BASIC CONCEPTS (INTRODUCTION)
ELASTICITY AND PLASTICITY
ELASTIC BEHAVIOUR OF SOLIDS
STRESS AND STRAIN
Types of Stress
Types of Strain
ElastomersSubstances like tissue of aorta, rubber etc. which can be stretched to cause large strains are called elastomers.
Elastic ModulusThe modulus of elasticity or coefficient of elasticity of a body is defined as the ratio of the stress to the corresponding strain produced.
Relation between Y, B, η and σ
ELASTIC POTENTIAL ENERGY
Elastic Potential Energy
Poisson’s RatioValue of σ lies between 0 and 0.5
APPLICATIONS OF ELASTIC BEHAVIOUR OF MATERIALS
(2) The metallic parts of the machinery are never subjected to a stress beyond elastic limit, otherwise they will get permanently deformed.
(3) The thickness of the metallic rope used in the crane in order to lift a given load is decided from the knowledge of elastic limit of the material of the rope and the factor of safety.