TY - CONF
T1 - Evaluation of an analytical analysis method for interference fit assemblies focusing on thick-walled parts based on experimental data
AU - Fahr, P.
AU - Hinterhölzl, R.
N1 - Funding Information:
The authors would like to thank the Bayerische Forschungsstiftung (BFS) for funding this research within the project “FORCiM3A - CFK/Metall-Mischbauweisen im Maschinen- Und Anlagenbau“. The authors would also like to express their gratitude to Voith Composites GmbH & Co. KG, SPN Schwaben Präzision Fritz Hopf GmbH and the Institute of Machine Elements of the Technische Universität München for the support manufacturing and characterising the test specimens.
Funding Information:
The authors would like to thank the Bayerische Forschungsstiftung (BFS) for funding this research within the project “FORCiM³A – CFK/Metall-Mischbauweisen im Maschinen-und Anlagenbau“. The authors would also like to express their gratitude to Voith Composites GmbH & Co. KG, SPN Schwaben Präzision Fritz Hopf GmbH and the Institute of Machine Elements of the Technische Universität München for the support manufacturing and characterising the test specimens.
Publisher Copyright:
© 2015 International Committee on Composite Materials. All rights reserved.
PY - 2015
Y1 - 2015
N2 - In industrial and automotive applications CFRP is used to reduce the weight and increase the eigenfrequencies of shafts. Interference fit assemblies (IFAs) are an appropriate joining technique for these parts. In this study the assembly process of IFAs of thick-walled CFRP shafts and steel hubs is investigated experimentally and analysed analytically. The deviations between calculations and experiments are determined. Based on this the applicability of the analytical approach for analysing thick-walled IFAs is evaluated, as analytical approaches generally enable a computationally economic analysis of IFAs. The CFRP shafts are manufactured by wet filament winding. During the assembly process the axial force is measured by a load cell and the strain of the CFRP shaft is determined via digital image correlation. The IFA is analysed with an analytical approach for finite thin-walled orthotropic parts. The measured and calculated tangential strains and assembly forces are compared with each other. The experiments confirm the direct influence of the interference and the length of the joint on the assembly force. Steel hubs with a rougher surface result in higher assembly forces. The crucial influence of the laminate layup on the contact pressure is shown experimentally and confirmed by the analytical calculations. Both the experimental investigations and the analytical calculations show, that increasing the thickness of the circumferential fibres increases the assembly force. It is also shown that this effect gets smaller the thicker the parts are. Neglecting the deformation in radial direction the assembly forces are overestimated by the analytical approach. The thicker the parts are the more pronounced this effect is, what is shown experimentally. An “efficient coefficient of friction” is defined. It is shown that the experimental determination of this value for an IFA enables the prediction of the assembly forces with the investigated analytical approach for geometrically similar IFAs.
AB - In industrial and automotive applications CFRP is used to reduce the weight and increase the eigenfrequencies of shafts. Interference fit assemblies (IFAs) are an appropriate joining technique for these parts. In this study the assembly process of IFAs of thick-walled CFRP shafts and steel hubs is investigated experimentally and analysed analytically. The deviations between calculations and experiments are determined. Based on this the applicability of the analytical approach for analysing thick-walled IFAs is evaluated, as analytical approaches generally enable a computationally economic analysis of IFAs. The CFRP shafts are manufactured by wet filament winding. During the assembly process the axial force is measured by a load cell and the strain of the CFRP shaft is determined via digital image correlation. The IFA is analysed with an analytical approach for finite thin-walled orthotropic parts. The measured and calculated tangential strains and assembly forces are compared with each other. The experiments confirm the direct influence of the interference and the length of the joint on the assembly force. Steel hubs with a rougher surface result in higher assembly forces. The crucial influence of the laminate layup on the contact pressure is shown experimentally and confirmed by the analytical calculations. Both the experimental investigations and the analytical calculations show, that increasing the thickness of the circumferential fibres increases the assembly force. It is also shown that this effect gets smaller the thicker the parts are. Neglecting the deformation in radial direction the assembly forces are overestimated by the analytical approach. The thicker the parts are the more pronounced this effect is, what is shown experimentally. An “efficient coefficient of friction” is defined. It is shown that the experimental determination of this value for an IFA enables the prediction of the assembly forces with the investigated analytical approach for geometrically similar IFAs.
KW - Digital image correlation
KW - Interference fit assembly
KW - Thick-walled composite shaft
UR - http://www.scopus.com/inward/record.url?scp=85018570755&partnerID=8YFLogxK
M3 - Paper
AN - SCOPUS:85018570755
T2 - 20th International Conference on Composite Materials, ICCM 2015
Y2 - 19 July 2015 through 24 July 2015
ER -