Dislocation Theory
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Lecture Notes
Introduction to Deformation in Metals
Stress and Strain tensors and their applications
Introduction to Dislocations in Metals
Energy of dislocations, Peach-Koehler force and its applications
Stacking faults and Dislocation reactions in different crystal systems
Yield point phenomenon and Bauschinger effect
Tensile testing and factors affecting tensile properties
Dislocation sources and Dislocation interactions
Lecture Videos
Stress tensor and yield criterion
Strain tensor, Constitutive equations for relating stress and strain tensors
Introduction to edge and screw dislocations
Concept of dislocation motion: part I
Concept of dislocation motion: part II
Peierls-Nabarro stress and slip on close packed planes: part I
Peierls-Nabarro stress and slip on close packed planes: part II
Derivation of Hooke’s law from interatomic potential energy
Importance of stress-strain curve and derivation of theoretical shear strength
Deviation from theoretical shear strength and understanding the Schmid law
Deformation behavior in single crystal and poly crystal
Tensile testing and its sequential events
Dislocations in metals: Summarization
Stacking faults in FCC metals
Formation and movement of extended dislocations in FCC metals
Difference between tension and compression tests and their practical applications
Stress-strain field around a screw dislocation: Volterra model
Energy of a screw and edge dislocation
Peach-Koehler Force on a dislocation and its application
Forces between dislocations
Sources and multiplication of dislocations
Fracture Mechanics and Analysis of Engineering Failures
Lecture Notes
Introduction to Deformation in Metals
Stress and Strain tensors and their applications
Introduction to Fracture Mechanics
Stress Intensity Factor Derivation
Estimation of plastic zone size
Plane strain fracture toughness testing
Plane stress fracture toughness testing
J-integral testing
Concept of Crack Tip Opening Displacement (CTOD) and CTOD testing
Probabilistic and Statistical concept of Fracture
Ductile to Brittle transition in metals and alloys
Fatigue Cracking
Fatigue Crack Growth
Micro-mechanisms of Fracture
Fracture modes and Failure Analysis: Fractography
Environment Assisted Cracking
Time Dependent Deformation: Creep
Failure Analysis
Lecture Videos
Introduction to Deformation and Fracture in materials- Part I
Introduction to Deformation and Fracture in materials- Part II
Stress tensor and yield criteria
Yield criteria (contd.), Strain tensor and Constitutive equations relating stress tensors and strain tensors (Elastic constants)
Concept of stress concentration and Critical Stress for Fracture
Stress Triaxiality in Presence of a Notch
Stress Distribution Ahead of a Crack Tip
Derivation of Theoretical Cohesive Strength of a material
Relating Crack Size and Fracture Strength from the concept of Theoretical Cohesive Strength and Stress Concentration
Griffith Theory of Fracture
Strain Energy Release Rate (G) Vs. Crack Growth Resistance(R) concept - Part I
Strain Energy Release Rate (G) Vs. Crack Growth Resistance(R) concept - Part II
Energy Released Under Fixed Grip and Fixed Loading Conditions
Critical Value of Strain Energy Release Rate (G) Under Plane Strain and Plane Stress Condition
Significance of Critical Strain Energy Release Rate (GC) and Critical Stress Intensity Factor (KC)
Concept of Plane strain fracture toughness and Plane stress fracture toughness and their Importance
Pop-in Phenomenon During Crack Propagation, Crack Branching and Principles of Crack Arrest
Introduction to Stress Intensity Factor and Conditions Required for Crack Propagation
Derivation of Stress Field Ahead of Crack Tip and Concept of Stress Intensity Factor- Part I
Derivation of Stress Field Ahead of Crack Tip and Concept of Stress Intensity Factor- Part II
Derivation of Stress Field Ahead of Crack Tip and Concept of Stress Intensity Factor- Part III
Derivation of Stress Field Ahead of Crack Tip and Concept of Stress Intensity Factor- Part IV
Plastic Zone Size, Competition Between Yield Strength and Fracture Strength During Crack Propagation
Critical Stress for Fracture Under Plane Strain and Plane Stress Condition, Irwin Plastic Zone Correction
General Discussion on the Fundamental Aspects of Fracture Mechanics
Effective Crack Length, Superposition Principle and Dugdale Strip-Yield Model for Plastic Zone Size
Students' Presentation on Linear-Elastic Plane-Strain Fracture Toughness, KIC of Metallic Materials
Strip-Yield Model (contd.), Finite Specimen Size and Crack Tip Plasticity Corrections of Stress Intensity Factor
Plane Strain Fracture Toughness Testing
Effect of Different Parameters on KIC
Understanding the Concept of Critical Stress Intensity Factor
R-curve Analysis and Plane Stress Fracture Toughness Testing
Concept of J-integral Theory
Application of J-integral on LEFM and EPFM
J-controlled Fracture and Crack Growth Resistance Curve Determination
Relating Crack Tip Opening Displacement (CTOD) with J-integral
Fracture-Based Material Design Approaches
Students’ Presentation on ASTM E1820 Standard: K-R, J-R and CTOD-R Curve Determination
Charpy Impact Testing: Part-I
Charpy Impact Testing: Part-II
Micromechanics of Crack Initiation and Propagation
Factors affecting Ductile-to-Brittle Transition Temperature
Different Impact Transition Curves and Fractography
Fatigue Failure: Cracking Under Cyclic Loading
Factors Affecting Fatigue Crack Growth Rate (FCGR)
Cyclic Stress-Strain Curve and Cumulative Fatigue Damage
Environment Assisted Cracking
High Temperature Failure and Different Toughening Mechanisms
Students’ Presentation on Standard Test Methods for Fatigue Testing; Probabilistic and Statistical Concept of Fracture
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