A CDM-BASED BINARY MODEL FOR THE PROGRESSIVE DAMAGE PREDICTION OF SiC/SiC CERAMIC MATRIX COMPOSITES UNDER TENSION LOADING

In this paper, two benchmarking exercises for advanced ceramic matrix composites (CMCs)-challenge problem #1 and #2 of the Enhanced Physics-Based Prognosis and Inspection of CMC (EPPIC) program have been conducted to assess the capability of the continuum damage mechanics (CDM)-based binary model (BM)for progressive damage prediction in two SiC/SiC CMC systems: GEA SiC/SiC and S200H. The damage evolution laws of the equivalent matrix and fiber tows in the BM are first calibrated using provided/existing experimental data, and the calibrated model is then used to predict the damage onset and propagation in tension test specimens of GEA SiC/SiC and S200H. The overall strengths and weaknesses of the current modeling approach are discussed through rigorous comparison between the blind model predictions and the experimental validation data.