文章摘要
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
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
投稿时间:2017-10-12  
DOI:10.13243/j.cnki.slxb.20170989
中文关键词: 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
英文关键词: double-K fracture model  double-G fracture parameters  energy release rate  modified round compact tension specimen
基金项目:浙江省自然科学基金项目(LR16E080001);国家自然科学基金项目(51378461)
作者单位E-mail
李庆华 浙江大学 高性能建筑结构与材料研究所, 浙江 杭州 310058  
种法澄 浙江大学 高性能建筑结构与材料研究所, 浙江 杭州 310058  
张麒 浙江大学 高性能建筑结构与材料研究所, 浙江 杭州 310058  
徐世烺 浙江大学 高性能建筑结构与材料研究所, 浙江 杭州 310058 slxu@zju.edu.cn 
摘要点击次数: 199
全文下载次数: 244
中文摘要:
      双G断裂模型是双K断裂模型的延伸和补充。采用改进的圆形紧凑拉伸法进行试验,首先验证这种新型断裂力学试验方法能否获得稳定的双G断裂参数,并将公式K=√EG得到的双K断裂韧度与直接计算得到的结果相比较,进一步验证双G断裂模型和双K断裂模型在描述断裂性能方面的等效性。同时研究了两种断裂模型参数的尺寸效应。试验试件直径从150 mm到300 mm变化,共计分为4组。试验结果表明,采用改进的圆形紧凑拉伸法测得双G参数的数值较为稳定,离散性较小。双G断裂模型和双K断裂模型在描述断裂性能方面具有很高的等效性。在本文的尺寸范围内,当试件直径大于200 mm时,起裂断裂参数KIciniGIcini没有明显的尺寸效应,失稳断裂参数KIcunGIcun随着试件尺寸的增大而增大,但增长幅度不大。
英文摘要:
      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.
查看全文   查看/发表评论  下载PDF阅读器
关闭