Jong-hyoung Kim, Kyungyul Lee, Dongil Kwon, Gary S. Schajer
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Evaluation of Non-equi-biaxial Residual Stresses from the Surface Displacements Around a Single Indentation
This study presents a novel model for evaluating non-equi-biaxial surface residual stresses in metals using surface in-plane displacements around an indentation, as an alternative to the commonly used instrumented force-depth curve. The surface X- and Y-displacements are measured within an annular region around the indentation imprint by Digital Image Correlation with random patterns generated from surface scratches. Integration of these displacements allows for evaluating principal residual stress magnitudes and directions by comparing the results from stressed and stress-free specimens. The effects of stress state and material property were investigated within a series of finite element simulations, and an alternative way was developed to eliminate the need for stress-free specimens. Experimental validation was conducted on specimens with known non-equi-biaxial stress states.
期刊介绍：
Metals and Materials International publishes original papers and occasional critical reviews on all aspects of research and technology in materials engineering: physical metallurgy, materials science, and processing of metals and other materials. Emphasis is placed on those aspects of the science of materials that are concerned with the relationships among the processing, structure and properties (mechanical, chemical, electrical, electrochemical, magnetic and optical) of materials. Aspects of processing include the melting, casting, and fabrication with the thermodynamics, kinetics and modeling.
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