Based on Optical Time Domain Reflectometry, detecting disengaging at interface of steel tube-confined concrete (STCC) with distributed optical fibers was investigated.

When matrix is brittle and interface bonding is weak, it is usual that cracks develop first in the matrix and then interface debonding occurs.

The critical matrix strain energy criterion,strain energy release rate criterion and Curtin s statistical failure criterion were used to describe the matrix cracking,interface debonding and fiber failure,and to determine the matrix cracking .

On the interfacial debonding of particulate-reinforced nonlinear viscoelastic polymeric material;

The interfacial debonding, crazing and shear yielding are analysed when the interaction among the muIti-particle is taken into account.

In the present paper, the relations between the interfacial debonding rate, debonding length and the number of cyclic loading are obtained by the use of three different degradation models.

Based on cohesive interface debonding model,the Mori-Tanaka method is used to study the effect of nonlinear interface debonding on the mechanical performance of composite propellant.

In order to validate the ability of the generalized method of cell(GMC) with weak interface in modeling the interface debonding within continuum fiber reinforced composite,three kinds of week interface were considered in this paper to study the effect of the interface on global mechanics behavior of composite.