Next, the review was focused on the effect of initial density on the material failure characteristic.
其次，重点考察了初始密度对材料破坏特性的影响。
Firstly, the material initial heterogeneity was reviewed by analyzing the initial density of specimens of the same group.
首先，通过分析同一批试件的初始密度，考察了材料的初始非均匀性；
It was found that the amount of the grains broke increased with the shear strain and confining pressure, independent of the initial density of the specimen.
试验表明，颗粒破坏的数量随着剪切变形和侧限压力的增大而增多，与试样的初始密度却无直接关系。
Therefore, for metal foam with highly complicated mesostructure heterogeneity, it is not enough to describe their material characteristics only using initial density.
因此，对于泡沫金属这种细观结构非均匀性比较严重的材料，仅仅使用初始密度尚不足以刻画其材料特征。
And for the specimens with different initial density, their failure stresses increases with the increment of initial density, but failure strains do not follow any obvious regular patterns.
对于不同初始密度的试件，破坏强度有随初始密度的增加而变大的趋势，但破坏应变则无明显的变化规律。
And for the specimens with different initial density, their failure stresses increases with the increment of initial density, but failure strain does not present any obvious regular patterns.
对于不同初始密度的试件，破坏强度有随初始密度的增加而变大的趋势，但破坏应变则无明显的变化规律。
And for the specimens with different initial density, their failure stresses increases with the increment of initial density, but failure strain does not present any obvious regular patterns.
对于不同初始密度的试件，破坏强度有随初始密度的增加而变大的趋势，但破坏应变则无明显的变化规律。
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