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Dynamic Thermal Response of Multiple Interface Cracks between a Half-Plane and a Coating Layer under General
Mahsa Nourazar1, Weilin Yang1, Zengtao Chen1
1Department of Mechanical Engineering, University of Alberta, Edmonton, AB T6G 1H9, Canada.
Materials (Basel, Switzerland)
|June 19, 2024
Summary
This study analyzes thermal stress in coated materials with cracks under transient heat. It quantifies how crack properties and heat conditions affect thermal stress intensity factors for improved material design.
Area of Science:
- Solid Mechanics
- Heat Transfer
- Materials Science
Background:
- Interface cracks in coated materials pose risks under thermal loads.
- Understanding transient thermal behavior is crucial for high-temperature applications.
- Hyperbolic heat conduction offers a more accurate model for rapid thermal changes.
Purpose of the Study:
- To investigate the thermal behavior of multiple interface cracks in a coated half-plane under transient thermal loading.
- To develop a method for calculating temperature gradient intensity factors (TGIFs) for these cracks.
- To analyze the influence of material properties and crack geometry on TGIFs.
Main Methods:
- Modeling cracks as arrays of thermal dislocations.
- Employing Fourier and Laplace transformations for dislocation density calculation.
- Formulating and solving a singular integral equation for crack analysis.
- Utilizing hyperbolic heat conduction theory for temperature distribution.
Main Results:
- Successfully estimated TGIFs for interface cracks under transient thermal conditions.
- Quantified the impact of relaxation time, loading parameters, and crack dimensions on TGIFs.
- Demonstrated the effectiveness of the dislocation-based approach.
Conclusions:
- The developed methodology accurately predicts thermal stress behavior in cracked coatings.
- Results provide critical data for fracture analysis in high-temperature structural components.
- Findings aid in the selection and design of thermal coating materials to mitigate thermal damage.
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