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Determining the tensile strength of concrete for wedge splitting specimens based on the fracture extreme theory
Theoretical and Applied Fracture Mechanics ( IF 5.3 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.tafmec.2020.102654 Yang Li , Longbang Qing , Yuehua Cheng , Guowei Ma
Theoretical and Applied Fracture Mechanics ( IF 5.3 ) Pub Date : 2020-08-01 , DOI: 10.1016/j.tafmec.2020.102654 Yang Li , Longbang Qing , Yuehua Cheng , Guowei Ma
Abstract Two theoretical methods were developed to determine the tensile strength ft of concrete using wedge splitting specimens based on nil-stress intensity factor (nil-SIF) criterion and force equilibrium theory, respectively. With the fracture extreme theory (FET), only experimental peak load of one specimen was needed and did not require the measurement of critical crack mouth opening displacement CMODc for calculation. The existing experimental data were utilized to verify the two methods. Results show that the values of ft were insensitive to the initial notched ratios a0/D and agreed well with the experiment data. The influence of the size of the specimen was analyzed, ft was affected by the specimen size when the nil-SIF criterion was adopted. Nevertheless, ft calculated by the force equilibrium theory appeared to be kept a constant when the height of the specimen varied from 200 mm to 600 mm. Finally, the critical effective crack length ac and critical crack tip opening displacement CTODc were obtained and compared using the two methods.
中文翻译:
基于断裂极限理论的楔形劈裂试件混凝土抗拉强度的确定
摘要 分别基于零应力强度因子(nil-SIF)准则和力平衡理论,开发了两种理论方法来确定使用楔形劈裂试件的混凝土抗拉强度ft。使用断裂极限理论(FET),只需要一个试样的实验峰值载荷,不需要测量临界裂纹开口位移 CMODc 进行计算。利用现有的实验数据对两种方法进行验证。结果表明,ft 的值对初始缺口比 a0/D 不敏感,并且与实验数据吻合良好。分析了试件尺寸的影响,当采用nil-SIF准则时,ft受试件尺寸的影响。尽管如此,当试样的高度从 200 毫米到 600 毫米变化时,由力平衡理论计算的 ft 似乎保持恒定。最后,得到了两种方法的临界有效裂纹长度ac和临界裂纹尖端张开位移CTODc,并进行了比较。
更新日期:2020-08-01
中文翻译:
基于断裂极限理论的楔形劈裂试件混凝土抗拉强度的确定
摘要 分别基于零应力强度因子(nil-SIF)准则和力平衡理论,开发了两种理论方法来确定使用楔形劈裂试件的混凝土抗拉强度ft。使用断裂极限理论(FET),只需要一个试样的实验峰值载荷,不需要测量临界裂纹开口位移 CMODc 进行计算。利用现有的实验数据对两种方法进行验证。结果表明,ft 的值对初始缺口比 a0/D 不敏感,并且与实验数据吻合良好。分析了试件尺寸的影响,当采用nil-SIF准则时,ft受试件尺寸的影响。尽管如此,当试样的高度从 200 毫米到 600 毫米变化时,由力平衡理论计算的 ft 似乎保持恒定。最后,得到了两种方法的临界有效裂纹长度ac和临界裂纹尖端张开位移CTODc,并进行了比较。