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<p>Knurled interference fits (KIFs) are force- and form-locking shaft-hub connections whose torque transmission capacity results from the contact surface generated during joining of a&#xa0;knurled component and the softer, oversized counter body. In inner-knurled interference fits (IKIFs), the profile of the oversized shaft is formed by the knurled hub. Despite the high power density and compact design of the joint, there are currently no reliable, universally applicable design criteria for ensuring structural integrity, which limits their industrial application. This article therefore investigates the structural integrity of IKIFs under cyclic torsional loading in order to establish a&#xa0;correlation between the shape of the joint, the type of failure and the location of failure. Considering the residual stress states and the forming history in the calibrated finite element model, the suitability of a&#xa0;local verification at the expected location of damage is validated.</p>

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Structural integrity of inner-knurled interference fits under cyclic torsion

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月14日

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  • Tobias Hentschel,
  • Alexander Hasse

摘要

Knurled interference fits (KIFs) are force- and form-locking shaft-hub connections whose torque transmission capacity results from the contact surface generated during joining of a knurled component and the softer, oversized counter body. In inner-knurled interference fits (IKIFs), the profile of the oversized shaft is formed by the knurled hub. Despite the high power density and compact design of the joint, there are currently no reliable, universally applicable design criteria for ensuring structural integrity, which limits their industrial application. This article therefore investigates the structural integrity of IKIFs under cyclic torsional loading in order to establish a correlation between the shape of the joint, the type of failure and the location of failure. Considering the residual stress states and the forming history in the calibrated finite element model, the suitability of a local verification at the expected location of damage is validated.