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采用三点弯曲加载梁试件测定了砂浆的柔度标定曲线和载荷—沿初始裂纹及其韧带直线方向若干点位移循环加载全曲线。结果表明:用柔度标定法所测定的不同初始裂纹相对长度下临界应力强度因子大于直接测定最大载荷所得相应值:当初始裂纹相对长度一定时,若有效裂纹相对长度或其增量增加,断裂过程区相对长度估算值随着增加;当断裂过程区相对长度估算值一定时初始裂纹相对长度增加,有效裂纹相对长度及其增量增加;若初始裂纹相对长度一定时,裂纹口张开位移或初始裂纹尖端张开位移增加,有效裂纹相对长度增量随着增加;若裂纹口张开位移或初始裂纹尖端张开位移一定时初始裂纹相对长度增加,有效裂纹相对长度增量减少。
The three-point bending beam specimen was used to measure the compliance curve of mortar and the whole curve of loading-displacement along several points along the initial crack and the straight line of the ligament. The results show that the critical stress intensity factor of different initial crack relative length measured by compliance calibration method is larger than the direct measurement maximum load. When the relative length of initial crack is constant, if the relative length of effective crack or its increment increases, the fracture The relative length of the process zone increases with the increase of the relative length of the process zone; the relative length of the initial crack increases as the relative length of the fracture zone estimates a certain value, and the relative length of the effective crack and its increment increase; if the initial length of the crack is constant, The initial crack tip open displacement increases, the effective length of the crack increases with increasing; if the crack opening or displacement of the initial crack tip opening a certain increase in the relative length of the initial crack, effective crack relative length increment decreases.