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TECHNICAL PAPERS

An Approach for Fatigue Life Prediction

[+] Author and Article Information
Yanyao Jiang1

Department of Mechanical Engineering (312),  University of Nevada, Reno, NV 89557yjiang@unr.edu

Fei Ding

Department of Mechanical Engineering (312),  University of Nevada, Reno, NV 89557

Miaolin Feng

School of Civil Engineering and Mechanics,  Shanghai Jiao Tong University, Shanghai 200030, China

1

Corresponding author.

J. Eng. Mater. Technol 129(2), 182-189 (Nov 09, 2005) (8 pages) doi:10.1115/1.2400260 History: Received March 18, 2005; Revised November 09, 2005

Fatigue process is described as the nucleation and growth of cracks to final failure. These two stages are generally modeled with completely different methods with no quantitative relationships between them. A number of fitting parameters are needed to consider different effects. The current work is aimed at developing a robust approach to predicting fatigue life from crack initiation to final fracture. Fatigue damage is related to the stresses and strains. Both crack nucleation and crack growth are governed by the same fatigue damage mechanisms and a single fatigue damage criterion can model both stages. A basic rule is that any material point fails to form a fresh crack if the total accumulated fatigue damage reaches a limit. The approach consists of two steps. Elastic-plastic stress analysis is conducted to obtain the detailed stress-strain responses. A general fatigue criterion is used to predict both fatigue crack nucleation and growth. Notched specimens made of 1070 steel were experimentally tested from crack initiation until fracture. The approach was applied to predict the fatigue life of 1070 steel and the predicted fatigue lives were in excellent agreement with the experimental observations.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Round compact specimen with notch details (all dimensions in mm)

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Figure 2

Finite element mesh model

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Figure 3

Numerical integration

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Figure 4

Stress-strain response for crack tip and notch root

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Figure 5

Notch influencing zone (NIZ)

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Figure 6

Distribution of ΔDi along the x direction for specimen 1

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Figure 7

Distribution of fatigue damage per loading cycle near crack tip

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Figure 8

Comparison of predicted crack growth rate with experimental observation

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Figure 9

Comparison of predicted a‐N relationship and experimental observation. (a) Specimens 1–3, 9–10. (b) Specimens 4–8.

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Figure 10

Comparison of experimental crack “initiation” life (a=0.5mm) and predicted result

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