为了准确地预测铝合金板材成形极限，将韧性断裂准则引入到数值模拟中。
To accurately predict the forming limit in aluminum alloy sheet forming, ductile fracture criterion is introduced into numerical simulation.
本文讨论了线弹性断裂力学的复合型断裂准则。推荐了周向应变因子准则。
In this paper, the criteria of mixed mode brittle fracture are carefully examined. It has been shown that, the circumferential strain factor criterion is rational and safe.
本文主要针对混凝土双参数模型和双k断裂准则进行了以下几方面的研究。
Focusing on the Two Parameter Fracture Method and the double-Kcriterion, the following work is carried on in this paper.
目前已提出的韧性断裂准则预测板料成形极限，只在简单轴对称件中得到应用。
At present, some ductile fracture criteria are applied only to predict the forming limit in stamping forming of simple axisymmetric part.
结果表明所给出的单奇异性V形切口的脆性断裂准则有效、简单且便于工程应用。
The findings indicate that the brittle fracture criterion for V-notches with single singularity is valid and simple, so it can be applied to engineering conveniently.
本文建立了准静态情况下I型裂纹的断裂准则，提出了新的表面能概念及其表达式。
This article establishes a fracture criterion of crack type I under quasi-state conditions and brings forward a new concept and an expression of surface energy.
建立J - A_2双参数断裂准则，对不同裂纹深度的管道进行弹塑性断裂预测。
According to the fracture rule with two parameters J and A_2, the fracture press values of some cracked inner-pressed-pipelines were forecasted.
在参考相关文献的基础上，简要介绍了常用的岩石断裂准则，以及岩石断裂研究新情况。
This paper deals with some conventional criterions of rock fracture based on relevant references and advances in the study of rock fracture.
讨论了最大拉应力理论在V形切口中的应用问题；并探讨了复合型断裂准则的尺寸效应。
The application of the maximum tensile criterion to V-notch and the size effect of the fracture criterion of mixed mode are also discussed.
并利用韧性断裂准则作为胀形高度极限的判断依据，将模拟得到的必要数据代入到准则中。
Using the ductile fracture criterion as the reference for judging the limit height of the process to put the necessary simulation results into the criterion.
基于广义双剪应力强度理论，创建了一种新的三维复合型断裂准则——广义双剪断裂准则。
A new criterion of three dimensional mixed mode cracking is developed based on the generalized twin shear strength theory.
以层状复合岩体损伤破坏理论为基础，建立了层状复合岩体损伤本构方程及其破坏断裂准则。
Based on damage and destroy theory of bedded composite rock, damage principal equation and damage and fracture rules of bedded composite rock have been founded.
分析了爆破作用下含水裂隙岩体不同阶段裂隙的断裂扩展机理，提出了含水裂隙岩体断裂准则。
And after analyzing the propagation mechanism of crack at different stage of water-bearing fractured rock-mass, the fracture principles of water-bearing fractured rock-mass were proposed.
本文提出利用材料的力学性能参数，采用数值模拟与韧性断裂准则相结合的方法预测板材的成形极限。
This paper predicted the forming limit of sheet metals by using the mechanical property parameters of materials and combining the ductile fracture criteria with finite element simulation.
建立了这两个区域的损伤断裂准则和裂纹尖端的损伤局部化模型，可以更好地反映爆生气体作用下裂纹扩展的实际过程。
The damage and fracture criterions and the damage localization models at the crack tip are individually established, which can better realize the true process...
利用有限元方法模拟时，韧性断裂准则既可以应用到完全耦合的弹塑性损伤模型的增量方法中，也可以应用到一步有限元逆算法中。
When adopting FEA to model, DFC could not only apply into incremental approach with a fully coupled elastic and plastic damage model, but to one step inverse approach.
从防止带传动打滑失效和疲劳断裂失效出发，指出现有带传动设计准则之不足。
The deficiency of present belt drives design criteria is pointed out to get a start in sliding failure and fatigue fracture failure.
断裂的发生、运动与变形涉及岩石破裂准则与内部边界处理。
The criterion of rock failure and inner boundary condition need to be considered carefully while processing the fault growth, movement and deformation.
这些工作主要讨论了金属泡沫材料的拉伸、压缩、能量吸收、动态冲击、失效准则、本构关系、蠕变、疲劳和断裂等力学性能。
They are mainly concerned with the tensile and compressive behavior, energy absorption, dynamic impact, failure criterion and constitutive relation, creep, fatigue and fracture of these materials.
利用格利菲思强度准则和断裂力学原理求得了混凝土类脆性材料裂缝端部微裂缝区的边界方程。
A boundary 's equation of microcrack region near crack tip of such brittle materials as concrete has been obtained according to the Griffith' s criterion and fracture mechanics.
基于有限元结果和能量偏移准则，有效地评估了界面断裂韧性。
The interfacial fracture toughness is effectively evaluated based on the finite element results and the energy-based deflection criterion.
根据断裂力学的原理，提出了脆性破裂的止裂准则，给出了最小止裂方程。
Based on the principle of fracture mechanics, the stop criterion of brittle fracture is proposed and the equation of minimal crack stop is given.
这表明线弹性断裂韧度准则可应用于混凝土结构的裂缝评定。
It is also found that the linear elastic fracture toughness criteria are applicable to the crack evaluation of concrete structures.
基于岩体断裂力学的观点，探讨基于结构面扩展的岩体抗压强度准则。
Based on the viewpoints of rock fracture mechanics, compressive strength of rock mass controlled by discontinuities is discussed.
研究结果表明，该准则与一些试验结果吻合很好，它不仅可以广泛地用于分析岩土类材料的复合型断裂问题，而且也可以用于金属材料的断裂分析。
The consistence of the criterion with the test results indicates the criterion is suitable for analyzing mixed mode cracking not only of rock and soil but of metal as well.
计算结果表明，基于强度准则建立的岩石压剪断裂判据比较合理；
The calculation results show that the fracture criteria of the rock compression-shear mixed-mode crack based on the strength criteria are rational;
插销法冷裂缝试验中，应用“开裂”准则还是“断裂”准则，所得到的试验结果是有差异的。
The application of the criterion of initial cracking or that of fracture has different effects on the findings in the implant test for cold cracking.
准则表明最终的结构破裂取决于与临界损伤变量密切相关的断裂应变。
It is concluded that the final collapse of the structure is decided by the rupture strain that is deduced from the critical damage variable.
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.
研究了地质断裂面滑移的动力学行为，获得了断裂面滑移失稳的刚度准则。
The dynamic character of gravity fracture surface sliding is considered and the stiffness criterion of fracture surface sliding is proposed.
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