Mechanics of self-healing thermoplastic elastomers

Yu, Kunhao; Xin, An; Feng, Zhangzhengrong; Lee, Kyung Hoon; Wang, Qiming

doi:10.1016/j.jmps.2019.103831

Cited by 46 publications

(21 citation statements)

References 68 publications

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“…The ribbons, considered as a thin plate, have been an interesting and fruitful playground to investigate the singular behavior of thin sheets under more or less complicated loading conditions [21][22][23]. Most of the theoretical and numerical studies usually consider stiff materials under mild tension, thus, satisfying the condition of inextensibility [24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Extreme contractility and torsional compliance of soft ribbons under high twist

Chopin

Filho

2019

Phys. Rev. E

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We investigate experimentally and model the mechanical response of a soft Hookean ribbon submitted to large twist η and longitudinal tension T , under clamped boundary conditions. We derive a formula for the torque M using the Föppl-von Kàrmàn equations up to third order in twist, incorporating a twist-tension coupling. In the stable helicoid regime, quantitative agreement with experimental data is obtained. When twisted above a critical twist ηL(T ), ribbons develop wrinkles and folds which modify qualitatively the mechanical behavior. We show a surprisingly large longitudinal contraction upon twist, reminiscent of a Poynting effect, and a much lower torsional stiffness. Far from threshold, we identify two regimes depending on the applied T . In a high-T regime, we find that the torque scales as η · T and the contraction as η 2 , in agreement with a far from threshold analysis where compression and bending stresses are neglected. In a low-T regime, the contraction still scales as η 2 but the torque appears T -independent and linear with η. We argue that the large curvature of the folds now contribute significantly to the torque. This regime is discussed in the context of asymptotic isometry for very thin plates submitted to vanishing tension but large change of shape, as in crumpling.arXiv:1603.02081v2 [cond-mat.soft]

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Section: Introductionmentioning

confidence: 99%

Extreme contractility and torsional compliance of soft ribbons under high twist

Chopin

Filho

2019

Phys. Rev. E

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“…A few elegant examples are provided by plants and fungi, which have evolved ingenious mechanisms with elastic instabilities, cavitation, and fracture [1][2][3][4][5]. The same physical principles are often found in man-made applications including ancient catapults, children's toys, smart materials and robotics [6][7][8][9][10][11][12][13][14][15][16][17][18][19].…”

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confidence: 99%

Twist-Induced Snapping in a Bent Elastic Rod and Ribbon

Sano

Wada

2019

Phys. Rev. Lett.

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“…Besides looking at stages of self-repair for autonomous control, there are also theoretical and computational approaches looking into providing effective guidelines to optimize the design and synthesis of self-healing materials. [321][322][323][324] Theoretical models look specifically into one or more of the five stages of crack healing [24] and predict the chemistry at which a dynamic bond forms and breaks in a specific chemical environment. [293,324,325] With this understanding, simulations are not only done to predict how SHPs sense when it is deformed or damage but also, actuate repair when subjected to a specific self-healing trigger.…”

Section: Self-healing System In Robot Versus Human Skinmentioning

confidence: 99%

“…[293,324,325] With this understanding, simulations are not only done to predict how SHPs sense when it is deformed or damage but also, actuate repair when subjected to a specific self-healing trigger. [321,323,326] Variations of the test conditions on the healing rate and repeatability of healing upon fracture can be forecasted before actual synthesis and implementation. An example could be a creation of smart self-healing materials with one or more types of dynamic bonds in the polymer such that material properties such as self-healing could be controlled by different types of triggers.…”

Section: Self-healing System In Robot Versus Human Skinmentioning

confidence: 99%

Progress and Roadmap for Intelligent Self‐Healing Materials in Autonomous Robotics

et al. 2020

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self-repair in order to survive and thrive. Soft to hard tissues can self-regenerate when injured, including the skin and bones. [6] Some of the living tissues, such as nails and bones, can even continuously remodeling themselves, removing the damaged tissues unintentionally and replaced by newly grown tissues. However, unlike regenerative and remodeling capabilities in nature, robots are made from nonliving synthetic materials such as polymers and metals. Hence, as we develop robots to have greater autonomy and capabilities, having the ability to self-heal or self-repair is becoming more critical, if not, essential, especially from an environmental sustainability point of view. [2,[7][8][9][10][11] The term self-healing materials, also often referred to as self-mending or selfrepairing materials, are materials that can regain some or most of its original material properties when damaged. In synthetic materials, the self-healing materials repair their damage without regenerative origins. As these selfhealing materials undergo self-repair, they regain their original intended functions through the recovery of the desired material properties, without an increase in original mass.As the number of self-healing materials is growing at a rapid clip, we first establish a brief history in this review to help the reader gain a broader perspective on self-healing materials. We emphasize on self-healing materials that recover their mechanical properties, because mechanical properties often dictate the possible applications. Figure 1 highlights the various selfhealing materials from high modulus to low modulus materials that can be used for robotic applications.There are two broad classifications for self-healing materials: a) autonomic versus nonautonomic self-healing materials; b) intrinsic versus extrinsic self-healing. [8] These self-healing materials can recover their properties either autonomously, i.e., without significant external intervention, much like human tissues; or they can also heal with external intervention, such as when some external environment changes cause temperature increment or via various triggers such as mechanical stimuli. Intrinsic self-healing materials do not need external healing agents, while extrinsic self-healing materials contain external healing agents for the healing of the matrix materials. In addition to those classifications, we will provide new insights on classifying these materials further into this review.In Section 2, we discuss various types of smart biomimetic robots where self-healing materials can be beneficial. Section 3 Robots are increasingly assisting humans in performing various tasks. Like special agents with elite skills, they can venture to distant locations and adverse environments, such as the deep sea and outer space. Micro/nanobots can also act as intrabody agents for healthcare applications. Self-healing materials that can autonomously perform repair functions are useful to address the unpredictability of the environment and the increasing drive toward the autonom...

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Mechanics of self-healing thermoplastic elastomers

Cited by 46 publications

References 68 publications

Extreme contractility and torsional compliance of soft ribbons under high twist

Extreme contractility and torsional compliance of soft ribbons under high twist

Twist-Induced Snapping in a Bent Elastic Rod and Ribbon

Progress and Roadmap for Intelligent Self‐Healing Materials in Autonomous Robotics

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