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Delayed fracture is a problem that must be taken into account when using high-strength bolts with a tensile strength of 1.2 GPa or more. This delayed fracture occurs after a static tensile load or bending load is applied for a certain period of time at room temperature, without any apparent plastic deformation, a crack initiates from the bottom of the notch and gradually propagates, eventually resulting in an unstable fracture.

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Mechanisms and Countermeasures for Delayed Fracture

  • 章节

  • 发表日期：

    2025年

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  • Toshio Hattori,
  • Tomohiro Naruse

摘要

Delayed fracture is a problem that must be taken into account when using high-strength bolts with a tensile strength of 1.2 GPa or more. This delayed fracture occurs after a static tensile load or bending load is applied for a certain period of time at room temperature, without any apparent plastic deformation, a crack initiates from the bottom of the notch and gradually propagates, eventually resulting in an unstable fracture.