Evaluation of an analytical analysis method for interference fit assemblies focusing on thick-walled parts based on experimental data

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1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Publication statusPublished - 2015
Externally publishedYes
Event20th International Conference on Composite Materials, ICCM 2015 - Copenhagen, Denmark
Duration: 19 Jul 201524 Jul 2015

Conference

Conference20th International Conference on Composite Materials, ICCM 2015
CountryDenmark
CityCopenhagen
Period19.07.201524.07.2015

Keywords

  • Digital image correlation
  • Interference fit assembly
  • Thick-walled composite shaft

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