摘要
在课堂教学中发现,学生难以理解在被冲击物的水平方向上施加冲击物的重力来计算动荷因数。本文研究了不同水平静荷载的施加对冲击问题的影响,推导出水平冲击问题求解的通用公式,证明水平冲击问题与静荷载的施加方式及大小无关。若采用动荷因数法,需选择冲击物自身重力作为被冲击物的水平静载,才可得到教材中的结果。结合国外材料力学教材,介绍了水平冲击问题的另一种求解方法,拓宽了读者求解水平冲击的思路,并给出相应的教学建议。
In teaching practice it is found that students have difficulties in understanding the calculation of dynamic factor by using the gravity in the horizontal direction.Therefore,this paper presents the influence of horizontal load on axial impact problems and derives general equations to calculate the horizontal impact problem by energy methods.In this paper,it demonstrates that the horizontal impact has nothing to do with the application of horizontal load,while the gravity must be the horizontal load to obtain the equation in textbook when dynamic factor method is employed.Combining with foreign textbooks,another method is presented in this paper to deepen the understanding on horizontal impact problems and corresponding teaching advises are given for different circumstances at the end of the paper.
作者
李凯
赵新波
姚文莉
纪彩虹
LI Kai;ZHAO Xin-bo;YAO Wen-li;JI Cai-hong(School of Science,Qingdao University of Technology,Qingdao,Shandong 266033,China)
出处
《教育教学论坛》
2020年第20期290-292,共3页
Education And Teaching Forum
基金
2019年度山东省青年教师教育教学研究课题(19SDJ070)
青岛理工大学教学改革项目(F2017-056,F2018-016,084)。
关键词
材料力学
动荷载
水平冲击
动荷因数
Material Mechanics
dynamic load
horizontal impact
dynamic factor
