Machine Design


Machine Design is the branch of engineering mechanics relating to the study of engineering stresses and strains in mechanical systems. A part or component of a machine fail when the stress induced by either the static and dynamic loading exceed its allowable stiffness or strength. This module presents the engineering fundamentals necessary to analyse static and/or fatigue stresses.

Learning Outcomes

  1. Construct Shear Force Distribution (SFD) and Bending Moment Distribution (BMD) diagrams to calculate maximum flexure stresses present in bending beams under a variety of loading conditions

  2. Calculate the principal and shear stresses and their directions on a stress element subjected to a bi-axial stress system.

  3. Construct Mohr's circle of stress for bi-axial load systems.

  4. Design mechanical components subjected to static loading and predict failure based on different failure theories for ductile materials (such as Maximum Normal Stress Theory, Maximum Shear Stress Theory and Distortion Energy Theory) and brittle materials (such as Rankine Theory and Mohr Hypothesis).

  5. Apply the laws of Linear Elastic Fracture Mechanics (LEFM) to predict failure.

  6. Calculate the fatigue life of a structural element subjected to sinusoidally varying loads (e.g. bending, torsional, axial)

  7. Analyse the effect of different types of stress concentrations on a component's (1) ability to withstand static loads and (2) service life under fatigue loading

  8. Design mechanical and machine components (e.g. screws, bolts, gaskets, fasteners, springs, bearings and shafts) which are to be subjected to static and fatigue loading

% Coursework 55%
% Final Exam 45%