FREE-EDGE STRESS INTENSITY FACTOR FOR A BONDED DUCTILE LAYER SUBJECTED TO SHEAR

The stress state found in a thin, power-law hardening ductile layer bo nded between a pair of rigid adherends and subjected to a shear loadin g is investigated. Within the context of a work-hardening plasticity t heory, a stress singularity of type Kr(delta) (delta < 0) exists at th e point where the interface between one of the rigid adherends and the ductile layer intersects the stress-free edge. The intensity of this singularity (i. e., K) has been calculated for a plane strain conditio n using a technique that combines results of an asymptotic analysis of the stress singularity with those of a detailed finite element analys is. A dead-soft aluminum layer is considered first with emphasis place d on an assessment of the region dominated by the plastic stress singu larity. Results for a fully plastic layer with negligible elastic stra ins are presented next. The relation defining the.fully plastic, free- edge stress intensity factor for a shear loading depends only on a cha racteristic shear stress, layer thickness, and the layer's hardening e xponent.