岩土工程学报2016，Vol.38Issue(z1)：62-68,7.DOI:10.11779/CJGE2016S1011
PVC土工膜双向拉伸试样优化研究
Optimization of PVC geomembrane specimens for biaxial tensile tests
摘要
Abstract
The most common PVC geomembrane specimen used in biaxial tensile tests is a traditional cruciform one characterized by four rectangular clamp arms, intersection of which is connected by a corner fillet. Based on the traditional cruciform specimen, the maximum measured true strain in the central area can only reach 30%, which is far less than the prospective strain level under biaxial tension loads for PVC geomembrane. In order to get a more complete stress-strain curve of this material, a reinforced dumbbell-shaped specimen is designed on the basis of the traditional specimen by means of a coupled method of numerical simulation and experiment verification. The results of verification tests show that this new specimen presents high and evenly-distributed stress and low degree of stress concentration in biaxial tension states. The maximum true strain obtained at failure time can reach 100.4%, indicating that the reinforced dumbbell-shaped specimen can meet the demands of mechanical property research of PVC geomembrane under biaxial tension states.关键词
PVC土工膜/双向拉伸试验/力学特性/应力-应变关系/试样优化Key words
PVC geomembrane/biaxial tensile test/mechanical property/stress-strain relationship/specimen optimization分类
建筑与水利引用本文复制引用
周天娥,束一鸣,吴海民,张宪雷,刘云锋,郝雪航..PVC土工膜双向拉伸试样优化研究[J].岩土工程学报,2016,38(z1):62-68,7.基金项目
国家自然科学基金项目（51079047，51379069，51409083）；江苏高校优势学科建设工程项目 （）
