初始裂纹对碳纤维层合板断裂韧性影响的研究  

Influence of initial crack on fracture toughness of carbon fiber laminates

作　　者：文韬[1] 刘逸众[1] 程党根[1] 

机构地区：[1]空军航空维修技术学院,湖南长沙410124

出　　处：《兵器材料科学与工程》2014年第4期86-90,共5页Ordnance Material Science and Engineering

基　　金：湖南省职业院校教育教学改革研究项目(ZJA2013011)

摘　　要：采用碳纤维增强双马来酰亚胺树脂基复合材料层合板材料,制取了不同初始裂纹长度的试样,采用三点弯曲试验得到其弯曲断裂载荷-位移曲线,并采用柔度变化率的方法确定起裂点,用J积分的远场公式来计算JIC值。结果表明:碳纤维复合材料层合板具有"假塑性"的力学行为;随切口深度a/W增加,起裂点载荷值减小,并且当切口深度比较浅时,JIC值不稳定。Through three-point bending test, the bending fi＇acture load-displacement curves of the carbon fiber reinforced resin BMI mairix composites under the lengths of the different initial cracks were obtained, and JIC value was calculated by J-integral＇ s far-field formula. The results show that tbe laminates＇ bending fracture has the meehanical behavior of quasi-brittle. The load value at the crack initiation point can be reduced by increasing a/W, and when the depth of crack initiation is smaller, JIC is unstable.

关 键 词：碳纤维增强树脂基复合材料 断裂试验 起裂载荷 柔度变化率 

分 类 号：TB333[一般工业技术—材料科学与工程]