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Engineering
Materials and Chemical Engineering
What is stiffness in a material
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[QUOTE="PhanthomJay, post: 5451250, member: 58874"] The modulus of elasticity (E) is not known as stiffness. Stiffness for an axially loaded compression or tension member, as you noted (which you defined as s, but which is typically noted as k as in Hooke's law F=kx), is AE/L. Beam bending stiffness is a function of E,I,L and boundary conditions . E by itself is a property of the material only, which is a measure of how much the material will strain under stress. For example, steel has a modulus E which is 3 times greater than aluminum. But a short piece of aluminum might have a greater stiffness than a long piece of steel. [/QUOTE]
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Forums
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Materials and Chemical Engineering
What is stiffness in a material
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