应力比对铝钢复合材料界面Ⅰ型裂纹应力强度因子的影响

Effect of stress ratio on stress intensity factor of mode-Ⅰcrack at interface of composite plate

以铝钢复合材料的Ⅰ型界面裂纹为研究对象,运用节点位移外推法求解复合材料Ⅰ型界面裂纹的应力强度因子,得到的应力强度因子通过节点位移表示.对应力强度因子进行有限元数值模拟,研究应力比和应力强度因子之间的关系.研究结果表明:在同一应力比条件下,应力强度因子随裂纹尺寸比的增大而增大;在同一裂纹尺寸比条件下,应力强度因子随应力比的增大而增大.

Taking mode-Ⅰinterface crack of aluminum-steel composite material as the research object,the node displacement extrapolation method is used to solve the stress intensity factor of mode-Ⅰinterface crack of the composite material.The obtained stress intensity factor was expressed by the node displacement.The finite element numerical simulation was carried out to study the relationship of stress ratio and stress intensity factor.The results show that under the same stress ratio condition,the stress intensity factor increases with the increase of crack size ratio.Under the same crack size ratio,the stress intensity factor increases with the increase of stress ratio.