纤维增强复合材料高应变率拉伸实验技术研究  

A Study on High Strain Rate Tensile Experimental Technique Aimed at Fiber Reinforced Composite

作　　者：彭刚[1] 冯家臣[2] 胡时胜[1] 曲英章[2] 高英莉[2] 刘原栋[2] 

机构地区：[1]中国科学技术大学材料力学行为和设计重点实验室,合肥230027 [2]中国兵器工业集团第五三研究所,济南250031

出　　处：《实验力学》2004年第2期136-143,共8页Journal of Experimental Mechanics

摘　　要：本文对基于分离Hopkinson杆的反射式纤维增强复合材料动态拉伸实验技术进行了研究讨论。对加载杆中可能影响拉伸应力波波形实验分析的所有干扰波进行了较系统地定量分析研究,认为产生于试样端头与加载杆界面处的两主要干扰波对希望得到的应力波的测量和判别具有严重的不利影响,因此拉伸实验设计必须避开该主干扰波的重叠影响。文中对动态拉伸实验装置、实验要求及信号采集等作了分析。根据对试验结果的分析,针对复合材料动态拉伸实验技术的若干问题提出了一些处理方法和建议,诸如干扰波的规避、冲击信号合理测点的选取、加载杆长度匹配、复合材料拉伸试样的设计要求以及加载连接等问题。这些方法和建议包括在加载杆特定段上贴应变片,考虑到实验的准确性一般不用反射波进行数据计算处理,尽量缩短试样标距等。In this paper, the high strain rate dynamic tensile experimental techniques of reflecting type aimed at fiber-reinforced composite and based on Split Hopkinson Bar were investigated and discussed. All potential interfering waves influencing experimental measurement and analysis of tensile stress waves in loading bars were analyzed and studied systematically and quantitatively. The suggestion was put forward that two dominant interfering waves coming from interfaces between specimen ends and loading bars made a serious negative impact on experimental measurement and identification of expectant stress waves, therefore, the design of tensile experiments must keep away from superposition impact of the dominant interfering waves. The scheme of dynamic tensile experimental apparatus and the requirements on experimental technique and collection of signals were analyzed. Aiming at the problems from composite dynamic tensile experimental techniques, such as shunning interfering waves, and choosing reasonable points for measurements of impact signals, length matching of tensile loading bar, designing requirements of composite tensile specimen and attaching of specimen/bar under impact load etc., several suggestions are put forward according to the experimental results and analysis. For instance, you should put strain gauges on chosen special sections of loading bars. Considering the accuracy of experiments, the reflecting wave should not be used in data processing in general. You′d better shorten the specimen length used in data processing.

关 键 词：复合材料 应变率 拉伸实验 应力波 实验设计 

分 类 号：TB324[一般工业技术—材料科学与工程] O347.3[理学—固体力学]