Strain-Controlled Biaxial Tension of Natural Rubber: New Experimental Data

Pancheri, Francesco Q.; Dorfmann, Luis

doi:10.5254/rct.13.87902

Cited by 15 publications

(8 citation statements)

References 26 publications

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“…The machine controls strain measured from the specimen in real time to within a tolerance of 0.25% by independently modulating the applied load at each actuator drive. Details and layout of the equipment are given in Pancheri and Dorfmann (2013).…”

Section: Mechanical Testingmentioning

confidence: 99%

A constitutive description of the anisotropic response of the fascia lata

Pancheri

Eng

Lieberman

et al. 2014

Journal of the Mechanical Behavior of Biomedical Materials

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In this paper we propose a constitutive model to analyze in-plane extension of the fascia lata in goats. We first perform a histological analysis of the fascia that shows a well-organized bi-layered arrangement of undulated collagen fascicles oriented along two well defined directions. To develop a model consistent with the tissue structure we identify the absolute and relative thickness of each layer and the orientation of the preferred directions. New data are presented showing the mechanical response in uniaxial and planar biaxial extension. The main part of the paper focuses on a constitutive theory to describe the mechanical response. We provide a summary of the main ingredients of the nonlinear theory of elasticity and introduce a suitable strain-energy function to describe the anisotropic response of the fascia. In the final part of the paper we validate the model by showing good agreement of the numerical results and the experimental data.

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Section: Mechanical Testingmentioning

confidence: 99%

A constitutive description of the anisotropic response of the fascia lata

Pancheri

Eng

Lieberman

et al. 2014

Journal of the Mechanical Behavior of Biomedical Materials

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“…Several specific forms of strain-energy functions can be defined to describe the hyperelastic properties [28,29].…”

Section: Numerical Simulations: Constitutive Modeling and Inversementioning

confidence: 99%

Integrated Experimental and Numerical Comparison of Different Approaches for Planar Biaxial Testing of a Hyperelastic Material

Avanzini

Battini

2016

Advances in Materials Science and Engineering

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Planar biaxial testing has been applied to a variety of materials to obtain relevant information for mechanical characterization and constitutive modeling in presence of complex stress states. Despite its diffusion, there is currently no standardized testing procedure or a unique specimen design of common use. Consequently, comparison of results obtained with different configurations is not always straightforward and several types of optimized shapes have been proposed. The purpose of the present work is to develop a procedure for comprehensive comparison of results of biaxial tests carried out on the same soft hyperelastic material, using different types of gripping methods and specimen shapes (i.e., cruciform and square). Five configurations were investigated experimentally using a biaxial test rig designed and built by the authors, using digital imaging techniques to track the displacements of markers apposed in selected positions on the surfaces. Then, material parameters for a suitable hyperelastic law were determined for each configuration examined, employing an inverse method which combines numerical simulations with the finite element method (FEM) and optimization algorithms. Finally, efficiency of examined biaxial configurations was assessed comparing stress reductions factor, degree and uniformity of biaxial deformation, and operative strain ranges.

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“…Biaxial tests with strain control were performed using a custom built Zwick/Roell planar biaxial testing system (Ulm, Germany) 18 . The sample was attached to the four linear Figure 3B).…”

Section: Biaxial Testingmentioning

confidence: 99%

Directional Differences in the Biaxial Material Properties of Fascia Lata and the Implications for Fascia Function

et al. 2014

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Fascia is a highly organized collagenous tissue that is ubiquitous in the body, but whose function remains an enigma. Because fascia has a sheet-like structure attaching to muscles and bones at multiple sites, it is exposed to different states of multi-or biaxial strain. In order to measure how biaxial strain affects fascia material properties, planar biaxial tests with strain control were performed on longitudinal and transversely oriented samples of goat fascia lata (FL). Cruciform samples were cycled to multiple strain levels while the non-cycling perpendicular direction was held at a constant strain. Structural differences among FL layers were examined using histology and SEM. Results show that FL modulus, hysteresis, and strain energy density are greater in the longitudinal versus transverse direction. Increased stiffness in the longitudinal layer is likely due to its greater thickness and greater average fibril diameter compared to the transverse layer(s). Perpendicular strain did not affect FL material properties.Differential loading in the longitudinal versus transverse directions may lead to structural changes, enhancing the ability of the longitudinal FL to transmit force, store energy, or stabilize the limb during locomotion. The relative compliance of the transverse fibers may allow expansion of underlying muscles when they contract.

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Strain-Controlled Biaxial Tension of Natural Rubber: New Experimental Data

Cited by 15 publications

References 26 publications

A constitutive description of the anisotropic response of the fascia lata

A constitutive description of the anisotropic response of the fascia lata

Integrated Experimental and Numerical Comparison of Different Approaches for Planar Biaxial Testing of a Hyperelastic Material

Directional Differences in the Biaxial Material Properties of Fascia Lata and the Implications for Fascia Function

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