Thermomechanical characterisation of cellular rubber

Seibert, Henning; Scheffer, Tobias; Diebels, Stefan

doi:10.1007/s00161-015-0491-9

Cited by 15 publications

(13 citation statements)

References 32 publications

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“…Special care was taken to produce the coupons used in their biaxial testing, and a number of material models were implemented, including the Mooney–Rivlin model, to better understand the response of hyperelastic materials to large deformations. The present investigation extends the previous studies by performing uniaxial and biaxial tests for a commonly used 3D printed photopolymer, TangoBlackPlus. The material coefficients of different material models are determined based upon uniaxial and biaxial testing data.…”

Section: Introductionsupporting

confidence: 60%

“…Uniaxial tests were performed and anisotropic material properties were identified. Biaxial testing of hyperelastic material has also been performed by Seibert et al . Special care was taken to produce the coupons used in their biaxial testing, and a number of material models were implemented, including the Mooney–Rivlin model, to better understand the response of hyperelastic materials to large deformations.…”

Section: Introductionmentioning

confidence: 99%

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Uniaxial and biaxial testing of 3D printed hyperelastic photopolymers

Morris

Rosenkranz

Seibert

et al. 2019

J of Applied Polymer Sci

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Uniaxial and biaxial testing of a three‐dimensional (3D) printed photopolymer (TangoBlackPlus) is performed. The nonlinear material response is studied using specially designed uniaxial and biaxial coupons. Experimental results show a quasi‐isotropic and hyperelastic behavior for longitudinal and transverse directions parallel to the 3D printer build plate. Uniaxial and biaxial testing data are fitted with commonly used hyperelastic material models. The material parameters derived for different material models are implemented into a finite element simulation to illustrate the effect of material models and testing conditions on the deflection of a curved hollow tube undergoing large deformation. HIGHLIGHTS Advanced three‐dimensional (3D) printing enabled a new sample design for uniaxial and biaxial test coupons. Uniaxial and biaxial tests were performed for TangoBlackPlus, a new photopolymer commonly used in 3D printing. Uniaxial and biaxial testing demonstrated an isotropic and hyperelastic material behavior for the different coupons' orientations studied. Biaxial testing enables a unique identification of the Mooney–Rivlin coefficients due to a large number of deformation states. Material coefficients were derived for different models and used as input parameters for finite element modeling. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48400.

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Section: Introductionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Uniaxial and biaxial testing of 3D printed hyperelastic photopolymers

Morris

Rosenkranz

Seibert

et al. 2019

J of Applied Polymer Sci

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“…It is based on a heterogeneous test that induces the three tests mentioned above and a wide range of intermediary loadings. This approach is further detailed in Promma et al and Guélon et al Such a heterogeneous biaxial test was also explored in Johlitz and Diebels and Seibert et al In these studies, several strategies have been used for the inverse identification of the constitutive parameters, either from the global quantities (force and/or displacement) or by coupling these global quantities with local ones, typically the kinematic field measured by using the DIC technique. In every case, the boundary conditions were required.…”

Section: Mechanical Behavior Of Rubber‐like Materials and Classical Tmentioning

confidence: 99%

Inverse identification of constitutive parameters from heat source fields: A local approach applied to hyperelasticity

Charlès

Cam

2020

Strain

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In this paper, a new inverse identification method of constitutive parameters is developed from full kinematic and thermal field measurements. It consists in reconstructing the heat source field from two different approaches by using the heat diffusion equation. The first one requires the temperature field measurement and the value of the thermophysical parameters. The second one is based on the kinematic field measurement and the choice of a thermo‐hyperelastic model that contains the parameters to be identified. The identification is carried out at the local scale, ie, at any point of the heat source field, without using the boundary conditions. In the present work, the method is applied to the challenging case of hyperelasticity from a heterogeneous test. Due to large deformations undergone by the rubber specimen tested, a motion compensation technique is developed to plot the kinematic and the thermal fields at the same points before reconstructing the heterogeneous heat source field. In the present case, the constitutive parameter of the Neo‐Hookean model has been identified, and its distribution has been characterized with respect to the strain state at the surface of a cross‐shaped specimen.

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“…This can be performed either by finite element simulations, where a constitutive model has to be assumed, or by experimental testing (or a combination of both). Shape optimization using finite elements might either be done by trial and error contour definitions, or by applying numerical tools from optimization …”

Section: Specimen's Shapementioning

confidence: 99%

“…Experimental characterization of a silicone rubber material, including biaxial tensile tests, is reported in Johlitz and Diebels, where the authors point out the necessity of multiaxial tests for the identification and good prediction of material models. Further studies on shape optimization and biaxial validation tests of polymeric elastomers can be found in Chen etal and Seibert et al, where different geometries of a one‐layer specimen have been tested. In this respect, we refer to Palacios‐Pineda et al as well, where shape optimization is applied to obtain a minimum equivalent strain difference at two points in the center of the specimen.…”

Section: Introductionmentioning

confidence: 99%

Basic studies in biaxial tensile tests

2018

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Biaxial tensile experiments are an increasing test alternative of thin‐walled specimens to characterize the material behavior under mechanical agencies. This is mainly driven by digital image correlation systems to obtain information about the surface deformation. However, it is not as simple as a tensile test since we can only measure the deformation in a region on the specimen and not the stress state. The latter aspect of stress determination is discussed as well. In this article, we address several basic questions. First: can we obtain a homogenous strain state in cruciform‐like specimens? In this sense the shape will be discussed and a measure of homogeneity is introduced for proofing whether homogeneity can be guaranteed. Second: how can we reach large strains in the center of the specimens? This is connected to the specimen's geometry (arm reinforcement, slots, thinning of center, …). Furthermore, we discuss the problem of material parameter identification using biaxial tensile test information, which is connected to the concept of identifiability using finite elements. This is discussed at the simplest constitutive model, namely linear isotropic elasticity. Thus, the overall goal is connected to a critical review on biaxial experiments using cruciform specimens. The test materials are polymers.

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Thermomechanical characterisation of cellular rubber

Cited by 15 publications

References 32 publications

Uniaxial and biaxial testing of 3D printed hyperelastic photopolymers

Uniaxial and biaxial testing of 3D printed hyperelastic photopolymers

Inverse identification of constitutive parameters from heat source fields: A local approach applied to hyperelasticity

Basic studies in biaxial tensile tests

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