4.1 Transient response of angular stress
The transient response of angular stress with different axial ratios and different ωp in the three cases was analyzed according to the case study. The numerical results were shown in Figs. 14-18. As shown in Figs. 14-16, the spatial distribution of transientαηDSCF was similar to steady-state αηDSCF . TransientαηDSCF always had a maximum value at both ends of the elliptical minor axis, and a minimum value of 0 at both ends of the elliptical major axis. When the shape of inclusion was close to circle and the incident wave was high dominant frequency, the extreme values appeared at other angles. Distribution ofαηDSCF was symmetric about thex -axis and the value ofαηDSCF was affected by