大理岩动态劈裂拉伸实验的数值模拟及分析  

Numerical Simulation and Analysis on Dynamic Splitting Tension Test of Marble

作　　者：韩东波[1] 赵光明[1,2] 孟祥瑞[1] 

机构地区：[1]安徽理工大学能源与安全学院,安徽淮南市232001 [2]重庆大学西南资源开发及环境灾害控制工程教育部重点实验室,重庆400044

出　　处：《矿业研究与开发》2013年第3期18-21,共4页Mining Research and Development

基　　金：国家自然科学基金项目(51074005);教育部科学技术研究重点项目(210096);安徽高校省级自然科学研究重点项目(KJ2011A085)

摘　　要：通过ANSYS/LS-DYNA有限元软件对大理岩动态劈裂拉伸实验过程进行数值模拟,分别利用传统圆柱形冲锤、异形冲锤和在输入杆撞击端加波形整形器后再用传统圆柱形冲锤冲击的方式进行模拟,分析了动载荷下大理岩的破坏机理。研究试样在不同应变率下的破坏应变,讨论了冲锤以不同的冲击速度冲击与入射杆的轴向最大应力、试样的破坏时刻和破坏应变的关系。研究结果表明:在动态冲击作用下,随着冲击速度的增大,大理岩材料应变率呈增大趋势,而破坏时间和破坏应变呈减小趋势。The dynamic splitting tension test of the marble was simulated by the FEM software ANSYS/LS-DYNA. Marble failure mechanism under dynamic loading was analyzed respectively through using traditional cylindrical hammer, profiled hammer and traditional cylindrical hammer with pulse shaper attached to the input rod impact segment. The relationships between different hammer impact speed with the maximum axial stress of incident bar, destruction moment and failure strain of testing sample, as well as the failure strain with different strain rates, were studied. The results indicated that under the effect of dynamic impact, along with the impact velocity increases, the strain rate of marble material showed a trend of increase,while the time to failure and failure strain showed a trend of decreases.

关 键 词：大理岩 劈裂拉伸 数值模拟 波形整形器 应变率 

分 类 号：TD315.1[矿业工程—矿井建设]