力学与实践 ›› 2003, Vol. 25 ›› Issue (2): 0-0.DOI: 10.6052/1000-0992-2002-322

• 应用研究 •    

纤维复合材料复合型断裂正应力强度因子比准则

刘希国 张双寅   

  1. 中科院力学所 100080 中科院力学所 100080
  • 收稿日期:2002-09-09 修回日期:1900-01-01 出版日期:2003-04-10 发布日期:2003-04-10

NORMAL STRESS INTENSITY FACTOR RATIO CRITERION FOR MIXED MODE FRACTURE OF FIBER COMPOSITES

  • Received:2002-09-09 Revised:1900-01-01 Online:2003-04-10 Published:2003-04-10

摘要: 对纤维增强复合材料的裂纹起裂及开裂方向准则进行了研究, 提出了复合型断裂的正应力强度因子比准则(Normal Stress Intensity Factor Ratio Criterion). 此准则是一种综合考虑了正应力强度 因子和剪应力强度因子对裂纹起裂的推动作用的准则,并且不需要 预先确定材料的特征尺度,使用较方便,且预测结果是很好的.

关键词: 复合材料, 复合型断裂, 正应力强度因子比准则

Abstract: The normal stress intensity factor ratio criterion for predicting cracking initiation and cracking direction of the mixed mode fracture of fiber composites is proposed. In the criterion the effects of both normal stress intensity factor and shear stress intensity factor are taken into consideration. In using the criterion it is not necessary to determine the characteristic dimension $r_{0}$ of the material in the vicinity of crack tip, so it is quite convenient and can yield good results.

Key words: camposite material, mixed-mode fracture, normal