Computational fatigue assessment of mooring chains under tension loading

Perez, Imanol Martinez; Constantinescu, Andréï; Bastid, Philippe; Zhang, Yanhui; Venugopal, Vengatesan

doi:10.1016/j.engfailanal.2019.06.073

Cited by 8 publications

(4 citation statements)

References 50 publications

(91 reference statements)

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“…Yield strengths, 𝑅 p0.2 , from position 5 of link 1 and 2 were measured to be 823 and 846 MPa, respectively. In both of the current test programs, it was assumed that any residual stresses from production of mooring chains [22,23] were relaxed during cutting of the specimens, and that any residual stresses that were introduced during machining were erased by material removal during the precorrosion phase.…”

Section: Specimen Preparationmentioning

confidence: 99%

Effect of long periods of corrosion on the fatigue lifetime of offshore mooring chain steel

et al. 2022

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Section: Specimen Preparationmentioning

confidence: 99%

Effect of long periods of corrosion on the fatigue lifetime of offshore mooring chain steel

et al. 2022

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“…Researching the behavior of ship mooring chains on shore has been an important objective for different groups of researchers [13][14][15][16][17][18][19][20][21][22][23][24][25][26]. The static, dynamic, and fatigue stresses occurring in the chain links for different operating conditions were thus highlighted.…”

Section: Introductionmentioning

confidence: 99%

“…From those mentioned above, it can be seen that until now, the research related to the chain links made of metallic and non-metallic materials has focused on the establishment of the dimensions of these chain links [1,7,[31][32][33], the efforts generated in the chain links during operation [8,18,25,26,31], the modeling by the finite element method or by other methods of the stresses and deformations from chain links during their mechanical loading [9,[12][13][14][15]18,19], investigating the fatigue behavior of chain links [20][21][22].…”

Section: Introductionmentioning

confidence: 99%

Tensile Behavior of Chain Links Made of Polymeric Materials Manufactured by 3D Printing

et al. 2023

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For reduced mechanical stress, some chains with links made of metallic materials could be replaced by chains made of polymeric materials. A lower weight and a higher corrosion resistance would characterize such chains. From this point of view, research on the behavior of chain links made of polymeric materials under the action of tensile stresses can become important. Modeling by the finite element method highlighted some specific aspects of the behavior of a chain link subjected to tensile stresses. Later, we resorted to the manufacture by 3D printing of some chain links from four distinct polymeric materials, with the modification of the size of the chain link and, respectively, of the values of some of the input factors in the 3D printing process. The tensile strength of the chain links was determined using specialized equipment. The experimental results were processed mathematically to determine some empirical mathematical models that highlight the influence of the values of the input factors in the 3D printing process on the tensile strength of the samples in the form of chain links. It thus became possible to compare the results obtained for the four polymeric materials considered and identify the polymeric material that provides the highest tensile strength of the sample in the form of a chain link. The results of the experimental research showed that the highest mechanical resistance was obtained in the case of the links made of polyethylene terephthalate glycol (PETG). According to experimental results, when tested under identical conditions, PETG links can break for a force value of 40.9 N. In comparison, polylactic acid links will break for a force value of 4.70 N. Links printed in the horizontal position were almost 9-fold stronger than those printed in the vertical position. Under the same test conditions, according to the determined empirical mathematical models, PETG links printed in a horizontal position will break for a force of 300.8 N, while links printed in a vertical position will break for force values of 35.8 N.

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“…A proposed MSR model was then used to predict fatigue initiation times and locations in hemispherical notches. Half of the specimens had compressive residual surface stresses, induced by an initial overload, to replicate the stress state found in a crown of an offshore mooring chain link 22,23 . Fatigue initiation life and locations were verified from fatigue tests by continuous monitoring with digital image correlation (DIC).…”

Section: Introductionmentioning

confidence: 99%

Effect of cyclic softening and mean stress relaxation on fatigue crack initiation in a hemispherical notch

Qvale

Zarandi

Arredondo

et al. 2022

Fatigue Fract Eng Mat Struct

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Corroded surfaces of offshore mooring chains typically show a very irregular shape with different pit geometries. Fatigue tests were performed in threepoint bending on specimens with hemispherical notches, representing an idealized geometry of a corrosion pit. Digital image correlation was used to detect crack initiation lives and locations. The aim of the study was to quantify mean stress relaxation (MSR) and its influence on fatigue initiation life. MSR data were obtained from strain-controlled fatigue tests on R4-grade offshore mooring chain steel. Interestingly, MSR was observed even at a stress amplitude below the cyclic yield stress. For initiation lives below 100,000 cycles, significant improvement in predictions was obtained if cyclic softening and MSR were accounted for. Using only the monotonic stress-strain curve led to less accurate predictions. For longer lives, scatter in the base material S-N data and residual stresses from machining of the notch made predictions less accurate.

show abstract

Computational fatigue assessment of mooring chains under tension loading

Cited by 8 publications

References 50 publications

Effect of long periods of corrosion on the fatigue lifetime of offshore mooring chain steel

Effect of long periods of corrosion on the fatigue lifetime of offshore mooring chain steel

Tensile Behavior of Chain Links Made of Polymeric Materials Manufactured by 3D Printing

Effect of cyclic softening and mean stress relaxation on fatigue crack initiation in a hemispherical notch

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