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为了研究中心裂纹巴西圆盘试件在压缩载荷作用下T应力的解析计算方法,通过权函数法推导出集中载荷作用下T应力的显式表达式,进而得到分布载荷作用下的T应力表达式。与边界配位法进行对比,所得公式优点在于任意相对裂纹长度和任意加载角下的T应力值都能较容易的精确得到。进一步分析表明,分布载荷与集中载荷作用下T应力的偏差随着载荷分布角的增加而增加。集中载荷作用下,相对裂纹长度固定时,T应力随着加载角的增大而增大。中心裂纹巴西圆盘纯I型与纯II型断裂试验时,大多数情况下的T应力都为负值。T应力值对中心裂纹巴西圆盘测定断裂韧度试验有影响,想要通过使T应力为0来消除这种影响是很难达到目的的。
In order to study the analytic calculation method of T stress under the action of compressive load, the explicit expression of T stress under concentrated load is deduced by the weight function method, and then the T stress expression under distributed load . Compared with the boundary coordination method, the resulting formula has the advantage that any relative crack length and T stress value at any loading angle can be easily and accurately obtained. Further analysis shows that the deviation of T stress under distributed load and concentrated load increases with the increase of load distribution angle. Under the condition of concentrated load, the T stress increases with the increase of the loading angle when the relative crack length is fixed. In the case of center-crack Brazilian disc pure Type I and Type II fracture tests, the T stress is negative in most cases. The value of T stress has an effect on the test of fracture toughness of a Brazilian cracked core disk. To eliminate this effect by making T stress zero, it is difficult to achieve this goal.