微裂纹

In order to understand the mechanism of the final stage of spallation deeply, we carried out computer simulations of the damage evolution of two-dimensional microcrack system.

为了深入研究层裂损伤后期的破坏机理，在实验研究和理论分析的基础上，进行了二维微裂纹系统损伤演化的计算机模拟。

A dissipative dynamic model of microcrack evolution is presented on base of a physical mechanism of growth-initiation-growth.

基于生长—触发—生长的物理机制，提出了一种耗散型微裂纹演化的动力学模型。

The essential feature of this model is the treatment of the dynamic fracture process as a continuous accrual of damage, where the damage mechanism has been attributed to the microcrack in the medium.

模型的基本特征是将脆性材料的动态破坏看作是连续损伤积累的过程，损伤来源于材料中的微裂纹。

Compared with the actual landslide, the simulation result is good, which proves that the microcrack is the primary factor to control the rock slope failure; and it is very valuable for understanding the failure mechanism of the jointed slope.

通过与实际滑坡形式进行对比，模拟效果好，证明微裂纹是控制岩质边坡破坏的主要因索，对理解节理边坡的破坏机制具有重要意义。

Generally, a segmental chip is formed in turning composites due to the effect of dynamic microcrack behavior.

由于切削变形区微裂纹动态形成的作用，超精密切削该材料时一般形成锯齿型切屑。

Microcrack density and damage predicted by the damage nucleation and evolution equations are functionals of the materical structural parameters.

由损伤形核律方程和损伤发展方程所确定的微裂纹密度和损伤是关于材料组织结构因素的泛函。

A comment of criterions of microcrack sliding is given; then a new sliding criterion in this thesis is put forward.

应用能量原理推导了张拉微裂纹的四阶均匀化刚度张量和四阶切线均匀化刚度张量。

The domain of microcrack growth is defined and used to describe the damage state of microcrack-weakened brittle materials. Based on this concept, the problems of micro-damage evolution and macro-constitutive response can be solved easily.

建议用微裂纹扩展区的概念来描述脆性材料的各向异性损伤状态，从而方便地解决了复杂加载路径下材料的细观损伤演化和宏观本构关系问题。

With the traditional ways microcrack type plastic damage can hardly be described and measured accurately.

它们难以准确描述和测量微裂纹型塑性损伤。

On the basis,the numerical response to micromechanics of material microst...

在此基础上，利用有限元法对异质体材料微结构进行细观力学响应的数值计算，对于识别"材料结构弱点"，评估微裂纹的启裂、扩展，预测异质体材料微结构材料损伤后的材料性能，推演"微结构虚拟失效"行为具有重要的意义。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。