Elementary engineering fracture mechanicsWhen asked to start teaching a course on engineering fracture mechanics, I realized that a concise textbook, giving a general oversight of the field, did not exist. The explanation is undoubtedly that the subject is still in a stage of early development, and that the methodologies have still a very limited applicability. It is not possible to give rules for general application of fracture mechanics concepts. Yet our comprehension of cracking and fracture beha viour of materials and structures is steadily increasing. Further developments may be expected in the not too distant future, enabling useful prediction of fracture safety and fracture characteristics on the basis of advanced fracture mechanics procedures. The user of such advanced procedures m\lst have a general understanding of the elementary concepts, which are provided by this volume. Emphasis was placed on the practical application of fracture mechanics, but it was aimed to treat the subject in a way that may interest both metallurgists and engineers. For the latter, some general knowledge of fracture mechanisms and fracture criteria is indispensable for an apprecia tion of the limita tions of fracture mechanics. Therefore a general discussion is provided on fracture mechanisms, fracture criteria, and other metal lurgical aspects, without going into much detail. Numerous references are provided to enable a more detailed study of these subjects which are still in a stage of speculative treatment. |
Contents
Chapter 2 | 23 |
The elastic cracktip stress field | 67 |
Chapter 4 | 91 |
67 | 99 |
Dynamics and crack arrest | 142 |
Plane strain fracture toughness | 170 |
Chapter 8 | 185 |
Elasticplastic fracture | 219 |
Failsafety and damage tolerance | 317 |
Chapter 13 | 328 |
Chapter 5 | 331 |
Chapter 14 | 347 |
Fracture of structures | 377 |
Stiffened sheet structures | 408 |
Chapter 17 | 434 |
455 | |
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Common terms and phrases
Aerospace Inst aluminium alloy amplitude analysis application ASTM STP behaviour Broek calculated chapter cleavage constant crack arrest crack extension crack length crack resistance crack speed crack tip criterion critical crack CTOD curve cycle da/dN depends determined discussed ductile ductile fracture dynamic effect energy release rate equations fail-safe failure fatigue crack growth fatigue crack propagation finite element Fract fracture mechanics fracture toughness function hole increase initial K₁ K₁e kg/mm² kinetic energy Kmax ligament linear elastic load maraging steel measured Mech method mode non-linear notch occur overload parameter particles plane strain plane stress plastic deformation plastic zone correction plate predictions pressure vessels problem Rept residual strength retardation Schijve shear sheet shown in figure similitude small crack specimen steel stiffened panel stress field stress intensity factor stringer structure surface flaw tensile test data thickness yield strength yield stress zero Δα πα