Damage develops fast after that period . and a nonlinear formula with parameter of unloading modulus and residual strain was brought out to describe damage development in tensile test . it is also found that mechanical properties of c fiber are much less than those of t300 fiber bundles 另外,通過進一步的分析發(fā)現(xiàn)三維編織c sic復(fù)合材料中纖維束的就位性能遠遠低于其摘要原位性能,這正是c / sic復(fù)合材料的拉伸性能遠低于t300 / qy9512復(fù)合材料的主要原因。