Crack initiation and growth behaviour of circumferentially cracked pipes under cyclic and monotonic loading

Singh, Pawan Kumar; Vaze, K.K.; Bhasin, V.; Kushwaha, H. S.; Gandhi, P.; Murthy, D. S. Ramachandra

doi:10.1016/s0308-0161(03)00132-7

Cited by 36 publications

(48 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…There is no such reported work on austenitic stainless steel pipes that fracture resistance depends on the prior loading histories, or fatigue loading before conducting fracture tests. Similar studies conducted on carbon steel pipes showed that fracture resistance of pipe depends on the prior loading histories to which pipe has been subjected 13 . One such comparison in terms of bending moment versus rotation and fracture resistance ( J – R ) curve for pre‐cracked and fatigue‐tested pipe weld is shown in Figs.…”

Section: Resultsmentioning

confidence: 77%

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

View full text Add to dashboard Cite

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 ...

show abstract

Section: Resultsmentioning

confidence: 77%

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

View full text Add to dashboard Cite

show abstract

“…Tensile samples were prepared from the same pipe material straight pipes. The cyclic stress-strain and low cycle fatigue properties are obtained from literature [4]. Eqn.…”

Section: Materials Properties and Pipe Test Datamentioning

confidence: 99%

“…The Eqn. 3 is reportedly [4] obtained using three-point bend specimen machined from the same pipe material.…”

Section: Materials Properties and Pipe Test Datamentioning

confidence: 99%

Fatigue life prediction analysis of surface cracked straight pipes

Saxena

Ramakrishnan

Chouhan³

2009

Trans Indian Inst Met

View full text Add to dashboard Cite

In piping components, for the stability assessment it is important to calculate the point of initiation of the crack and to monitor the subsequent crack propagation behaviour. The objective of this paper is to use the finite element method backed up with experimental results to determine the crack initiation stage and to subsequently predict the crack propagation behaviour under fatigue loading. With reference to full scale surface cracked carbon steel pipes tested data, the accuracy of the numerical procedure is judged. It is concluded that semi-elliptical SIFs solutions should not be used to assess the fatigue life when straight pipe is having constant depth crack profile.

show abstract

“…To assess possible structural damage, fatigue crack initiation, growth behavior and resistance of cracked pipes under cyclic loading have been studied in [30]. A failure analysis of a hydraulic pipe due to resonance condition as a form of energy dissipation resulting from viscous friction has been presented in [31], where a crack structural damage was assessed due to the corrosion of the pipe and the reach of maximal admissible stress.…”

Section: Introductionmentioning

confidence: 99%

Non-destructive testing and assessment of dynamic incompatibility between third-party piping and drain valve systems: an industrial case study

Kong

Noroozi

Rahman

et al. 2014

Nondestructive Testing and Evaluation

View full text Add to dashboard Cite

This paper presents the outcome of an industrial case study that involved condition monitoring of piping system that showed signs of excess fatigue due to flow induced vibration. Due to operational requirements a novel non-destructive assessment stratagem was adopted using different vibration analysis techniquessuch as Experimental Modal Analysis (EMA) and Operating Deflection Shapes (ODS) -and complemented by visual inspection. Modal analysis performed near a drain valve showed a dynamic weakness problem (several high frequency flow induced vibration frequency peaks) hence Condition Based Monitoring (CBM) was used.This could easily be linked to design problem associated with the dynamic incompatibility due to dissimilar stiffness between two 3 rd party supplied pipe and valve systems. It was concluded that this is the main cause for these problem types especially when systems are supplied by third parties, but assembled locally, a major cause of dynamic incompatibility. It is the local assembler's responsibility to develop skills and expertise needed to sustain the operation of these plants. This paper shows the technique used as result of one such initiative. Since high amplitude, low frequency displacement can cause low cycle fatigue, attention must be paid to ensure flow remains as steady-state as possible. The ability to assess the level of design incompatibility and the level of modification required using non-destructive testing is vital if these systems are to work continuously.

show abstract

Crack initiation and growth behaviour of circumferentially cracked pipes under cyclic and monotonic loading

Cited by 36 publications

References 7 publications

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

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

Fatigue life prediction analysis of surface cracked straight pipes

Non-destructive testing and assessment of dynamic incompatibility between third-party piping and drain valve systems: an industrial case study

Contact Info

Product

Resources

About