CLASSIFICATION NOTES - Indian Register of Shipping

Page 40 of 41Calculation of Crankshafts for Internal Combustion EnginesFig. 3.4 : Load applications for in-line and V-type enginesThe maximum equivalent von Mises stress 3Pin the journal fillet is evaluated. The SCFin the journal fillet can be determined in two ways as shown below.3.3.1 Method 1This method is analogous to the FVV investigation. The results from 3-point and 4-pointbending are combined as follows: . 3P N3P. BQ3PQwhere:3Pas found by the FE calculation.N 3PNominal bending stress in the web centre due to the force F 3 P[N] applied to thecentre-line of the actual connecting rod, see figure 3.4.Bas determined in paragraph 3.2.Q3P= Q3 P/( B.W)where Q 3 Pis the radial (shear) force in the web due to the force F 3 P[N] applied to the centre-line of the actual connecting rod, see also figures 3 and 4 inGeneral method given in Section 1 to 8 and Appendix I and II .3.3.2 Method 2This method is not analogous to the FVV investigation. In a statically determined systemwith one crank throw supported by two bearings, the bending moment and radial (shear)force are proportional. Therefore the journal fillet SCF can be found directly by the 3-point bending FE calculation.Indian Register of Shipping