固体における結晶粒界散乱を考慮した超音波伝搬有限要素解析手法の開発(<小特集>高精度な新非破壊検査技術)

概要

論文の詳細を見る
With the demand of high accuracy of defection and sizing in ultrasonic testing, numerical modeling of wave propagation needs to consider the scattering of waves among the boundaries of crystal grains. In this paper, a method is developed for automatically generating grain boundaries in finite element models. The properties of received signals in intensity and frequency spectrum by simulations are compared with those by experiments. They are in excellent agreement. This model is also applied to the numerical analysis of the wave propagation under longitudinal angle beam testing for solids with various average grain diameters. Numerical results show that a diffracted longitudinal wave can be easily measured in the case where the average grain diameter is smaller than 80μm, but it is diffcult to identify the diffracted longitudinal wave when the average grain diameter is larger than 150μm because the diffracted waves are probably masked by the scattering waves on the grain boundaries. Moreover, numerical results also show that the crystal grain model developed in this paper provides an effective way to model wave propagation quantitatively.
一般社団法人日本機械学会の論文
2006-12-25