What is the difference between Young's Modulus and stiffness?

Question

What is the difference between Young's Modulus and stiffness?

Answer 1

Stiffness is the property of a material by virtue of which it retards deformation that is try to maintain the interatomic/ionic distance fixed.



Young's modulus comes when tensile/compression testing is done, it is the elastic limit. tensile/compression is applying longitudinal force, in turn, stress on a material. But force or stress can be and practically in all real situation is triaxial in nature.



So there are other measures of stiffness also, shear and bulk.

Young's modulus is one kind of measure of stiffness.

Answer 2

Modulus Of Stiffness

Answer 3

Young's Modulus E = stress/strain

and is measured in Nm^-1 ie pascals P.



stress = force/cross sectional area

strain = extension/original length



This is mainly used for calculating how material is deformed when tensile or compressive force is applied.



Stiffness is a term used to describe a material that has a high resistance to bending and stretching.



So, a material with a high Young's Modulus is a stiff material.

The difference is that one is a unique numerical value given to a material, and the other is a descriptive term based on this value.

Answer 4

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What is the difference between Young's Modulus and stiffness?

Answer 5

During tensile testing of a material sample, the stress–strain curve is a graphical representation of the relationship between stress, derived from measuring the load applied on the sample, and strain, derived from measuring the deformation of the sample, i.e. elongation, compression, or distortion. The slope of stress-strain curve at any point is called the tangent modulus; the slope of the elastic (linear) portion of the curve is a property used to characterize materials and is known as the Young's modulus. The area under the elastic portion of the curve is known as the modulus of resilience. Suppose that a metal specimen be placed in tension-compression-testing machine. As the axial load is gradually increased in increments, the total elongation over the gauge length is measured at each increment of the load and this is continued until failure of the specimen takes place. Knowing the original cross-sectional area and length of the specimen,The graph of these quantities is called the stress-strain diagram. The stress-strain diagram differs in form for various materials. Metallic engineering materials are classified as either ductile or brittle materials. A ductile material is one having relatively large tensile strains up to the point of rupture like structural steel and aluminum, whereas brittle materials has a relatively small strain up to the point of rupture like cast iron and concrete. An arbitrary strain of 0.05 mm/mm is frequently taken as the dividing line between these two classes. Rapture strength is the strength of the material at rupture. This is also known as the breaking strength.

Answer 6

there isn't one



On a stress/strain graph it is the gradient that tells us how stiff something is



stress/strain is Young's modulus the two things are the same.