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In this research, a technique has been developed for quantitatively evaluating the amount and distribution of tensile and compressive residual stresses by using combined strain measurements under the spherical indentation loading together with the finite element method (FEM). When the spherical indentation is applied to the top surface of a steel plate, the elastic strain at an optimized position near the indentation is measured by strain gauges, where the residual stresses and applied indentation stresses are largely superimposed. In order to analyze the residual stress, FEM analysis has been conducted to establish the relationship between the elastic strain adjacent to the indentation and the indentation load for steel plates subjected to various uniformed tensile and compressive bending stresses, also it has employed using the physical property values appeared in different substrates in accordance with Young’s modulus and yield strength. A strain energy term (U*) has been newly introduced by integrating along the trajectory between the indentation load and elastic strain in a range from 0 to the maximum load. We have obtained the certain relationship between a strain energy term (U*) and residual stress in influence of physical property values which is expected to contribute for enhancing reliability verification of steel parts.

nihon kikai gakkai ronbunshū. a

The Influence of the Substrate Physical Properties, Determined with the Technique for the Residual Stress Evaluation Based on the Surface Strain Measurement Induced by the Spherical Indentation