Topologically controlled tensile behaviour of braided prostheses for anterior cruciate ligaments

Rawal, Amit; Sibal, Apurv; Saraswat, Harshvardhan; Khan, Siyam Quddus

doi:10.1016/j.jmbbm.2016.01.033

Cited by 6 publications

(5 citation statements)

References 24 publications

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“…The axial strain and the filament strain can be related to each other by combining equations 1.2 2.7, which stem from the geometrical analysis of a helical wrapping. Thus, we can obtain the yarn strain according to 21,22 , (2.8)…”

Section: Range IImentioning

confidence: 99%

Stretchable Conductive Materials Based On Braided Cnt Yarns On Elastomeric Core

Bar

Mead

Dodiuk

et al. 2022

Preprint

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The mechanical properties of braided carbon nanotube yarns (CNTYs) on an elastomeric core to produce stretchable conductive materials were modeled and studied under tension. The elastomeric core served as the stretchable spring and the CNTYs braiding, with shape changing capabilities, as the conductive shell. The model predicts the stress-strain behavior of the composite as a function of the initial braiding angle and the number of pitches. The innovative aspect was included in the model related to the friction between the braid and the core. Results indicated good agreement between the theoretical model and the experimental results. Since the rate of the diameter decrease of the CNTYs braid was higher than that of the elastomeric core diameter, squeezing out of the core through the braid inter yarn space occurred. This limited the maximum potential extension of the braid. Thus, a critical strain was defined where the braid came into contact with the core. The addition of the friction stresses made a significant contribution to the overall stresses and the accuracy of the model and its agreement with the experimental results. An apparent friction coefficient was proposed to account for the effect of the elastomer core/braid interactive restriction and squeezing out of the elastomer through the braiding, as observed in experimental results. As the CNTYs are conductive, a stretchable conductive composite was obtained having a resistivity of 9.05x10-4 Ohm*cm, which remained constant throughout the tensile loading until failure and under cyclic loading.

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Section: Range IImentioning

confidence: 99%

Stretchable Conductive Materials Based On Braided Cnt Yarns On Elastomeric Core

Bar

Mead

Dodiuk

et al. 2022

Preprint

View full text Add to dashboard Cite

show abstract

“…1.2 and 2.7, which stem from the geometrical analysis of a helical wrapping. Thus, we can obtain the yarn strain according to [21,22],…”

Section: Range IImentioning

confidence: 99%

Mechanical behavior of stretchable conductive materials based on elastomeric core: experimental and theoretical simulation

Bar

Mead

Dodiuk

et al. 2022

Functional Composite Mater

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The mechanical behavior of braided carbon nanotube yarns (CNTYs) on an elastomeric core to produce stretchable conductive materials were theoretically modeled and experimentally studied under tension. The elastomeric core served as the stretchable spring and the CNTYs braiding, with shape changing capabilities, as the conductive shell. A variety of samples were produced having various braiding angles on an elastomeric core and subsequently loaded in tension, and their stress–strain behavior was characterized. The model predicts the stress–strain behavior of the composite as a function of the initial braiding angle and the number of pitches. The innovative aspect was included in the model related to the friction between the braid and the core. Results indicated good agreement between the theoretical simulations and the experimental results which was not discussed in previous studies. Since the rate of the diameter decrease of the CNTYs braid was higher than that of the elastomeric core diameter, squeezing out of the core through the braid inter yarn space occurred. This limited the maximum potential extension of the braid. Thus, a critical strain was defined where the braid came into contact with the core. The addition of the friction stresses made a significant contribution to the overall stresses and the accuracy of the theoretical simulation, and its agreement with the experimental results. An apparent friction coefficient was proposed to account for the effect of the elastomer core/braid interactive restriction and squeezing out of the elastomer through the braiding, as observed in experimental results. As the CNTYs are conductive, a stretchable conductive composite was obtained having a resistivity of 9.05 × 10–4 Ohm*cm, which remained constant throughout the tensile loading until failure and under cyclic loading.

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“…The axial strain and the yarn strain can be related using the geometry of a helical wrapping. Thus, according to Rawal et al , and including an interactive-restraining parameter ζ, the strain in the fiber, ε f , is ε normalf = true[ false( 1 + ζ ε z false) 2 cos 2 ( α i ) + sin 2 ( α i ) false( 1 + ζ ε z false) true] 0.5 − 1 …”

Section: Introductionmentioning

confidence: 99%

“…The axial strain and the yarn strain can be related using the geometry of a helical wrapping. Thus, according to Rawal et al 34 , 35 and including an interactive-restraining parameter ζ, the strain in the fiber, ε f , is …”

Section: Introductionmentioning

confidence: 99%

Stretchable Conductive Tubular Composites Based on Braided Carbon Nanotube Yarns with an Elastomer Matrix

et al. 2022

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We report an innovative approach to creating stretchable conductive materials composed of a tubular shell made from braided carbon nanotube yarns (CNTYs) embedded in an elastomeric matrix. For stretchable electronics, both mechanical properties and electrical conductivities are of interest. Consequently, both the mechanical behavior and electrical conductivities under large deformations were investigated. A new hyperelastic composite model was developed to predict the large deformation response to applied stress for a braid in a tubular elastomer composite. The composite demonstrated a hyperelastic response due to the architecture of the braid, and the behavior was affected by the braiding angle, braid modulus, and volume fraction of fibers. The elastomer matrix was considered a neo-Hookean material and represented by the Yeoh model. An interaction parameter was proposed to account for the effect of the elastomer/braid cooperative restriction as observed in experimental and calculated results. This novel approach enabled the determination of the constitutive behavior of the composite in large deformations (>150%), taking into account the elastomer and yarn properties and braid configurations. The model exhibited good agreement with the experimental results. As the CNTYs are conductive, a stretchable conductive composite was obtained having a resistivity of 5.01 × 10 −4 and 5.67 × 10 −5 Ω•cm for the 1-ply and 4-ply composites, respectively. The resistivity remained constant through cyclic loading under large deformations in tension until mechanical failure. The material has potential for use in stretchable electronics applications.

show abstract

Topologically controlled tensile behaviour of braided prostheses for anterior cruciate ligaments

Cited by 6 publications

References 24 publications

Stretchable Conductive Materials Based On Braided Cnt Yarns On Elastomeric Core

Stretchable Conductive Materials Based On Braided Cnt Yarns On Elastomeric Core

Mechanical behavior of stretchable conductive materials based on elastomeric core: experimental and theoretical simulation

Stretchable Conductive Tubular Composites Based on Braided Carbon Nanotube Yarns with an Elastomer Matrix

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