What is meant by each of the following terms?
a. Elastic limit
b. Yield point
c. Ultimate strength
d. Stiffness
a. Elastic limit A value of stress at which a material no longer stretches and becomes permanently deformed.
b. Yield point The stress at which the stress-strain relationship is no longer linear, or generally equal to a strain of 2%; above which plastic deformation no longer occurs.
c. Ultimate strength In either compression or tension, it is the maximum stress that a material can withstand without breaking.
d. Stiffness It is a measure of a structure’s resistance to deformation and is not a property of a material. I can be determined by dividing an applied force by the displacement of the structure as induced by that force.
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