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异型冲头下SHPB的动态响应与波动规律

发表时间:2013-02-15  浏览量:1253  下载量:533
全部作者: 周子龙,江益辉,邹洋,李国楠
作者单位: 中南大学资源与安全工程学院
摘 要: 异型冲头霍布金逊装置(split Hopkinson pressure bar, SHPB)方法由于信号振荡小、无弥散效应、截面应力均匀、可获得恒应变率加载、入射波重复性好等优点被广泛应用。为更精确使用这一方法,需对其测试中的动态响应和波动规律有深入的认识。运用有限元对异型冲头冲击下SHPB的响应特性和应力波分析发现:异型冲头冲击产生的应力波具有半正弦波形,并在传播中几乎不发生波形弥散。冲头冲击速度和产生的应力波峰值具有线性关系,但与圆柱形冲头情况不同。通过对异型冲头偏心冲击下入射杆表面的应力历程监测发现:偏心碰撞常常引起波形畸变和应力幅值下降,这些特征可以用来识别系统异常。
关 键 词: 动力学;异型冲头;霍布金逊装置;碰撞;动态响应;应力波传播
Title: Dynamic response and wave propagation of SHPB under impact of special shape striker
Author: ZHOU Zilong, JIANG Yihui, ZOU Yang, LI Guonan
Organization: School of Resources and Safety Engineering, Central South University
Abstract: Split Hopkinson pressure bar (SHPB) with the special shape striker has been widely accepted and used for its advantages of little oscillation, no dispersion effect, stress uniformity at cross-section, being able to get constant strain rates and good repeatability. In order to give more accurate information of this technique, it is necessary to understand its dynamic response and wave propagation characteristics in testing. Based on the analysis of dynamic response and wave propagation characteristics of SHPB with the special shape striker using finite element analyses, it was found that SHPB with the special shape striker gave a good half-sine incident wave, and had little wave dispersion in transmitting. The peak stress of incident wave had good linear relation with the impact velocities of the striker, but it was different with cylindrical striker. Oblique and off-axial impact analyses showed that the misalignment impacts usually triggered wave distortion and amplitude decrease, which could be used to identify the system abnormity.
Key words: dynamics; special shape striker; split Hopkinson pressure bar; impact; dynamic response; wave propagation
发表期数: 2013年2月第3期
引用格式: 周子龙,江益辉,邹洋,等. 异型冲头下SHPB的动态响应与波动规律[J]. 中国科技论文在线精品论文,2013,6(3):284-288.
 
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