Machine Design Theories Of Failure And Design For Fatigue

Learn about the Theories of mechanical failure and principles of designing for fatigue for mechanical engineering
What you'll learn
Principal stress and their importance
Maximum Shear stress theory of failure
Maximum distortion Energy theory
Mohr and Columb mohr theory
Designing for Fatigue and Basics of fracture mechanics
Definition of endurance limit and strength
Modifying factors for Endurance strength
Defining failure criteria in fatigue
Requirements
Understanding of strength of materials or mechanics of materials is desirable to understand the concepts in the course
Description
Machine design is the practice of designing structural elements of a product to meet functional and durability criteria .Failure prevention is a big part of study for Machine design . This course deals with the various theories of failure in Static and dynamic (cyclic) loading conditions.Basics of Principal stress from mechanics of materials Importance of principal stressWhat are Theories of failure? the most simplest formMaximum Shear stress Theory - How it is derived , the analysis and cases Maximum distortion Energy theory - the most widely used theory of failure for ductile materials The derivation from concept of strain energyDefinition of Von mises stressMohr theory - Theory for materials with different tensile and compressive strengthsCoulomb- Mohr theoryBrittle Failure theorySelection of Failure theory What is Fatigue loading? fatigue failure?Fracture mechanics basicsWhat is fracture toughness property Factors to be consideredThe S-N curve and RR Moore test to develop S-N curveEndurance strength and Endurance limitThe Endurance limit modifying factorsSurface, Size, temperature, loading Stress concentration factor Characterization of cyclical loadingDefinition of failure criteria in FatigueThe course is designed to be compact and to the point highlighting the most important concepts and the Why ? behind it. This is an advanced level course suitable if you are already familiar with strength of materials or mechanics of materials and basics of mechanical engineering .
Overview
Section 1: Introduction
Lecture 1 Introduction
Lecture 2 What is Mechanical Failure ? What are theories of failure?
Lecture 3 Failure criteria and importance of Principal stresses
Lecture 4 Definition of Principal stresses
Lecture 5 Mohrs circle and formulae for principal stresses
Lecture 6 3D General State of Stress
Lecture 7 Principal stresses in 3D general state of stress
Section 2: Maximum Shear Stress theory
Lecture 8 Maximum Shear stress theory- introduction
Lecture 9 Criteria for Failure according to MSS
Lecture 10 Cases in Max shear stress theory
Section 3: Maximum Distortion Energy theory
Lecture 11 Strain energy
Lecture 12 Strain energy density
Lecture 13 Strain energy density in Shear
Lecture 14 Strain energy in general state of stress
Lecture 15 Maximum Distortion Energy theory
Lecture 16 Finding the Distortion Energy component
Lecture 17 Criteria for Max Distortion Energy theory
Lecture 18 Definition of Von Mises Stress and comparison with Maximum shear stress Theory
Section 4: Mohrs Criteria for Failure
Lecture 19 Mohrs criterion for ductile materials
Lecture 20 Mohrs criteria- envelope derivation
Lecture 21 Mohr coulumb theory of failure
Lecture 22 Cases in Mohr coulumb theory of failure
Lecture 23 Brittle Coulumb mohr theory
Lecture 24 Maximum principal stress theory for brittle materials and its drawback
Lecture 25 Selecting Failure theory in design practice
Section 5: Fatigue
Lecture 26 Limitations of traditional mechanics methods in design
Lecture 27 What is Fatigue failure?
Lecture 28 Types of loadings - static and dynamic
Lecture 29 Stages leading to fatigue failure
Lecture 30 Modes of Fracture
Lecture 31 Generic Factors which affect fatigue
Lecture 32 Important checkpoints in fracture mechanics study
Lecture 33 Fracture toughness material property
Section 6: Design for Fatigue
Lecture 34 Approach to fatigue problems
Lecture 35 Fatigue Life method, RR moore test , S-N diagram
Lecture 36 Plotting and Deciphering the S-N curve
Lecture 37 Typical values of Endurance and Fatigue strength
Lecture 38 Modifying factors for Endurance limit/strength
Lecture 39 Surface modification factor
Lecture 40 Size modification factor
Lecture 41 Loading factor
Lecture 42 Temperature factor
Lecture 43 Reliability factor
Lecture 44 Stress concentration Factor - for Statics study
Lecture 45 Fatigue stress concentration factor
Lecture 46 Some points on Designing with Fatigue
Section 7: Fatigue failure criteria
Lecture 47 Fluctuating stress types, mean and amplitude stress
Lecture 48 Goodman diagram and other criteria with factor of safety
Section 8: Bonus Section
Lecture 49 Bonus : More resources for learning Mechanical engineering and design
Mechanical Engineering students,Design engineers looking to refresh their basics in Machine design,Anyone interested in mechanical and machine design



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