06ME832-Fracture Mechanics |
PART – A |
UNIT I: |
FRACTURE MECHANICS PRINCIPLES: Introduction, Mechanisms of
Fracture, a crack in structure, the Griffith’s criterion, modern design –
strengths, stiffness and toughness. Stress intensity approach
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UNIT II: |
STRESS ANALYSIS FOR MEMBERS WITH CRACKS: Linear elastic
fracture mechanics, Crack tip stress and deformations, Relation between
stress intensity factor and fracture toughness, Stress intensity based solutions.
Crack tip plastic zone estimation, Plane stress and plane strain concepts. The
Dugdale approach, the thickness effect.
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UNIT III: |
ELASTIC – PLASTIC FRACTURE MECHANICS: Introduction, Elasto–
plastic factor criteria, crack resistance curve, J-integral, Crack opening
displacement, crack tip opening displacement. Importance of R-curve in
fracture mechanics, experimental determination of J-integral, COD and
CTOD.
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UNIT IV: |
DYNAMIC AND CRACK ARREST: Introduction, the dynamic stress
intensity and elastic energy release rate, crack branching, the principles of
crack arrest, the dynamic fracture toughness.
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PART – B |
UNIT V: |
FATIGUE AND FATIGUE CRACK GROWTH RATE: Fatigue loading,
various stages of crack propagation, the load spectrum, approximation of the
stress spectrum, the crack growth integration, fatigue crack growth laws.
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UNIT VI: |
FRACTURE RESISTANCE OF MATERIALS: Fracture criteria, fatigue
cracking criteria, effect of alloying and second phase particles, effect of
processing and anisotropy, effect of temperature, closure.
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UNIT VII: |
COMPUTATIONAL FRACTURE MECHANICS: Overview of
numerical methods, traditional methods in computational fracture mechanics – stress and displacement marching, elemental crack advance, virtual crack
extension, the energy domain integral, finite element implementation.
Limitations of numerical fracture analysis.
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UNIT VIII: |
FRACTURE TOUGHNESS TESTING OF METALS: Specimen size
requirements, various test procedures, effects of temperature, loading rate and
plate thickness on fracture toughness. Fracture testing in shear modes, fatiguetesting, NDT methods
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REFERENCE |
TEXT BOOKS: |
1. Introduction to Fracture Mechanics, Karen Hellan McGraw Hill
Pub.2000
2. Fracture of Engineering Brittle Materials, Jayatilake, Applied
Science, London. 2001.
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Reference Books |
1. Fracture Mechanics – Fundamentals and Application, T.L.
Anderson, CRC press 1998
2. Elementary Engineering Fracture Mechanics, David Broek,
Artinus Nijhoff, London 1999.
3. Fracture and Fatigue Control in Structures, Rolfe and Barsom,
Printice Hall 2000.
4. Fundamentals of Fracture Mechanics, Knott, Bureworth 2000.
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