ENGG(SERC) 3-915: Advanced Fatigue and Fracture mechanics (L-T-P-C) :3-0-1-3

Faculty: Dr. G.S. Palani;

Introduction to deformation behavior: Concept of stresses and strains, engineering stresses and strains, Different types of loading and temperature encountered in applications, Tensile Test – stress – strain response for metal, ceramic and polymer, elastic region, yield point, plastic deformation, necking and fracture, Bonding and Material Behaviour, theoretical estimates of yield strength in metals and ceramics; Yielding and Plastic Deformation: Hydrostatic and Deviatoric stress, Octahedral stress, yield criteria and yield surface, texture and distortion of yield surface, Limitation of engineering strain at large deformation, true stress and true strain, effective stress, effective strain, flow rules, strain hardening, Ramberg-Osgood equation, stress – strain relation in plasticity, plastic deformation of metals and polymers; Deformation under cyclic load – Fatigue: S-N curves, Low and high cycle fatigue, Life cycle prediction, Fatigue in metals, Notch effects, residual stress effects, fatigue under variable amplitude loading; Crack-tip Stress and Displacement Field Equations:Airy’s Stress function for Mode-I, Westergaard Solution of Stress Field for Mode-I, Displacement Field for Mode-I, Relation between KI and GI, Stress Field in Mode-II, Generalised Westergaard approach, William’s Eigen Function Approach, Multi-parameter Stress Field Equations, Validation of Multi-parameter Field Equations; Experimental Techniques: Fractrographic studies, Using special gauges, Photo Elasticity, Acoustic Emission techniques, Compliance Measurements , ACPD technique, Digital Image correlation.