Just curious why Div. 2 is based on stress intensity (as opposed to Von Mises stress). I believe the max shear stress theory (basis for SI) is more conservative than the distortion energy theory (basis for VM). Is it just "history" that SI was chosen, or is there a technical reason. Thanks in advance.
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Div.2 - Stress Intensity vs. Von Mises
- Thread starter rmartin00
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rmartin00 (Mechanical)
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PVRC Conference
Conference on New Tools for Dealing with Fatigue of Structures
October 10 - 13, 2006
Houston, Texas
Join PVRC with a group of internationally known fatigue specialists at the Houston Sofitel on October 10-12, 2006 to learn about ‘state-of-the-art’ tools, standards and technology to manage fatigue, INCLUDING a tutorial on the new Master S-N Curve Approach to fatigue design and assessment. You will obtain practical information that will help you save money and prevent failures.
Metal fatigue and the fatigue of welded components in particular rank high among the reasons for failure and are primary safety concerns. Affected industries include transportation, bridge, heavy machinery, ships and offshore structures as well as nuclear and fossil power, petroleum and process industries. Over the last decade, vastly improved tools have become available for design, life prediction and performance enhancement. This Conference will present these tools in clear and concise terms so attendees may properly apply them and deal with rapidly evolving and complex codes and standards. Engineers involved in the above industries should attend.
The Pressure Vessel Research Council (PVRC), a key source of new design and fabrication technology for over fifty years, is offering a unique 2-1/2 day conference to present new and practical information on fatigue of structures and welded components. Leaders in the field will provide you with problem-avoiding solutions for design, life assessment and other practical matters that will help you improve equipment reliability.
The Pressure Vessel Research Council (PVRC), a key source of new design and fabrication technology for over fifty years, is offering a unique 2-1/2 day conference to present new and practical information on fatigue of structures and welded components. Leaders in the field will provide you with problem-avoiding solutions for design, life assessment and other practical matters that will help you improve equipment reliability.
The Master S-N Curve Approach was developed and will be explained by Pingsha Dong of Battelle Memorial Institute. The Master S-N Curve is based on a structural stress parameter rather than a hot spot or nominal stress, providing far superior correlation with performance of weldments. The resulting fatigue analysis procedures can be used for life estimation for structures containing welded joints under a wide range of loading conditions. The method is general and can be used with other cumulative damage theories. Statistical analysis can be used to establish the design fatigue curve and structural reliability methods, i.e. probabilistic analysis can also be used in the design process.
Additional topics to be covered include:
• Proper estimation of the fatigue driving forces
• Examples of application across industries
• Cycle counting
• Multiaxial effects and stress concentrations
• Failure probabilities
• Mean and residual stresses.
Internationally recognized experts will report on experiences, and provide common sense solutions to frequently encountered problems. This is your opportunity to obtain information and ask questions about factors that aggravate fatigue tendencies and to sort out confusion about safety margins, failure probabilities, Fitness-For-Service, damage summation models and fatigue improvement, repair and remediation methods.
This may lead to a nother question:
PVRC Conference
Conference on New Tools for Dealing with Fatigue of Structures
October 10 - 13, 2006
Houston, Texas
Join PVRC with a group of internationally known fatigue specialists at the Houston Sofitel on October 10-12, 2006 to learn about ‘state-of-the-art’ tools, standards and technology to manage fatigue, INCLUDING a tutorial on the new Master S-N Curve Approach to fatigue design and assessment. You will obtain practical information that will help you save money and prevent failures.
Metal fatigue and the fatigue of welded components in particular rank high among the reasons for failure and are primary safety concerns. Affected industries include transportation, bridge, heavy machinery, ships and offshore structures as well as nuclear and fossil power, petroleum and process industries. Over the last decade, vastly improved tools have become available for design, life prediction and performance enhancement. This Conference will present these tools in clear and concise terms so attendees may properly apply them and deal with rapidly evolving and complex codes and standards. Engineers involved in the above industries should attend.
The Pressure Vessel Research Council (PVRC), a key source of new design and fabrication technology for over fifty years, is offering a unique 2-1/2 day conference to present new and practical information on fatigue of structures and welded components. Leaders in the field will provide you with problem-avoiding solutions for design, life assessment and other practical matters that will help you improve equipment reliability.
The Pressure Vessel Research Council (PVRC), a key source of new design and fabrication technology for over fifty years, is offering a unique 2-1/2 day conference to present new and practical information on fatigue of structures and welded components. Leaders in the field will provide you with problem-avoiding solutions for design, life assessment and other practical matters that will help you improve equipment reliability.
The Master S-N Curve Approach was developed and will be explained by Pingsha Dong of Battelle Memorial Institute. The Master S-N Curve is based on a structural stress parameter rather than a hot spot or nominal stress, providing far superior correlation with performance of weldments. The resulting fatigue analysis procedures can be used for life estimation for structures containing welded joints under a wide range of loading conditions. The method is general and can be used with other cumulative damage theories. Statistical analysis can be used to establish the design fatigue curve and structural reliability methods, i.e. probabilistic analysis can also be used in the design process.
Additional topics to be covered include:
• Proper estimation of the fatigue driving forces
• Examples of application across industries
• Cycle counting
• Multiaxial effects and stress concentrations
• Failure probabilities
• Mean and residual stresses.
Internationally recognized experts will report on experiences, and provide common sense solutions to frequently encountered problems. This is your opportunity to obtain information and ask questions about factors that aggravate fatigue tendencies and to sort out confusion about safety margins, failure probabilities, Fitness-For-Service, damage summation models and fatigue improvement, repair and remediation methods.
Stress intensities were originally used when Div. 2 was first developed because the math was easier. However, the point that you make about the von Mises stress is correct, and I can confirm jte's rumour thta the new Div. 2 will use the equivalent stress method (von Mises).
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