Improved quasi-static twin-fiber transverse compression of several high-performance fibers

Guo, Zherui; Chen, Weinong; Zheng, James

doi:10.1177/0040517518775927

Cited by 7 publications

(7 citation statements)

References 29 publications

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“…The yarn specimens used in this study were strands of Twaron ® 2040 yarns extracted from plain weave single ply CT 709 Twaron ® in the warp direction. The quasi-static mechanical properties of this yarn were determined in previous studies and are tabulated in Table 1 [12,13]. Table 1.…”

Section: Methodsmentioning

confidence: 99%

“…Mechanical properties of Twaron ® 2040 yarn and the razor blade. The mechanical properties of Twaron ® 2040 were adapted from [12][13][14].…”

Section: Methodsmentioning

confidence: 99%

“…Experimental work performed by Guo et al [14] indicated that at high-rate, the dynamic transverse modulus for PPTA fiber increased by 2.95 times compared to that of the quasi-static. Therefore, in this study, it was assumed that the transverse modulus for Twaron ® 2040 yarn also increased by a similar order of magnitude [13,14]. The projectile was made from steel with a Young's modulus of 200 GPa.…”

Section: Hertzian Contact Modelmentioning

confidence: 99%

“…The normalized indentation depth (α) is defined as the difference between the projectile and yarn displacements normalized by the yarn diameter (2r y ) as given in Equation (13). Figure 7 shows the normalized indentation depth at several striking velocities.…”

Section: Hertzian Contact Modelmentioning

confidence: 99%

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Critical Velocity of High-Performance Yarn Transversely Impacted by Razor Blade

Lim

Chu

Claus

et al. 2018

Fibers

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A ballistic parameter that influences the ballistic performances of a high-performance yarn is the critical velocity. The critical velocity is defined as the projectile striking velocity that causes instantaneous rupture of the yarn upon impact. In this study, we performed ballistic experiments to determine the critical velocity of a Twaron® yarn transversely impacted by a razor blade. A high-speed camera was integrated into the experimental apparatus to capture the in-situ deformation of the yarn. The experimental critical velocity demonstrated a reduction compared to the critical velocity predicted by the classical theory. The high-speed images revealed the yarn specimen failed from the projectile side toward the free end when impacted by the razor blade. To improve the prediction capability, the Euler–Bernoulli beam and Hertzian contact models were used to predict the critical velocity. For the Euler–Bernoulli beam model, the critical velocity was obtained by assuming the specimen ruptured instantaneously when the maximum flexural strain reached the ultimate tensile strain of the yarn upon impact. On the other hand, for the Hertzian contact model, the yarn was assumed to fail when the indentation depth was equivalent to the diameter of the yarn. The errors between the average critical velocities determined from experiments and the predicted critical velocities were around 19% and 48% for the Euler–Bernoulli beam model and Hertzian contact model, respectively.

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Section: Methodsmentioning

confidence: 99%

“…Mechanical properties of Twaron ® 2040 yarn and the razor blade. The mechanical properties of Twaron ® 2040 were adapted from [12][13][14].…”

Section: Methodsmentioning

confidence: 99%

Section: Hertzian Contact Modelmentioning

confidence: 99%

Section: Hertzian Contact Modelmentioning

confidence: 99%

See 2 more Smart Citations

Critical Velocity of High-Performance Yarn Transversely Impacted by Razor Blade

Lim

Chu

Claus

et al. 2018

Fibers

View full text Add to dashboard Cite

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“…However, these studies noted a significant difference between the indentation modulus and the transverse modulus calculated via the stiffness coefficients, with this difference reported to vary depending on the microstructure of the CF [23]. Other studies have compressed the fibre between two flat surfaces and measured the displacement during compression using a capacitor [24,25] or linear differential transformer [7] external to the region where fibre deformation is occurring. For these systems, the machine compliance of the equipment between the deformation region and the displacement detector must be estimated and may result in an error in the final result.…”

Section: Introductionmentioning

confidence: 99%

Direct Measurement of the Transverse Modulus of Carbon Fibres

et al. 2022

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Background The transverse compressive properties are integral to fully utilizing the high performing mechanical properties of carbon fibres (CF). Direct measurements of transverse properties of CFs are difficult. Objective A system that directly measures transverse compressive modulus (ET) by utilizing interference speckle patterns to measure sub-pixel resolutions is presented. Methods The compression data from an isotropic glass fibre was fitted using an elastic contact mechanics model. An initial section was observed, which was not readily fitted using the model and was systematically removed, resulting in an ET of 82 GPa, comparable to the reported longitudinal tensile modulus (EL) of 86 GPa. Results The response of Ag wire to cyclic compression was measured, with the behaviour consistent with a material undergoing typical cyclic stress–strain into a stable hysteretic loop. Several CFs were compressed and an inversely proportional relationship between ET and EL was observed. Transverse compressive moduli of 8.2 (0.8), 6.5 (0.7), 4.3 (0.3), and 2.1 (0.4) were obtained for Toray T300 and Mitsubishi Pyrofil HS40, Pyrofil TR50S, and Dialead K13312, respectively (numbers in parenthesis are standard deviations). Conclusion Hysteresis was observed for some of the polyacrylonitrile (PAN)-based CFs and a method for ensuring an accurate fitting of CFs, including hysteretic load/unload curves, was proposed.

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