科研之友
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摘要
The uniaxial tensile behavior of unidirectional C/SiC ceramic-matrix composites at room temperature has been investigated. An approach to predicting the uniaxial tensile stress-strain curve of the unidirectional ceramicmatrix composites is developed. The Budiansky-Hutchinson-Evans shear lag model is used to describe the microstress field of damaged composites. A statistical matrix cracking model, a fracture mechanics interface debonding criterion, and a statistical fiber failure model are used to determine the spacing of matrix cracks, the debonded length of interface, and the volume fraction of failed fibers. By combining the shear lag model and the three damage models, the stress-strain curve at each damage stage is constructed and an exact method for predicting the toughness and strength of the composites is established. The tensile stress-strain curves predicted by the present analysis agree well with experimental data.
