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<p>This study addresses the limitations of traditional prestressed anchor cables—specifically brittle fracture, inadequate energy dissipation and suboptimal shear performance under combined tension-shear loading—by introducing cables exhibiting a negative Poisson’s ratio effect. The mechanical optimisation mechanism was systematically investigated through integrated experimental and numerical methodologies. Static tension testing, shear testing and infrared thermographic analysis were conducted on 6-mm diameter negative Poisson’s ratio cables alongside comparable Grade 1370 steel strands. Negative Poisson’s ratio cables demonstrated tensile fracture elongations of 29.1–30.7%, representing a 250% improvement over conventional counterparts, whilst exhibiting neither necking phenomena nor significant reduction in ultimate strength (approximately 10% slower degradation). Shear strains reached 12.4–14.3%, with failure progressing through sequential wire fracture rather than catastrophic brittle failure. Infrared thermography revealed uniform thermal distributions in negative Poisson’s ratio cables (gradients &lt; 5&#xa0;°C), contrasting with conventional cables exhibiting gradients &gt; 10&#xa0;°C, thereby demonstrating superior energy dissipation capacity. Finite element modelling using ABAQUS software validated that negative Poisson’s ratio characteristics mitigate localised stress concentrations through optimised load distribution. Simulations further indicated pre-tensioning to 45% of ultimate strength yields optimal comprehensive load-bearing performance. These findings establish foundations for lightweight support systems in complex stress environments, advancing negative Poisson’s ratio material applications in geotechnical engineering.</p>

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Tensile-Shear Performance of Small-Diameter NPR Cable Bolts: Experimental and Numerical Study

  • 期刊论文

  • 发表日期：

    2025年10月31日

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  • Lei Xiaotian,
  • Tao Zhigang,
  • Yu Haijun,
  • Liu Keyuan,
  • Jin Hao

摘要

This study addresses the limitations of traditional prestressed anchor cables—specifically brittle fracture, inadequate energy dissipation and suboptimal shear performance under combined tension-shear loading—by introducing cables exhibiting a negative Poisson’s ratio effect. The mechanical optimisation mechanism was systematically investigated through integrated experimental and numerical methodologies. Static tension testing, shear testing and infrared thermographic analysis were conducted on 6-mm diameter negative Poisson’s ratio cables alongside comparable Grade 1370 steel strands. Negative Poisson’s ratio cables demonstrated tensile fracture elongations of 29.1–30.7%, representing a 250% improvement over conventional counterparts, whilst exhibiting neither necking phenomena nor significant reduction in ultimate strength (approximately 10% slower degradation). Shear strains reached 12.4–14.3%, with failure progressing through sequential wire fracture rather than catastrophic brittle failure. Infrared thermography revealed uniform thermal distributions in negative Poisson’s ratio cables (gradients < 5 °C), contrasting with conventional cables exhibiting gradients > 10 °C, thereby demonstrating superior energy dissipation capacity. Finite element modelling using ABAQUS software validated that negative Poisson’s ratio characteristics mitigate localised stress concentrations through optimised load distribution. Simulations further indicated pre-tensioning to 45% of ultimate strength yields optimal comprehensive load-bearing performance. These findings establish foundations for lightweight support systems in complex stress environments, advancing negative Poisson’s ratio material applications in geotechnical engineering.