Degradation and collapse of square tubes under cyclic bending

Vaze, Suhas; Corona, Edmundo

doi:10.1016/s0263-8231(98)00018-4

Cited by 36 publications

(19 citation statements)

References 11 publications

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“…The presence of ratcheting during cyclic loading may reduce the crack initiation life and thus the fatigue life of components (Rider et al, 1995;Wei et al, 2004;Lu, 2003), or may lead to structural collapse. The latter has been demonstrated for tubular structures by Shaw and Kyriakides (1985), Kyriakides and Shaw (1987), Corona and Kyriakides (1991), Vaze and Corona (1998), and for structural shapes by Bertero and Popov (1965), Ellison and Corona (1998) and Yin et al (2004), among others.…”

Section: Introductionmentioning

confidence: 75%

Evaluation of cyclic plasticity models in ratcheting simulation of straight pipes under cyclic bending and steady internal pressure

Rahman

Hassan

Corona

2008

International Journal of Plasticity

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115

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Section: Introductionmentioning

confidence: 75%

Evaluation of cyclic plasticity models in ratcheting simulation of straight pipes under cyclic bending and steady internal pressure

Rahman

Hassan

Corona

2008

International Journal of Plasticity

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115

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“…Metal structures are in many practical applications subjected to cyclic loads, which occasionally may be strong enough to induce repeated yielding of the material [1][2]. Gas transmission pipelines are often loaded by internal pressure fluctuations and external loading can be also present due to insufficient soil concretion, ground movement or presence of frequent road near the pipeline.…”

Section: Introductionmentioning

confidence: 99%

Behavior of Steel Branch Connections during Fatigue Loading

Sládek

Patek²,

Mičian

2017

Archives of Metallurgy and Materials

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Fatigue behavior of the branch connection made of low-alloyed steel with yield stress of 355 MPa during low-cycle bending test is investigated in the article. Numerical prediction of the stress and strain distribution are described and experimentally verified by fatigue test of the branch connection sample. Experimental verification is based on low-cycle bending testing of the steel pipes welded by manual metal arc process and loaded by external force in the appropriate distance. Stresses and displacement of the samples induced by bending moment were measured by unidirectional strain gauges and displacement transducers. Samples were loaded in different testing levels according to required stress for 2.10 6 cycles. Increase of the stress value was applied until the crack formation and growth was observed. Results showed a high agreement of numerical and experimental results of stress and displacement.

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“…Corona and Vaze (1996) studied the response, buckling and collapse of long, thin-walled seamless steel square tubes under bending. Vaze and Corona (1998) experimentally investigated the elastic-plastic degradation and collapse of steel tubes with square cross-sections under cyclic bending. Corona et al (2006) used a set of bending experiments to conduct on aluminum alloy tubes for investigating the yield anisotropy effects on the buckling.…”

Section: Introductionmentioning

confidence: 99%

Response of sharp-notched circular tubes under bending creep and relaxation

Lee¹,

Hsu

Pan

2014

Mechanical Engineering Journal

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In this paper, the response of sharp-notched circular tubes with notch depths of 0.2, 0.4, 0.6, 0.8 and 1.0 mm subjected to bending creep and relaxation are investigated. The bending creep or relaxation is to bend the tube to a desired moment or curvature and hold that moment or curvature constant for a period of time. From the experimental result of bending creep, the creep curvature and ovalization increase with time. In addition, higher held moment leads to the higher creep curvature and ovalization of the tube's cross-section. From the experimental result for bending relaxation, the bending moment rapidly decreases with time and becomes a steady value. As for the ovalization, the amount increases a little with time and gradually becomes a steady value. Due to the constant ovalization caused by the constant curvature under bending relaxation, the tube does not buckle. Finally, the formulation proposed by Lee and Pan (2002) is modified for simulating both the creep curvature-time relationship in the first stage under bending creep and the relaxation moment-time relationship under bending relaxation for sharp-notched circular tubes with different notch depths. Through comparing with the experimental finding, the theoretical analysis can reasonably describe the experimental result. Keywords IntroductionThe circular tube components, which are used in several industrial applications such as offshore pipelines, platforms in offshore deep water, tubular components in nuclear reactors, etc., are often subjected to bending. It is well known that the ovalization of the tube cross-section is observed when a circular tube is subjected to bending. If the bending moment or curvature increases, the ovalization also increases. Increase in ovalization causes a progressive reduction in the bending rigidity, which can result in buckling of the tube components. Therefore, the study of the response of circular tubes subjected to bending is of importance in many industrial applications.In early stage, Kyriakides and his co-workers designed and constructed a tube cyclic bending machine, and conducted a series of experimental and theoretical investigations. Shaw and Kyriakides (1985) investigated the inelastic behavior of 6061-T6 aluminum and 1018 steel tubes subjected to cyclic bending. Kyriakides and Shaw (1987) extended the analysis of 6061-T6 aluminum and 1018 steel tubes to the stability conditions under cyclic bending. Corona and Kyriakides (1988) investigated the stability of 304 stainless steel tubes subjected to combined bending and external pressure. Corona and Vaze (1996) studied the response, buckling and collapse of long, thin-walled seamless steel square tubes under bending. Vaze and Corona (1998) experimentally investigated the elastic-plastic degradation and collapse of steel tubes with square cross-sections under cyclic bending. Corona et al. (2006) used a set of bending experiments to conduct on aluminum alloy tubes for investigating the yield anisotropy effects on the buckling. Response of sharp-notched ci...

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Degradation and collapse of square tubes under cyclic bending

Cited by 36 publications

References 11 publications

Evaluation of cyclic plasticity models in ratcheting simulation of straight pipes under cyclic bending and steady internal pressure

Evaluation of cyclic plasticity models in ratcheting simulation of straight pipes under cyclic bending and steady internal pressure

Behavior of Steel Branch Connections during Fatigue Loading

Response of sharp-notched circular tubes under bending creep and relaxation

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