Temperature and strain rate dependent large tensile deformation and tensile failure behavior of transparent polyurethane at intermediate strain rates

Liao, Zisheng; Yao, Xiongliang; Zhang, L.; Hossain, Mokarram; Wang, Jiong; Zang, Shuguang

doi:10.1016/j.ijimpeng.2019.03.005

Cited by 57 publications

(26 citation statements)

References 30 publications

(51 reference statements)

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“…In this section, similar to the investigation of the strain rate dependence, the influences of temperature on these two stress portions are also tested, respectively. Several researches illustrate that mechanical properties of silicone polymers are sensitive to temperature variations [12,29,30]; although such types of dependence are not as pronounced as other polymers such as acrylics [31]. Therefore, we have conducted a couple of cyclic tests within the temperature chamber.…”

Section: Temperature Dependencementioning

confidence: 99%

A comprehensive thermo-viscoelastic experimental investigation of Ecoflex polymer

et al. 2020

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Silicone polymers have enormous applications, especially in the areas of biomedical engineering. Ecoflex, a commercially available room temperature cured silicone polymer, has attracted considerable attention due to its wide range of applications as medical-grade silicones and as matrix materials in producing nano-filled stretchable sensors and dielectric elastomers for soft robotics. In this contribution, we have conducted a wide range of experiments under thermo-mechanical loadings. These experiments consist of loading-unloading cyclic tests, single-step relaxation tests, Mullins effects tests at different strain rates and stretches, stress recovery tests at different rest time etc. In order to assess the temperature influences on Ecoflex, a number of viscoelastic tests are performed in a thermal chamber with temperature ranging from-40 • C to 140 • C. Extensive experimental findings illustrate that Ecoflex experiences a significant stress softening in the first cycles and such a softening recovers gradually with respect to time. It also shows a significant amount of cyclic dissipation at various stretch levels as well as a considerable stress relaxation only for virgin samples. Cyclic dissipations and stress relaxation almost disappear for the case of pre-stretched samples. Furthermore, the material is more or less sensitive under a wide range of temperature differences.

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Section: Temperature Dependencementioning

confidence: 99%

A comprehensive thermo-viscoelastic experimental investigation of Ecoflex polymer

et al. 2020

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“…where Ω eq is the augmented form already defined in (22). The constitutive equations are given by the derivatives of Ω as,…”

Section: Kinematic Assumptions and Constitutive Lawsmentioning

confidence: 99%

“…The relevant equations are based on the pioneering works of 18-20 among others. This work aims at developing a continuum field theory for the behaviour of magnetically sensitive materials that experience viscoelasticity, see for example 21,22 . Indeed, the response to magnetic stimuli can in general not be instantaneous for all MAPs as that has been established experimentally, e.g.…”

Section: Introductionmentioning

confidence: 99%

A modelling framework for finite strain magnetoviscoelasticity

Nedjar

2019

Mathematics and Mechanics of Solids

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The main objective of this contribution is the theoretical modelling of magnetizable materials that exhibit viscoelastic properties. The current state of the art in the mathematical modelling of non-linear magnetomechanics in deformable media can be easily integrated within the unified framework of continuum thermodynamics, which is crucial in setting the convenient forms for the constitutive laws and evolution equations. Owing to the soft nature of the materials we have in mind, the finite strain range is adopted a priori and, in this first approach, only isotropic materials are considered. We adopt the currently well-accepted multiplicative split of the deformation gradient, which, moreover, gives rise to an intermediate configuration. Herein, the novelty resides in the fact that the magnetic field vectors are transported onto the aforementioned intermediate configuration and, therefore, can be implicitly decomposed. The proposed formulation is based on the magnetic induction as the main independent variable for the magnetic part of the problem. An alternative formulation based on the magnetic field as main independent variable can easily be deduced, but this latter will not be considered in this paper for the sake of clarity. A very simple model example that agrees with the laws of thermodynamics is proposed for the purpose of demonstration to study some phenomena qualitatively.

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“…The methods are assessed in terms of their numerical accuracy through comparison with known analytical solutions for both material and spatial configurations. Most materials include some aspect of inelasticity, such as viscoelasticity, plasticity, damage, or a combination of these behaviors . However, only hyperelasticity is considered here for simple constitutive models with known analytical solutions.…”

Section: Numerical Investigationmentioning

confidence: 99%

Higher‐order and higher floating‐point precision numerical approximations of finite strain elasticity moduli

Connolly

Mackenzie

Gorash

2019

Numerical Meth Engineering

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Two real-domain numerical approximation methods for accurate computation of finite strain elasticity moduli are developed and their accuracy and computational efficiency are investigated, with reference to hyperelastic constitutive models with known analytical solutions. The methods are higher-order and higher floating-point precision numerical approximation, the latter being novel in this context. A general formula for higher-order approximation finite difference schemes is derived and a new procedure is proposed to implement increased floating-point precision. The accuracy of the approximated elasticity moduli is investigated numerically using higher-order approximations in standard double precision and increased quadruple precision. It is found that, as the order of the approximation increases, the elasticity moduli tend toward the analytical solution. Using higher floating-point precision, the approximated elasticity moduli for all orders of approximation are found to be more accurate than the standard double precision evaluation of the analytical moduli.Application of the techniques to a finite element problem shows that the numerically approximated methods obtain convergence equivalent to the analytical method but require greater computational effort. It is concluded that numerical approximation of elasticity moduli is a powerful and effective means of implementing advanced constitutive models in the finite element method without prior derivation of difficult analytical solutions.

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Temperature and strain rate dependent large tensile deformation and tensile failure behavior of transparent polyurethane at intermediate strain rates

Abstract: Temperature and strain rate dependent large tensile deformation and tensile failure behavior of transparent polyurethane at intermediate strain rates. International

Cited by 57 publications

References 30 publications

A comprehensive thermo-viscoelastic experimental investigation of Ecoflex polymer

A comprehensive thermo-viscoelastic experimental investigation of Ecoflex polymer

A modelling framework for finite strain magnetoviscoelasticity

Higher‐order and higher floating‐point precision numerical approximations of finite strain elasticity moduli

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