删除或更新信息,请邮件至freekaoyan#163.com(#换成@)

均质砂岩损伤临界值的研究及SHPB试验验证

本站小编 Free考研考试/2021-12-21

本文二维码信息
二维码(扫一下试试看!)
均质砂岩损伤临界值的研究及SHPB试验验证
Theoretical Study and SHPB Experimental Verification on the Critical Damage of Uniform Sandstone
投稿时间:2016-03-24
DOI:10.15918/j.tbit1001-0645.2017.08.007
中文关键词:元胞模型SHPB试验砂岩损伤临界值
English Keywords:cellular modelSHPB experimentsandstonecritical damage
基金项目:国家自然科学基金资助项目(51574247,10272109);国家教育部高等学校博士学科点专项科研基金资助课题(20060290009);中央高校基本科研业务专项资金资助项目(2010QL05)
作者单位E-mail
李胜林中国矿业大学(北京) 力学与建筑工程学院, 北京 100083
张青成金诚信矿业管理股份有限公司, 北京 101500
吴帅峰中国矿业大学(北京) 力学与建筑工程学院, 北京 10008352awu@163.com
刘振帅中国矿业大学(北京) 力学与建筑工程学院, 北京 100083
摘要点击次数:752
全文下载次数:1093
中文摘要:
砂岩在冲击荷载下,损伤量D通常在小于1的情况下就发生破坏,存在损伤临界值.本文首先根据分形几何理论和砂岩结构特征,建立2×3的元胞模型,理论解析出砂岩的不稳定损伤临界值为0.4,阶段变化的损伤临界值为0.119.然后通过直径50 mm的SHPB试验结果分析,表明在砂岩动态损伤演化过程中有两个临界点,第1点为从线形损伤阶段到加快损伤阶段的临界点,对应的损伤量约为0.1;第2点为从损伤阶段到破坏阶段的临界点,对应的损伤量约为0.4,与理论研究十分吻合.该研究揭示了砂岩在损伤演化过程中发生破坏的临界问题.
English Summary:
Under the impact load, sandstone usually fails when the damage quantity D is less than 1, and there exists the critical damage. Based on the fractal geometry theory and the structure features of sandstone, a 2×3 cellular model was established in this paper. The instability critical damage of sandstone is 0.4 after theoretical calculation, and the critical damage of stage change is 0.119. Results analysis of the Φ50 mm SHPB experiment shows that there are two critical points in the dynamic damage process of sandstone:the first critical point is from the linear damage stage to the accelerated damage stage, and the corresponded damage quantity is about 0.1; the second critical point is from the damage stage to the failure stage, and the corresponded damage quantity is about 0.4, which agrees well with the theoretical research. The study reveals the critical problem of sandstone failure in the damage process.
查看全文查看/发表评论下载PDF阅读器
相关话题/北京 中国矿业大学 力学 建筑工程学院 中文