基于缝端损伤区域的混凝土材料Ⅱ型裂缝扩展角研究  

Study of propagation angle of mode Ⅱ crack of concrete material based on damage area at crack tip

作　　者：陈殿华[1] 王向东[1] 邵兵[1] 

机构地区：[1]河海大学力学与材料学院,江苏南京210098

出　　处：《河海大学学报（自然科学版）》2014年第3期246-249,共4页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金(50878077)

摘　　要：根据Ⅰ型裂缝和Ⅱ型裂缝在损伤与断裂耦合方面的联系,基于Ⅰ型裂缝的损伤方程推导出更适用于Ⅱ型裂缝的损伤演化方程,得到损伤区域的计算方法。通过损伤梯度研究Ⅱ型裂缝从损伤至开裂阶段裂缝发展方向的变化规律,最终得到Ⅱ型裂缝的扩展角是79°。将该扩展角与经典判据得到的扩展角进行对比,结果表明该方法是可行的。According to research on modeⅠand modeⅡcrack damage coupled with fractures, a damage evolution equation that is more suitable for mode Ⅱ cracks was established based on the damage equation of a mode Ⅰcrack. Then, the calculation method for the damage area was obtained. The variation of the direction in which the crack developed was studied using the damage gradient, over a period ranging from damage to cracking of the modeⅡ crack. Finally, the propagation angle of the mode Ⅱ crack was determined to be 79°. This propagation angle was compared with that obtained by the classic criterion. The results show that the method used in this study is feasible.

关 键 词：混凝土 Ⅱ型裂缝 损伤区域 断裂 扩展角 

分 类 号：TU528.01[建筑科学—建筑技术科学]