Abstract
In the current work, the tensile properties of semi-crystalline Polyamide 6 are experimentally investigated for varying degrees of crystallinity, temperatures, and loading rates. Based on the experimental results, a phenomenological constitutive framework at finite strains is derived in a thermodynamically consistent manner. To this end, a hyperelastic-plastic intermolecular resistance and viscous molecular network resistance are considered. Non-linear kinematic and isotropic hardening as well as nonlinear relaxation behavior are incorporated, to account for the experimentally observed behavior. It is evident that the mechanical behavior of semi-crystalline polymers exhibits complex dependencies on the degree of crystallinity and the temperature. To capture these experimental findings, both quantities serve as input parameters. A staggered parameter identification scheme is proposed to obtain a unique set of material parameters. Finally, the great capabilities of the proposed framework, to accurately predict the three-dimensional, visco-hyperelastic-plastic material response are demonstrated
Original language | English |
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Pages (from-to) | 22-30 |
Number of pages | 9 |
Journal | Technische Mechanik |
Volume | 40 |
Issue number | 1 |
DOIs | |
Publication status | Published - 2020 |
Event | 6th International Conference on Material Modeling, ICMM 2019 - Lund University, Lund, Sweden Duration: 26 Jun 2019 → 28 Jun 2019 Conference number: 6 http://www.icmm6.lth.se/ |
Keywords
- Degree of crystallinity
- Finite strains
- Hyperelastic-visco-plasticity
- Semi-crystalline polymers