Experimental study of low-cycle fatigue of pipe elbows with local wall thinning and life estimation using finite element analysis

Takahashi, Koji; Tsunoi, Satoshi; Hara, Takumi; Ueno, Takahiro; Mikami, Akira; Takada, Hajime; Ando, Kotoji; Shiratori, Masaki

doi:10.1016/j.ijpvp.2010.03.022

Cited by 39 publications

(10 citation statements)

References 7 publications

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“…It is concluded that elbows with thinning at the extrados have stronger resistance to low cycle fatigue failure compared to elbows with thinning at the crown and intrados. Low cycle fatigue lives predicted via FE analyses based on strain criteria correlated well with test results [17].…”

Section: Review Of Literaturesupporting

confidence: 60%

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Effect of local wall thinning on shakedown regimes of pressurized elbows subjected to cyclic in-plane and out-of-plane bending

Oda

Megahed

Abdalla

2015

International Journal of Pressure Vessels and Piping

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Section: Review Of Literaturesupporting

confidence: 60%

“…Varelis et al [11] Takahashi et al [16,17] conducted experimental tests and FE analyses to investigate low cycle fatigue of thinned-wall carbon steel elbows subjected to cyclic in-plane bending in the absence of internal pressure. Thinning is located at the extrados/crown/intrados.…”

Section: Review Of Literaturementioning

confidence: 99%

Effect of local wall thinning on shakedown regimes of pressurized elbows subjected to cyclic in-plane and out-of-plane bending

Oda

Megahed

Abdalla

2015

International Journal of Pressure Vessels and Piping

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“…To investigate the fracture behavior of elbow piping, many repeated load tests of elbow piping have been conducted. (Sakakida et al, 2000;Nuclear Power Engineering Corp, 2001;Otani et al, 2011;Takahashi et al, 2009;Takahashi et al, 2010).…”

Section: )mentioning

confidence: 99%

Low-cycle fatigue behavior of stainless-steel elbows having local wall thinning

Ashiba

Koizumi

Takahashi

et al. 2020

Mechanical Engineering Journal

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Elbow pipes present a complex stress field during deformation. The stress field becomes more complicated due to the wall thinning. Thus, predicting their failure behavior is difficult. In previous studies, low-cycle fatigue tests were performed on carbon steel elbow pipes, and a revised universal slope method was proposed to predict their fatigue lives. However, the accuracy of predictions has not been verified on materials other than carbon steel. Therefore, in this study, low-cycle fatigue tests and a finite-element analysis were performed on carbon steel (STPT410) and stainless steel (SUS304) elbows. The low-cycle fatigue life of SUS304 elbows was observed to be three to four times longer than that of STPT410 elbows. Analysis of results revealed that the fatigue life predicted by the revised universal slope method shows a tendency similar to the experimental results, and the fatigue life of SUS304 can be predicted with high accuracy as well as STPT410.

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“…This work has been extended on the bending behavior of externally pressurized induction bends, used in offshore pipe applications as reported by Pappa et al [9]. Takakashi et al [10] performed in plane-bending low-cycle fatigue tests on pipe elbows specimens with local wall thinning, due to metal loss from erosion corrosion. More recently, the low-cycle fatigue of pipe elbows, subjected to severe cyclic loading, has been investigated experimentally and numerically by Varelis et al [11], [12].…”

Section: Introductionmentioning

confidence: 99%

CFRP Reinforcement and Repair of Steel Pipe Elbows Subjected to Severe Cyclic Loading

Skarakis

Chatzopoulou

Karamanos

et al. 2017

Journal of Pressure Vessel Technology

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In order to ensure safe operation and structural integrity of pipelines and piping systems subjected to extreme loading conditions, it is often necessary to strengthen critical pipe components. One method to strengthen pipe components is the use of composite materials. The present study is aimed at investigating the mechanical response of pipe elbows, wrapped with carbon fiber-reinforced plastic (CFRP) material, and subjected to severe cyclic loading that leads to low-cycle fatigue (LCF). In the first part of the paper, a set of LCF experiments on reinforced and nonreinforced pipe bend specimens are described focusing on the effects of CFRP reinforcement on the number of cycles to failure. The experimental work is supported by finite element analysis presented in the second part of the paper, in an attempt to elucidate the failure mechanism. For describing the material nonlinearities of the steel pipe, an efficient cyclic-plasticity material model is employed, capable of describing both the initial yield plateau of the stress–strain curve and the Bauschinger effect characterizing reverse plastic loading conditions. The results from the numerical models are compared with the experimental data, showing an overall good comparison. Furthermore, a parametric numerical analysis is conducted to examine the effect of internal pressure on the structural behavior of nonreinforced and reinforced elbows, subjected to severe cyclic loading.

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Experimental study of low-cycle fatigue of pipe elbows with local wall thinning and life estimation using finite element analysis

Cited by 39 publications

References 7 publications

Effect of local wall thinning on shakedown regimes of pressurized elbows subjected to cyclic in-plane and out-of-plane bending

Effect of local wall thinning on shakedown regimes of pressurized elbows subjected to cyclic in-plane and out-of-plane bending

Low-cycle fatigue behavior of stainless-steel elbows having local wall thinning

CFRP Reinforcement and Repair of Steel Pipe Elbows Subjected to Severe Cyclic Loading

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