据此，建立基于最大主剪应变的岩土材料延性剪切破坏应变准则；
The strain criterion for ductile shear failure based on the maximum principal shear strain is established.
与此同时，如何建立脆性材料在双轴应力作用下的破坏准则一直是人们所追求的目标之一。
At the same time, how to establish the failure criterion of brittle materials in biaxial stress state is one of people's goal.
本文研究了复合材料的二阶型和三阶型张量多项式破坏准则的几种主要理论。
In this paper, some current anisotropic failure criteria in the forms of tensor polynomials are investigated.
介绍了适于混凝土材料的离散单元模型的破坏准则、计算方程以及弹簧系数等计算参数的确定方法。
The failure criterion, formula and determination of analytical parameters such as spring modulus of the discrete element model for concrete material were presented.
该破坏准则考虑了不同材料特性、钢纤维含量对空间破坏准则的影响，从而使不同混凝土材料破坏准则得到了统一。这是以前的研究工作所未曾涉及的。
The characteristics of different concrete materials and the influence of content of steel fiber on the failure criterion have been considered in the general failure criterion.
然而，岩石的破坏和断裂是紧密相联的，岩石强度准则的材料参数和断裂理论的断裂韧度存在特定的方程关系。
But the damage and fracture of rock is closely related to each other. And the relationship between strength criterion parameters of rock and fracture toughness of fracture theory is particular.
所以传统的基于应力空间的各种准则无法判断材料破坏与否，而基于应变空间进行表述则能克服这一局限。
So the traditional criteria built in the stress space cannot determine whether the material is destroyed. On the contrary, the criteria built in the strain space can properly deal with the problem.
材料破坏准则的采用是制约动态层裂机制研究的主要因素之一。
Adopting of failure criteria is one of major factors that restrict the mechanism research of dynamic spalling.
材料破坏准则的采用是制约动态层裂机制研究的主要因素之一。
Adopting of failure criteria is one of major factors that restrict the mechanism research of dynamic spalling.
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