MEM30006A: Calculate stresses in simple structures (54 HRS)

Nominal Hours: 54 | Diploma/Adv Dip: Elective (Group 3) | Competency Based  
Assessment Plan A: (One Sem: 18 weeks) Updated Mar 2018

Task Topic Description and Link to Notes Quiz # Practice
Assess schedule Work Load% Must Pass

Simple Stress

10301 1 4 10 Y


10302 2 6 10 Y

Bolted Joints

10303 4 7 15 Y

Welded Joints and Pressure Vessels

10304 5 8 15 Y


10308 7 10 10 Y

Area Moments: Simple , Combined

10305 9 12 15 Y

Bending Moment

10306 12 15 10 Y
8 Bending Stress 10307 13 16 15 Y
9  Written Test:
  • Fully worked bolted joint problem
  • Fully worked beam problem, including Statics, FBD/SFD/BMD, Ixx, deflection
  • Various simple stress questions / thermal
Exam - - - 17 - -
- TOTAL - - - - - 100 -

Quiz = Computer Based Testing: Typically consists of practice mode (iTester) and assessment mode (Moodle).
Exam = Written test submitted on paper, all working shown neatly.

*Where applicable.



(CAUTION: This subject contains most of MEM30006A Stresses, so you should do both together) Assessment is a combination of multiple choice tests, written tests, and submitted reports (print/email).

  • Lab Reports: Specification for lab reports. (Including error analysis where required)
  • Project Reports: Specification for project reports.
  • TESTER tasks: Computer based learning and assessment using the TESTER program.
    Procedures and rules. For most computer-based assessments, homework must be presented before Tester (exam mode) can be attempted.  In some cases, certain programs (e.g. Excel) are excluded from running with Tester during an exam. 

When you have completed this unit of competency you will have developed the knowledge and skills to determine the resultant and equilibrant of systems of forces, in one plane, then determine nominal sizes for a simple horizontal beam subject to a combination of uniform and point loadings.

Required Text

Text book Subjects Picture
Ivanoff, Val
Engineering mechanics: An introduction to statics, dynamics and strength of materials
ISBN 0074702394
RRP $80.95 (June 2009)
  • Forces (Statics)
  • Dynamics
  • Stresses

Formula Sheet

Large size (900x1208)

Full Size (2416x3244)

Edits: 20200511 Added Torsion diameter formula.


Unit MEM30006A: Calculate stresses in simple structures (54 HRS)

(CAUTION: This subject is strongly dependent on MEM30005A Forces, so you should do both together.
Preferably complete most of Forces first before starting Stresses)
This unit covers determining stresses and their effect on the strength and stability of simple structures and mechanical components.  

1. Determine stresses in simple structures and mechanical components


The shear stresses in simple bolted connections are determined.



The nominal weld size or length of weld required on simple welded connections is determined to meet load requirements.

1.3 The nominal weld size or length of weld required on simple welded connections is determined to meet load requirements.

2. Verify stress levels using appropriate reference material 


Appropriate reference materials are used to verify that stress loading is acceptable and in accordance with standard operational procedures.



Verification results are reported according to standard operational procedures.

Required skills 

  • interpreting drawings and graphical representations
  • calculating stresses using given formulas
  • construction of torque distribution diagrams
  • accessing relevant codes and reference material
  • interpreting results against reference materials


Required knowledge

  • stress and strain
  • normal stress and strain
  • modules of elasticity
  • deformation
  • Poisson's Ratio
  • shear stress and strain
  • modulus of rigidity
  • yield stress, ultimate stress, proportional limit, factor of safety, allowable stress
  • centrally loaded connections
  • bolted connections
  • shear, tensile, torque and bearing stresses
  • centrally loaded welded connections
  • fillet and butt welds, method of failure
  • size and length of weld
  • effect of hole punching longitudinal stress
  • how to access and use relevant codes and reference material

Schedule: MEM30005A Calculate Force Systems Within Simple Beam Structures

1. Stresses

  • axial tension and compression
  • normal stress and strain
  • Hooke's law and modulus of elasticity
  • Poisson's ratio
  • factor of safety
  • direct shear
  • shear stress and strain
  • modulus of rigidity
  • single and double shear in pins
  • punching of holes in plates
  • bolted connections
  • bolted joints, centrally loaded
  • shear and bearing stresses in bolts
  • tension in bolted plates
  • welded connections
  • Welded joints centrally loaded
  • Butt welds - tensile stress
  • Fillet weld - shear stress
  • Weld size and length
  • Shear and bending in beams
  • Shear force and bending moment diagrams
  • Simply supported and cantilever beams
  • vertical point loads
  • uniformly distributed loads
  • bending stresses
  • bending stresses in beams
  • beam deflections
  • standard formulas
  • torque distribution diagrams
  • torsional shear stress 
  • angle of twist on threaded bolts
  • friction
  • thermal stress

2. Stress levels

  • reference materials
  • standard operational procedures
  • verification 

Teaching and Learning Resources
  • Unit Resource Manual for this unit of competency.
  • Textbook:  Ivanoff, V; Engineering Mechanics; McGraw-Hill, Sydney, 1996