Abstract
A proper description of ply-ply friction is essential for the simulation of thermoplastic composite forming processes. The friction response from characterization experiments typically shows a peak followed by a steady-state shear stress. The rate-dependency of the peak and steady-state shear stress can be predicted by considering shear flow and wall slip effects. In this study, we investigated the temperature- and pressure-dependency of the peak and steady-state friction. The friction decreased slightly with increasing temperature, which was predicted by the shear flow model when including the temperature-dependency of the matrix viscosity. Further, the normal pressure was found to govern the onset of wall slip. A high pressure suppresses wall slip, increasing the steady-state friction. This effect was successfully modeled by including a pressure-sensitive critical shear stress for the onset of wall slip.
Original language | English |
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Article number | 107671 |
Journal | Composites Part A: Applied Science and Manufacturing |
Volume | 173 |
Early online date | 6 Jul 2023 |
DOIs | |
Publication status | Published - Oct 2023 |