Credit  6 points  
Offering (see Timetable) 
 
Details for undergraduate courses 
 
Content  This unit focuses on the relationship between stress and strain in solid, deformable, loadcarrying structural and mechanical elements. Various types of loading such as tension, compression, bending, shear and torsion is considered as well as common failure modes and models. Design of structural and mechanical elements to withstand defined static loads is also covered. The objective of the unit is to develop an understanding of equilibrium, stress, strain, deformation and stability of 2D and 3D statically determinate and indeterminate structures, and to provide an introduction to the methods of analysis for design of structural and mechanical elements. The following major topics will be covered: (1) concept of stress  tension, compression and shear; (2) stress and strain in 3D, generalised Hookes's law; (3) axially loaded members; (4) torsion; (5) shear forces and bending moments; (6) stresses in beams; (7) analysis of stress and strain; (8) applications of plane stress (pressure vessels, beams and combined loadings); (9) statically indeterminate beams; and (10) column buckling and stability.  
Outcomes  Students are able to (1) choose references and sources of information relevant to the unit activities and use them to find relevant examples/information; (2) understand equilibrium conditions as applied to the analysis of structural and mechanical elements; (3) calculate reaction forces on a loaded element and draw normal force, shear force, torque and bending moment diagrams; (4) understand the relationship between stress and strain (Generalised Hooke's Law) in two dimensions and three dimensions; understand the relationship between Poisson's ratio, Young's modulus, shear modulus and bulk modulus; (5) calculate the normal stress and shear stress in structural elements induced by multidirectional loading; (6) understand the effects of different boundary conditions on the stress distribution in a loaded element; (7) understand the concept of stress concentration and its application to design; (8) assess crosssectional properties and their effect on structural response to loading; (9) understand the stress/strain transformation, represent it using Mohr's circles and apply these and understand (including the mathematical bases) the concept of principal stress/strain and determine principal stress/strain in simple components under various types of loading; (10) understand the difference between ductile and brittle materials, and the choice of appropriate failure models; (11) understand and apply ideal (Euler's) column buckling model and stability criteria; and (12) apply the above to analyse the stress/strain state in simple mechanical components and interpret the results in terms of risk of the component failure.  
Assessment  Typically this unit is assessed in the following ways: (1) individual and/or group assignments; (2) a midsemester examination; and (3) a final examination. Further information is available in the unit outline. Supplementary assessment is not available in this unit except in the case of a bachelor's pass degree student who has obtained a mark of 45 to 49 overall and is currently enrolled in this unit, and it is the only remaining unit that the student must pass in order to complete their course.  
Unit Coordinator(s)  Professor Elena Pasternak  
Unit rules 
 
Contact hours  inclass lectures (including continuous assessment): 3 hours a week (total 39 hours); tutorials: 24 hours (total)  
Unit Outline  http://www.unitoutlines.ecm.uwa.edu.au/Units/ENSC3004/SEM1/2017  
Note  Enrolled students can access unit materials via the LMS (Learning Management System).  
Recommended reading 
Beer, F. P. et al. Mechanics of Materials, 6th edn: McGrawHill 2012
 
