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Summary Unit 25 – Mechanical Behaviour of Metallic Materials Assignment 3 £13.49
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  2.  
  3. PEARSON (PEARSON)
  4.  
  5. Engineering 2016/2017 NQF
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  7. Unit 25 - Mechanical Behaviour of Metallic Materials

Summary

Summary Unit 25 – Mechanical Behaviour of Metallic Materials Assignment 3
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This document is a summary of assignment 3 for Unit 25 – Mechanical Behaviour of Metallic Materials. This document has information of mechanical behaviours and types of mechanical failures that are present and ways how to avoid them

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  • January 25, 2023
  • January 25, 2023
  • 60
  • 2020/2021
  • Summary

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  • unit 25
  • unit 25 – mech behaviour of metallic materials assignment1
  • unit 25 – mech behaviour
  • unit 25 – mech behaviour of metallic materials assignment 1
  • unit 25 – mechanical behaviour of metallic mater

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,
,Draw graph for this tensile test?
5mins

,Identify the straight line part of the graph.

, Learning Objectives
At the end of this session, you should be able to:

 Define failure
 Describe how failure occurs
 Describe various mode of failure
 Discuss how to prevent or minimise failure in service.
 Evaluate a case study and recommend why failure was not prevented

, Class Activity 1- 5mins
Failure of Metallic Materials

• Why is it that we do not want metallic materials to fail
in service?

, Solution

• We don’t want engineering materials to fail because……they
can cause loss of life, economic loss or a loss of products or
services.


• The usual causes of material failure are incorrect materials
selection, incorrect processing, incorrect manufacturing
procedures, inadequate design or incorrect use.

, How do Materials Break?
• Ductile vs. brittle fracture
• Principles of fracture mechanics
• Stress concentration
• Impact fracture testing

, Mode of failures
• Fatigue (cyclic stresses)
• Cyclic stresses, the S—N curve ( a plot of stress (S) against the
number of cycles to failure (N),
• Crack initiation and propagation
• Factors that affect fatigue behaviour
• Creep (time dependent deformation)
• Stress and temperature effects
• Alloys for high-temperature use

, Definition of key terminologies
• Fracture: separation of a body into pieces due to stress, at
temperatures below the melting point.
Steps in fracture:
• crack formation
• crack propagation
Depending on the ability of material to undergo plastic
• deformation before the fracture two fracture modes can be
• defined - ductile or brittle

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