Stress - Answer--A force distributed over an area or object
-Stress = F/Ao
-Units: (lb/in2) or (psi or ksi) or (N/m2)
Strain - Answer--Percentage size change of a material in a particular direction when
subjected to a force in that direction
-Strain (Es) = Lf - Lo / Lo
-Units: none or (in/in) or (m/m)
Ultimate tensile strength - Answer-The maximum stress that can be applied to a
material before it breaks
Elastic limit/Yield Point - Answer-point where a material goes from elastic to plastic; last
point on linear part of graph
Break point - Answer-End of plastic behavior; where a material breaks
What is 0.2% offset yield (Engineering yield strength) - Answer-the stress at which a
material exhibits a specified deviation from proportionality of stress/strain. Also, it hard
to determine precisely so yield point is considered at an offset strain of 0.2%
How to find 0.2% offset yield - Answer-determining .002 strain and traveling parallel to
modulus of elasticity
Modulus of Elasticity
(What is it?, formula, where on stress/strain curve, tell about the material?) - Answer--A
measure of rigidity ( or stiffness)
- Slope of linear line
- delta stress/ delta strain (Es)
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