Return to the simplest system the single spring-mass This is a one degree-of-freedom system with the governing equation

The logical extension of discrete mass systems is one of an infinite number of masses. In the limit, this is a continuous system. Take the generalized beam-column as a generic representation:

Summarizing what we've looked at in elasticity, we have: 15 equations in 15 unknowns 3 equilibrium -6 strains -6 strain-displacement -3 displacements

As we've previously noted, we may often want to describe a structure in various axis systems. This involves... Transformations (Axis, Deflection, Stress, Strain, Elasticity Tensors) e.g., loading axes material principal axis Figure 7.1 Unidirectional Composite with Fibers at an Angle

Sources of Stresses and Strains Depends on type of structure Aircraft

Recall the definition of stress: o stress =\intensity of internal force at a point\ Figure 3.1 Representation of cross-section of a general body

一、公关调查.r .. Research 二、公关策划P.r .. Planing 三、公关实施P.r .. Communication 四、公关评估P.r.Evaluation 五、四大步骤形成环状结构一“RPCE”循环

一、重点:水螅体壁的各种细胞的结构和功能。 二、难点:海产腔肠动物发育的世代交替现象

1.1生命活动 1.2动物的生活环境和生存方式 1.3动物体的结构功能水平 1.4动物的体形 1.5动物的发育 1.6动物分类基本知识 1.7化石和地层年代

一、特点 二、分类 三、编程器使用