Post-impact mechanical characterization of HMPE yarns

Belloni, Eduarda da Silva; Clain, Fernanda Mazuco; Guilherme, Carlos Eduardo Marcos

doi:10.14311/ap.2021.61.0406

Cited by 6 publications

(8 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For polyester, in [17], the value of 233.8 tex can be found. And for the HMPE, in [15], a linear density of 176.4 tex was found.…”

Section: Linear Density For Multifilamentsmentioning

confidence: 92%

“…Although there is no data in the literature for all torsional conditions, the results presented in Table 2 can be compared to specific literature cited in the introduction [15][16][17]. In the reference works, a breaking force for HMPE of 500.84 Newtons with a standard deviation of 16.37 Newtons was measured [15], but the torsion used was not specified, although the need for adherence to the standard suggests that it was 60 turns per metre. For polyamide, the average breaking strength found for an untwisted condition was 210.47 N with a standard deviation of 3.78 N [16].…”

Section: Yarn Breaking Load For Torsion Groupsmentioning

confidence: 99%

“…This is because YBL serves as a parameter for several other mechanical characterisation tests, such as impact, creep, abrasion, fatigue, quasi-static stiffness, and dynamic stiffness. As load, they usually use a specific percentage of the standard YBL breaking load, as seen in several works that attest YBL as a parameter for performing other mechanical characterisation tests on multifilaments [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Due to this standard, most of the papers that show the YBL in the experimental data use either 60 twists per metre or no twists at all. To provide break values (YBL) that serve as a reference for each material, the results from the cited literature can be used, [15] for HMPE, [16] for polyamide, and [17] for polyester.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Experimental study of the torsional effect for yarn break load test of polymeric multifilaments

2022

View full text Add to dashboard Cite

Polymeric multifilaments have gained a significant interest in recent decades. In the studies of mechanical characteristics, although there are different types of tests, such as rupture, abrasion, creep, impact and fatigue, it can be said that the main mechanical characterisation is the tensile rupture strength (Yarn Break Load, YBL), which also serves as a parameter for other tests. The objective of this work is to evaluate the results of breaking strength under different torsional conditions in polymeric multifilaments and to determine optimal twists for failures. The test were carried out with the following materials: polyamide, polyester, and high modulus polyethylene (HMPE), and for torsional conditions: 0, 20, 40, 60, 120, 240, and 480 turns per metre. As a result, for these torsion groups, curves were obtained for the three materials that present an optimal point of maximum rupture value, which was also experimentally proven. The twist that optimises the breaking strength of HMPE is 38 turns per metre, 56 turns per metre for polyester, and 95 turns per metre for polyamide. The twist groups that exceed the optimal torsion have a deleterious effect on the material, where the multifilament ceases to be homogeneous and starts to create an excessive "spring effect". The results found differ from the recommendation of the standard that regulates the YBL test, and thus, a relationship is built between groups of optimal torsion and linear density that provides evidence that the increase in linear density causes the optimal torsion for rupture to also increase, while the standard places a condition of 30 turns per metre for linear densities greater than 2200 dtex, and 60 turns per metre for linear densities less than 2200 dtex. In addition to optimal torsion values, this conclusion is paramount, the test procedure makes a general recommendation that does not optimise the breaking strength.

show abstract

“…For polyester, in [17], the value of 233.8 tex can be found. And for the HMPE, in [15], a linear density of 176.4 tex was found.…”

Section: Linear Density For Multifilamentsmentioning

confidence: 92%

Section: Yarn Breaking Load For Torsion Groupsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Experimental study of the torsional effect for yarn break load test of polymeric multifilaments

2022

View full text Add to dashboard Cite

show abstract

“…The dynamic requests that act under these anchor cables have gained scientific focus, studying fatigue and impact loads that act on such systems. Sometimes these studies address conditions of combined loads, such as mechanical characterization after impact loading (Belloni et al, 2021). Other times they address environmental conditions such as temperature and humidity associated with dynamic loading.…”

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

View full text Add to dashboard Cite

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.

show abstract

Analysis of the multi-filament high-performance yarns’ dynamic failure for impact resistance enhancement

El Messiry,

Eltahan,

Fathy

2024

Journal of Engineered Fibers and Fabrics

View full text Add to dashboard Cite

The dynamic failure behavior of multifilament high-performance yarns plays a crucial role in determining the impact resistance of advanced materials used in diverse applications such as aerospace, automotive, and protective textiles. The falling tower setup was designed to investigate the impact behavior of high-performance yarns. These models offer valuable insights into the fundamental mechanisms governing yarn failure. The force-time curves of different yarn samples under various impact energies show that Kevlar and Vectran® have the highest values of impact-resisting force, 21.9 and 21.6 N, respectively. The resisting impact energy reaches between 3.5 and 4 mJ. Enhancement of the multifilament yarn’s impact resistance was achieved through applications of silicone finishes or hybrid yarns, in which the impact resistance force and time to failure exhibited an increase across various yarn types. The ratio of impact yarn resisting force to yarn tenacity was determined to be 6.73%, 6.05%, 11.29%, and 1.71% for Vectran, Kevlar 29, polyester, and carbon yarns, respectively. Additionally, their specific yarn impact toughness was measured at 2.69, 1.32, 0.54, and 0.16 mJ/tex. The application of a 20% silicon coating increased their specific yarn impact toughness to 11.81, 5.79, 3.58, and 0.51 mJ/tex, respectively. Hybrid continuous fibers are composite materials that blend various fiber types, including carbon, Kevlar, Vectran®, or polyester, to form a material with enhanced impact absorption energy, such as in the case of Kevlar/PET or Carbon-PET. The outcomes of these investigations substantially contribute to enhancing multi-filament high-performance yarns in various practical applications in systems subjected to dynamic loads.

show abstract

Post-impact mechanical characterization of HMPE yarns

Cited by 6 publications

References 13 publications

Experimental study of the torsional effect for yarn break load test of polymeric multifilaments

Experimental study of the torsional effect for yarn break load test of polymeric multifilaments

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

Analysis of the multi-filament high-performance yarns’ dynamic failure for impact resistance enhancement

Contact Info

Product

Resources

About