The effect of non-zero initial displacement value on displacement jump and wave form based on the cubic nonlinear spring interface model

The effect of non-zero initial displacement value ondisplacement jump and wave form based on the cubic nonlinear spring interface model between two semi-infinite plates is studied. The wave forms of reflected and transmitted pulses are sensitive to the initial value. The phenonmenon for non-zero initial displacement valueis much different from the counterpart for zero initial displacement value.First, the displacement jump is larger in the case of linear spring than that of nonlinear spring, but the displacement jump goes across the curve for linear spring with the initial displacement value increasing. Second, when the initial displacement value is not zero, for reflected pulse, the curve for nonlinear spring interface is on the top of the curve for linear spring interface, but for transmitted wave, the curve for linear spring interface is on the top of the curve for nonlinear spring interface. This is opposite for zero initial displacement. The initial displacement value plays a great role in elastic wave reflecting. The results in this paper will be of help to nondestructive evaluation of the interface.