试样内部各部位的应力大小分布不均匀，随应变速率的增大，最小应力值由自由变形的鼓形区域逐步向心部移动；
The effective stress of specimen is inhomogeneous. As the strain rate increases, the minimum stress value moves from the drum-shaped region to the heart of specimen.
通过水泥砂浆模型实验，得到了理想的名义不偶合系数与切缝宽度，测试分析了不均匀的动态应变场。
Through model experiments, reasonable decouple coefficient range and slot width are gotten, and unsymmetrical dynamic strain field is analyzed.
在它的作用下，块体边界或某些部位出现应力不均匀并有应变能的积累。
The stress non uniformity and accumulation of energy on the boundary or in certain parts of some blocks appear.
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