無応力下での基準荷重を必要としない圧子押込み法による非等軸残留応力場の準非破壊計測
Semi-nondestructive Measurement of Asymmetric Residual Stress Field using Indentation Technique without Reference Load
著者:
岡野 成威 Shigetaka OKANO 望月 正人 Masahito MOCHIZUKI
発刊日:
公開日:
Asymmetric residual stress fieldIndentation techniqueKnoop indenterSemi-nondestructive stress measurementVickers indenterWeld residual stress
概要
In stress measurement using indentation technique, the value of stress was calculated by the difference in load with and without residual stress. Even in the measurement of asymmetric stress filed using asymmetric indenter such as Knoop indenter, the reference load without residual stress was required for calculating the existing residual stress. However, it takes a lot of work to apply stress measurement of the part with hardness change due to mechanical machining or welding-induced phase transformation, because the reference load with hardening or softening due to machining, welding or some kinds of thermal assisted manufacturing is required. Then in this study, new methodology of semi-nondestructive measurement of asymmetric stress field using indentation technique without reference load was proposed. In the newly developed method, two or three different shapes of indenters such as Knoop and Vickers indenters were used. The developed method were experimentally validated to compared with that measured by X-ray diffraction method.
