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本文用霍布金生压力杆法测定了砂岩、石灰岩的动态破碎应力和杨氏模量,其平均应变率达1×10~2～2×10~2/s。文中对使用这种方法涉及到的一些具体技术问题:如子弹、试件、输入和输出波导杆长度的选择;应变片粘贴;摩擦的影响等给予了详细讨论和说明。对长度/直径=1的试件,实验结果说明:动态与静态相比,砂岩的杨氏模量约提高了30％,强度约提高了40％;石灰岩的杨氏模量约提高了20％,强度约提高了30％。破坏的形式都是沿轴向破裂。
In this paper, dynamic crushing stress and Young’s modulus of sandstone and limestone were measured by Hobbkin pressure bar method. The average strain rate was 1×10~2~2×10~2/s. Some of the specific technical issues involved in using this method are discussed in this paper: bullets, specimens, input and output waveguide length selection, strain gauge pasting, friction effects, etc. are discussed and explained in detail. For the test piece with length/diameter=1, the experimental results show that the Young’s modulus of sandstone is about 30% higher and the strength is about 40% higher than that of static, and the Young’s modulus of limestone is increased by about 20%. The intensity is increased by about 30%. The destruction is in the form of an axial rupture.