# 材料的机械性能 2：应力转换、梁、柱和多孔固体

## Mechanical Behavior of Materials, Part 2: Stress Transformations, Beams, Columns, and Cellular Solids

Explore materials from the atomic to the continuum level, and apply your learning to mechanics and engineering problems.

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edX
• 完成时间大约为 4
• 中级
• 英语

### 你将学到什么

Concepts relating to stress transformation, including equivalent stresses, principal stresses, and maximum shear stress

How to solve stress transformation problems using Mohr’s circle

How to solve problems relating to beam bending and column buckling

How the stiffness and strength of cellular materials depend on their mechanisms of deformation and failure

### 课程概况

All around us, engineers are creating materials whose properties are exactly tailored to their purpose. This course is the second of three in a series of mechanics courses from the Department of Materials Science and Engineering at MIT. Taken together, these courses provide similar content to the MIT subject 3.032: Mechanical Behavior of Materials.

The 3.032x series provides an introduction to the mechanical behavior of materials, from both the continuum and atomistic points of view. At the continuum level, we learn how forces and displacements translate into stress and strain distributions within the material. At the atomistic level, we learn the mechanisms that control the mechanical properties of materials. Examples are drawn from metals, ceramics, glasses, polymers, biomaterials, composites and cellular materials.

Part 1 covers stress-strain behavior, topics in linear elasticity and the atomic basis for linear elasticity, and composite materials.

Part 2 covers stress transformations, beam bending, column buckling, and cellular materials.

Part 3 covers viscoelasticity (behavior intermediate to that of an elastic solid and that of a viscous fluid), plasticity (permanent deformation), creep in crystalline materials (time dependent behavior), brittle fracture (rapid crack propagation) and fatigue (failure due to repeated loading of a material).

### 课程大纲

Week 1: Equivalent stresses for varying orientations Principal stresses, maximum shear stress Mohr’s circles Week 2:  Stresses in beams Shear and bending moment diagrams in beams Strain energy Week 3: Beam deflection Column buckling Cellular solids Week 4:  Final Quiz

### 预备知识

Classical mechanics (or statics)
Chemistry at the first-year university level
Differential equations
3.032.1x, or an equivalent course in the elastic behavior of materials

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