what make some material has greater Young Modulus than other?please answer me a.s.a.p ok!!?

Answer 1

Hi pia

Young's modulus for a particular material is defined as stress/strain, meaning it's a measure of the stress required to deform a material. A higher value for Young's Modulus (E) means a greater stress (force/area) is required to produce a strain, in other words the object resists deformation. An object which resists deformation is said to be "stiff" or "tough". A substance with low E value is rubber (stretches easily), whereas diamond has a very high value for E.

To find out some properties which might influence E, let's first write it in terms of the Lame constants (elasticity constants) lambda λ and mu μ:

E = μ(3λ + 2μ) / (λ + μ)

You can find a host of relations linking λ and μ to other physical properties at http://scienceworld.wolfram.com/physics/LameConstants.html


Hope this helps!
The Chicken