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<p>Ken Johnson's work in several areas of railway research is explored and placed in the context of both the time that this took place and within previous and more especially subsequent developments. Ken's contributions&#xa0;on corrugation, shakedown, and rail damage&#xa0;are considered, in particular a rolling contact fatigue (RCF) defect known as a squat. Shakedown theory, which was used to propose a mechanism for initiation of squats, is&#xa0;used to demonstrate&#xa0;not only why squats were a consequence of very specific circumstances but also why they ceased to be a widespread problem in the mid-1990s. The work on shakedown undertaken by Ken and his colleagues is relevant not only to understanding modern-day rail defects but also to determining conditions that could help to avoid rail damage.</p>

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Understanding Wheel/Rail Interface Problems: The Unique Contributions and Legacy of Ken Johnson

  • 期刊论文

  • 发表日期：

    2026年4月1日

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  • Stuart L. Grassie

摘要

Ken Johnson's work in several areas of railway research is explored and placed in the context of both the time that this took place and within previous and more especially subsequent developments. Ken's contributions on corrugation, shakedown, and rail damage are considered, in particular a rolling contact fatigue (RCF) defect known as a squat. Shakedown theory, which was used to propose a mechanism for initiation of squats, is used to demonstrate not only why squats were a consequence of very specific circumstances but also why they ceased to be a widespread problem in the mid-1990s. The work on shakedown undertaken by Ken and his colleagues is relevant not only to understanding modern-day rail defects but also to determining conditions that could help to avoid rail damage.