thin shell element

The reason for generating the false stress in a transition element connecting a solid element to a thin shell element for stress analysis is considered.

分析了体&壳过渡元中产生“虚假应力”现象的根本原因，给出了两种改进方法。

In this paper, the tangent stiffness matrix, including load stiffness matrix, of a thin shell element with large defleCtions is derived, and the equilibrium path tracing method is introduced.

本文简要推导了包括荷载刚度矩阵在内的大变形等参数薄壳单元的切线刚度矩阵，并介绍了平衡路径的跟踪方法。

Most injection-molded parts are complicated thin-shell like structure, so the thin shell finite element method is usually used to analyze the warpage and deformation of the parts.

橡塑模具制品一般具有厚度方向尺寸较面内尺寸很小且形状复杂等特点，所以在对制品进行翘曲变形分析时，就可采用薄壳有限元法。

The similarities and differences between matrix theory and non-matrix theory are analyzed, and in accordance with the matrix theory, foundation of mechanical analysis on rotating thin shell and finite element method for internal forces of tower tube are discussed in the paper.

分析了有矩理论与无矩理论的异同点，并根据有矩理论，总结了旋转薄壳体的力学分析基础和塔筒内力的有限单元法。

3-D finite element analysis is done for the static and dynamic characteristics of large-scale prestressed U-shaped thin shell aqueduct with shell element and 3-D isoparametric element adopted.

采用壳体单元和三维等参单元，对大型预应力U型薄壳渡槽静动力特性进行了三维有限元分析，给出了静力分析结果，并与模型试验作了对比。

An axisymmetric shell element for both mid-thick and thin shells are presented.

推导了一种中厚壳和薄壳都运用的轴对称壳单元.

Generalized Conforming Flat Rectangular Thin Shell Element

广义协调平板型矩形壳元

A 4-Node, 24 Degree of freedom thin flat shell element based on the membrane-plate similarity theory

一个基于膜板比拟理论的四节点二十四自由度的平板壳单元

Then two schemes are presented to reduce the false stress in a transition element connecting an axisymmetric solid element to an axisymmetric thin shell element for axisymmetric stress analysis.

方案一是在采用体元应力应变模型的基础上提出了一种单元内位移、应变及应力的直接修改方法；

The response-displacement method and thin circular cylindrical shell finite element model are used for the analysis of earthquake stress at the T-joint of buried pipes. The numerical results are in good agreement with the experimental results, and some useful conclusions are obtained.

采用反应位移法和圆柱薄壳有限元模型对地下管道三通地震应力进行了分折.计算结果与实验结果吻合较好，得出了一些有益的结论。

In the aspect of thin shell element, the ultimate aim is to construct the shell element which can perform well in both membrane-dominated and bending-dominated situations, yet so far no widely accepted guiding theory or practicable method has been found.

在薄壳单元方面，根本目标是构造在膜变形和弯曲变形分别占主导的壳体考题中都有良好表现的壳单元，但至今没有非常明确的指导理论和实施方案。

In this paper, the static shape control of the flexible intelligent thin shell structure is derived by the intelligent thin shell element of Ref. [ 5]. Finally, a numerical example of a paraboloid antenna is given.

应用文献[5]给出的三维智能薄壳单元研究了柔性薄壳智能结构的静态形状控制问题，给出了抛物面形天线的静态形状控制算例。

Based on the explicit expressions a equivalent thin shell finite ring element of supporting columns of hyperbolic cooling towers is proposed by using equivalent stiffness method. The formula of the thickness of equivalent finite ring element and formulas of internal forces of supporting columns are given.

本文利用半解析环元刚度矩阵的显式结果，采用刚度等效的工程方法，直接将柱支撑等效为一个旋转薄壳环元，给出了该环元的等效厚度计算公式。

A variational formulation for elastic thin shell and its finite element approximation

弹性壳体的一种变分形式及其有限元逼近

The optimal shape control of flexible intelligent thin shell structure is derived by using the intelligent thin shell element presented.

利用三维智能薄壳单元，研究了柔性薄壳智能结构的动态最优形状控制；

Then with the guiding theory of the static-geometric analogy, a new methodology of thin shell element is presented. context is given and static;

平面弹性和板弯曲的相似性是壳体静力几何比拟的特例，所以在总的意义下本文就是研究基于板壳静力几何比拟理论的新型板壳单元列式。语境是事先存在的、静态的；

The feasibility of area coordinate quadrilateral thin shell element is elaborated, which improve analysis precision and efficiency of sheet metal forming. And the detail formulation is evolved.

论证了在动力显式有限元算法中应用面积坐标四边形单元模型的可行性，从而有效提高成形分析效率和精度。