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<p>Ensuring adequate fracture resistance in structural components is a critical challenge in engineering applications, as sudden crack propagation can lead to catastrophic failure. This study investigates the fracture behavior of novel rod-in-tube layered configuration using EN8 steel, aimed at enhancing fracture resistance and delaying catastrophic failure. Specimens were prepared in accordance with ASTM standards and subjected to three-point bend tests. Stress intensity factor (SIF) values were evaluated over load point displacement and time to assess crack propagation behavior. Compared to plain rod specimens, the layered configurations demonstrated a two-stage crack growth process characterized by initial steady crack propagation and subsequent delayed failure, attributed to the presence of a physical interface that arrests crack growth and redistributes stress. The configuration with an 8&#xa0;mm diameter inner rod proved as effective, extending the time to failure by approximately 115% when tested and compared with plain rod. The findings affirm the layered design’s effectiveness in enhancing both safe-life and fail-safe performance, offering a promising approach for improving fracture tolerance in structural applications.</p>

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Fracture behavior of rod-in-tube layered configurations under three-point bending: an experimental investigation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月27日

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  • Mohan Kumar,
  • Neelakantha V. Londhe,
  • C. G. Ramachandra,
  • M. Srinivas Prabhu,
  • Praveen Kumar Kanti,
  • Chander Prakash,
  • H. G. Prashantha Kumar,
  • Haiter Lenin Allasi

摘要

Ensuring adequate fracture resistance in structural components is a critical challenge in engineering applications, as sudden crack propagation can lead to catastrophic failure. This study investigates the fracture behavior of novel rod-in-tube layered configuration using EN8 steel, aimed at enhancing fracture resistance and delaying catastrophic failure. Specimens were prepared in accordance with ASTM standards and subjected to three-point bend tests. Stress intensity factor (SIF) values were evaluated over load point displacement and time to assess crack propagation behavior. Compared to plain rod specimens, the layered configurations demonstrated a two-stage crack growth process characterized by initial steady crack propagation and subsequent delayed failure, attributed to the presence of a physical interface that arrests crack growth and redistributes stress. The configuration with an 8 mm diameter inner rod proved as effective, extending the time to failure by approximately 115% when tested and compared with plain rod. The findings affirm the layered design’s effectiveness in enhancing both safe-life and fail-safe performance, offering a promising approach for improving fracture tolerance in structural applications.