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Determination of the Enhancement or Shielding Interaction between Two Parallel Cracks under Fatigue Loading
Zhichao Han1, Caifu Qian2, Lanqing Tang3
1Department of Chemical Mechanics Engineering, Beijing University of Chemical Technology, Beijing 100029, China. hanzhichaohzc@163.com.
Materials (Basel, Switzerland)
|April 27, 2019
Summary
Investigating parallel cracks in 304 stainless steel reveals that their interaction can enhance or shield stress intensity factors. A criterion diagram clarifies these effects based on crack positioning, crucial for material integrity assessments.
Area of Science:
- Materials Science
- Mechanical Engineering
- Fracture Mechanics
Background:
- Understanding crack interactions is vital for predicting material failure.
- Parallel cracks can influence each other's behavior, affecting structural integrity.
- Previous research has not fully elucidated the interaction mechanisms between parallel cracks.
Purpose of the Study:
- To investigate the interactions between two parallel cracks.
- To determine the stress intensity factors and distributions for parallel cracks.
- To establish a criterion for enhancement or shielding effects between parallel cracks.
Main Methods:
- Experimental fatigue crack growth tests on 304 stainless steel specimens.
- Numerical analysis using finite element models.
- Comparison of experimental and numerical results to validate models.
Main Results:
- Numerical models accurately predicted stress intensity factors and distributions.
- Parallel crack interactions exhibit either an enhancement or shielding effect.
- A criterion diagram was developed to predict interaction effects based on crack positions.
Conclusions:
- The relative positions of parallel cracks dictate their interaction effects.
- The study provides a mechanism for understanding and predicting crack interactions.
- Findings are crucial for assessing the durability of materials with multiple cracks.
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