CLASSIFICATION NOTES - Indian Register of Shipping

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Page 20 of 41Calculation of Crankshafts for Internal Combustion EnginesIf calculated f (recess) < 1 then the factor f (recess) is not to be considered(f (recess)=1)If s < -0.5 then f (s,w) and f(r,s) are to be evaluated replacing actual valueof s by –0.5.3.2 Crankpin filletThe stress concentration factor for bending ( B ) is:( B = 2.6914 . f (s,w) . f(w) . f(b) . f(r) . f(d G ) . f(d H ) . f (recess)where,f (s,w) = -4.1883 + 29.2004 . w – 77.5925 . w 2 + 91.9454 . w 3 – 40.0416 .w 4 +(1-s) . (9.5440 – 58.3480 / w + 159.3415 . w 2 – 192.5846 . w 3 + 85.2916 /w 4 ) + (1-s) 2 . (-3.8399 + 25.0444 . w – 70.5571 . w 2 + 87.0328 . w 3 –39.1832 . w 4 )f (w) = 2.1790 . w 0.7171f (b) = 0.6840 – 0.0077 . b + 0.1473 . b 2f (r) = 0.2081 . r (-0.5231)f (d G ) = 0.9993 + 0.27 . d G – 1.0211 . d 2 3G + 0.5306 . d Gf (d H ) = 0.9978 + 0.3145 . d H – 1.5241 . d 2 3H + 2.4147 . d Hf (recess) = 1 + (t H + t G ) . (1.8 + 3.2 . s)The stress concentration factor for torsion ( ) is:where, = 0.8 . f (r,s) . f(b) . f(w)f (r,s) =(-0.322 + 0.1015 . 1-a))rf (b) = 7.8955 – 10.654 > b + 5.3482 . b 2 – 0.857 . b 3f (w) = w (-0.145)3.3 Journal fillet (not applicable to semi-built crankshaft)The stress concentration factor for bending ( B ) is: B = 2.7146 . f B (s,w) . f B (w) f B (w) . f B (b) . f B (r) . f B (d G ) . f B (d H ) . f (recess)where,Indian Register of Shipping
Classification NotesPage 21 of 41f B (s,w)= -1.7625 + 2.9821 . w – 1.5276 . w 2 + (1-s) . (5.1169 – 5.8089 . w + 3.1391. w 2 + (1-s) 2 . (-2.1567 + 2.3297 . w – 1.2952 . w 2 )f B (w) = 2.2422 . w 0.7548f B (b) = 0.5616 + 0.1197 . b + 0.1176 . b 2f (r) = 0.1908 . r (-0.5568)f B (d G ) =21.0012 - 0.6441 . d G + 1.2265 . d Gf B (d H ) =21.0022 - 0.1903. d H + 0.0073 . d Hf (recess) = 1 + (t H + t G ) . (1.8 + 3.2 . s)The stress concentration factor for compression ( Q ) due to the radial force is: Q = 3.0128 . f Q (s) . f Q (w) . f Q (b) . f Q (r) . f Q (d H ) . f (recess)where,f Q (s) = 0.4368 + 2.1630 . (1-s) - 1.5212 . (1-s) 2f Q (w) =f Q (b) =w0.0637 0.9369.w-0.5 + bf Q (r) = 0.5331 . r (-0.2038)f Q (d H ) =20.9937 - 1.1949 . d H + 1.7373 . d Hf (recess) = 1 + (t H + t G ) . (1.8 + 3.2 . s)The stress concentration factor for torsion ( T ) is, T = if the diameters and fillet radii of crankpin and journal are same.If crankpin and journal diameters and/or radii are of different sizes, then T = 0.8 . f (r,s) . f(b) . f(w)where,f (r,s), f(b) and f(w) are to be determined in accordance with clause 3.2 (see calculation ofT), however, the radius of the journal fillet is to be related to the journal diameter:Indian Register of Shipping
Page 8 and 9: Page 8 of 41Calculation of Cranksha
Page 11 and 12: Classification NotesPage 11 of 41X
Page 14 and 15: Page 14 of 412.2.2 Calculation of n
Page 16 and 17: Page 16 of 41Calculation of Cranksh
Page 35 and 36: Classification NotesPage 35 of 41pa
Page 37 and 38: Classification NotesPage 37 of 41 1

CLASSIFICATION NOTES - Indian Register of Shipping

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