Damage Accumulation in Advanced Metal Matrix Composites Under Thermal Cycling/Creep Loadings.

摘要

Both experimental and analytical studies were conducted during the first year with the aim of identifying the damage accumulation process in a metal matrix Composite (MMC) subjected to combined creep and thermal cycling loadings, The main achievements in the experimental study are: completion of a new thermal cycler with constant stress loading capability, preliminary data of dimensional change of SiCp/6061 Al matrix composite and R-Curve behavior of PSZ-SS/PSZ composite--PSZ laminate, Whereas the first year analytical study includes construction of dislocation Punching model from ceramic/metal interfaces, a construction of analytical modeling of creep strain of a MMC subjected to either creep loading or combined creep/thermal cycling loading where the debonding of the mat fiber interface is accounted for, Three-parameter Weibull function is employed i model to simulate the distribution of the actual interfacial strength.