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Elements and Performance Criteria

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.
   • Torque distribution diagrams are drawn and used to calculate torsional shear stress and angle of twist on threaded bolts subjected to torques.
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

Required skills

Look for evidence that confirms skills in 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

Look for evidence that confirms knowledge of stress and strain normal stress and strain modules of elasticity deformation Poissons 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

Evidence Required

The evidence guide provides advice on assessment and must be read in conjunction with the performance criteria required skills and knowledge range statement and the Assessment Guidelines for the Training Package
Overview of assessment	A person who demonstrates competency in this unit must be able to calculate stresses in simple structures as defined Competency in this unit cannot be claimed until all prerequisites have been satisfied
Critical aspects for assessment and evidence required to demonstrate competency in this unit	Assessors must be satisfied that the candidate can competently and consistently perform all elements of the unit as specified by the criteria including required knowledge and be capable of applying the competency in new and different situations and contexts
Context of and specific resources for assessment	This unit may be assessed on the job off the job or a combination of both on and off the job Where assessment occurs off the job that is the candidate is not in productive work then an appropriate simulation must be used where the range of conditions reflects realistic workplace situations The competencies covered by this unit would be demonstrated by an individual working alone or as part of a team The assessment environment should not disadvantage the candidate This unit could be assessed in conjunction with any other units addressing the safety quality communication materials handling recording and reporting associated with calculating stresses in simple structures or other units requiring the exercise of the skills and knowledge covered by this unit
Method of assessment	Assessors should gather a range of evidence that is valid sufficient current and authentic Evidence can be gathered through a variety of ways including direct observation supervisors reports project work samples and questioning Questioning techniques should not require language literacy and numeracy skills beyond those required in this unit of competency The candidate must have access to all tools equipment materials and documentation required The candidate must be permitted to refer to any relevant workplace procedures product and manufacturing specifications codes standards manuals and reference materials
Guidance information for assessment

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Range Statement

The range statement relates to the unit of competency as a whole. It allows for different work environments and situations that may affect performance. Bold italicised wording, if used in the performance criteria, is detailed below. Essential operating conditions that may be present with training and assessment (depending on the work situation, needs of the candidate, accessibility of the item, and local industry and regional contexts) may also be included.
Simple structures	Limited to consideration of centrally loaded bolted connections, fillet and butt welded connections
Reference materials	May include design manuals, handbooks, relevant codes and regulations, databases and manufacturers' references

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