Spherical Indentation Method for Measuring Biaxial Residual Stresses Without Using Stress-Free Sample

The article introduces a novel method for measuring biaxial residual stresses in engineering components using spherical indentation. Traditional methods for measuring residual stresses, such as hole drilling and ring core methods, are destructive, while physical methods like X-ray diffraction have limitations in application. The proposed method addresses these challenges by using a non-destructive instrumented indentation technique. The method is particularly notable for its ability to measure both the magnitude and directions of biaxial residual stresses without the need for a stress-free sample. The authors employ dimensional analysis and finite element simulations to establish correlations between residual stress components and indentation parameters. The method is validated through both numerical simulations and experiments, demonstrating its accuracy and feasibility. This innovative approach has the potential to significantly impact the field of materials science and engineering by providing a more efficient and accurate method for evaluating residual stresses in engineering components.