三种梁纯弯曲正应力的理论与实验研究  

Theoretical Analysis and Experimental Study on Normal Stress of Three Kinds of Beams Subjected to Pure Bending

作　　者：陈红兵[1] 李丽[1] 姚丽萍[1] 郑应彬[1] CHEN Hongbing;LI Li;YAO Liping;ZHENG Yingbin(College of Engineering and Technology,Southwest University,Chongqing 400716,China)

机构地区：[1]西南大学工程技术学院,重庆400716

出　　处：《实验科学与技术》2021年第4期18-23,共6页Experiment Science and Technology

基　　金：西南大学实验技术研究项目(SYJ2021019);重庆市高等教育教学改革研究项目(202048);国家自然科学基金面上项目(51875480)。

摘　　要：该文对单根矩形截面梁、叠梁和组合梁这三种梁的纯弯曲正应力进行了理论分析计算和电测法实验测试。实验数据结果验证了理论计算和实验方法的正确性,揭示了三种梁纯弯曲正应力的分布规律。实验数据表明叠梁的弯曲正应力最大,组合梁次之,单根矩形截面梁的最小。另外,分析讨论了某些实验数据误差较大的原因。通过增加实验内容和难度,有利于促使学生掌握更多的材料力学知识,锻炼学生的实践动手能力,可以为其他高校的材料力学实验教学提供参考。The normal stresses of pure bending of a single rectangular cross-section beam,laminated beam and composite beam have been theoretically analyzed and calculated and experimentally tested by electrical measurement method in this paper.Through the analysis of the measured data,the correctness of theoretical calculations and experimental methods are verified,and the normal stress distribution laws of the three beams are revealed.The data shows that the normal stress of pure bending of the laminated beam is the largest,followed by that of the composite beam,and that of the single rectangular cross-section beam is the smallest.In addition,the reasons for the large errors of some experimental data are analyzed and discussed.By increasing the content and difficulty of the experiment,it is conducive to promote students to master more knowledge of material mechanics and exercise their practical skills.The result can provide a reference for the experimental teaching of material mechanics in other colleges and universities.

关 键 词：矩形截面梁 叠梁 组合梁 弯曲正应力 电测法 

分 类 号：O341[理学—固体力学]