Failure mechanism in an epoxy adhesive layer under compression + shear testing at −50 °C
摘要
The paper presents the results of studying the fracture of an epoxy layer in modified Brazil-nut-sandwich specimens. The effect of the angle α between the compression direction and the plane of the epoxy-metal interface on the fracture pattern is studied. The specimens with three adhesive compositions synthesized on the basis of the ED-20 epoxy resin are tested. It has been found that the cohesive failure mechanism dominates only at the angle α = 0° for all the epoxy compositions. The failure mechanism changes to the mixed adhesive-cohesive one as the angle α increased.