French experimental studies of circumferentially through-wall cracked austenitic pipes under static bending

Moulin, D.; Delliou, Patrick Le

doi:10.1016/0308-0161(94)00146-a

Cited by 19 publications

(15 citation statements)

References 3 publications

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“…Similar type of tests on pipes and its analysis had been reported by several researchers e.g. Moulin and Delliou (1996), Kashima et al (1990), Wilkowski et al (1989), Roos et al (2000), Darlaston et al (1992) and Forster et al (1996). In the present work, tests are conducted on carbon steel pipes under four point bend loading using computer controlled servo-hydraulic actuator of ±1 MN capacity.…”

Section: Test Arrangementmentioning

confidence: 57%

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Some recent developments on integrity assessment of pipes and elbows. Part II: Experimental investigations

Chattopadhyay

Kushwaha

Roos

2006

International Journal of Solids and Structures

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Integrity assessment of piping components is very essential for safe and reliable operation of power plants. Over the last several decades, considerable work has been done throughout the world to develop a methodology for integrity assessment of pipes and elbows, appropriate for the material involved. However, there are scope of further development/improvement of issues, particularly for pipe bends, that are important for accurate integrity assessment of piping. Considering this aspect, a comprehensive Component Integrity Test Program was initiated in 1998 at Reactor Safety Division (RSD) of Bhabha Atomic Research Centre (BARC), India in collaboration with MPA, Stuttgart, Germany through Indo-German bilateral project. In this program, both theoretical and experimental investigations were undertaken to address various issues related to the integrity assessment of pipes and elbows. The important results of the program are presented in this two-part paper. In the part II of the paper, the experimental investigations are discussed. Part I covered the theoretical investigations. Under the experimental investigations, fracture mechanics tests have been conducted on pipes and elbows of 200-400 mm diameter with various crack configurations and sizes under different loading conditions. Tests on small tensile and three point bend specimens, machined from the tested pipes, have also been done to evaluate the actual stress-strain and fracture resistance properties of pipe/elbow material. The loaddeflection curve and crack initiation loads predicted by non-linear finite element analysis matched well with the experimental results. The theoretical collapse moments of throughwall circumferentially cracked elbows, predicted by the recently developed equations, are found to be closer to the test data compared to the other existing equations. The role of stress triaxialities ahead of crack tip is also shown in the transferability of J-resistance curve from specimen to component.

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Section: Test Arrangementmentioning

confidence: 57%

“…Moulin and Delliou (1996) suggest a reduction factor of Ô0.85Õ to the Eq. (1) to take care of the crack propagation at maximum moment.…”

Section: Straight Pipementioning

confidence: 99%

Some recent developments on integrity assessment of pipes and elbows. Part II: Experimental investigations

Chattopadhyay

Kushwaha

Roos

2006

International Journal of Solids and Structures

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“…The crack extension direction is along the crack plane in a circumferential direction for pipe as well as pipe welds. Moulin and Delliou 2 have shown that crack extension in pipes change direction after crack initiation whereas in the case of pipe welds cracks propagate in the same plane. Our findings show that crack extensions in pipe and pipe welds (GTAW) do not deviate from the original crack plane i.e.…”

Section: Resultsmentioning

confidence: 99%

“…The crack extension direction is along the crack plane in a circumferential direction for pipe as well as pipe weld. Moulin and Delliou 2 have shown that fracture resistance of pipe weld (SMAW) is lower than that of pipe.…”

Section: Resultsmentioning

confidence: 99%

“…Thirdly, there is a considerable range of scatter in the fracture toughness data of welds in the standard specimen test because of limited stable crack growth. Austenitic stainless steel material is one of the examples that have considerable scatter 2 . Therefore, there is a need to evaluate the crack resistance behaviour of cracked austenitic stainless steel pipes and pipe welds.…”

Section: Introductionmentioning

confidence: 99%

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Crack resistance of austenitic stainless steel pipe and pipe welds with a circumferential crack under monotonic loading

