UNIT 4
Conditions for Static Equilibrium
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6
Mechanical Properties of Solids
Example 1
Example 2
Example 3
Example 4
Example 5
Example 6

 

 

Mechanical Properties of Solids

Example 4

q2 Fig 43.1 shows the stress strain curves for four materials. (a) List the materials in order of increasing Young's modulus.
(b) List the materials in order of increasing strength.
(c) Which material is likely to be (i) rubber, (ii) mild steel, (iii) Stainless steel, (iv) glass?
Fig 4.1
 

(a) D, C, B, A. The Young's modulus is the gradient of a stress stain curve as Young's Modulus = [[Stress] / [Strain]].

(b) B, A , C, D. The stress required to fracture B is highest and while A is high, C is less and D will fracture with a small force.

(c) (i) D - rubber. It stretches quite a lot for small stresses.
(ii) C - mild steel. It has moderate strength and shows quite a bit of plastic deformation before it fractures.
(iii) B - Stainless steel. It has high strength and fractures quite suddenly without much plastic deformation.
(iv) A - glass. It has high strength and fractures quite suddenly without very little or no plastic deformation.

   
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Concept by Kishore Lal. Programmed by Kishore Lal... Copyright © 2015 Kishore Lal. All rights reserved.