Yield Zones in Polymeric and Metallic Plates under Pure Bending Containing a Through Crack

摘要

The Dugdale strip yielding model is extended to include plates under pure bending utilizing a superposition of stress intensity factors. Experiments on polycarbonate, mild steel and silicon iron are reported which validate the extended model. In the analysis both 4th and 6th order plate theories are considered. It is demonstrated that the 6th order theory gives the same results as an earlier solution obtained on the basis of stress functions developed from 4th order theory due to a peculiarity of the earlier solution. The effects of crack closure, not accounted for in the model, are discussed in relation to the agreement between analytical and experimental efforts. (Author)