The aim of the module is to provide the student with an in-depth analysis of stress and strain in engineering design, and the heat treatment of materials.
Stress Analysis in Design: Brief review of methods of statics. Free body diagrams. Equations of equilibrium. Loading and normal stress. Shear and bearing stress. Loading and normal strain. Shear strain. Hooke’s law, stress-strain diagram. St Venants principle. Stress concentration factors. Transformation of plane stress and strain. Principal stress and strain. Mohr’s circle for plane stress and strain. Measurement of strain, strain rosettes.
Failure Mechanisms: Stability of columns. Euler’s formula for various column end conditions. Bending in beams, stress due to bending. Introduction to fracture mechanics, crack propagation. Critical length of crack. Fatigue introduction, S-N diagrams. Torsion, angle of twist. Stress in spherical and cylindrical thin walled pressure vessels.
Elements of Machine Design: Loading & Stress in Gear Teeth. Spur gears, belts and chains. Stress, stress concentrations in shafts, power transmission in shafts. Keys, keyways and splines. Torque transfer elements. Gear construction, gear trains. Force analysis of spur and helical gears. Power screws and Fasteners.
Heat Treatment: Properties of low, medium and high carbon steels. Steel manufacturing and recycling. Simplified iron-carbon phase diagram. Direct heat treatment of steel. Surface hardening of steel. Ferrous metal heat treatment processes
Engineering Standards: Design safety factors. Material data sheets and design specifications. Engineering standards bodies and recommendations. Health, safety and environmental legislation relevant to mechanical engineering design.
