光测力学方法在冲击动力学实验教学中的应用  

Application of optical methods in experimental teaching of impact dynamics

作　　者：刘伟 杨国梁[1] 马鑫民[1] 王雁冰[1] LIU Wei;YANG Guoliang;MA Xinmin;WANG Yanbing(School of Mechanics and Civil Engineering,China University of Mining and Technology(Beijing),Beijing 100083,China)

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《实验技术与管理》2022年第7期148-154,共7页Experimental Technology and Management

基　　金：中国矿业大学(北京)本科教育教学改革与研究项目(J200708);中国矿业大学(北京)大学生创新训练项目(202106074)。

摘　　要：该文提出将光测力学方法引入冲击动力学实验的教学改革方法。首先,以落锤冲击实验为例,应用阵列式高速摄像系统和三种光测力学方法(数字图像相关法、焦散线法和数字梯度敏感法),开展了三点弯曲梁试件低速冲击响应的教学研究。随后,以分离式霍普金森压杆实验为例,采用数字图像相关法测量了含缺口巴西半圆盘试件全场位移,并引导学生对实验数据进行分析。该实验方法克服了传统应变片电测法单点测量的局限性,提高了冲击响应测量的直观性,有助于冲击动力学实验教学开展。This paper proposes the teaching reform method of introducing optical methods into the experiments of impact dynamics.Firstly,taking the drop hammer impact experiment as an example,the teaching research on the low-speed impact response of three-point bending beam specimens is carried out by using the array high-speed camera system and three optical methods(digital image correlation method,caustic method and digital gradient sensing method).Then,taking the split Hopkinson pressure bar experiment as an example,the full field displacements of Brazil half disk specimen with a notch are measured by digital image correlation method,and the students are guided to analyze the experimental data.This experimental method overcomes the single point measurements of traditional strain gauge method and improves the intuition of impact response measurements,and is helpful to the teaching of the experiments of impact dynamics.

关 键 词：光测力学 冲击动力学 实验教学 动态变形测量 实验力学 

分 类 号：O348.1[理学—固体力学]