期刊
POLYMERS
卷 8, 期 4, 页码 -出版社
MDPI
DOI: 10.3390/polym8040133
关键词
Ogden; K-BKZ; compression; hyperelastic; viscoelastic; polyurea
资金
- State Key Laboratory of Explosion Science and Technology Funding [ZDKT13-01, KFJJ13-1Z]
- Natural Science Foundation of China [11102023, 11172071]
A hyper-viscoelastic constitutive model for polyurea by separating hyperelastic and viscoelastic behaviors has been put forward. Hyperelasticity represents the rate-independent responses at low strain rates, described by a three-parameter Mooney-Rivlin model and a third Ogden model. By fitting the quasi-static experimental data, the Ogden model is more appropriate to describe the hyperelastic behaviors for its better agreement at strain over 0.3. Meanwhile, viscoelasticity represents the rate-dependent responses at high strain rates, described by the Standard Linear Solids (SLS) model and the K-BKZ model. By fitting the experimental data of split Hopkinson pressure bar (SHPB), the SLS model is more appropriate to describe the viscoelastic behaviors at strain rates below 1600 s(-1), but the K-BKZ model performs better at strain rates over 2100 s(-1) because of the substantial increase of Young's modulus and the state of polyurea transforming from rubbery to glassy. The K-BKZ model is chosen to describe the viscoelastic behavior, for its low Root Mean Square Error (RMSE) at strain rates below 1600 s(-1). From the discussion above, the hyper-viscoelastic constitutive model is chosen to be the combination of the Ogden model and the K-BKZ model.
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