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<p>Interference fitting is proved effective in strengthening the fatigue life of mechanical joints. Press fitting tests and numerical simulations were conducted to study mechanical effects of interference fitted pinned specimens with an extremely small edge margin in this paper. The pin insertion resistance and protuberance profile predicted by finite element (FE) model agreed well with measurements. Results showed that both in-plane and out-of-plane deformations of the interference fit plate were altered and likely exhibited an unignorable influence on the load path and direction. Obvious grain bending and grain lengthening occurred at the smallest cross section near the hole surface. Moreover, the size effect of small margin significantly changed the distribution of the residual stress and residual strain around the hole. The alteration of the residual stress field can have a more profound impact on the fatigue life enhancement of interference fitting, furthermore, the larger the interference size the more obvious effects.</p>

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Mechanical effects of interference fitting on joints with small edge distance and large pin diameter

  • 期刊论文

  • 发表日期：

    2025年9月4日

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  • Qiliang Zhang,
  • Yangjie Zuo,
  • Qiong Wu,
  • Zongwei Hu

摘要

Interference fitting is proved effective in strengthening the fatigue life of mechanical joints. Press fitting tests and numerical simulations were conducted to study mechanical effects of interference fitted pinned specimens with an extremely small edge margin in this paper. The pin insertion resistance and protuberance profile predicted by finite element (FE) model agreed well with measurements. Results showed that both in-plane and out-of-plane deformations of the interference fit plate were altered and likely exhibited an unignorable influence on the load path and direction. Obvious grain bending and grain lengthening occurred at the smallest cross section near the hole surface. Moreover, the size effect of small margin significantly changed the distribution of the residual stress and residual strain around the hole. The alteration of the residual stress field can have a more profound impact on the fatigue life enhancement of interference fitting, furthermore, the larger the interference size the more obvious effects.