Scholarlink

<p>To investigate the dynamic mechanical behavior and energy evolution of coral reef limestone (CRL) under cyclic impact loading, a modified split Hopkinson pressure bar (SHPB) apparatus was employed to conduct tests on saturated CRL specimens at five confining pressures (0, 2, 4, 6, and 8 MPa). The results indicate that the dynamic stress–strain response of CRL can be divided into four stages. As the number of impact cycles increases, the compaction stage progressively lengthens, and the number of impact cycles sustained before failure increases with confining pressure. Increasing confining pressure enhances both the peak stress and the dynamic elastic modulus, while the peak strain and strain rate decrease correspondingly. The dynamic compressive strength of CRL exhibits strong strain rate sensitivity, which can be accurately described by a linear relationship. Both confining pressure and the number of impact cycles influence the energy distribution within CRL. Increasing confining pressure reduces the energy dissipation density and decreases the rate at which it increases with impact cycles. Furthermore, confining pressure decreases the damage variable of CRL specimens, thereby inhibiting damage accumulation.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Dynamic Mechanical Properties and Energy Evolution of Coral Reef Limestone Under Cyclic Impact Loading with Various Confining Pressures

  • 期刊论文

  • 发表日期：

    2026年6月16日

查看全文
  • Jinhe Gao,
  • Yifan Nie,
  • Shoulong Zhang,
  • Yahang Tang,
  • Qingrui Lu,
  • Hao Jiang

摘要

To investigate the dynamic mechanical behavior and energy evolution of coral reef limestone (CRL) under cyclic impact loading, a modified split Hopkinson pressure bar (SHPB) apparatus was employed to conduct tests on saturated CRL specimens at five confining pressures (0, 2, 4, 6, and 8 MPa). The results indicate that the dynamic stress–strain response of CRL can be divided into four stages. As the number of impact cycles increases, the compaction stage progressively lengthens, and the number of impact cycles sustained before failure increases with confining pressure. Increasing confining pressure enhances both the peak stress and the dynamic elastic modulus, while the peak strain and strain rate decrease correspondingly. The dynamic compressive strength of CRL exhibits strong strain rate sensitivity, which can be accurately described by a linear relationship. Both confining pressure and the number of impact cycles influence the energy distribution within CRL. Increasing confining pressure reduces the energy dissipation density and decreases the rate at which it increases with impact cycles. Furthermore, confining pressure decreases the damage variable of CRL specimens, thereby inhibiting damage accumulation.