The graph of true stress v/s true strain is given. In which total imposed strain of ξ = 0.1 , 0.2 , 0.3 a n d 0.4 . The elastic and plastic component of strain needs to be determined. Modulus of elasticity of metal is 100 GPa. Concept introduction: If the value of true stress depends on the actual cross-sectional area of specimen then, stress-strain curve increases with fracture. But if strain measurement is based on instantaneous, the curve obtained is called true-stress true strain curve.

Question

In baseball, batters frequently attempt to hit a ball as far as possible. However, baseballs are inelastic with an officially required "coefficient of restitution" CR ≈ 0.55 on ash wood. The coefficient of restitution of a dropped ball iswhere H is the initial drop height, h is the max. height on the rebound, and h ≈ 2πH tan δ for a homogeneous material. Assuming that a baseball is homogeneous and has a storage modulus approximately the same as that of cork (E' = 18.6 MPa), what must the value of the loss modulus E'' be so that the ball is regulation?

Answer 1

Question

Chapter 8, Problem 8.7P

Interpretation Introduction

Interpretation:

The graph of true stress v/s true strain is given. In which total imposed strain of ξ=0.1,0.2,0.3 and 0.4.

The elastic and plastic component of strain needs to be determined. Modulus of elasticity of metal is 100 GPa.

Concept introduction:

If the value of true stress depends on the actual cross-sectional area of specimen then, stress-strain curve increases with fracture. But if strain measurement is based on instantaneous, the curve obtained is called true-stress true strain curve.

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