Mechanical characterisation of polyurethane elastomer for biomedical applications

Kanyanta, Valentine; Ivanković, Alojz

doi:10.1016/j.jmbbm.2009.03.005

Cited by 143 publications

(91 citation statements)

References 34 publications

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“…They are either held rigidly in clamps (Kanyanta and Ivankovic, 2010;Waldman and Lee, 2005), or anchored with rotating rakes/sutures (Humphrey et al, 1990b). The difficulties associated with sutured specimens have been highlighted previously.…”

Section: Introductionmentioning

confidence: 99%

On the correct interpretation of measured force and calculation of material stress in biaxial tests

Nolan

McGarry

2016

Journal of the Mechanical Behavior of Biomedical Materials

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Section: Introductionmentioning

confidence: 99%

On the correct interpretation of measured force and calculation of material stress in biaxial tests

Nolan

McGarry

2016

Journal of the Mechanical Behavior of Biomedical Materials

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“…The spokes are paired and placed at equal intervals along the circumference of the Tweel. The spokes in the Bridgestone model have a special curve, arranged in an interlacing fashion [7]. This enables them to flex effectively without twisting while providing the strength of pneumatic tires.…”

Section: Dimensions and Constituent Materialsmentioning

confidence: 99%

“…The global seed size specified in ABAQUS is 0.1 for the shear layer and the tread. Uni-axial, bi-axial, and planar tension test results are shown in Figure 6(a) [7]. The three test results are used as a hyper-elastic material input of the polyurethane spokes in the FE ABAQUS code.…”

Section: Computational Modelingmentioning

confidence: 99%

Effect of Spokes Structures on Characteristics Performance of Non-Pneumatic Tires

Aboul-Yazid¹,

Emam²,

Shaaban³

et al. 2015

Int. J. Automot. Mech. Eng.

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In this paper, three different configurations of the Michelin's Tweel™, Resilient Technologies, and Bridgestone non-pneumatic tires (NPTs) are investigated by seeking compliant spoke structures. The quasi-static, two-dimensional analysis focuses on how the contact pressure, vertical tire stiffness and stresses are affected by the spoke structures and shear layer. Two cases of NPTs are investigated: (i) a tire with a composite ring and (ii) a tire without a composite ring. The results of the models were validated by comparison with four computational finite element models. The results showed that the shape of the spokes has a great effect on the tire's behavior in the second case, while the shear layer in the first case reduces the impact of the change of spokes shape especially in contact pressure distribution.

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“…Comparison of the stress-strain curves of the dynamic and quasi-static tests showed significant rate dependency. A similar experiment was conducted on polyurethane using a traditional SHTB system in combination with a pendulum striker (Kanyanta and Ivankovic, 2010). Nie et al (2008) developed a special clamping system in an SHTB in order to use a thin tubular shape specimen with a very short gauge length of 1 mm.…”

Section: Introductionmentioning

confidence: 99%

Application of the Virtual Fields Method to the uniaxial behavior of rubbers at medium strain rates

Yoon

Giannakopoulos

Siviour

2015

International Journal of Solids and Structures

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a b s t r a c tThe Virtual Fields Method (VFM) is used to explore strain-rate dependent mechanical properties of a hyperelastic material. In this method, the principle of virtual work is constructed to inversely obtain the Young's modulus and Poisson's ratio of a given material from optical measurements of displacement obtained during a dynamic loading event. The virtual displacement field is designed so that acceleration fields, and thereby inertial forces, are used to calculate the material properties, and the traction force term in the principle of virtual work can be eliminated. Experimentally, this means that no force measurements are required during dynamic loading. Prior to the experimental investigations, a simple analytical calculation and finite element model were used in order to simulate the method; the output from the VFM showed good agreement with the given material coefficients. For the experimental work, pure silicone rubber was chosen as a model material. This rubber was tested in tension using a drop-weight apparatus at a medium strain rate (c.a. 160 s À1 ), using high speed photography and Digital Image Correlation to provide strain and acceleration data which were subsequently analyzed by use of the VFM. By using static pre-stretching prior to the dynamic load, the hyperelastic behavior can be investigated up to large strains, even though the dynamic loading itself only has a small strain amplitude. By optimizing the differential one-term Ogden model to modulus estimations at each of the pre-stretching locations, the nonlinear stress-strain curves were reconstructed. The initial modulus change between these dynamic experiments and quasi-static tests was compared to the storage modulus increment obtained from DMA tests on the same material.

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Mechanical characterisation of polyurethane elastomer for biomedical applications

Cited by 143 publications

References 34 publications

On the correct interpretation of measured force and calculation of material stress in biaxial tests

On the correct interpretation of measured force and calculation of material stress in biaxial tests

Effect of Spokes Structures on Characteristics Performance of Non-Pneumatic Tires

Application of the Virtual Fields Method to the uniaxial behavior of rubbers at medium strain rates

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