8.1 ME 340: Materials & Design CHAPTER 8 (ch. 3 in ref.1) ENGINEERING MATERIALS AND THEIR...
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Transcript of 8.1 ME 340: Materials & Design CHAPTER 8 (ch. 3 in ref.1) ENGINEERING MATERIALS AND THEIR...
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8.1ME 340: Materials & Design
CHAPTER 8 (ch. 3 in ref.1)
ENGINEERING MATERIALS AND THEIR PROPERTIES
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8.2ME 340: Materials & Design
MATERIALS – are the food of design
This chapter presents the full shopping menu or list
Successful product=-good value for money.-Gives pleasure to user-Uses best material for job-Fully exploits their potential-brings out their flavor
Don’t forget though that it is not materials we are after it is certain profile of properties that can be provided by any given material
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8.3ME 340: Materials & Design
CLASSES OF ENGINEERING MATERIALS
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8.4ME 340: Materials & Design
Each material can be thought of as having a set of attributes; it’s properties
We consider property-profile
And the material name is the identifier for a particular property profile
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8.5ME 340: Materials & Design
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8.6ME 340: Materials & Design
The bulk modulus gives the change in volume of a solid substance as the pressure on it is changed,
For isotropic elastic solids
Data books list values for all 4 properties We will use eqn. 3.2 for E values
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8.7ME 340: Materials & Design
STRENGTH of a solid: f Requires careful definition
For METALS 0.2% offset yield strength
POLYMERS
Stress at which Stress-strain curves become
Markedly non-linear:typically at strain of 1%
ft2.1~f
c
tff
c to 1510CERAMICS
Crushing strength
Fracture strength
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8.8ME 340: Materials & Design
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8.9ME 340: Materials & Design
When difficult to grip specimen (e.g. ceramics)
Larger by ~1.3 than test in tension
WHY???
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8.10ME 340: Materials & Design
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8.11ME 340: Materials & Design
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8.12ME 340: Materials & Design
Hardness = load/projected area
INCORRECT, What is correct eqn.??
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8.13ME 340: Materials & Design
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8.14ME 340: Materials & Design
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8.15ME 340: Materials & Design
Cyclic loading fatigue limit or fatigue life.Fatigue ratio f dimensionless quantity (f /y)
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8.16ME 340: Materials & Design
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8.17ME 340: Materials & Design
Service temperature And softening temp
Kinetic factorUnits: s-1 Reference stress
Thermal shock in K
1/3Tm or 2/3 Tg
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8.18ME 340: Materials & Design
Kp=parabolic rate constant
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8.19ME 340: Materials & Design
WET CORROSION More complicated and is measured on a a scale , rather than a rate equation.