What, in your opinion is the value of ritz's method? 1. Some. It is fraught with difficult make it almost impossible to apply to the challenging problems of design of moder aerospace structures

Principle of Virtual Displacements Consider a body in equilibrium. We know that the stress field must satisfy the differential equations of equilibrium. Multiply the differential equations of equilibrium by an \arbitrary\displacement field T

Unit #9 -Calculus of Variations Let u be the actual configuration of a structure or mechanical system. u satisfies the displacement boundary conditions: u=u* on Su. Define

Which of the following expressions most ac curately and simply represents the comple mentary strain energy density Uc of a linear elastic material?

我们先从一种最简单、最容易理解的图形开始分析技术形态。横线或称盘局,就是图形 之中最基本的形状。图表虽然浅显又简单但横线的含义与启示却十分重要,能够确认某种投 资是横线走势,密切观察,一但发现盘局发生变化,把握买入卖出讯号,利润可能以数倍计 图1中的阿城钢铁股价,由98年9月至12月初的走势基本呈一条横线的形状,价位在 4.5元左右,每日波动幅度不超过两三个价位,与12月中旬起逐步飙升至18元的行情不可 同日而语。9月至12月的图形形状就是“横线”,技术上又称盘局

Extend definition to material bodies: total work is the addition of the work done on all particles by forces distributed over the volume W by forces distributed over the surface t·udS

Which of the following expressions represents the rate of work done by the stresses during the deformation of a body of an arbitrary material?

properties of finite dement soltions Noded point equilibrio At a node, the sow of he elemeat nodal forces s in equilibriun with Hhe externed loads

How many quadrature points do you need to integrate a polynomial of order p= 3 exactly using Gauss'method

Concept Question How many quadrature points do you need to integrate exactly the stiffness matrix of a lD finite element with quadratic interpolation for the displacements? gauss