Online Fatigue and Fracture Training

ABOUT THE COURSE

Following a general introduction to fatigue and fracture, with examples of service failures, current and developing fatigue design and assessment methods will be described. The course will go on to explain the importance of crack/flaw analysis in structural design and safety assessment and illuminate its wide range of applicability. It will give a deep understanding of the major results and criteria underpinning modern fracture mechanics, the assumptions behind them and important limitations. Attendees will gain a better understanding of material selection for fatigue and fracture resistance and learn about codified procedures for flaw evaluation.
The course will introduce fundamental concepts of Engineering critical assessment / Fitness for service assessments; from stress intensity factor, CTOD and J-integral to methods of measuring and calculating fracture toughness for use in the ECA assessment. The fracture and fatigue crack growth assessment methodology of BS 7910 shall be presented and illustrated with examples

WHO SHOULD ATTEND

Engineers and scientists involved in the design, operation and assessment of both onshore and offshore structures.

PROGRAMME

Day 1

09.00 – 10.30 Lecture 1: Introduction
• Fatigue mechanism of materials
• Fatigue mechanism of welded structures
• Fatigue design principles and Fatigue damage models
• Uncertainties in fatigue damage prediction
• Major factors affecting fatigue life

10.30 – 11.00 Break

11.00 – 12.30 Lecture 2: S – N Curve and Effect of Stress Concentration specific to floating structures
• Origin of SN curve & Fatigue test
• Segments of SN curve
• SN curve for welded structural details
• Lessons learned from the past
• Definition of stress concentration factor (SCF)
• Methods for assessing SCF
• Stress concentration in hull structural details
• Stress concentration at welds
• Finite element modelling for SCF

12.30 – 13.30 Break

13.30 – 15:00 Lecture 3: Fatigue Damage under Random Loads
• Linear damage accumulation law
• Fatigue damage model under random loads
• Effect of bandwidth
• Equivalent stress range

15.00 – 15.30 Break

15.30 – 17.00 Lecture 4: Effects of Corrosion, Mean Stress, Thickness and Material Strength
• Mechanism of corrosion
• Impact of corrosion on fatigue resistance
• Principal aspect of coupled corrosion fatigue
• Recommendations for fatigue design
• Corrosion rate for some structural elements
• Simple Mean Stress Models & Strain-Life Based Models
• Mean Stress Effects in Welded Structures
• Effect of Plate Thickness on Fatigue Resistance
• Effect of Material Strength on Fatigue Resistance

Day 2

09.00 – 10.30 Lecture 5. Rules for Fatigue Design of Welded Structures and Weld Improvement Techniques
• Fatigue assessment process for hull and offshore structures
• Assessment of local stress in structural details for fatigue analysis
• Evaluation of hot-spot stress
• Secondary stress
• Welding Improvement Techniques
• Loading and Environmental Conditions
• Limitations

10.30 – 11.00 Break

11.00 – 12:30 Lecture 6. Spectral Fatigue Assessment
• Main Assumptions and Process
• Wave Spectra and Spreading Function
• Wave Scatter Diagram
• Motion Analysis and Wave-induced Loads
• Structural Modeling and Analysis
• Hot-Spot Stress Approach and S-N Data
• Closed Form Damage Calculation

12.30 – 13.30 Lunch

13.30 – 14:15 Lecture 7. Strain-Life Criterion-based Approach
• Local Strain Methodology
• Strain Life Cyclic Curves
• Strain-Life Criterion for Fatigue
• Evaluation of Local Strain
• Applications

14.15 – 15:00 Lecture 8. Fracture Mechanics: Basic concepts
• Fracture Mechanics: Basic concepts
• Fatigue crack propagation
• Stress intensity factor
• Evaluation of stress intensities

15.00 – 15.30 Break

15.30 – 17.00 Lecture 9. Application of Fracture Mechanics and BS7910
• Evaluation of (residual) fatigue life
• Fatigue Crack Propagation: Consequences
• BS7910: Main Content

ABOUT THE LECTURER:

Dr Helena Polezhaeva
Dr Helena has more than 30 years’ experience, and is internationally recognised as a fatigue expert, specialising in the development of spectral fatigue analysis and fatigue assessment procedures for a wide variety of ship types and offshore structures.
Helena also has expertise in fatigue related consultancy and research including fatigue testing and numerical analysis as well as the development and delivery of fatigue training. Helena was awarded a Royal Society Fellowship in 1994 for her Post-Doctoral research

PAST PARTICIPANTS
• Atkins, UK
• Apollo, UK
• BAE Systems, UK
• Bayards, Netherlands
• Cadent, UK
• Combifloat Systems BV, Netherlands
• Conoco Phillips Oil and Gas, UK
• Crondall Energy, UK
• EDF Energy, UK
• Lloyds Register, UK
• LOC, UK
• Malin Group, UK
• Navantia, Spain
• Petrofac, UK
• Royal Roos, Netherlands
• Schlumberger, Netherlands
• Shell, UK
• TUV Reinland, Germany
• Ventient Energy, UK

Duration: 2 Days

Cost: £595