Incubation time approach in rock fracture dynamics

被引：14
作者：
Smirnov, V [2 ]
Petrov, Yuri, V [1 ,3 ]
Bratov, V [3 ]
机构：
[1] St Petersburg State Univ, St Petersburg 198504, Russia
[2] St Petersburg State Transport Univ, St Petersburg 198103, Russia
[3] Russian Acad Sci, Inst Problems Mech Engn, St Petersburg 199178, Russia
来源：
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY | 2012年 / 55卷 / 01期
关键词：
incubation time; dynamic fracture; rocks; dynamic strength; fracture toughness; crack resistance; energy and momentum input; fracture process optimization; TEMPERATURE-DEPENDENCE; CRACK INITIATION; STRENGTH; TOUGHNESS; CRITERION;
D O I：
10.1007/s11433-011-4579-3
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The paper is summarizing latest results connected with application of the incubation time approach to problems of dynamic fracture of rock materials. Incubation time based fracture criteria for intact media and media with cracks are discussed. Available experimental data on high rate fracture of different rock materials and incubation time based fracture criteria are used in order to evaluate critical parameters of causing fracture in these materials. Previously discovered possibility to optimize (minimize) energy input for fracture is discussed in connection to industrial rock fracture processes. It is shown that optimal value of momentum associated with critical load in order to initialize fracture in rock media does strongly depend on the incubation time and the impact duration. Existence of optimal load shapes minimizing momentum for a single fracturing impact or a sequence of periodic fracturing impacts is demonstrated.
引用
收藏
页码：78 / 85
页数：8
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