水力发电学报2018，Vol.37Issue(4)：26-35,10.DOI:10.11660/slfdxb.20180403
基于电子散斑干涉技术的混凝土裂纹扩展特性研究
Behaviors of crack propagation in concrete using electronic speckle pattern interferometry
摘要
Abstract
Fracture behaviors of concrete materials exhibit certain nonlinearity due to the existence of a fracture process zone (FPZ) and they play a crucial role in determining the bearing capacity and durability of hydraulic structures.To study the nonlinear fracture behaviors,we conduct three-point bending tests on pre-notched concrete beams and measure their full-field displacements using an electronic speckle pattem interferometry (ESPI).Variations in crack evolution are examined through analysis on the relationships of crack opening displacement (COD) versus crack length a at 15 loading levels.And new formulas are derived for the COD-a relationships based on ESPI measurements to replace the existing formula that is based on linear elastic fracture mechanics (LFEM) and inapplicable near a crack tip.关键词
断裂过程区/裂纹张开位移/裂纹扩展深度/三点弯曲/电子散斑干涉技术Key words
fracture process zone/crack opening displacement/crack propagation depth/three-point bending/electronic speckle pattern interferometry分类
建筑与水利引用本文复制引用
王青原,陈红鸟,袁波,黄兴震,赵艳兵..基于电子散斑干涉技术的混凝土裂纹扩展特性研究[J].水力发电学报,2018,37(4):26-35,10.基金项目
国家自然科学基金(51408144) （51408144）
贵州省科学技术基金项目([2016]1040) （[2016]1040）
贵州省留学人员科技创新项目([2016]17) （[2016]17）
