spherical tensor of stress

Consequently an analytical equation in terms of porosity, strain and spherical stress tensor is put forward by virtue of logarithmic strain, the plastic condition and the physical equation of pore mechanics.

为此，本文利用对数应变和孔隙力学的塑性条件及物理方程，建立了孔隙率与变形和应力球张量的解析关系式，进而得到了疏松缺陷压实的修复条件。

The porosity defect is that in certain area inside the cast ingot exist small cellular voids relatively equally distributed, slight difference in mechanical properties, obvious plastic volume deformation and variation of relative density governed by the spherical stress tensor.

疏松缺陷是一定区域上相对均匀分布着的蜂窝状小空洞，疏松区域上各处的力学性能相差小，表现为明显体积塑性变形，材料的相对密度变化主要依赖于应力球张量。

The thesis deals with the experimental study on the constitutive relationships of concrete under one kind of complex loading path that contains the feedback control of strain& proportional monotonic loading path with constant confining deformation under stress spherical tensor. The thesis includes five chapters as follows.

本文针对混凝土材料进行了一种加载路径中包含对应变反馈控制的复杂加载路径的试验研究&在球量荷载下，恒侧向变形路径单调比例加载的试验研究。