岩石冲击试验联贴法波形整形技术模拟分析

Numerical Simulating Study on the Pulse Shaping Technique of Shaper-jointing-method in Rock Impact Experiments

为进一步研究岩石冲击试验中波形整形技术对入射波的整形效果,获得岩石冲击试验理想加载波形,利用ANSYS/LS-DYNA有限元动力分析软件对SHPB试验入射波进行了数值模拟,得到了经不同材料、直径的单片式波形整形器和不同组合方式的联贴式波形整形器整形后的入射波波形。研究发现:在相同的打击速度下,不同直径的单片式T2紫铜波形整形器整形效果不同。将不同材料单片式整形器进行联贴,构建组合式波形整形器,并对其整形效果进行模拟,发现组合式波形整形器比单独采用相同材料和直径的单片式整形器效果更佳。采用不同直径的整形器进行联贴是获得岩石冲击试验理想入射波波形的有效手段。

To make a further study on the shaping effect of the pulse shaping technique in rock impacting experiments and to get the ideal incident-wave in the impact test on rock,the ANSYS / LS-DYNA are used to simulate the modifying course of incident-wave. Different incident-waves were obtained which had been shaped by single-pieceshapers of different materials and diameters or combined shapers of different combining methods. It is found that the modifying effect of the pulse shaper made of T2 red copper varies under the identical blow velocity with different diameter. By jointing the single-piece-shapers made of different materials,the combined shapers are built and its modifying effect is simulated,finding that the modifying effect of the combined shapers is much better. It is concluded that jointing the shapers of different diameters is an effective method to get ideal incident-wave.