摘要
水泥基复合材料因其固有的脆性和较低的抗拉强度,在工程结构中不可避免会发生开裂。胶囊法自修复系统为水泥基材料基体开裂的修复和延缓潜在危害提供了一种可行的方法。借助扩展有限元方法,模拟了微胶囊自修复水泥基模型材料内微裂缝的产生、扩展、断裂过程及胶囊破裂行为,验证了裂缝迫使胶囊发生破裂的概率;应用复合材料理论,计算出了不同掺量下球形/球柱形微胶囊修复前后水泥基复合材料的有效弹性模量,表征了该复合材料的修复效率。
Cementitious composites are inevitably to be cracked in engineering structures due to their inherent brittleness and low tensile strength.The capsule-based self-repairing system provides a feasible method for repairing and delaying the potential damage of cement-based material matrix.The occurring,spreading and fracturing process of micro-cracks and microcapsules fracture behavior in the self-repairing model material were simulated by an extended finite element method,and the hitting probability was validated.Meanwhile,the effective elastic modulus of self-repairing cementitious materials before and after repairing by spherical/spherical microcapsules with different contents was calculated via composite materials theory,and the repairing efficiency was characterized.
作者
吕忠
熊庭倩
陈惠苏
LV Zhong;XIONG Tingqian;CHEN Huisu(College of Civil Engineering and Architecture,Anhui University of Technology,Ma'anshan 243032,Anhui,China;School of Materials Science and Engineering,Southeast University,Nanjing 211189,China)
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2021年第2期357-364,共8页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金(51408002)
安徽省自然科学基金项目(1608085QE111,2008085ME164)资助项目。
关键词
水泥基材料
自修复
微胶囊
有效弹性模量
扩展有限元
cementitious materials
self-repairing
microcapsules
effective elastic modulus
extended finite element methods
