Module 1: Introduction to Engineering Materials

Kyan Clay
Flashcards by Kyan Clay, updated more than 1 year ago
Kyan Clay
Created by Kyan Clay about 5 years ago
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Description

MEC1201 Materials Engineering Flashcards on Module 1: Introduction to Engineering Materials, created by Kyan Clay on 27/02/2016.

Resource summary

Question Answer
Nominal stress Force acts normal to object Nominal stress = Force/Original Area
Types of deformation Elastic (apparent only whist load is applied) Plastic (permanently deformed)
Yield/proof strength transition point from elastic to plastic deformation - 0.2% plastic deformation!
Brittle characteristics - fail at end of elastic deformation - britility changes with temperature
Hardness resistance to PERMANENT deformation tested using small steel ball, pressed into material (indent size measured)
Fatigue testing Use fluctuating and reversing loads
Creep testing A creep test involves a tensile specimen under a constant load maintained at a constant temperature. Measurements of strain are then recorded over a period of time.
Modulus of Elasticity Measure of stiffness E = Stress/Strain
Proportional Limit Linear stress/strain relationship no longer holds
Endurance limit value of stress reversal beneath which a material won't fail - approx. 50% of tensile strength of material!
SN curve magnitude of stress / number of cycles to failure
Impact test requirements notched bar (Izod, Charpy)
Impact test graph labels Brittle - brittle/ductile transition - ductile Temperature; energy
Tensile strength (formula) Max. force/ Original area
Second stage (creep test) Majority of deformation; linear; "creep rate"
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