A three-dimensional study of frictional contact in a helical splined coupling for the assessment of macroscopic fretting variables is presented. The study is based on an experimentally validated finite element model of the coupling under combined torque and axial loads. The effect of axial profile modification for reduced contact stresses in spline teeth and the effect of friction coefficient are considered. The motivation for the work is the need for representative information about fretting variable distributions in splined couplings for the development and application of simplified fretting test configurations.
Curvic couplings transmit torque between parallel in-line shafts or turbine/compressor discs. They are used extensively within the aero-engine industry but can also be found in industrial gas turbines. The manufacture of Curvic couplings involves the precision cutting and grinding of mating teeth on the adjacent ends of the components; the assembly is then clamped together with bolts. The use of Curvic couplings in engineering transmission components is relatively widespread, although the publication of work in the open literature is currently limited.An attempt has been made to investigate the factors in¯uencing the load imparted to a fan Curvic coupling in a large aerospace gas turbine. Owing to the very complicated nature of the current problem, some geometric and especially loading simpli®cations have been necessary. The results presented provide an initial solution to the problem of the three-dimensional numerical modelling of a fan Curvic coupling during a blade release event. This work is intended to provide data to help make decisions at the design stage and, together with aero-engine fan blade-o tests, will contribute to an improved design of Curvic couplings. The current work has been carried out using the threedimensional ®nite element elastic±plastic contact method in an attempt to achieve realistic displacements of the fan Curvic teeth and bolts.
Curvic couplings transmit torque between parallel in-line shafts or turbine/compressor discs. They are used extensively within the aero-engine industry but can also be found in industria l gas turbines. The manufacture of Curvic couplings involves the precision cutting and grinding of mating teeth on the adjacent ends of the components; the assembly is then clamped together with bolts.The design objectives for aerospace transmissions, and hence the Curvic coupling, are to reduce manufacturing cost, weight and size. The experimental testing of Curvic couplings within an aeroengine environment is time consuming and expensive. The objective of this paper is to justify con®dence in the results from three-dimensional ®nite element (F E) contact analyses when investigating Curvic couplings. The accuracy of the F E analyses requires a ®ne mesh in the contact region and the capability to deal with stick-slip behaviour in multiple three-dimensional contact surfaces. A comparison of the results from a photoelastic test with the results from an F E analysis provides a validation of the F E contact method for use with Curvic couplings. The results presented in this paper indicate that the photoelastic results agree reasonably well with results of the F E method analyses.
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