CLASSIFICATION NOTES - Indian Register of Shipping

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Page 22 of 41Calculation of Crankshafts for Internal Combustion Enginesr RDGG3.4 Outlet of crankpin oil boreThe stress concentration factor for bending ( B ) is:2 B = 3 – 5.88 . d o + 34.6 . d oThe stress concentration factor for bending ( T ) is:2 T = 4 – 6 . d o + 30 . d oIndian Register of Shipping
Classification NotesPage 23 of 41Section 4Additional Bending Stresses4.1 In addition to the alternating bending stresses in fillets (see clause 2.1.3) furtherbending stresses due to misalignment and bedplate deformation as well as due to axialand bending vibrations are to be considered by applying add as given by table:Type of engine add [N/mm 2 ]Crosshead engines 30 (*)Trunk piston engines 10(*) The additional stress of 30 [N/mm 2 ] consists of two components1) an additional stress of 20 [N/mm 2 ] resulting from axial vibration2) an additional stress of 10 [N/mm 2 ] resulting from misalignment / bedplatedeformationIt is recommended that a value of 20 [N/mm 2 ] be used for the axial vibrationcomponent for assessment purposes where axial vibration calculation results of thecomplete dynamic system (engine/shafting/gearing/propeller) are not available. Whereaxial vibration calculation results of the complete dynamic system are available, thecalculated figures may be used instead.Indian Register of Shipping
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CLASSIFICATION NOTES - Indian Register of Shipping

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