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

Why is the element stiffness matrix singular in a finite element formulation? 1. So that it can accomodate rigid element dis- placements without introducing spurious nodal 2 Because we made a mistake in the formula- tion the stiffness matrix should not be sin- g 3. Because we havent enforced any displace ment boundary conditions(it's a variational approach after all) Statement(1)

Unit #10- Principle of minimum potential energy and Castigliano's First Theorem Principle of minimum potential energy The principle of virtual displacements applies regardless of the constitutive law. Restrict attention to elastic materials(possibly nonlinear). Start from the Pvd

5. 19 Reaction between Dislocation Condition 1. Geometrical condition

1概 2S0炉气的制造 3炉气的净化与干燥 4二氧化硫的催化氧化 5三氧化硫的吸收 6用其它含硫原料制硫酸 7三废处理

6. 8 Diffusion Mechani sm Flick's' law in microscopic form 1. One dimensional diffusion. jump frequency period probability of atom jumping to nearest position

1. Classification y Ideal or perfect crystal real or defect crystal According to dimension o point defect: vacancies, interstitial atoms s line defect dislocation planar defect: stacking fault o volume defect mosaic structure

3. 1 Basic concepts of al loys 1. Definition An alloy is the combination of metal(s) with other elements through chemical bonding. Termino logy

1. Have you or your friend ever been cheated by a manufacturer? Describe your experience to your partner. Reference: Yes. Last year I planned to buy a computer so I could surf the net. I want to find a cheap one that's attractive and eas sy to use. I found

数据库技术的演化(2) 1980s晚期: 各种高级数据库系统(扩展的关系数据库面向对象数据库等 等)