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August 28, 2026Journal of Tribology

Bolt preload detection method based on connection interface porosity

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Authors

WZWanglong ZhangHZHaiyang ZhangXJXiaodong Jia

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Overview

Modeling study demonstrates accurate bolt preload measurement in bolted connection structures via interface porosity, suggesting enhanced health monitoring under complex service conditions.

Key Points

  • To develop a bolt preload measurement model and contact state characterization method based on connection interface porosity and contact mechanics.
  • Formulated a contact mechanics-based analytical model linking interface porosity directly to real contact area and interface contact pressure.
  • Characterized the connection interface contact state to infer bolt preload changes instead of evaluating bolt body deformation parameters.
  • Achieved a bolt preload measurement error of less than 10% using the interface porosity model.
  • Quantified the relationship between interface porosity, true contact area, and local contact pressure distribution across the connection interface.

Cite This Study

Zhang et al. (2026) studied this question.

synapsesocial.com/papers/6a916ea0d15324a1df3aa742https://doi.org/10.1115/1.4072642
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