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Title
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Experimental and numerical damage evolution of polyurethane material using a modified hyper-viscoelastic constitutive model
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Type
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Presentation
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Keywords
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Polyurethane, Hyper-viscoelastic model, Moony-Rivlin, Dynamic loading
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Abstract
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Recent investigations about the elastomeric polymer composites emphasized the positive effects of the contribution of elastomers to improve the performance of the protective structures. The unique mechanical and thermal properties and also the self-healing capability of this kind of materials make them remarkable to manufacture highly resilient protective systems. Investigations have shown that the performance of the composite structures with elastomeric polymer coating will significantly enhance their deformation and energy absorption capacity. The nonlinear behavior of elastomers makes major challenge in modeling and investigating the performance of these materials under dynamic loading. This nonlinear behavior caused by the long-chain molecular structure leads to hyper-viscoelastic properties of the elastomers. The characteristics of elastomers depend on different factors such as pressure, temperature and applied loading rate. Therefore, the mechanical behavior of elastomers alters by varying the applied loading rate. One of the most useful elastomers in industrial applications is Polyurethane (PU). PU is a hyper elastic and viscoelastic material formed by isocyanates with chemical reacting of polyol. In this paper several PU specimens made of 3 different shore hardness sheets are subjected to the uniaxial tensile loading to modify the Moony-Rivlin strain energy density function with a viscoelastic model. The uniaxial tensile tests are also performed for 3 different shore hardness under varying strain rates regimes (between 0.001 to 0.1). Then the numerical model based on the modified hyperviscoelastic strain density function is developed. For this purpose a user material subroutine is added to the ABAQUS finite element software. Then the analyses are performed to predict the damage evolution and tearing in the PU specimens. The effects of loading rate and shore hardness are also investigated on damage evolution of the polyurethane material under dynamic loading.
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Researchers
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Mohammad Saeed Goodarzi (Third Researcher), Mina Jahanmardi (Second Researcher), Hossein Hosseini-Toudeshky (First Researcher)
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