Chapter 7, Problem 7.36P

Interpretation Introduction

(a)

Interpretation:

In the given figure, the high strength steel is given having critical fracture toughness of $80MPa\sqrt{m}$ which is put under varying alternating stress limit from -900 to +900MPa.Before failure, it has tosurvive 105 cycles. Assuming f=1, thesize of the surface crack required for failure needs to be determined.

Concept Introduction:

Surface crack testing is a non-destructive method used for detecting the surface material defect.

Interpretation Introduction

(b)

Interpretation:

In the given figure, the high strength steel is given having critical fracture toughness of $80MPa\sqrt{m}$ which is put under varying alternating stress limit from -900 to +900MPa.Before failure, it has to survive 105 cycles. Assuming f=1, the largest initial surface crack size that will make failure needs to be determined.

Concept Introduction:

Surface crack testing is a non-destructive method used for detecting the surface material defect.