文章摘要
考虑加载速率与厚径比影响的 巴西圆盘劈裂强度分析
Analysis of brazilian splitting strength considering effects ofloading rate and thickness-to-diameter ratios
  
DOI:
中文关键词: 巴西试验  厚径比  加载速率  数值模拟
英文关键词: Brazilian test  thickness-to-diameter ratios  loading rate  numerical simulation
基金项目:国家自然科学基金资助项目(51274097,51174088);湖南省自然科学基金资助项目(2015JJ2067);湖南省教育厅资助科研项目(13A020)
作者单位
罗世林1,万文1,2,赵延林1,2,唐劲舟1,王亚1 1.湖南科技大学 资源环境与安全工程学院湖南 湘潭 411201 2.湖南科技大学 煤矿安全开采技术湖南省重点实验室湖南 湘潭 411201 
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中文摘要:
      为综合研究加载速率和厚径比2个因素对测定茅口灰岩抗拉强度的影响关系,开展了一系列采用对称小圆弧加载方式下的巴西试验;通过ANSYS有限差分软件模拟巴西劈裂试验,结合Griffith强度理论分析不同厚径比圆盘试样在不同加载速率下的等效应力分布规律.试验研究结果表明:岩石抗拉强度会随试验加载速率的增加而增大,同时随厚径比的增大呈三次函数衰减关系.数值计算结果表明:越靠近圆盘试样端面中心点,等效应力值越大;除个别点处应力集中外,端面中心点的等效应力值也会随着加载速率的增加而增加;圆盘的起裂位置亦发生在端面中心点处.在此基础上对岩石抗拉强度公式进行修正,建立了更加真实的考虑加载速率与厚径比影响的巴西圆盘劈裂强度修正公式.
英文摘要:
      To study the relationship of thickness-to-diameter ratios and loading ratios two factors on Maokou limestone tensile strength, had a series of Brazil tests under small arc symmetrical loading. Using finite difference software ANSYS to simulate Brazilian Splitting test, and analysis equivalent stress distribution rules in different thickness to diameter ratio disc specimens under different loading rate, tests show that: rock tensile strength is linear increasing with the increase of loading rate, Brazilian Splitting Strength reduce in cubic function with the increase of thickness-to-diameter ratios.3D numerical results show that: the closer the center of the disc of the sample ends, the greater the value of the equivalent stress; in addition to individual points of stress concentration, equivalent stress value increased with the increase of loading rate at the center of the ends, the first fracture starting point is at the center of the ends. Based on which test results of Brazil split was revised to get a more real tensile strength considering effects of loading rate and thickness-to-diameter ratios.
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