Fracture mechanics evaluation of cracked components with consideration of multiaxiality of stress state

Schuler, Xaver; Blind, D.; Eisele, U.; Herter, Karl-Heinz; Stoppler, W.

doi:10.1016/0029-5493(94)90176-7

Cited by 16 publications

(9 citation statements)

References 3 publications

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“…This raises the question on transferring the fracture parameters from specimens to the component level. It has been found that constraint/stress triaxiality ahead of crack tip influences the J-R curves (Joyce and Link, 1997;Schuler et al, 1994;Eisele et al, 1994). The standards for fracture testing often enforce high-constraint conditions in the specimens to obtain a conservative index of material toughness.…”

Section: Comparison Of Crack Initiation Loadmentioning

confidence: 94%

“…Investigations (Joyce and Link, 1997;Schuler et al, 1994;Eisele et al, 1994) have shown that (J i ) SZW is more or less independent of stress triaxiality and can be treated as a material property. Hence, it is possible to predict the crack initiation loads by comparing (J i ) SZW determined from the laboratory specimen with the calculated crack driving force (applied J-integral) of the cracked component.…”

Section: Comparison Of Crack Initiation Loadmentioning

confidence: 96%

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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: Comparison Of Crack Initiation Loadmentioning

confidence: 94%

Section: Comparison Of Crack Initiation Loadmentioning

confidence: 96%

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 plastic strain is a strong function of deformation than the stress in 316LN SS material. The formation of SZW is a deformation process and independent of stress triaxiality, and which is in turn mainly dependent on the uniform strain associated with crack blunting (Clausmeyer et al, 1991;Schuler et al, 1994; authors own publication in ASM-JMEP 2014). Therefore, the true uniform strain (i.e.…”

Section: Crack Bluntingmentioning

confidence: 98%

Coupled FEM and experimental analysis to characterize initial crack growth regime in AISI 316L(N) stainless steel

Krishnan

Moitra

Sasikala

et al. 2015

International Journal of Structural Integrity

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Purpose – The purpose of this paper is to present a methodology to predict initial crack growth behavior of crack or notch like stress raisers in AISI 316L(N) stainless steel material subjected to monotonic loading condition. Design/methodology/approach – The methodology for critical crack blunting corresponding to crack initiation in crack or notch like stress raisers is based on critical plastic strain (Epc) at a characteristic distance (lc), where uniform strain (Eu) is considered as Epc and two grain diameter is considered as lc. Further crack growth is based on parabolic crack tip opening displacement (CTOD) scheme established based on coupled experimental and FEM analysis of compact tension (CT) specimen subjected to mode-I loading condition. The FEM predicted load-displacement plots is compared with experimental result of CT specimens with different a/W ratios. It has shown that the proposed methodology could account initial crack blunting appropriately and predict the fracture load and load-displacement plots for initial crack growth regime. Findings – The results show that for crack growth with near straight crack front, experimental data from a CT specimen of particular a/W ratio coupled with plane strain 2D FEM analysis could predict load vs displacement plots for different a/W ratios when initial crack blunting is accounted appropriately with a local damage model. Originality/value – The present study is a part of developing methods to analyse fracture behavior of AISI 316L(N) SS material components used for fast breeder reactor-based power plant being built at Kalpakkam, India.

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“…This raises the question of transferring fracture parameters from specimens to component level. It has been found that crack-tip constraint or crack tip triaxility influences the J R curves (Schuler et al 1994). The standards for fracture testing often enforce high constraint conditions in specimens to obtain a conservative index of material toughness.…”

Section: Introductionmentioning

confidence: 98%

Micromechanical modelling of weldments using GTN model

et al. 2010

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Non-transferability of fracture data from specimen level to component level is a serious limitation of conventional fracture mechanics, as fracture resistance data obtained is largely geometry dependant. The difficulty is largely overcome by GTN model which models the drop in load carrying capacity of a material with the increase in plastic strain, considering nucleation, growth and coalescence of micro-voids in the material. However, determination of the modelparameters with experiments is extremely difficult and doubtful. Hence, a parameter-study has been done to find out the effects of different parameters on material behaviour to asses the parameter for best practical result with least metallographic study. The parameters were finally verified by predicting ductile fracture in a real life piping component.

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Fracture mechanics evaluation of cracked components with consideration of multiaxiality of stress state

Cited by 16 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

Coupled FEM and experimental analysis to characterize initial crack growth regime in AISI 316L(N) stainless steel

Micromechanical modelling of weldments using GTN model

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