Chapter 6, Problem 6.49P

Interpretation Introduction

(a)

Interpretation:

The distance between the supports needs to be determined,if the flexural strength is 85 MPa. This is to be stated whether polymer will fracture or not.

Concept introduction:

In a four-point bending method, force is applied by using two points. Flexural modulus can be calculated by using the following formula:

  $E=\frac{L^{3}F}{4b{h}^{3}y}$

Here,

L=length

F=Flexural force

b=width

h=thickness

y=distance covered by load/deflection

Interpretation Introduction

(b)

Interpretation:

The deflection at which bar breaks needs to be determined.

Concept introduction:

In a four-point bending method, force is applied by using two points. Flexural modulus can be calculated by using the following formula:

  $E=\frac{L^{3}F}{4b{h}^{3}y}$

Here,

L=length

F=Flexural force

b=width

h=thickness

y=distance covered by load/deflection