopker
Keyword(s):  
Fatigue Life ◽  
Stress Analysis ◽  
Elastic Deformation ◽  
Life Prediction ◽  
Dynamic Stress ◽  
Subsequent Paper ◽  
Simulation Approach ◽  
Analysis Method ◽  
Deformation Method ◽  
Dynamic Stress Analysis

Abstract A system simulation approach is presented for dynamic stress analysis and life prediction of components of machines that undergo nonsteady gross motion and elastic deformation. The method employs finite element structural analysis, coupled gross motion-elastic deformation dynamics, and computer-based fatigue analysis, A computer aided engineering methodology is developed for life prediction by linking together software from dynamics, structures, and fatigue life estimation; to compliment conventional fatigue experiments. Dynamic stress analysis is carried out using either an uncoupled gross motion-elastic deformation method or a more accurate approach that takes into account the coupling between large displacements and elastic deformation. With the aid of vehicle operational scenarios, stress/strain histories at critical regions in vehicle components during a projected service life are simulated. A local strain approach is used to calculate cumulative fatigue damage at notches, which is used in assessing fatigue life of components during the design phase; i.e., prior to availability of experimental data A vehicle example is presented, using a simplified dynamic-stress analysis method. The more general and accurate fully coupled dynamic-stress analysis method will be illustrated in a subsequent paper.

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.

Probabilistic fatigue life prediction for concrete bridges using Bayesian inference

2018 ◽  
Vol 22 (3) ◽  
pp. 765-778 ◽  
Author(s):  
Ming Yuan ◽  
Yun Liu ◽  
Donghuang Yan ◽  
Yongming Liu
Keyword(s):  
Fatigue Life ◽  
Life Prediction ◽  
Concrete Bridges ◽  
Fatigue Life Prediction ◽  
Analysis Method ◽  
Analysis Framework ◽  
Box Girder ◽  
Material Life ◽  
Comparison With Experimental Data ◽  
Life Prediction Model

A probabilistic fatigue life prediction framework for concrete bridges is proposed in this study that considers the stress history from the construction stage to the operation stage. The proposed fatigue analysis framework combines the fatigue crack growth-based material life prediction model and a nonlinear structural analysis method. A reliability analysis is proposed using the developed probabilistic model to consider various uncertainties associated with the fatigue damage. A Bayesian network is established to predict the fatigue life of a concrete bridge according to the proposed framework. The proposed methodology is demonstrated using an experimental example for fatigue life prediction of a concrete box-girder. Comparison with experimental data of fatigue life shows a satisfactory accuracy using the proposed methodology, and the ratio of the posterior predicted mean (updating time n = 8) to the test value decreases to 33%–1% in the current investigation.

A Reinterpretation of the Palmgren-Miner Rule for Fatigue Life Prediction

1980 ◽  
Vol 47 (2) ◽  
pp. 324-328 ◽  
Author(s):  
Z. Hashin
Keyword(s):  
Fatigue Life ◽  
Cyclic Loading ◽  
Life Prediction ◽  
Cumulative Damage ◽  
Fatigue Life Prediction ◽  
Damage Theory ◽  
Special Case ◽  
Damage Rule

It is shown that the simple Palmgren-Miner linear cumulative damage rule is a special case of a general cumulative damage theory previously established. Predictions of lifetimes for families of multistage loadings according to the Palmgren-Miner rule and the general cumulative damage theory are compared with the aim of arriving at qualitative guidelines for applicability of the Palmgren-Miner rule in cyclic loading programs.

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