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The stress- strain relation is given as ___________

a) σ=D
b) σ=Dε
c) σ=ε
d) ε=Dσ

Answer: b
Explanation: The Hook’s law, states that within the elastic limits the stress is proportional to the strain since for most materials it is impossible to describe the entire stress – strain curve with simple mathematical expression, in any given problem the behavior of the materials is represented by an idealized stress – strain curve, which emphasizes those aspects of the behaviors which are most important is that particular problem.

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