There are many structural configurations where we do not have to deal with the full 3-D case. First let's consider the models Let's then see under what conditions we can apply them A. Plane Stress

Thus far we have discussed mechanical loading and the stresses and strains caused by that We noted, however, that the environment can have an effect on the behavior of materials and structures. Let's first consider:

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

石河子大学：《结构力学》课程教学资源（试卷习题）结构力学习题集2答案

石河子大学：《结构力学》课程教学资源（试卷习题）结构力学习题集1答案

石河子大学：《结构力学》课程教学资源（试卷习题）结构力学习题集2试题

石河子大学：《结构力学》课程教学资源（试卷习题）结构力学习题集1试题

延安大学：《结构力学 Structural Mechanics》课程教学资源（单元测试）第三单元 静定梁和静定刚架（答案）

§10.1 概述 §10.2 单元刚度矩阵（局部坐标系) §10.3 单元刚度矩阵（整体坐标)