TEMPERATURE ====================================================================== Reference Temperature T0 øC 20 ---------------------------------------------------------------------- Working Temperature T øC 300 ---------------------------------------------------------------------- Difference Length screw delta LS mm 0.515 ---------------------------------------------------------------------- modulus of elasticity screw ES N/mm² 206000 ---------------------------------------------------------------------- modulus of elasticity screw 300 ES300 N/mm² 185000 ---------------------------------------------------------------------- CLAMPING COMPONENTS (T = 300øC) ====================================================================== i l20 [mm] l300 mm E N/mm² E 300 d20 mm/N d300 mm/N ====================================================================== 1 60.000 60.193 210000 185000 0.218E-6 0.247E-6 ---------------------------------------------------------------------- 2 50.000 50.364 44000 23008 0.601E-6 1.150E-6 ---------------------------------------------------------------------- 3 50.000 50.126 125000 104462 0.212E-6 0.253E-6 ---------------------------------------------------------------------- Difference Length clamping pieces delta LP mm 0.683 ---------------------------------------------------------------------- Elasticity screw delta St mm/N 2.464E-6 ---------------------------------------------------------------------- Elasticity plates delta Pt mm/N 1.65E-6 ---------------------------------------------------------------------- yield point screw Re N/mm² 940 ---------------------------------------------------------------------- yield point screw 300øC Re300 N/mm² 705 ---------------------------------------------------------------------- Dec./inc.clamping force Work.temp.delta FM N -40831 ---------------------------------------------------------------------- assembly prestress. force 300øC FM 300 N 290196 ----------------------------------------------------------------------For differing elasticity modulus of screw and clamping plate, a higher or lower surrounding temperature causes an increase or decrease of the clamping force. Also, with high temperatures, the yield point and the E modulus decrease. SR1 calculates the temperature dependent values, these are then printed out on an additional page. The least favourable values of room and working temperatures are used in the safety margin calculation.

--------------------------------------------------------------------- Shearing modulus G N/mm² 82692 82692 --------------------------------------------------------------------- Shearing stress, shaft tau I N/mm² 24.5 --------------------------------------------------------------------- Shearing stress for slipping tau R N/mm² 4.9 --------------------------------------------------------------------- Transfer.torque for slipping T R Nm 795.7 --------------------------------------------------------------------- Rotation, hub phiA ° -0.0011 --------------------------------------------------------------------- Rotation, shaft phiI ° 0.0284 --------------------------------------------------------------------- Torque limit, drift Tgrenz Nm 137.7 --------------------------------------------------------------------- Safety again. micro slipping Tgr./T 0.229 --------------------------------------------------------------------- Stress concentr.coeff. alpha kt 1.061 ---------------------------------------------------------------------For large alternating torques micro sliding can occur in the seam surface due to differing rotations of the shaft and hub. This causes fitting corrosion, which drastically reduces the life expectancy of the pressed fit. The calculation is documented in the German book "Shaft/Hub Joints" by Kollmann (Publisher: Springer). The following measures are recommended for driftless transfer:

F = m * omega² * r with omega = 2*PI*n with F: dynamic radial force m: mass in Kg omega: rotation frequency n: shaft rotational speed 1/s r: deflection at the mass center of gravity.After recalculation, the increased deflection due to unbalance can be used for the calculation of F dyn, until balance is attained.