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<p>The aero-engine casing, a critical component of an aero-engine, relies on properly secured bolted joints to ensure bolt preload, which minimizes the risk of bolt loosening and enhances the joint’s restraining strength. This paper aims to develop a predictive model for the residual preload in bolted flange connections without gaskets, considering elastic interactions within bolt groups. After careful analysis, the study establishes a mathematical model for single- and multi-step preload processes in the casing connection system. The accuracy of the model is verified through both finite element simulations and experimental validation. The analysis explores the impact of different preload sequences and variable loading patterns on the residual preload distribution across the bolt group. Results indicate that optimized preload sequences and controlled variable loading significantly reduce the effects of elastic interactions, leading to a more uniform distribution of residual preload. In addition, the study also investigated the effects of materials, number of bolts, thickness of connections, end face friction coefficients, and boundary conditions on residual preload behavior. The proposed model provides a valuable reference for optimizing bolted joint assembly processes and predicting connection performance in rotor systems of aero-engines.</p>

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The preload prediction model of single- and multi-step preload of the casing connection system is obtained by using the elastic interaction theory of bolt group

  • 期刊论文

  • 发表日期：

    2025年2月4日

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  • Wujiu Pan,
  • Hengyang Xu,
  • Junyi Wang,
  • Jianwen Bao,
  • Peng Gao,
  • Xianjun Zeng,
  • Peng Nie

摘要

The aero-engine casing, a critical component of an aero-engine, relies on properly secured bolted joints to ensure bolt preload, which minimizes the risk of bolt loosening and enhances the joint’s restraining strength. This paper aims to develop a predictive model for the residual preload in bolted flange connections without gaskets, considering elastic interactions within bolt groups. After careful analysis, the study establishes a mathematical model for single- and multi-step preload processes in the casing connection system. The accuracy of the model is verified through both finite element simulations and experimental validation. The analysis explores the impact of different preload sequences and variable loading patterns on the residual preload distribution across the bolt group. Results indicate that optimized preload sequences and controlled variable loading significantly reduce the effects of elastic interactions, leading to a more uniform distribution of residual preload. In addition, the study also investigated the effects of materials, number of bolts, thickness of connections, end face friction coefficients, and boundary conditions on residual preload behavior. The proposed model provides a valuable reference for optimizing bolted joint assembly processes and predicting connection performance in rotor systems of aero-engines.