## BASIC DEFINITION

**Stress -**The strength of a material may be defined as the maximum resistance which a material can offer to the externally applied force .The strength of a material depends upon a number of factors type of loading ,temperature ,internal structure etc.

**Stress -**When some external force are applied to a body ,then the body offers internal resistance to these forces .The magnitude of the internal resisting force is numerically equal to the applied forces . This internal resisting force per unit area is called 'stress' .

**Strain -**It is defined as the change in length per unit length .

**Poisson's ratio -**When a material is subjected to longitudinal deformation then the lateral dimensions also charge .The ratio of the later strain to longitudinal strain is a constant quantity called the poisson's ratio .

lateral strain

Poisson's ratio = ------------------------

longitudinal strain

**Hooke's law -**This law states that within elastic limits, strain is proprotional to stress.**Bulk modulus -**It is defined as the ratio of uniform stress intensity to volumetric strain , within the elastic limits and is denoted by K.**Factor of safety -**Factor of safety defined as the ratio of the maximum stress to the allowable or working stress .SOM BOOK

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