21773 version 2
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Demonstrate and apply knowledge of mechanical statics for mechanical
engineering
Level
4
Credits
15
Purpose
People credited with this unit standard are able to: describe given concepts in
mechanical statics; apply mechanical statics principles to specified
applications; and apply stress and strain principles to steel components.
Subfield
Mechanical Engineering
Domain
Applied Principles of Mechanical Engineering
Status
Registered
Status date
27 October 2005
Date version published
19 March 2010
Planned review date
31 December 2015
Entry information
Open.
Replacement information
This unit standard and unit standard 21774 replaced unit
standard 11388 and unit standard 11389.
Accreditation
Evaluation of documentation and visit by NZQA.
Standard setting body (SSB)
Competenz
Accreditation and Moderation Action Plan (AMAP) reference
0013
This AMAP can be accessed at http://www.nzqa.govt.nz/framework/search/index.do.
Special notes
All activities must comply with: any policies, procedures, and requirements of the
organisations involved; the ethical codes and standards of relevant professional bodies;
and any relevant legislative and/or regulatory requirements which may include but are not
limited to the Health and Safety in Employment Act 1992, and its subsequent and
delegated legislation.
 New Zealand Qualifications Authority 2016
21773 version 2
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Elements and performance criteria
Element 1
Describe given concepts in mechanical statics.
Range
concepts – statics, equilibrium, forces, vectors, stress, strain.
Performance criteria
1.1
Concepts are described in terms of main features, purpose, and use.
1.2
Supporting practical examples provide valid illustrations of the concepts.
Element 2
Apply mechanical statics principles to specified applications.
Performance criteria
2.1
The principles of forces, moments, and couples are applied to specified
applications.
Range
applications – coplanar force systems, loading of beams,
frameworks, centres of gravity.
Element 3
Apply stress and strain principles to steel components.
Performance criteria
3.1
Direct stress, indirect stress, and direct strain calculations are performed to
determine the suitability of components for use.
3.2
Torsional stress and strain calculations are performed to determine the
suitability of solid and hollow sections for use.
3.3
Determined working stresses conform with published allowable stresses for
given types of loading, fixing, and factors of safety.
Range
3.4
published allowable stresses – manufacturers’ and/or material
suppliers’ data.
Second moments of area are calculated on the basis of determined working
stress and/or allowable working stress.
 New Zealand Qualifications Authority 2016
21773 version 2
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Please note
Providers must be accredited by NZQA, or an inter-institutional body with delegated
authority for quality assurance, before they can report credits from assessment against
unit standards or deliver courses of study leading to that assessment.
Industry Training Organisations must be accredited by NZQA before they can register
credits from assessment against unit standards.
Accredited providers and Industry Training Organisations assessing against unit standards
must engage with the moderation system that applies to those standards.
Accreditation requirements and an outline of the moderation system that applies to this
standard are outlined in the Accreditation and Moderation Action Plan (AMAP). The
AMAP also includes useful information about special requirements for organisations
wishing to develop education and training programmes, such as minimum qualifications for
tutors and assessors, and special resource requirements.
Comments on this unit standard
Please contact Competenz info@competenz.org.nz if you wish to suggest changes to the
content of this unit standard.
 New Zealand Qualifications Authority 2016