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平台巴西圆盘复合型加载下T应力计算法

发布时间:2018-05-21 19:44

  本文选题:平台巴西圆盘 + T应力 ; 参考:《岩土力学》2016年S1期


【摘要】:平台巴西圆盘(CFBD)具有避免加载点处应力集中、保证破坏由预制裂纹尖端处起始的优点,成为研究脆性材料断裂性能的常用试件之一。最近的研究发现,T应力也会影响材料断裂性能,但平台巴西圆盘并没有计算T应力的解析公式。使用解析分析与有限元数值分析相结合的方法,对复合型加载条件下平台巴西圆盘试件的T应力进行了计算,并对误差进行了系统的分析。结果表明,在一定载荷分布角内相对裂纹长度?≤0.65时,不管是纯I、纯II还是复合型加载条件下平台巴西圆盘计算的T应力都可以用中心裂纹巴西圆盘均布载荷下T应力计算公式来计算;T应力相对误差随着相对裂纹长度的增加而增加。
[Abstract]:The platform Brazilian disc CFBD has the advantages of avoiding stress concentration at the loading point and ensuring that the failure begins at the tip of the precast crack. It has become one of the commonly used specimens to study the fracture properties of brittle materials. Recent studies have found that T stress also affects the fracture properties of materials, but there is no analytical formula for calculating T stress on the platform Brazilian disc. In this paper, the T stress of Brazilian disc specimen under composite loading condition is calculated by using the method of analytical analysis and finite element numerical analysis, and the error is analyzed systematically. The results show that when the relative crack length in a certain load distribution angle is 鈮,

本文编号:1920498

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