科研之友
微信
新浪微博
Facebook
分享链接
摘要
An analytical method is presented for delamination analysis of a sandwich beam subjected to an action of a transverse load. The stress/strain state of the sandwich beam including delamination is decomposed into two states: basic state and additional state. The additional state of the delaminated sandwich beam is investigated using the theory of high-order shear strain. The ordinary differential equations for delaminated and undelaminated zones in the additional state are obtained. Because of stress singularity at delamination frontier, the usual displacement and stress continuity conditions between the delaminated and undelaminated zones are not suitable for an approximate analytical solution. Therefore, new weak form of continuity condition is suggested. Comparison with a numerical solution reveals that the analytical solution method provides good accuracy in both delaminated and undelaminated. areas. A new method of calculating energy release rate of delamination growth for a sandwich beam is elaborated on the basis of the developed analytical technique. The considered sample delamination problem shows that, the higher the order of shear strain approximation is; the more precise the approximate analytical solution is.
