Model representation of an axisymmetric steel-aluminum sample for simulation of a separation test

Abstract

The object of research is a bimetallic composite material with a thin intermediate layer of aluminum. The aim of the work is to determine the features of the stress-strain state at the interlayer boundaries of a steel-aluminum composite material with a thin layer using the computational exper-iment method and to calculate separation resistance using the energy criterion. The stress-strain state along the boundaries of the joint at delamination is determined from the results of modeling the de-formation of axisymmetric samples made of a steel-aluminum bimetallic composite material with a thin intermediate layer of aluminum. A series of computational experiments with varying the critical rate of elastic energy release under separation conditions, including under the combined influence of low temperatures and static loads, is implemented. The energy criterion is used to evaluate the stress level that leads to the separation of the bimetallic compound. The dependence of the separation re-sistance along the ring contour on the critical rate of elastic energy release, which is variable in the range of 0.1 to 0.5 N/mm, is calculated. It is established that, for the studied variants of the compu-tational experiment, a rigid stress state with a predominance of normal tensile stresses is realized at the place of delamination onset.