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Experimental Evaluation of the Markl Fatigue Methods and ASME Piping Stress Intensification Factors (July 2008)
This document includes the slides presented at the 2008 PVP Conference in Chicago, Illinois USA.
The presentation summarizes the methodology used in experimental fatigue tests that included girth butt welds and unreinforced
tees. Also, 600 butt weld data were gathered and compared to the Markl girth mean butt weld fatigue curve.
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Markl, SIFs, and ASME VIII-2 Fatigue Design (January 2008)
This brief article addresses the question of "What are SIFs, where did they
come from, and how do they relate to ASME Section VIII-2 fatigue designs?"
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Fatigue Testing of Welded Flat Head Pressure Vessel Joints (July 2007)
Presentation slides of continuing fatigue analysis research conducted at Paulin
Research Group. The work addresses effects of thickness on fatigue life and
addresses concerns of contained fluid on testing methodology.
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Regression Analysis of Markl Girth Butt Weld Data (May 2007)
This article reports the results of regression analysis of data reported by
A. R. C. Markl in 1952.
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Items for Discussion Related to the Div 2 Rewrite Master SN Method (February 2007)
Presentation slides of work presented to rewrite of ASME Section VIII, Division 2
fatigue rules. The work concentrates on application of previous work by Neuber
on correlation rules.
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Observations Related to the Master SN Method in the ASME Division 2 Rewrite Project (February 2007)
The report addresses specific issues related to the implementation of the Master SN method in the
ASME Division 2 Rewrite project. These issues illustrate situations where the implementation
can lead to non-conservative solutions. In addition, comparisons against other fatigue methods
including European as-welded codes is achieved by using fatigue charts based on specified load
instead of stress. These charts show that the proposed Div 2 Rewrite SSM method will produce
lower lives for high quality weld joints while allowing greater lives for low quality weld joints in
comparison to the existing ASME FSRF method. In addition, Neuber’s rule is discussed in terms
of Code stress limits and analysis methods to illustrate why it is not required in the Div 2 Rewrite
project.
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Review of the Master SN Neuber Rule in the ASME Division 2 Rewrite Project (February 2007)
The goal of this discussion is to illustrate that when fatigue design curves are developed using databases comprised
of welded or notched fatigue specimens (not smooth bars), there is no need to apply plasticity correction factors as
part of the design process. Such a conclusion is certainly warranted for the pseudo elastic stresses calculated from
displacement controlled conditions. ASME primary and secondary stress limits prevent load controlled conditions
(primary type loads) from achieving stress ranges where Neuber’s would be required (stress ranges greater than
2*Sy) and is therefore not a significant part of this discussion.
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Update on Fatigue Testing at Paulin Research Group (November 2006)
Presentation slides of continuing research effort at Paulin Research Group.
The work focuses effects of thickness on fatigue life in evaluation of the
Master Curve method. Testing with air considered to segregate effect of
tap water on fatigue life.
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Fatigue Testing and Life Estimates of Welded Flat Head Pressure Vessel Joints (July 2006)
Presentation slides of fatigue analysis research conducted at Paulin Research Group research
facility. The testing considered cylindrical shells with flat heads subject to cycling
internal pressure. Application of finite element analysis (FEA) methods are also presented
with comparisons against fatigue allowables from various pressure vessel design codes.
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