Rate dependent fracture along a silicon/epoxy interface under mixed-mode loading conditions

This paper describes the development of a dual-actuator loading device that was then used to apply asymmetric, transverse end-displacements laminated beam specimens (silicon/epoxy/silicon) over range separation rates. Measurements reaction forces, as well load-point displacements and rotations, were determine normal tangential components crack tip corresponding J-integral. made possible because identically satisfied balance condition. The resulting data set obtained from experiments conducted at five rates each mode-mix phase angles is testimony efficiency approach. A mixed-mode on elastic foundation analysis established stiffness shear interactions silicon/epoxy interface independent rate mode-mix. Furthermore, values thus determined considerably lower than those based bulk behavior epoxy in tension shear. also allowed growth be tracked order establish its onset critical J-integral, along with strengths displacements. For mode-mix, these increased rate. increase properties spite glassy nature further suggests presence an interphase region adjacent silicon. However, change accompanied by local rates, leading non-monotonic Following growth, application radial paths resulted simultaneous changes implying fracture criterion depends both rate-dependent damage evolution processes.