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<p>In this study, a novel time-varying nonlinear dynamic analysis method is proposed for investigating preload degradation in bolted joint interfaces. A refined finite element analysis (FEA) is employed to characterize preload degradation patterns in bolted joints under cyclic loading. Factors affecting the clamping performance of the interface are incorporated into a nonlinear joint model, thereby enabling the development of a time-varying Iwan model for long-term vibration analysis. Considering the fast variation in vibration response and the slow evolution of preload degradation, a hierarchical evolutionary fast-slow decomposition method is developed for dynamic analysis. A nonlinear iterative algorithm is used to capture the coupled behavior between the structural dynamic response and preload degradation under long-term vibration. The proposed model and analysis method are validated experimentally using a bolted joint friction oscillator. The numerical predictions agree well with experimental results, with a maximum error below <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(13\%\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>13</mn> <mo>%</mo> </mrow> </math></EquationSource> </InlineEquation>. The study also quantifies the evolution of normal preload degradation and tangential hysteresis with loading cycles.</p>

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A time-varying nonlinear dynamic analysis for preload degradation of bolted joint interfaces

  • 期刊论文

  • 发表日期：

    2025年12月5日

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  • Di Yuan,
  • Qiang Wan,
  • Yihan Du,
  • Yongbu Jin,
  • Dong Wang

摘要

In this study, a novel time-varying nonlinear dynamic analysis method is proposed for investigating preload degradation in bolted joint interfaces. A refined finite element analysis (FEA) is employed to characterize preload degradation patterns in bolted joints under cyclic loading. Factors affecting the clamping performance of the interface are incorporated into a nonlinear joint model, thereby enabling the development of a time-varying Iwan model for long-term vibration analysis. Considering the fast variation in vibration response and the slow evolution of preload degradation, a hierarchical evolutionary fast-slow decomposition method is developed for dynamic analysis. A nonlinear iterative algorithm is used to capture the coupled behavior between the structural dynamic response and preload degradation under long-term vibration. The proposed model and analysis method are validated experimentally using a bolted joint friction oscillator. The numerical predictions agree well with experimental results, with a maximum error below \(13\%\) 13 % . The study also quantifies the evolution of normal preload degradation and tangential hysteresis with loading cycles.