Analytical method for estimating the damping in unidirectional ceramic matrix composites

Based on the stress distribution in the bonded and de-bonded region of ceramic matrix composite(CMC) with matrix cracks,the sliding mechanism of CMC was investigated,and the analytical method for estimating damping capacity in unidirectional CMC was derived.Numerical examples show that:(1) CMCs' inherent damping capacity is very small.The damping of CMC is mostly caused by the frictional energy dissipation along the damaged fiber-matrix interfaces.(2) The damping capacity of CMC will increase with the decreasing interfacial shear stress and the volume fraction of fibers.(3) When the matrix crack spacing increases,the damping coefficient of CMC is decreased.