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MAT E 202 – MIDTERM QUESTIONS & VERIFIED ANSWERS

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MAT E 202 – MIDTERM QUESTIONS & VERIFIED ANSWERS

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MAT E 202 – MIDTERM QUESTIONS & VERIFIED
ANSWERS


Ductility
%EL %RA - Answers - Measure of Plastic Strain to Fracture

Hardness
H=F/A
[Pa] - Answers - Resistance to localized Plastic deformation due to penetration by an
indenter

Toughness
Modulus = A under curve
[J/mm^2] - Answers - Amount of E absorbed to cause failure by fracture
Modulus: Ceramic>Metal>Polymer

Resilience
Modulus=Area under elastic region
[J/mm^2] - Answers - Capacity of material to absorb E wile elastic

Fatigue - Answers - Material Failure at significantly lower stress due to
dynamic/fluctuating stress

Creep - Answers - Material Failure due to static stress at high temperature

Heat Capacity
=dQ/dT
[J/mol*K] - Answers - Ability to absorb external heat

Thermal Expansion
[unitless] - Answers - degree of expansion of material by heating
lower bonding energy = lower thermal expansion

Thermal Conductivity
q = -k (dQ/dT)
[W/m*K] - Answers - ability to transfer heat

Thermal Stress
[MPa] - Answers - stresses induced in a body as a result of changes in temperature
Heating and Cooling Graphs

Thermal Shock Resistance
[W/m] - Answers - combo of thermal expansion and thermal conductivity

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