简介:AnewlydevelopedZfracturecriterionforthecompositematerialswasintroduced,thenewconceptsofin-planeaveragestrain,in-planedilatationalstrainenergydensityfactorandreciprocalcharacteristicfunctionwerepresented.ManyexperimentalresultsshowthattheZfracturecriterioncanbewellusedtopredictthecrackpropagatingdirectionformodeⅠcrackincarbon-fiberreinforcedcompositelaminates.