Evaluation of the Fatigue Response of Polyester Yarns After the Application of Abrupt Tension Loads

Louzada, Emilio Luiz Vieira; Guilherme, Carlos Eduardo Marcos; Stumpf, Felipe Tempel

doi:10.14311/app.2017.7.0076

Cited by 6 publications

(10 citation statements)

References 2 publications

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“…For example, polyester has an LT of 0.733 N/tex, whereas HMPE has an LT of ∼ 3 N/tex. However, a similar behaviour is observed for aramid fibres [1,14,15]. HMPE is rigid because of its high macromolecular orientation and crystallinity [3].…”

Section: Yarn Breaking Loadsupporting

confidence: 65%

“…For the drop-weight impact tests, a drop-weight test tower, previously built in the laboratory, was used, as shown in Figure 2 [15]. To obtain the impact force overtime, a ±10 kN load cell was mounted at the upper end of the equipment with the data acquisition frequency of 5 kHz [20].…”

Section: Methodsmentioning

confidence: 99%

“…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%

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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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Section: Yarn Breaking Loadsupporting

confidence: 65%

Section: Methodsmentioning

confidence: 99%

Section: No /mentioning

confidence: 99%

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Post-impact mechanical characterization of HMPE yarns

Belloni¹,

Clain

Guilherme

2021

Acta Polytech

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“…It is noteworthy that polymers in general do not have a database as vast and solid as classical materials applied in engineering. In addition, they have mechanical behavior, sometimes non-linear, which makes studies a challenge for engineers (Louzada et al, 2017). For this reason, in the study of synthetic fibers, experimental approaches are commonly used (Sry et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

Experimental study on the behavior of polyamide multifilament subject to impact loads under different soaking conditions

Cruz¹,

Silva²,

Clain³

et al. 2023

10.5267/j.esm

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This article studies the mechanical characterization of impact loads on polyamide fibers. Using synthetic ropes in mooring systems, these are subject to static loads, but dynamic loads are also expected. One of the dynamic loads that can occur on cables are sudden loads, which makes the analysis of impact loads important. In this study, impact cycles were applied to polyamide multifilaments until rupture with different impact masses, and considering the conditions: dry, after 6 hours of immersion in water and after 24 hours of immersion in water. The analysis of the immersed conditions allows us to interpret the plasticizing effect that moisture exerts in polyamide, through loss stiffness in the rupture test. The results show that the increase in immersion time represents decrease in the breaking strength, and also in the resistance to impact cycles. A curve parameterization is proposed that relates the number of impact cycles and the percentage of Yarn Break Load used in the impact, getting through the coefficient of determination the best model. For force versus time graphs, obtained in each impact cycle, the energy dissipation in the multifilament can be observed in two main mechanisms: the first is the elastic deformation in form of ricochets, the second is the plastic deformation by stretching/elongation. The force-time graphs of impact cycles and the number of impact cycles to failure are measures that show performance for impact dynamic loads. Attention should be the plasticizing effect caused by water, as it reduces the static and dynamic mechanical strength of polyamide.

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“…However, it represents a relevant topic in regards to synthetic fibres used for mooring and operation lines since during its lifetime, an anchoring or operation line might be exposed to such loads several times. One important factor that influences the capacity to support shock loads is the degree of crystallinity, which is inversely proportional to the resistance to high, instantaneous tensile forces [18,19].…”

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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Evaluation of the Fatigue Response of Polyester Yarns After the Application of Abrupt Tension Loads

Cited by 6 publications

References 2 publications

Post-impact mechanical characterization of HMPE yarns

Post-impact mechanical characterization of HMPE yarns

Experimental study on the behavior of polyamide multifilament subject to impact loads under different soaking conditions

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

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