The joint of low pressure shaft in turbofan engine is a typical non-gasketed flange connection structure, which requires the uniform preload distribution due to high performance. But in the process of tightening, because of bolt elastic interaction, the final preload distribution could be varied. The face runout of contact surface changed the properties of the elastic interaction, which proposed new requirements of non-gasketed flange research. Thus the two bolts flange FEA model was developed to focus on the effect of bolt space, tightening step and face runout on preload change rate with actual contact. The six bolts flange FEA model was developed to make a comparison between ideal contact and actual contact. The bolt elastic interaction of actual contact was proposed, which provide the final preload distribution of different tightening patterns. And then the effect of tightening start position on final preload distribution was discussed, which could provide theoretical basis for non-gasketed joint assembly.

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