基于损伤理论的混凝土Ⅰ-Ⅱ复合型裂缝扩展角  

Propagation Angle of Ⅰ-Ⅱ Mixed Mode Crack in Concrete Based on Damage Theory

作　　者：王玉琳[1] 王向东[1] 韩金启 杨林[1] 

机构地区：[1]河海大学力学与材料学院,江苏南京210098

出　　处：《河南科技大学学报（自然科学版）》2015年第6期51-54,60,共5页Journal of Henan University of Science And Technology:Natural Science

基　　金：国家"十一五"科技支撑计划基金项目(2008BAB29B03);国家自然科学基金项目(50878077)

摘　　要：基于混凝土断裂与损伤的基本理论,进行了Ⅰ-Ⅱ复合型裂缝扩展方向研究,研究结果表明:Ⅰ-Ⅱ复合型裂缝扩展趋势是随着缝端损伤场的变化而变化的。通过缝端损伤场及损伤梯度的计算,分析了Ⅰ-Ⅱ复合型裂缝从起裂至失稳断裂裂缝扩展方向的变化规律,得到了Ⅰ-Ⅱ复合型裂缝的起裂扩展角和失稳扩展角。将其与文献结果进行对比,对比结果表明:用损伤理论研究裂缝的扩展角是可行的。Based on the basic theory of concrete fracture and damage,the propagation direction of Ⅰ-Ⅱ mixed mode crack was studied. It indicates that the crack propagation direction is changed with the change of crack tip damage field. Through the calculation of damage field and damage gradient,the rule ofⅠ-Ⅱ mixed mode crack from initiation to instability was analyzed,and the initiation and instability expansion angles of Ⅰ-Ⅱmixed mode crack were obtained. Compared with the result obtained from the literature,the research method on crack propagation angle via the damage theory is practicable.

关 键 词：混凝土 损伤梯度 断裂 Ⅰ-Ⅱ复合型裂缝 扩展角 

分 类 号：TU528.01[建筑科学—建筑技术科学]