For linear elastic systems, the type of displacement function

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For linear elastic systems, the type of displacement function for the strain energy is

1. linear
2. quadratic
3. cubic
4. quartic

Correct Option: B

Strain energy,

E =	1		PL²	=	1	Eε²
	2		AE		2

(Linear elastic system)
&here4; 2 Eαε² (quadratic)