Soundness evaluation for aged structures by a residual stress distribution measurement using grazing SH-wave

使用t型掠射sh波传感器的掠射sh波声弹性方法，即使在材料各向异性等初始值未知的情况下，也可以高精度地测量检测现场的残余应力。本研究将该传感器的掠射sh波声弹性应用于老化钢结构的稳健性评价。利用t型掠射sh波传感器测量表面下的表面各向异性，也可以评估残余应力沿板厚分布的可能性。此外，通过测量表面各向异性得到的非应力声速值不仅可以测量主应力差，还可以测量主应力和。

A grazing SH-wave acoustoelastic method using T-type grazing SH-wave sensor is possible to measure residual stress with high accuracy at inspection site even if initial values, such as material anisotropy, were unknown. In this study, the grazing SH-wave acoustoelasticity using thissensor has been applied to the soundness evaluation for aged steel structures. A possibility that the distribution along board thickness of residual stress could also be evaluated by measuring the surface anisotropy just under the surface using T-type grazing SH-wave sensor was shown. Furthermore, it was demonstrated that not only principal stress difference but also principal stress sum was able to be measured by using the value of the acoustic velocity of non-stress which was estimated by measuring surface anisotropy.