A theory of delayed crack instability of viscoelastic bodies is pro-posed in this paper.
本文提出了粘弹性裂纹体的延迟失稳理论。
Volcanically water flooding of oil well is very ubiquitous during oil developing. It is the result of crack instability propagation in the reservoir.
油井暴性水淹是裂缝性砂岩油田开发的普遍特征，其中很多是由注水引起裂缝失稳扩展所致。
Using the LFEM theory, the author provided the computing method of stress strength factor of crack and the criteria of crack instability propagation and propagation angle.
本文根据砂岩储层的物理力学特征，运用断裂力学理论，给出了储层裂缝的应力强度因子的计算方法，定量地分析了开发过程中储层裂缝失稳扩展的判据、裂纹扩展方向。
The main defects of laser spot welding of aluminum are crater, hot crack and porosity which created by oxide film and keyhole instability,.
焊点中存在的主要缺陷是气孔，表面下塌，热裂纹，其中气孔主要为氧化膜气孔和匙孔不稳定形成的气孔。
Special attention has been focused on the instability phenomenon associated with crack propagation.
我们特别把注意力集中在裂纹扩张过程中的不稳定现象上。
Combining with the cohesive crack model, the behavior of structure in the range from ductile to brittle instability and the factors influencing the brittle failure are studied.
结合粘结裂纹模型，研究了结构从延性到脆性失稳的特性以及引起脆性破坏的影响因素。
Combining with the cohesive crack model, the behavior of structure in the range from ductile to brittle instability and the factors influencing the brittle failure are studied.
结合粘结裂纹模型，研究了结构从延性到脆性失稳的特性以及引起脆性破坏的影响因素。
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