HiI've started a mechanics module and just wanted to know, what is

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Young's Modulus (E) represents the relationship between stress and strain in materials, specifically tensile stress over tensile strain. It is a material property that indicates stiffness, while the stiffness of a structure can also be defined using K = F/x. The discussion clarifies that E is not solely about structural stiffness but pertains to the material's inherent properties. Additionally, other moduli such as shear modulus and bulk modulus address different types of stress and strain. Understanding these distinctions is crucial for analyzing material behavior in mechanics.
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Hi

I've started a mechanics module and just wanted to know, what is the difference between Young's Modulus ('e') and the E = Stress/Strain?

Thanks!

Jase
 
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None :)
 


I had a feeling that was going to be the answer.

One last question about 'E': is this the stiffness of the structure or is this a property of the material stiffness only?

Thanks!
 


Depending on the type of structure, you would define stiffness with K = F/x, or an "effective" or "apparent" modulus.

In the case of the modulus, a "black box" would enclose your structure and you would determine the properties of that "box," e.g., the cross-sectional area of the box when calculating force/area = pressure.
 


Thanks for your help. I've got it now.
 


Strictly speaking E is tensile stress/ tensile strain.There is a shear modulus(shear stress/shear strain) and a bulk modulus(bulk stress/bulk strain).
 
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