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<p>Aluminum/polytetrafluoroethylene (Al/PTFE) reactive composites are widely used in engineering applications where reliable mechanical characterization under quasi-static loading is required. However, standardized specimen geometries for compression testing of these materials have not yet been established, which may lead to inconsistent and non-comparable experimental results. In this study, a systematic experimental and numerical investigation was conducted to evaluate the influence of specimen geometry on the quasi-static compressive behavior of Al/PTFE reactive composites. Cylindrical specimens with identical diameters and different heights were tested under uniaxial compression, and the resulting stress–strain responses and deformation modes were analyzed. The results show that the measured compressive response exhibits a strong dependence on the specimen height-to-diameter (H/D) ratio. This dependence should be interpreted as a geometry-dependent constrained compression response rather than an intrinsic H/D-dependent change in material constitutive strength. In specimens with low H/D ratios, the increase in apparent peak axial stress is mainly caused by end-face friction, geometric confinement, and the resulting multiaxial stress state. In contrast, specimens with high H/D ratios are prone to axial tilting and premature instability. Therefore, the D10H10 specimen is recommended as a practical compromise geometry for quasi-static compression testing under the present lubrication and loading conditions, rather than as a unique geometry that completely eliminates boundary effects.</p>

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Specimen H-D Ratio and End-Face Constraint Effect on Apparent Quasi-static Compressive Response

  • 期刊论文

  • 发表日期：

    2026年8月3日

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  • Xinxin Ren,
  • Jinchun Liu,
  • Yuchun Li,
  • Jiaxiang Wu,
  • Junyi Huang,
  • Yan Tu,
  • Zhengwei Meng

摘要

Aluminum/polytetrafluoroethylene (Al/PTFE) reactive composites are widely used in engineering applications where reliable mechanical characterization under quasi-static loading is required. However, standardized specimen geometries for compression testing of these materials have not yet been established, which may lead to inconsistent and non-comparable experimental results. In this study, a systematic experimental and numerical investigation was conducted to evaluate the influence of specimen geometry on the quasi-static compressive behavior of Al/PTFE reactive composites. Cylindrical specimens with identical diameters and different heights were tested under uniaxial compression, and the resulting stress–strain responses and deformation modes were analyzed. The results show that the measured compressive response exhibits a strong dependence on the specimen height-to-diameter (H/D) ratio. This dependence should be interpreted as a geometry-dependent constrained compression response rather than an intrinsic H/D-dependent change in material constitutive strength. In specimens with low H/D ratios, the increase in apparent peak axial stress is mainly caused by end-face friction, geometric confinement, and the resulting multiaxial stress state. In contrast, specimens with high H/D ratios are prone to axial tilting and premature instability. Therefore, the D10H10 specimen is recommended as a practical compromise geometry for quasi-static compression testing under the present lubrication and loading conditions, rather than as a unique geometry that completely eliminates boundary effects.