查询词典 plastic deformation

The influence of indentor radius on the plastic deformation has been discussed and some important results are as follows:(1) The influence of the ratio of ceramic coating thickness to indentor radius on the failure of coating, plastic deformation of substrate and crack propagation are obvious.(2)The propagation of crack in ceramic coating is assumes to be of semi-elliptical shape under normal contact with a rigid sphere.(3)Fatigue life of ceramic coating is mainly decided by substrate and load, the lower substrate elastic moduli and load, the more cycles of fatigue.

分析了压头半径对塑性变形的影响，模拟结果表明；(1)陶瓷涂层厚度和压头半径之比对涂层失效、基体塑性变形及裂纹的形成有显著影响；(2)在刚性球压头静态挤压条件下，陶瓷涂层中的预制裂纹按照椭圆形裂纹规律扩展；(3)陶瓷涂层的疲劳寿命与基体和载荷有很大关系，基体弹性模量越小，疲劳寿命延长。

The planning of the processing parameter is based on the plastic deformation of the metal because the planning of the cold rolling technique is affected by the ability plastic deformation of the metal. Industrial PC is the master processor of the cold rolling machine. The process of cold rolling monitored by the corresponding functional component real-timely.

冷辗工艺的设计受金属塑性变形能力的影响，因此工艺参数设计以金属塑性变形为基础；冷辗机控制系统以工业PC为主控制器，通过相应的功能模块实现对冷辗进程的实时监控。

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。

The severe plastic deformation on 1060pure aluminum at room temperature was carried outby accumulative roll-bonding, the microstructure evolution and mechanics performance change of 1060 industry pure aluminum before and after plastic deformation were studied.

采用累积叠轧焊方法在室温下对1060纯铝进行剧烈塑性变形，并分析1060纯铝变形前后内部微观组织结构的演变和力学性能的变化。

Using the Updated Lagrange finite element method and the elastic-plastic large deformation finite element formula based on virtual work-rate principle of finite deformation, the author studies in detail the plastic flow rule of MPF, including the influence of the work hardening index, friction, thickness of sheet, material, number and position of the punch.

作者采用逐级更新Lagrange法以及有限变形虚功率增率原理的弹塑性大变形有限元法，详细研究了金属板材多点成形的塑性流动规律，包括加工硬化指数、摩擦系数、板料厚度、材料、冲头个数及位置等对成形的影响，同时探讨了分段成形时的金属流动规律。

Accordingly, it is known that slip forming concrete is the elasto-viscous and plastic material mainly having strain-softening characteristic, and there are elastic deformation, rigid slide, elastic after-effect, delayed elastic deformation, stress relaxtion, creep and plastic-viscous flow in its rheological process.

据此得知：滑模成型混凝土是以应变软化为主的弹粘塑性材料，其流变过程中将产生弹性变形、刚性滑移、弹性推迟、弹性后效、应力松弛、蠕变和塑粘流动。

In the second part, the theory of numerical simulation is introduced, including description of body configuration, elastic-plastic large deformation constitutive equation and finite element formula. It is followed by the derivation of equation from the basic theory of elastic-plastic deformation. The solution to temperature field, thermal stress, thermal strain, equivalent effective stress and equivalent strain is achieved then. In addition, we exposit the relation between machine load and thermal load in coupling analysis.

介绍了物体的构形及其描述，弹塑性大变形的本构方程、有限元列式；并进一步论述了弹塑性变形的基本理论，推导了弹塑性方程组；阐述了温度场的求解、热应力及热应变的理论概要，说明了等效应力与等效应变，并进一步阐明了在热力耦合分析中，机械负荷与温度负荷之间的关系；此外，还简介了Marc AutoForge程序结构的特点。

Not the transformation stress but the initial toughness is the controlled factor for the roughening behavior of free surface during plastic deformation. This phenomenon is discussed in terms of geometrical and physical effect of plastic deformation.

而且初始表面初粗度，而不是相变应力是控制表面粗糙化速率的主导因素；用变形的几何作用和物理作用对此进行了解释。

The activation energy for deformation in W18Cr4V high speed steel, 40CrMnNiMo tool steel for plastic molding and AISI H13 hot-work tool steel are investigated intensively. The investigation shows that the activation energy for deformation of both 40CrMnNiMo tool steel for plastic molding and AISI H13 hot-work tool steel decrease with the increasing of temperature.

分别将这两种钢的变形激活能数学模型用于蠕变模型，并采用这一改进后的蠕变模型对W18Cr4V高速钢和40CrMnNiMo塑模钢的热变形流变应力进行预测，结果表明，此模型不仅能精确描述蠕变条件下工模钢的流变应力变化规律，也能精确描述工模钢非蠕变条件下的流变应力。

Considering the problems of spurgear precise plastic forming, such as high deformation resistance, poor flowability and especial hardness to fill cant of gear, technological plan was developed based on precise plastic forming technique, successive control principle and consecutive local deformation theory. Moreover, structures of the rolling preform die and the die with up and down wellrounded forcer for stamping-extrusion and bulge-extrusion combining forming were designed too.

因此本文的主要研究内容和结果如下：本文以某种直齿轮：模数m＝2，齿数z＝20，压力角α＝200，变位系数x＝0为对象，针对直齿轮精密塑性成形变形抗力大，流动性差，特别是成形中齿轮角隅部分更加难以充满问题，基于精密塑性成形技术、逐次控制原理以及连续局部变形原理提出了&直齿轮滚轧制坯－镦挤、胀挤复合精成形&的工艺方案，设计了滚轧制坯的模具结构和上下冲头带圆角的镦挤、胀挤复合精成形的模具结构。

Now she was hungry and angry.She began to smoulder.

现在她又饿又气，她开始流露难以抑制的怒火。

You have placed our iniquities before You, Our secret sins in the light of Your presence.

诗90：8 你将我们的罪孽摆在你面前、将我们的隐恶摆在你面光之中。