期刊
MATERIALS LETTERS
卷 63, 期 11, 页码 877-880出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.matlet.2009.01.055
关键词
Hyper-viscoelasticity; Constitutive modeling; Polyurea; Rate-dependent material; High strain rate
资金
- Office of Naval Research [N00014-08-C-0614]
This letter presents a new constitutive model for polyurea by superposing the hyperelastic and viscoelastic behaviors of polyurea. The Ogden model is used for the hyperelastic part and its parameters are determined from curve fitting of quasi-static test data. A nonlinear viscoelastic model is employed for describing the viscoelastic behavior and its relaxation time is obtained based on the test data of shear relaxation modulus. A special form of Zapas kernel for the damping function is found to be very effective to capture the viscoelastic behavior of polyurea subjected to wide ranges of strain rate. Both the versatility and accuracy of the model are examined via virtual testing. (C) 2009 Elsevier B.V. All rights reserved.
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