| AI Yan-ting 1 ， TIAN Shun-mi 1 ， LIU Yu 1 ， TIAN Jing 1 ， FU Peng-zhe 2 ， LIU Shi-yun 2.Numerical Simulation and Experimental Verification of Flange Joint Bolt Preload Uniformity UnderClockwise-counterclockwise Circular Tightening Sequence[J].航空发动机,2024,50(2):77-82 |
| Numerical Simulation and Experimental Verification of Flange Joint Bolt Preload Uniformity UnderClockwise-counterclockwise Circular Tightening Sequence |
| DOI： |
| Key Words:bolted flange joint elastic interaction preload dispersion loading scheme aeroengine |
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| Abstract:In the assembly process of aeroengine casing flange joints, elastic interaction occurs between bolts at different positions,
and different tightening sequence cause bolt preload dispersion to a certain extent after assembly. To solve this problem, a 3D contact finite
element model of the 3-layer casing flange joint with a spigot was established, and the methods of applying the bolt preload under different
loading schemes were studied. Based on the finite element model, the bolt preload dispersion of the clockwise tightening sequence, the
cross tightening sequence, and the two-pass clockwise-counterclockwise circular tightening sequence for the 3-layer flange joint were
simulated numerically. The corresponding test equipment was set up to verify the preload dispersion of the three loading schemes. The
results show that the bolt preload uniformity is the best when adopting the two-pass clockwise-counterclockwise circular tightening
sequence, and the bolt preload dispersion is relatively small. The bolt preload dispersion results from the finite element simulation and the
test are 2.43% and 4.98% respectively. After adopting this loading scheme, a better sealing effect and stiffness symmetry can be achieved
for the flange joint with a spigot. |
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