Preliminary Assessment of the Change in the Mechanical Behavior of Synthetic Yarns Submitted to Consecutive Stiffness Tests

Stumpf, Felipe Tempel; Guilherme, Carlos Eduardo Marcos; Chimisso, F. E. G.

doi:10.14311/app.2016.3.0075

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…Therefore, the aim of this paper is to provide an experimental-based prediction for the resistance of the main commercial synthetic fibres used for this application nowadays, by analyzing their endurance under certain cyclic loads. Seeking to predict the mechanical behaviour of the most commonly used synthetic fibres within this specific application, researches have been carried out to evaluate wear mechanisms such as creep at low temperatures [5] and stiffness [6] of these yarns. Thus, aiming to enhance the technical analysis on this paper, other tests besides fatigue were conducted, including creep, tensile and linear density (which allowed the determination of the linear tenacity).…”

Section: Introductionmentioning

confidence: 99%

Cyclic Stress Analysis of Polyester, Aramid, Polyethylene and Liquid Crystal Polymer Yarns

et al. 2016

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Abstract. Mooring ropes used in offshore oil platforms are exposed to a set of extreme environmental conditions that can be crucial to their behaviour in service. Considering the elevated mechanical demands on these ropes imposed by both the undersea environment and the station keeping of the vessel, this paper is focused on the experimental determination of the yarns fatigue behavior. In order to be able to foresee and compare their general wear rate, a diagram that correlates the force to which the specimens are submitted to the number of cycles for failure for each material is achieved. The analyzed fibers are Polyester, Aramid, Polyethylene and Liquid Crystal Polymer (henceforth quoted as PET, AR, PE and LCP, respectively), and this work followed a pattern composed by a fixed test frequency and an established maximum stress for the diagrams.

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Section: Introductionmentioning

confidence: 99%

Cyclic Stress Analysis of Polyester, Aramid, Polyethylene and Liquid Crystal Polymer Yarns

et al. 2016

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“…Post-impact mechanical characterization of HMPE yarns Moreover, similar investigations have shown the mechanical behaviour of the most commonly used synthetic fibres (polyester, polyamide, aramid), assessing creep at low temperatures [10], stiffness [11], and fatigue [12][13][14] of yarns. Within this context, Louzada et al [15] showed that the fatigue life of polyester yarns decreases after dynamic loadings, depending on the magnitude of the impact.…”

Section: No /mentioning

confidence: 99%

Post-impact mechanical characterization of HMPE yarns

Belloni¹,

Clain

Guilherme

2021

Acta Polytech

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The present work evaluates the mechanical behaviour of High Modulus Polyethylene (HMPE) yarns after being impacted by sudden axial loads. The influence of loading conditions on the structural integrity of yarns is assessed by tensile, fatigue, and creep tests before and after the impact events. The impact loads were inferred by drop-weight adopting a 300mm height and weights corresponding to 4, 5, and 6% of Yarn Breaking Load (YBL). At 5% YBL, most specimens fail after the impact, and at 6% YBL, all specimens fail. The application of 4% YBL tests results in enhanced creep and fatigue resistances and a decrease in the tensile resistance. Finally, a Scanning Electron Microscopy (SEM) analysis showed that the yarn filaments tend to straighten after the impact, while a decrease in their diameter is noticed due to the longitudinal deformation.

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“…Yarn-on-yarn abrasion is another (now a mechanical) degradation mechanism, even more relevant than the previous ones, that can affect the material's mechanical behaviour [7]. For characterisation purposes considering mooring ropes applications, static and dynamic stiffness of polymeric multifilaments are typically assessed according to ISO 18692 [8] and ISO 14909 [9,10].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of residual strength of polymeric yarns subjected to previous impact loads

et al. 2022

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The discovery of oil fields in deep and ultra-deep waters provided an opportunity to evaluate the use of synthetic ropes, complementarily or alternatively to traditional steel-based mooring lines in offshore units, mainly because of the former’s lower specific weight. Considering the series of complex dynamic-mechanical mainly axial loads to which these structures may be subjected, originated from different sources, such as wind, water current, tide, etc., there may be cases when at least one of these lines may possibly face an abrupt, shock-like axial load of considerably larger magnitude. The goal of the present study is to evaluate the residual tensile strength of three different synthetic yarns (polyester, and two grades of high modulus polyethylene) after exposure to such axial impact loads. It was observed that, for the tested materials, polyester is the one with the largest impact resistance to the conditions evaluated herein, mainly because of its comparatively greater energy absorption properties.

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Preliminary Assessment of the Change in the Mechanical Behavior of Synthetic Yarns Submitted to Consecutive Stiffness Tests

Cited by 4 publications

References 4 publications

Cyclic Stress Analysis of Polyester, Aramid, Polyethylene and Liquid Crystal Polymer Yarns

Cyclic Stress Analysis of Polyester, Aramid, Polyethylene and Liquid Crystal Polymer Yarns

Post-impact mechanical characterization of HMPE yarns

Evaluation of residual strength of polymeric yarns subjected to previous impact loads

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