(UM)
  • Prediction of 3-D crack growth in thin-rim-gears
    Kramberger, Janez, 1963- ; Potrč, Iztok ; Flašker, Jože
    With increased demands for higher performance of gear units the load capacity of gears is a matter of great concern. In order to achieve design goals like reduced weight the rim and web of gears are ... often design thin. Rims and webs that are to thin can lead to damage problems. Crack type damage can initiate during service or can be generated even during manufacturing processes. If cracks are detected either stages the designer can evaluate the effect of crack on the overall strength of gear. Classical methods for gear design (e.g.ISO, DIN, AGMA standards) do not take into account parameters related to crack effects. The conventional standards are limited to stress calculation in tooth root and are not applicable to the analysis for thin rim gears. An exception is given in AGMA calculation standard where in conventional approach a stress modifying factor for thin rims is proposed. Not many authors have proposed certain results for effects of crack growth in thin-rim gears and this solutions were limited to 2-D analysis [Lewicki 1997], [Kramberger 2000,2001]. Performing simulation of influence of gear web arrangements on stresses requires 3-D analysis [Opalić]. The objective of this study is to evaluate the effect of different web arrangements on crack propagation path of initial cracks in thin rim gears. It is assumed that initial crack is initiated at the point, in actual fact at the line of the maximum principal stress in the tooth root. Computer program FRANC3D [Franc3D 1998] was used to determine stress distributions and model crack propagation. This program uses boundary element modelling technique and principles of linear elastic fracture mechanics to analyse of structures with cracks. The remaining service life is approximately determined with the aid of numerical integration of the Paris law.
    Vir: Proceedings of the 7th International Design Conference DESIGN 2002, Cavtat, Dubrovnik, Croatia, May 14-17, 2002 (Str. 1193-1198)
    Vrsta gradiva - prispevek na konferenci
    Leto - 2002
    Jezik - angleški
    COBISS.SI-ID - 7127318

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