应变

The relationship between stress and strain in a particular material is determined by means of a tensile test.

之间的关系应力和应变在一个特定的物质决心通过拉伸试验。

It established a finite element model of the parts on the intensity theoretical of metal fatigue basis, and carried on the structure of static analysis, dynamic analysis and fatigue analysis, and a lot of finite element method were used, then the distribution of the stress was got.

在金属疲劳强度理论的基础上，建立了该零件的有限元分析模型，对发动机支架的结构进行了静力分析、动力分析以及疲劳分析，应用了较多的有限元分析方法，得到该零件的应力、应变分布状态。

The basic theory of finite deformation is also studied in this paper's appendix, and the metric tensor for stress, strain and their equations between different configurations are derived.

本文还在附录中简要系统介绍了前人给出的有限变形基本理论，针对板料成形建立了应力应变度量张量及其相应的转换关系。

To establish the constitutive equation of material, the metric tensor for stress , strain and their transformation equations between different configurations are derived, and basic theory of finite deformation as well as elasto-plastic deformation criterion are studied. By analyzing the applicability of different element models, four-node quadrilateral degenerated Mindlin isoparametric element is adopted because of its good versatility, and the element stiffness matrix is derived. The static implicit elasto-plastic finite element equation for complex skin stretch-forming is put forward based on Updated Langrange formulation.

本文首先系统地阐述了有限变形的相关基本理论，针对板料成形建立了应力应变度量张量及其相应的转换关系；介绍了材料的屈服准则、塑性变形强化规律、塑性流动规律以及加、卸载准则，并在此基础上建立了有限变形各向异性弹塑性本构方程；对板料成形的单元模型进行了分析，针对飞机蒙皮零件特点，采用通用性强的四节点四边形退化Mindlin等参壳单元进行成形模拟，并导出其单元刚度矩阵的具体形式；基于以上研究，以逐级更新Langrange描述的持续虚功率原理为基础，建立了率形式的复杂蒙皮拉形过程静态隐式弹塑性有限元方程。

Neutral zone folds function: The function of this kind of folds is mainly happened in the mezzo forte terranes with relatively strong tenacity.

中和面褶皱作用：该类型褶皱作用主要发生在韧性差较大的岩石中强岩层内，其应变和变形具下述特点。

Some problems in micro- and nanoindentation are studied using finite element method based on CMSG theory.

这也是现在所有低阶应变梯度塑性理论所共有的问题。2。

The method of data acquisition and communication with PC are studied based on 8051 microcontroller.

以8051 单片机为核心，研究了应变检测系统的数据采集以及和上位机的通讯方法。

Therefore, the macro stress~strain characteristics may be explained by the microcrack mechanism of the framework exerted by the effective force.

因此，可以用岩石内部裂纹的生成演化和有效受力骨架变形与破坏机制来解释其宏观应力—应变特性。

B The micropipette aspiration technique was used to study the effects of cyclic stretching on the mechanical property of rat calvirial osteoblasts which were loaded at 500με, 1000μεand 1500μεrespectively with the frequency of 0.4Hz.

利用微管吸吮技术研究应变分别为500με、1000με和1500με，频率为0.4Hz的周期性拉伸刺激对大鼠颅盖骨中分离出的成骨细胞的力学特性的影响。

The results indicate that the flexural strength,the fracture energy and the fracture toughness of concrete will increase with the increasing of microsection fracture dimension.

混凝土的微观断面分数维与抗折强度、断裂韧度Kc和应变能释放率Gc有较好的线性关系，并回归得出相应的线性方程。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。