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Asymmetric Single Edge Notched Bend (ASENB) specimen which is exposed to asymmetric 3-point bending is used to estimate the mixed-mode fracture (I/II) in epoxy. The mode I and mode II combination stress intensity factors (SIF) were calculated for various locations of loading points and different crack lengths using the finite element analysis tool ANSYS. By selecting suitable points for the support positions with the loading point mode I to mode II mixities can be achieved. Then, several fracture tests on epoxy resin were conducted using the suggested ASENB specimen. The crack path follows a straight line for mode I fracture and a curved path from the crack initiation angle for mode II fracture and mode II dominant loading. The broken specimen surfaces under various conditions of loading were observed using scanning electron microscopy (SEM). Fractured specimen surfaces of the tested specimens showed reasonably smooth patterns indicating cleavage fracture.
Shashidhara et al. (Thu,) studied this question.