Deformation behavior of thermoplastic elastomer specimens: Observation of the strain behavior in a wide range of tensile speeds

Isogai, Yumiko; Yokoyama, Akira; Nguyễn, Thị Thanh Bình; Sumiyama, Takuya; Fruich, Kenji; Nonomura, Chisato

doi:10.1002/pen.24792

Cited by 7 publications

(3 citation statements)

References 47 publications

(63 reference statements)

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“…2A). This was consistent with an increase in the yield strength and the elastic modulus in thermoplastic materials with increasing deformation rate (29,30). For a given fiber, the spring diameter and the spring index of the actuators formed by cold drawing were controlled by the deformation rate and the maximum applied strain (Fig.…”

supporting

confidence: 80%

Strain-programmable fiber-based artificial muscle

Kanık

Orguc²,

Varnavides

et al. 2019

Science

354

202

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Artificial muscles may accelerate the development of robotics, haptics, and prosthetics. Although advances in polymer-based actuators have delivered unprecedented strengths, producing these devices at scale with tunable dimensions remains a challenge. We applied a high-throughput iterative fiber-drawing technique to create strain-programmable artificial muscles with dimensions spanning three orders of magnitude. These fiber-based actuators are thermally and optically controllable, can lift more than 650 times their own weight, and withstand strains of >1000%. Integration of conductive nanowire meshes within these fiber-based muscles offers piezoresistive strain feedback and demonstrates long-term resilience across >10 5 deformation cycles. The scalable dimensions of these fiber-based actuators and their strength and responsiveness may extend their impact from engineering fields to biomedical applications.

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supporting

confidence: 80%

Strain-programmable fiber-based artificial muscle

Kanık

Orguc²,

Varnavides

et al. 2019

Science

354

202

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“…Strength and stiffness of polymers' materials depend on the strain rate. Abdo et al [30,31] and Isogai et al [32] incorporated thermoplastic polyester elastomers (TTPE) into short, glass fiber-reinforced PBT samples in order to investigate the strain speed dependence. The results indicated that ultimate tensile strength is sensitive to strain rate.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Moduli of Polybutylene Terephthalate Glass Fiber Reinforced in High-Temperature Environments

et al. 2021

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The aim of this work was to show the evolution over time of the dynamic moduli in components made of Polybutylene Terephthalate reinforced with glass fiber when they are held to temperatures close to the glass transition temperature over time. For this purpose, PBT samples reinforced with short, glass fibers of Ultradur® material with 0%, 20%, and 50% in weight content were tested. Dynamic moduli showed an increment with glass fiber content showing a nonlinear behavior with the temperature. The evolution of storage modulus was depicted by means of a modified law of mixtures with an effectiveness factor depending on temperature and fiber content, whereas the evolution over time was obtained with a time–temperature transformation generated with the TTS Data Analysis software of TA-instruments for a given temperature. Storage modulus showed a linear relationship with glass fiber content when components were held to temperatures near to their respective glass transition temperature, obtained from the maximum of loss modulus curve with temperature. In summary, the value and evolution of dynamic moduli of PBT samples improved with glass fiber content, allowing us to increase the durability of components when they are submitted to high-temperature environments.

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“…In general, the total stress of TPEs can be divided into elastic and viscous parts, and the strain rate effect is mainly reflected in affecting the viscous stress contribution. The Eyring model, proposed by Eyring and modified by many other researchers, has been utilized to describe the viscous stress adequately, which depends on strain rate whether in semicrystalline polymers, amorphous polymers, or TPEs . In particular, the relationship between yield stress and strain rate has been given accurately by this model .…”

Section: Introductionmentioning

confidence: 99%

Structural origin for the strain rate dependence of mechanical response of fluoroelastomer F2314

Chang

Lin

Chen

et al. 2019

J Polym Sci B Polym Phys

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The structural evolution of fluoroelastomer F2314 is studied during uniaxial tensile in a large strain rate range (0.1–150 s−1) with the combination of a homemade high‐speed stretching device and in situ small‐ and wide‐angle X‐ray scattering techniques. Based on the mechanical behaviors and structural evolutions, three strain rate regions (I–III) are defined. The microphase‐separated structure plays an important role in the mechanical response of F2314. In Region I, deformation of soft domains is the main process before yielding, accompanied by the destruction of lamellar crystals in hard domains. In the stress plateau zone, deformation of hard domains is confirmed as the primary mechanism of energy dissipation. With the orientation parameter of the amorphous phase reaching a critical value, strain hardening is triggered. Recrystallization also takes place in strain hardening zone. In Region II, due to the mismatch between the mobility of molecular chains in hard domains and the acting time of stress, large deformation of hard domains is more and more difficult to occur with the disappearance of recrystallization. In Region III, as almost all molecular chains have no time to adjust or relax to fit the stress field, the sample presents a brittle fracture. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 607–620

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Deformation behavior of thermoplastic elastomer specimens: Observation of the strain behavior in a wide range of tensile speeds

Cited by 7 publications

References 47 publications

Strain-programmable fiber-based artificial muscle

Strain-programmable fiber-based artificial muscle

Dynamic Moduli of Polybutylene Terephthalate Glass Fiber Reinforced in High-Temperature Environments

Structural origin for the strain rate dependence of mechanical response of fluoroelastomer F2314

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