Flashcards
Materials Lecture 9+3
Cards in this deck (7)
- 1To avoid selection of the wrong classification of material (e.g. class of Aluminium), what do we need?Comprehensive set of data with info for metals, polymers, ceramics and polymers
Capability to rank and allow rational selection of materials for a given product - 2What stages are there in selecting a material?Function
Constraints
Objectives
Free Variables - 3Select a material for a safety helmetFunction - facial protection from impact
Constraints - Transparent and mouldable and if possible low cost
Objectives - tough as possible
Free variables - Material in used doesn't have to be a specific one, just one that meets the criteria - 4What symbol indicates fracture toughness?Kc
- 5What is fracture toughness?Ability of a material to resist against crack propagation
- 6If you were selecting materials for high velocity impact helmet and for a workshop visor to protect face from dust what would be the material you would pick for each of them?Helmet - Polycarbonate
Visor - Cellulose Acetate - 7What are the steps in getting to the material index equation?m=A.L.(density)
F(failure)/A=Failure Stress
Eliminating A:
m=F.L.[(density)/(failure stress)]
Lightest tie is a material with smallest:
[(density)/(failure stress)]
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- Description
- Uni Materials Flashcards on Materials Lecture 9+3, created by Luke Hansford on 10/04/2016.
- Created by
- Luke Hansford · Apr 2016
- Updated
- May 18, 2016
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