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Engineering
Materials and Chemical Engineering
What is stiffness in a material
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[QUOTE="PhanthomJay, post: 5456868, member: 58874"] The confusion is in the term 'stiffness' and how it is defined. Based on properties of the material alone, steel is, 'materially' speaking , stiffer than aluminum, since it has a higher E modulus, and will [B]strain[/B] less than aluminum under a given [B]stress[/B]. But based on the properties of the structural member, including E, A, L, and I, then, 'structurally' speaking, a short/stubby piece of aluminum will be stiffer than a long/slender piece of steel, since it will [B]deform[/B] less under a given [B] load[/B]. This definition is consistent with Hooke's law definition of stiffness for axially loaded members. Actually, the conclusion reached by the OP is excellent. Regarding the question of the units for Elasticity,which is stress/strain, it must have the same units as stress since strain is a dimensionless quantity. I think of elasticity as the stress in a member that would exist at 100 percent strain, that is, the stress in the member that would exist when it was elongated by a force causing it to stretch twice it's original length ( assuming a perfectly elastic material of perhaps unimaginable strength). [/QUOTE]
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What is stiffness in a material
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