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|Title:||A visco-hyperelastic constitutive description of elastomeric foam|
|Authors:||Yang, L.M. |
|Citation:||Yang, L.M., Shim, V.P.W. (2004-09). A visco-hyperelastic constitutive description of elastomeric foam. International Journal of Impact Engineering 30 (8-9) : 1099-1110. ScholarBank@NUS Repository. https://doi.org/10.1016/j.ijimpeng.2004.03.011|
|Abstract:||This study focuses on the constitutive modelling of finite deformation in elastomeric polyurethane foams - in particular, PORON-4701-59-25045-1648 (0.4g/cm3 density) and PORON-4701-59-20093-1648 (0.32g/cm3 density). Their mechanical properties under compression, for engineering strains up to about 80%, are characterized over a range of strain rates between 10-2 and 103/s. Dynamic compression is applied using a split Hopkinson pressure bar device. Experimental results show that the behaviour of elastomeric foam is sensitive to strain rate and can be described by a visco-hyperelastic material model. In this model, the quasi-static response is defined by compressible hyperelasticity, whereby the strain energy potential is assumed to be representable by a newly proposed polynomial series with three independent parameters. Strain rate sensitivity is characterized by incorporating a nonlinear Maxwell relaxation model with four parameters. The (seven) material parameters in the constitutive model are determined from high-speed mechanical testing methods tailored for high-compliance materials. A comparison of predictions based on the proposed frame-independent constitutive equation with experiments shows that the model is able to describe the rate dependent behaviour of the elastomeric foams examined. © 2004 Elsevier Ltd. All rights reserved.|
|Source Title:||International Journal of Impact Engineering|
|Appears in Collections:||Staff Publications|
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