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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。

This site is growing every day, with new mineral information, localities and photographs added by members - whether you are interested in mineral collecting, a student or a professional mineralogist why not join so you can keep the site updated with information on areas you are familiar with.

网站每日都在成长壮大，因为会员不断上传刷新矿物和矿山信息，以及矿物图片。不论您是学生还是矿物学教授，都热忱欢迎您的加入并对您感兴趣的话题提出宝贵意见！

Rosen projective gradient method is used to find the approximated KKT points of relaxed problem, and then the index set is updated until the minimal solution is .

本文采用Rosen 投影梯度法求此松弛问题的近似KKT点，然后更新指标集不断迭代直至得到最优解。

In recent years due to the rapid development of science and technology, plastic Plastic products industry research and development of materials have been updated, and market competition, quality demanding, the company's various processing equipment machinery continued innovation from the traditional human operation of the plant to the improved automatic equipment from the processing quality of the basic requirements to The most stringent test data, I must in the field of technology and management create more efforts to meet the needs of loyal customers.

近年来由于科技的突飞猛进，塑胶产品行业的材料也不断研发更新，加上市场竞争、品质苛求，本公司的各种加工设备机器不断推陈出新，从传统人力操作的机台到改良型全自动设备；从加工品质的基本要求到最严苛的数据检验标准，我公司必须在技术领域与管理制造上更加努力不懈，以满足忠实的客户需求。

Today was Updated the multi-window browser greenBrowser, which is based on the core internet explorer and which has a large quantity of additional possibilities.

今天更新的多窗口浏览器greenbrowser，它的核心是基于探索者和拥有大量增加的可能性。

It is the most important to do a website hold to namely and updated.

做网站最重要的就是坚持和更新了。

The validation of ~(12)C evaluation for the updated database CENDL-3.1 was performed with neutron angular flux experiment in this paper.

在此基础上，建立了30MeV以下入射能区的中子评价核数据库，并截取20MeV以下能区的数据建立了更新版中子评价核数据库CENDL-3.1版。

When using gmail, I noticed that the Tab Title is not updated when a new mail is available.

当使用Gmail时，我发觉统计表的标题是没有更新的时候，一个新的邮件资料。

A game series can not be completely stereotypes, the stereotypes he really is dead, but fortunately we did not see the glorious江郎才尽, regardless of wine a new bottle or new wine in old bottles, in several elements SLG constantly updated portfolio, and finally come up with a products..

一个游戏系列不可能完全定型，真的定型了那他也就死了，幸好我们没看到光荣江郎才尽，无论新瓶装老酒还是老瓶装新酒，在几种SLG要素不断组合更新后，终于出了一个精品。。

This is particularly useful for blogs or other newsy web sites that are updated regularly.

这是特别有用的博客或其他newsy网站，定期更新。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。