**SIMPLE STRESSES AND STRAINS:**

Concept of stress and strain- St. Venant’s Principle-Stress and Strain Diagram – Elasticity and plasticity

– Types of stresses and strains- Hooke’s law – stress – strain diagram for mild steel – Working stress

– Factor of safety – Lateral strain, Poisson’s ratio and volumetric strain – Pure shear and Complementary shear – Elastic modulii, Elastic constants and the relationship between them – Bars of varying section – composite bars – Temperature stresses .

**STRAIN ENERGY **– Resilience – Gradual, sudden, and impact loadings – simple applications.