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Machine Design : Theories of failure and Design for fatigue
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Introduction
What is Mechanical Failure ? What are theories of failure?
Failure criteria and importance of Principal stresses
Definition of Prinicipal stresses
Mohrs circle and formulae for principal stresses
3D General State of Stress
Principal stresses in 3D general state of stress
Maximum Shear stress theory- introduction
Criteria for Failure according to MSS
Cases in Max shear stress theory
Strain energy
Strain energy density
Strain energy density in Shear
Strain energy in general state of stress
Maximum Distortion Energy theory
Finding the Distortion Energy component
Criteria for Max Distortion Energy theory
Definition of Von Mises Stress and comparison with Maximum shear stress Theory
Mohrs criterion for ductile materials
Mohrs criteria- envelope derivation
Mohr coulumb theory of failure
Cases in Mohr coulumb theory of failure
Brittle Coulumb mohr theory
Maximum principal stress theory for brittle materials and its drawback
Selecting Failure theory in design practice
Limitations of traditional mechanics methods in design
What is Fatigue failure?
Types of loadings - static and dynamic
Stages leading to fatigue failure
Modes of Fracture
Generic Factors which affect fatigue
Important checkpoints in fracture mechanics study
Fracture toughness material property
Approach to fatigue problems
Fatigue Life method, RR moore test , S-N diagram
Plotting and Deciphering the S-N curve
Typical values of Endurance and Fatigue strength
Modifying factors for Endurance limit/strength
Surface modification factor
Size modification factor
Loading factor
Temperature factor
Reliability factor
Stress concentration Factor - for Statics study
Fatigue stress concentration factor
Some points on Designing with Fatigue
Fluctuating stress types, mean and amplitude stress
Goodman diagram and other criteria with factor of safety
Introduction
Introduction
What is Mechanical Failure ? What are theories of failure?
Failure criteria and importance of Principal stresses
Preview
Definition of Prinicipal stresses
Mohrs circle and formulae for principal stresses
3D General State of Stress
Principal stresses in 3D general state of stress
Maximum Shear Stress theory
Maximum Shear stress theory- introduction
Criteria for Failure according to MSS
Cases in Max shear stress theory
Maximum Distortion Energy theory
Strain energy
Strain energy density
Strain energy density in Shear
Strain energy in general state of stress
Maximum Distortion Energy theory
Finding the Distortion Energy component
Criteria for Max Distortion Energy theory
Definition of Von Mises Stress and comparison with Maximum shear stress Theory
Mohrs Criteria for Failure
Mohrs criterion for ductile materials
Mohrs criteria- envelope derivation
Preview
Mohr coulumb theory of failure
Cases in Mohr coulumb theory of failure
Brittle Coulumb mohr theory
Maximum principal stress theory for brittle materials and its drawback
Selecting Failure theory in design practice
Fatigue
Limitations of traditional mechanics methods in design
What is Fatigue failure?
Types of loadings - static and dynamic
Stages leading to fatigue failure
Modes of Fracture
Generic Factors which affect fatigue
Important checkpoints in fracture mechanics study
Fracture toughness material property
Design for Fatigue
Approach to fatigue problems
Fatigue Life method, RR moore test , S-N diagram
Plotting and Deciphering the S-N curve
Typical values of Endurance and Fatigue strength
Modifying factors for Endurance limit/strength
Surface modification factor
Size modification factor
Loading factor
Temperature factor
Reliability factor
Stress concentration Factor - for Statics study
Fatigue stress concentration factor
Some points on Designing with Fatigue
Fatigue failure criteria
Fluctuating stress types, mean and amplitude stress
Goodman diagram and other criteria with factor of safety
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