University of Twente Student Theses
Flow characterization by indentation methods of unidirectional thermoplastic composites
Koopman, T.H. (2025) Flow characterization by indentation methods of unidirectional thermoplastic composites.
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| Abstract: | Experimental research was conducted to develop a new method to characterize the transverse flow behavior of unidirectional (UD) thermoplastic composites. In this research, the materials LMPAEK and carbon fiber LMPAEK composite (C/LMPAEK) were brought to above melting temperature in a rheometer and were subjected to indentation tests at different constant indentation velocities. The LMPAEK material was indented with an axisymmetric spherical indenter and the measured normal forces over indentation depth were compared to conventional viscosity test methods, a closed form solution, and finite element method simulations. The C/LMPAEK material was indented with a cylindrical indenter in the fiber direction to isolate the transverse flow behavior from the longitudinal flow behavior. A plane strain Kelvin model simulation was fitted to the measured indentation force over indentation depth to see if it was possible to characterize the flow behavior of the transverse viscosity of C/LMPAEK in melt. It was found that the LMPAEK indentation tests could not accurately describe material behavior, due to rheometer not being as accurate in its measurements as needed. The C/LMPAEK indentation tests showed rate dependent behavior and together with the simulations flow behavior was described. |
| Item Type: | Essay (Master) |
| Faculty: | ET: Engineering Technology |
| Subject: | 51 materials science, 52 mechanical engineering |
| Programme: | Mechanical Engineering MSc (60439) |
| Link to this item: | https://purl.utwente.nl/essays/106202 |
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