The Society of Naval Architects of Japan
60TH ANNIVERSARY SERIES
VOLUME 13
STUDIES ON THE BRITTLE FRACTURE
PROBLEMS IN JAPAN
By
Masao
Y O S H I K ITakeshi
K A N A Z A W AThe Society of Naval Architects of Japan
Tokyo, 1967
C O N T E N T S
PREFACE
Page
CHAPTER 1. Introduction 1
CHAPTER 2. Characteristics of Various Brittle Fracture Tests 4
2.1 ^Smah Size Test 4 2.2 Large Size Test 1 9 2.3 Correlation between Various Tests 27
CHAPTER 3. Theoretical Studies on the Mechanism of Brittle Fracture 3 1
3.1 Macroscopic Studies on Stress Criterion for the Mechanism of Fracture 32 3.2 Theoretical Studies on Energy Criterion for Initiation of Brittle Fracture . . . . 44
3.3 Theoretical Studies on Propagation of Brittle Fracture V 56
3.4 Effect of Non-uniform Stress Field and Specimen Size 73
3.5 Phenomenon of Brittle Crack Arrest 79
3.6 Other Theoretical Studies 89
CHAPTER 4. Studies on Mechanical Factors Influencing Brittle Fracture 95
4.1 Notch Geometries 95 4.2 Scale Effects 105 4.3 Effect of Residual Stress due to Welding for Brittle Fracture Initiation I l l
4.4 Effect of Residual Stress due to Welding on Path of Brittle Fracture
Propa-gation 128 4.5 Effect of Stress Concentration Caused by Structural Discontinuity on Brittle
Fracture Initiation 131
CHAPTER 5. Steel Quality and Notch Toughness 137
5.1 Developments in Ship Hull Steel 137
5.2 Thick Plates 141 5.3 Heat Treated Steels 145
5.4 Stainless Steel Clad Plates 147 5.5 Brittle Fracture Initiation and Propagation-Arrest Characteristics 148
5.6 Notch Toughness of Welded Joints 150 5.7 Effect of Fabricating Process other than Welding 169
CHAPTER 6. Conclusions 172
6.1 Counter-measures against Brittle Fracture of Steel Structures 172
