Sources of Stresses and Strains Depends on type of structure Aircraft

Let's first review a bit... from Unified, saw that there are basic considerations in elasticity: 1. Equilibrium 2. Strain-Displacement 3. Stress- Strain Relations (Constitutive Relations)

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

Now consider the case of compressive loads and the instability they can cause. Consider only static instabilities (static loading as opposed to dynamic loading [ e.g., flutter) From Unified, defined instability via a system becomes unstable when a negative stiffness overcomes

Thus far have considered separately beam - takes bending loads column -takes axial loads Now combine the two and look at the beam-column (Note: same geometrical restrictions as on others

延安大学：《结构力学 Structural Mechanics》课程教学资源（手稿）第四章 静定刚架课后作业答案

延安大学：《结构力学 Structural Mechanics》课程教学资源（手稿）第五章 三铰拱课后作业答案

《结构力学》课程授课教案（讲义）第九章 矩阵位移法 9.8 小结

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《结构力学》课程授课教案（讲义）第九章 矩阵位移法 9.6 等效结点荷载