| DAN Min， XIONG Han-tao， JIN Yu-yang， YANG Cheng-hao.Numerical and Experimental Investigation of Axial Stress Distribution in Multi-layer Connection Structures[J].航空发动机,2024,50(3):107-113 |
| Numerical and Experimental Investigation of Axial Stress Distribution in Multi-layer Connection Structures |
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| Key Words:aeroengine multi-layer connection structure axial stress distribution distribution model |
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| Abstract:To analysis the axial stress distribution of multi-layer connection structures，starting from the axial load distribution of
double flange bolt connection structures，a hollow ellipsoid distribution model of axial stress distribution of connected parts was proposed，
and the theoretical expression of axial member stiffness of connected parts was derived. Experimental investigations of the torque-preload
relationship and pressure distribution were carried out. The proposed model was applied to multi-layer flange connection structures of an
aeroengine， and the hollow ellipsoid model was numerically and experimentally verified. The results show that the preload is positively cor?
related with the torque，and the tightening coefficient is about 0.2， which is consistent with the empirical value of bolt tightening torque
coefficient under no lubrication condition in engineering. With the increase of torque，the contact range of the connection interface
increases to a certain extent and then remains unchanged. Compared with the experimental results of axial stress distribution of the con?
nected parts， the maximum error of the calculation results using the improved hollow ellipsoid model and the original hollow cone model
are 9.42% and 21.97%， respectively， proving the improved hollow ellipsoid distribution model has higher accuracy. |
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