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Introduction
7 Lessons-
StartIntroduction
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StartWhat is Mechanical Failure ? What are theories of failure?
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PreviewFailure criteria and importance of Principal stresses
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StartDefinition of Prinicipal stresses
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StartMohrs circle and formulae for principal stresses
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Start3D General State of Stress
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StartPrincipal stresses in 3D general state of stress
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Maximum Distortion Energy theory
8 Lessons-
StartStrain energy
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StartStrain energy density
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StartStrain energy density in Shear
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StartStrain energy in general state of stress
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StartMaximum Distortion Energy theory
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StartFinding the Distortion Energy component
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StartCriteria for Max Distortion Energy theory
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StartDefinition of Von Mises Stress and comparison with Maximum shear stress Theory
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Mohrs Criteria for Failure
7 Lessons-
StartMohrs criterion for ductile materials
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PreviewMohrs criteria- envelope derivation
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StartMohr coulumb theory of failure
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StartCases in Mohr coulumb theory of failure
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StartBrittle Coulumb mohr theory
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StartMaximum principal stress theory for brittle materials and its drawback
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StartSelecting Failure theory in design practice
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Fatigue
8 Lessons-
StartLimitations of traditional mechanics methods in design
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StartWhat is Fatigue failure?
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StartTypes of loadings - static and dynamic
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StartStages leading to fatigue failure
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StartModes of Fracture
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StartGeneric Factors which affect fatigue
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StartImportant checkpoints in fracture mechanics study
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StartFracture toughness material property
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Design for Fatigue
13 Lessons-
StartApproach to fatigue problems
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StartFatigue Life method, RR moore test , S-N diagram
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StartPlotting and Deciphering the S-N curve
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StartTypical values of Endurance and Fatigue strength
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StartModifying factors for Endurance limit/strength
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StartSurface modification factor
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StartSize modification factor
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StartLoading factor
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StartTemperature factor
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StartReliability factor
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StartStress concentration Factor - for Statics study
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StartFatigue stress concentration factor
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StartSome points on Designing with Fatigue
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Machine Design : Theories of failure and Design for fatigue
Learn about the Theories of mechanical failure and principles of designing for fatigue for mechanical engineerin
Course Summary
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.
Topics covered:
- Basics of Principal stress from mechanics of materials
- Importance of principal stress
- What are Theories of failure? the most simplest form
- Maximum 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 and how its used.
- Mohr theory - Theory for materials with different tensile and compressive strengths , Coulomb- Mohr theory
- Selection of Failure theory
- What is Fatigue loading? fatigue failure?
- Fracture mechanics basics
- What is fracture toughness property
- Factors to be considered
- The S-N curve and RR Moore test to develop S-N curve
- Endurance strength and Endurance limit
- The Endurance limit modifying factors
- Characterization of cyclical loading
- Definition of failure criteria in Fatigue
The 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 .
Pre-requisites:
- Understanding of Basics of Strength of materials
- Basics of mechanics
Course Curriculum
Mufaddal Rasheed
Mufaddal Rasheed is a mechanical design engineer , inventor and online entrepreneur working towards building a comprehensive knowledge resource base for students and mechanical design professionals with focus on building skills and knowledge to design mechanical products
The goal is to build a comprehensive knowledge eco-system for mechanical design engineers and aspirants which would prepare an individual for engineering innovation and advance their careers in terms of knowledge.
Experienced professional with 7+ years experience in Automotive product development designing chassis and suspension systems and being part of multiple projects from concept to production.
He is passionate about mechanical design and innovation and writes regularly on Quora with a Top writer badge.
Core belief is that engineering is a lifelong learning process and for a designer it is "the more you know the better you design"
Working towards developing an alternate solution to the problems of engineering education and upskilling for economic growth.