水利学报2018，Vol.49Issue(4)：474-482,9.DOI:10.13243/j.cnki.slxb.20170989
改进的圆形紧凑拉伸法研究混凝土双G断裂参数
Study of double-G fracture parameters using modified round compact tension method
摘要
Abstract
The double-G fracture model is an extension and supplement of the double-K fracture model.The modified round compact tension method were used to verify whether the new fracture mechanics test method can obtain stable double-G fracture parameters.The double-K fracture toughness calculated by the formula K=√EG was compared with the direct calculation results,in order to further verify the equivalence between the double-G fracture model and the double-K fracture model in describing fracture performance.At the same time,the size effect of two fracture models was studied.The diameters of the 16 test specimens varied from 150mm to 300mm,which were divided into 4 groups.The experimental results show that the value of the double-G parameters measured by the modified round compact tension method is more stable and the dispersion is smaller.The double-G fracture model and the double-K fracture model have high equivalence in describing the fracture properties.When the specimen diameter is greater than 200mm,initial fracture toughness KIcini and initial energy release rate GIcini have no obvious size effect,unstable fracture toughness KIcun and unstable energy release rate GIcun increases with the specimen size increasing,but the growth is small.关键词
双K断裂模型/双G断裂参数/能量法/改进的圆形紧凑拉伸试件Key words
double-K fracture model/double-G fracture parameters/energy release rate/modified round compact tension specimen分类
建筑与水利引用本文复制引用
李庆华,种法澄,张麒,徐世烺..改进的圆形紧凑拉伸法研究混凝土双G断裂参数[J].水利学报,2018,49(4):474-482,9.基金项目
浙江省自然科学基金项目(LR16E080001) （LR16E080001）
国家自然科学基金项目(51378461) （51378461）
