纤维复合材料在无较大的刀口时,可认为其失效起源于材料的内部缺陷。这些缺陷可以是纤维折断,基体中的缝隙及接合面脱胶。纤维越长,在低于复合材料的纤维平均强度载荷下引起单个纤维折断的可能性就越大。这样,在单根纤维折断后,将会引起更多的纤维脱胶和折断及纤维基体的分离。基体中的缺陷也可引起各纤维之间的基体 Fiber composite material in the absence of a large knife-edge, it can be considered as the failure of the material originated in the internal defects. These defects can be fiber breakage, gaps in the matrix, and debonding of the joint. The longer the fiber, the greater the probability that a single fiber will break under an average fiber strength load below the composite. In this way, after a single fiber breaks, it will cause more fiber degumming and breakage and fiber matrix separation. Defects in the matrix can also cause the matrix between the individual fibers