Ski development with Faction Skis: Product development and FE modelling of properties of alpine skis
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Typ
Examensarbete för kandidatexamen
Bachelor Thesis
Bachelor Thesis
Program
Maskinteknik 300 hp (civilingenjör)
Publicerad
2018
Författare
Borenius, John
Edman, Henrik
Lindmark, Albin
Pålsson, Marcus
Modellbyggare
Tidskriftstitel
ISSN
Volymtitel
Utgivare
Sammanfattning
When developing alpine skis, a lot of the work is based on previous knowledge and what has been done in the past. This report presents an approach to create an FEmodel in conjunction with Faction Skis. The model is representing an existing alpine ski; the Faction Skis Candide 3.0, the model was developed with the intention of simulating the bending stiffness as well as damping coefficients and eigenfrequencies. After future improvement, the final goal of the model is to simulate new skis before prototypes are built, for a more fact based development process than in the past. In order to obtain a reliable result, the model is compared to physical testing. A three point bending test and two different vibrations analyses were performed on a physical Candide 3.0 and compared to the FE-model. The collected data was then analyzed to determine the accuracy and predictive capabilities of the model. A slightly deviant result of ca 7.2% is obtained when comparing the physical test results of the bending stiffness to the FE model’s results. The deviant results are likely to have arisen due to non accurate material models as well as issues while establishing the thickness of each composite layer of the ski. Two tests to determine the eigenfrequencies and the damping coefficients of the ski were conducted. Both found the fundamental eigenfrequency of the ski, but due to differences in the set up they differed somewhat, at 9 Hz and 9.75 Hz respectively. Damping coefficients were also found but varied more. Due to a lack of material damping data, damping was not implemented in the model but is a possibility for the future. Even though the model does not fully correlate with the data from the physical test, it makes way for continued work. Future work is recommended to improve the accuracy and add damping capabilities to the model via more accurate material data. Adding breaking and shear strength prediction as well as delamination and progressive damage theory would also be interesting to enable the development of skis containing less conventional materials
Beskrivning
Ämne/nyckelord
Maskinteknik , Mechanical Engineering