Chapter 7, Problem 7.7P

Interpretation Introduction

Interpretation:

The size of the internal flaw required to originate the fracture in an aluminum alloy needs to be determined.

Concept introduction:

Plane-strain fracture toughness is used to calculate as the flaw size as follows:

$k_{IC}=f\sigma \sqrt{\pi a}$

Here,

$\begin{array}{l}F=\text{ geometry factor of flaw and specimen}\hfill \\ \sigma =\text{stress applied}\hfill \\ a=\text{ flaw size }\left(\text{have crack length}\right)\hfill \\ k_{IC}=\text{fracture toughness}.\hfill \end{array}$