TRANSIENT RESPONSE OF A CRACKED PIEZOELECTRIC STRIP UNDER ARBITRARY ELECTRO:MECHANICAL IMPACT

By using the well-developed integral transform methodology, thedynamic response of stress and electric displacement around a finite crack in an infinitepiezoelectric strip are investigated under arbitrary dynamic anti-plane loads.Thedynamic stress intensity factors and electric displacement are obtained analytically.It is shown that the dynamic crack-tip stress and electric field still have a square-rootsingularity.Numerical computations for the dynamic stress intensity factor show thatthe electric load has a significant influence on the dynamic response of stress field.The higher the ratio of the crack length to the width of the strip, the higher thepeak value of the dynamic stress intensity factor is.On the other hand,the dynamicresponse of the electric field is determined solely by the applied electric load.Theelectric field will promote or retard the propagation of the crack depending on thetime elapse since the application of the external electro-mechanical loads.