The tail drum is a critical system component and is to be made from AlSI4340 ste

Question

The tail drum is a critical system component and is to be made from AlSI4340 steel. Figure 2 shows the general arrangement of the drum in its working environment, and Figure 3 gives the detailed shaft geometry The bearing block supports are fixed to the support structure with two bolts each also made from AISI4340 steel. The diameter of the bolts is 15 mm with a core diameter of 12 mm in the threaded section, The bolts are pre tensioned to a stress of 60% of the yield stress of the steel to ensure the nut does not come loose during operation 0 Figure 2. Tail drum in its working environment 1400 dimensions in [mm] not to scale 440 30 080 bearing centre line shoulder radius r = 5 mm

Explanation / Answer

Heat treatment of the AISI430 steel =   5000 * 200 * 0.00025/0.325

                                                         = 769.23 K

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