1. Mechanical Engineering and Solid Mechanics
CHAPTER 10
Mechanical Engineering and Solid Mechanics

2. Objectives Sections 10.1 Introduction
Differentiate between the different types of basic loading conditions.
Understand how extension of a bar is associated with lateral contraction of the same bar
Apply Hooke’s Law to basic loading conditions
Sections
10.1 Introduction
10.2 Tension, Compression, Shear, and Torsion
10.3 The Poisson Effect
10.4 Hooke’s Law
10.5 Summary

3. 10.1 Introduction
Given all loads/moments on the given body, to determine deformation (deflection) and stresses.
We may also find the allowable loading when failure may occur
A body is loaded, it deforms; but upon complete unloading body may either return back to its original state
Then it is elastic- Else Inelastic (plastic)

4. 10.2 Tension, Compression, Shear, and Torsion

5. Shear Force
A body under shear will have an angle change

6. Shear Stress Example

7. 10.3 Poisson Effect
When a body is under tension, the length increases but width (or diameter decreases and this effect is called Poisson’s effect.

8. 10.4 Hooke’s Law In 1678, Hooke postulated
E is Youngs modulus in Msi,( psi) or Gpa (Giga pascals).
Example