导致混凝土和岩石断裂的脉冲载荷的阈值特性(英文)

Threshold Characteristics of Pulse Loads Causing Fracture on an Example of Concrete and Rocks

定义了冲击阈值参数,给出了2μs短脉冲加载下混凝土和岩石裂缝扩展的实验结果,裂纹表面加载采用电爆炸方法实现.依据裂纹长度依赖于储能的关系,定义了给定脉冲宽度的载荷阈值.提出了采用此方法定义断裂有效表面能的理论可行性.

The technique of definition of threshold parameters of an impact is shown. The experimental results on crack extension in concrete and rocks under the short pulse （2 μs） of loading are presented. The loading was carried out on the crack surface by means of an installation of conductor explosion. The dependence of the crack length on the stored energy allows to define the threshold amplitude of the impact for the given duration of the pulse. The possibility in principle of definition of effective surface energy of fracture within the limits of the developed approach is shown.