摘要
拉伸法测杨氏模量实验中,钢丝的直径数据为当砝码盘上加上预加砝码,用螺旋测微计在钢丝不同部位测6次得到的。这是以假设在整个实验过程中钢丝直径不会改变为条件的。但是在整个实验中,随着砝码的增加,钢丝逐渐拉长,直径逐渐减小。分析钢丝直径逐渐减小对最终杨氏模量测量结果的影响,为指导学生实验和改进测量杨氏模量实验方法提供依据。
For experiment measuring metals of Young＇s Modulus using stretched method,diameter of steel wire is measured by micrometer at six positions of steel wire.It＇s based on hypothesis that the diameter of steel wire wasn＇t changed.But throughout the whole experimental process,steel wire gradually stretches and its diameter gradually decreases along with the gradually added weights.Analysis the fluencies of decreased diameter of steel wire to Young＇s modulus,provide the basis for guiding students experimental and improving experiment method.
出处
《实验室科学》
2012年第2期81-84,89,共5页
Laboratory Science
基金
山西省普通本科高等教育教学改革研究项目(项目编号:20094422)
关键词
杨氏模量
钢丝直径
不确定度
Young＇s modulus
diameter of steel wire
uncertainty
