# Strength of Materials

### Principal stress, Principal plane & Mohr's circle analysis

### Understanding Von Mises stress

### Theories of Failure

Concepts of principal stress and plane form backbone of material stress analysis. Purpose of this video lecture is to give you a good introduction to concept of Principal stress, Principal plane and Mohr’s circle analysis.

Von mises stress is widely used by designers to check whether their design will withstand given load condition. In this lecture we will understand Von mises stress in a logical way.

Good understanding of theories of failure are imperative in design of civil structures or mechanical equipments. This lecture will give you a good introduction to theories of failure.