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Adaptive Finite Element Modeling of Linear Elastic Fatigue Crack Growth
Abdulnaser M Alshoaibi1, Abdullateef H Bashiri1
1Mechanical Engineering Department, Jazan University, P.O. Box 114, Jazan 45142, Saudi Arabia.
Materials (Basel, Switzerland)
|November 11, 2022
Summary
This study presents an efficient 2D fatigue crack growth simulation program for linear elastic materials. The program accurately predicts crack propagation and fatigue life using advanced finite element analysis and established fracture mechanics models.
Area of Science:
- Computational mechanics
- Materials science
- Fracture mechanics
Background:
- Fatigue crack growth simulation is crucial for predicting material failure.
- Accurate estimation of stress intensity factors (SIFs) is essential for crack growth analysis.
- Mixed-mode loading conditions require robust simulation methods.
Purpose of the Study:
- To develop an efficient two-dimensional fatigue crack growth simulation program.
- To implement an incremental crack growth procedure for linear elastic materials.
- To accurately predict crack propagation trajectory and fatigue life.
Main Methods:
- Finite element code developed using Visual Fortran.
- Adaptive finite element mesh generated via the advancing front method.
- Stress intensity factors calculated using the displacement extrapolation technique (DET).
- Crack propagation predicted using maximum circumferential stress theory (MCST) and Paris' law.
Main Results:
- The developed program efficiently simulates 2D fatigue crack growth.
- Accurate SIFs were obtained for mixed-mode loading conditions.
- Crack trajectory and fatigue life predictions were validated through application examples.
Conclusions:
- The proposed program offers an efficient and capable tool for fatigue crack growth simulation.
- The combination of adaptive meshing, DET, MCST, and Paris' law provides reliable predictions.
- The simulation program is suitable for analyzing fatigue behavior in linear elastic materials.
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