计算结果表明：中间主应力对构造结构面之间的空间组合规律具有重要影响。
The numerical results showed that the intermediate principal stress weightily affected the spatial combination regularities of different kinds of structure planes.
研究表明，多轴应力状态下NEPE固体推进剂强度与应力相关，八面体剪应力随平均主应力的增加呈非线性增加；NEPE推进剂的破坏强度随拉伸速率的增加而提高。
The results show that strength of NEPE solid propellant under multi-axis stress state is related to strain; octahedral shear stress nonlinearly increases with the average main stress.
编制的软件有友好的界面并可用于主应力空间中各种工程材料屈服面和破坏面的模型及计算机辅助教学。
The present users-friendly software can be widely used in establishing the yield and failure surfaces for various engineering materials and the computer aided instruction (CAI).
在此基础上，分析了双轴拉-压极限强度随冻融循环次数的变化规律，并在主应力空间和八面体应力空间建立了同时考虑冻融循环次数和拉压比的破坏准则。
On this basis, the failure criterion of concrete simultaneously considering the freeze-thaw cycle and tension-compression ratio in principle stress space and octahedral space is established.
随着中间主应力和最小主应力的增加，空间弱面破坏角度范围具有变小的趋势。
And the spatial failure region becomes smaller with the increased values of the middle and minimum principal stresses.
随着中间主应力和最小主应力的增加，空间弱面破坏角度范围具有变小的趋势。
And the spatial failure region becomes smaller with the increased values of the middle and minimum principal stresses.
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