Interference Effect in Dynamic Stress Concentration : Effect of Cylindrical Wave on Circular Discontinuities

抄録

The dynamic stress concentration around circular discontinuities in an infinitely extended elastic plate, during passage of a cylindrical dilatation wave of which strength varies harmonically in time, is discussed. When the wave source is apart infinitely from discontinuities, the resulting dynamic stress concentration factor coincides with the result for a plane wave incidence. The influence of the proximity of wave source to discontinuities and the interference effect are studied in detail numerically for the cases of circular holes which exist in a finite domain. According to the results, (1) the maximum stress concentration factor is higher for greater incident wave curvature and (2) the maximum dynamic stress concentration factor approaches to a value which is higher than that of single hole, as the radius ratio between the holes becomes greater, when the radii of the curvature and of the reference hole are kept constant.