Singh

Vaze

Ghosh

et al. 2006

Fatigue Fract Eng Mat Struct

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A B S T R A C T This paper describes the experimental studies carried out on cracked austenitic stainless steel pipe and pipe welds under bending loads. Pipe welds were produced by gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW). Fracture resistance curves for pipe and pipe welds were compared. Results indicate that the fracture resistance of pipe and pipe weld (GTAW) is comparable but that of pipe weld (GTAW+SMAW) is inferior. Cracks do not deviate from their original plane during propagation as observed in the cases of carbon steel pipe and pipe welds. The fracture resistance of pipe welds does not depend on the loading histories to which it has been subjected prior to fracture test. Initiation and crack propagation were observed prior to the maximum moment. An existing limit load expression is applicable for the pipe base material but gives non-conservative results for the pipe welds. Multiplication factors have been suggested for the pipe welds for evaluation of limit loads using the existing expression. Fracture resistance for the pipe and compact tension specimens have also been compared for base material and welds.Keywords austenitic stainless steel; gas tungsten arc welding (GTAW) and shielded metal arc welding (SMAW); fracture resistance; limit load; pipe; pipe welds. I N T R O D U C T I O NModern design and safety considerations require satisfaction of leak-before-break (LBB) criteria for high-energy piping system of nuclear power plants. Evaluation of the fracture the resistance of components and its point of instability is necessary for the demonstration of the safety case. High-energy piping systems in these plants use ductile and strain hardening materials. Fracture resistance of such materials can be characterized by the J-integral parameter, which takes into account extensive plastic deformation ahead of the defect under loading condition. A component integrity test program was started in Bhabha Atomic Research Centre (BARC), Mumbai to evaluate the application of LBB design criteria to the main heat transport system piping of the advanced heavy water reactors. Generally the fracture resistance of the material is evaluated according to the guidelines given in ASTM E1820 1 for semi ductile materials. But use of test results obtained using compact tension specimen, as in the ASTM E1820 standard, in component analysis remains subjective for Correspondence: P.K. Singh. E-mail: pksingh@barc.gov.in highly ductile materials because of the following reasons. Firstly, minimum thickness requirement for the determination of valid J IC is very high whereas pipes are usually much thinner. Secondly, the range of stable crack growth obtained from the standard compact tension (CT) or three-point bend (TPB) specimens is a few millimetres, which is small compared to that observed in components. Thirdly, there is a considerable range of scatter in the fracture toughness data of welds in the standard specimen test because of limited stable crack growth. Austenitic stainless steel material is one ...

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Non‐linear analysis of shells with arbitrary evolving cracks using XFEM

Areias

Belytschko

2004

Numerical Meth Engineering

157

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SUMMARYA new formulation and numerical procedures are developed for the analysis of arbitrary crack propagation in shells using the extended finite element method. The method is valid for completely non-linear problems. Through-the-thickness cracks in sandwich shells are considered. An exact shell kinematics is presented, and a new enrichment of the rotation field is proposed which satisfies the director inextensibility condition. To avoid locking, an enhanced strain formulation is proposed for the 4-node cracked shell element. A finite strain plane stress constitutive model based on the logarithmic corotational rate is employed. A cohesive zone model is introduced which embodies the special characteristics of the shell kinematics. Stress intensity factors are calculated for selected problems and crack propagation problems are solved.

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French experimental studies of circumferentially through-wall cracked austenitic pipes under static bending

Cited by 19 publications

References 3 publications

Some recent developments on integrity assessment of pipes and elbows. Part II: Experimental investigations

Some recent developments on integrity assessment of pipes and elbows. Part II: Experimental investigations

Crack resistance of austenitic stainless steel pipe and pipe welds with a circumferential crack under monotonic loading

Non‐linear analysis of shells with arbitrary evolving cracks using XFEM

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