Three-dimensional crack front fields in a thin ductile plate

摘要: Abstract Based on detailed finite element solutions, various aspects of the 3-D fields near a crack front in thin ductile plate are analysed. In particular, stress field immediate vicinity is carefully investigated. The existence and size local J-dominated determined from comparison complete tip with plane strain HRR solutions using dominance parameter. conjunction an estimated deformation zone, loss HRR-dominance along also studied. Physically, at higher load occurs when region outgrows (local) region, which essentially limited by geometry plate. Alternatively, (at mid-plane) low hardening material under (in-plane) small scale yielding requires thickness to exceed 0.5(K1/σ0)2, thus limiting maximum in-plane extent plastic zone fractio thickness. Furthermore, such restriction precludes coexistence surrounding HRR-fields within