Analysis Design Productivity Limited

Basic Fatigue Theory.

Course    C_F1

No. of days    2

Overview

This course is designed to give a thorough background of Stress-life and Strain-life fatigue theory to engineers. The course contains an overview of the theories used in fatigue modelling. The course is theoretical and it is used by many as a grounding in fatigue technology before embarking on the finite element based fatigue course.
The course will cover the following topics:
• Introduction to Fatigue and Durability
• The S­N approach
• The factors affecting Fatigue
• The Local Strain (E­N) approach
• Hand Calculations

Benefits

This course provides an in depth view of the theory and background to fatigue and durability management. The historical background and philosophy of the subject leads to an appreciation of how the established technology can be exploited to provide durable products faster, cheaper and better.

Who Should Attend

All engineers wishing to gain an appreciation of fatigue theory in terms of stress life (S­ N) and strain life (E­N) analysis. The philosophies of integrated durability management as applied to the design and operation of engineering products will also create an awareness of benefit to attendees.

Recommended background knowledge

• Engineering degree or engineering experience
• Calculation exercises will require the use of scientific calculators (bring your own!)

Programme

Fatigue theory part I
• Why do we need fatigue analysis
• How is durability dealt with in design
• The physics of fatigue
• The statistical nature of fatigue
Fatigue theory part II: SN analysis
• The SN curve
• Simple rainflow cycle counting
• Tutorial I: Simple SN Hand Calculation
Fatigue theory part III: EN analysis
• The EN curve
• Elastic­plastic rainflow cycle counting
• Tutorial II: Simple EN Hand Calculation
• Tutorial III: 2nd Order Rainflow Example
Fatigue theory part IV: Other factors affecting fatigue
• Dealing with stress concentrations and notches
• The effect of surface treatment and finish
• Other factors affecting fatigue

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