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We'll analyze this bolted joint by building a non-linear finite element model in ANSYS. Our main objective is to assess the margin of safety of the flange bolts. We'd also like to determine the separation between the jointed parts. 

Loads

The pressure due to the exhaust gas in the nozzle is calculated using 1D gas dynamics. It is assumed to vary linearly along the nozzle axis. The pressure values at the top and bottom of our model are indicated in the image below. 

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The regeneration channels are omitted in the model. In exchange, a free body diagram is used to deduce the equivalent forces on the mid nozzle and lower nozzle (the upper nozzle is not modeled here).  This force pair is modeled as two separate forces. . Thermal strain due to the hot gas and the bolt pretension are included in the model.

The video above <<<link>>> discusses the calculation of model inputs. The The details of the load calculations using publicly available data are provided in this Excel file <<<include link>>><<<link>>>.

Go to Step 1: Pre-Analysis & Start-Up

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