实验力学报告.doc

实验力学报告 组 长： 组 员： 组 员： 指导老师： 目 录 摘要································································3 1 认识仪器··························································3 2 标定试验··························································3 2.1动态应变仪的标定·············································3 2.2对YE2538A程控静态应变仪中的力传感器进行标定·················5 2.3对力传感器的标定·············································7 2.4对应变引伸计的标定···········································9 3.弹性模量E、泊松比?测定···········································11 3.1测试原理与方法··············································11 3.2实验步骤····················································12 3.3数据处理····················································14 4.电阻应变片灵敏系数K片的测定及?测、?纵的比较试验·····················15 4.1测量原理及方法··············································15 4.2实际测应变值与通过挠度计算的应变值的比较实验················16 4.3 K片的测定···················································18 5. 创新性实验······················································20 实验总结与体会·····················································20 参考文献···························································21 摘要：首先对YE29003B动态应变仪、应变引伸计以及力传感器进行标定试验，记录了标定结果并应用到后续实验当中；其次，利用综合试验台进行了片状铝合金试件的拉伸试验，得出其弹性模量E和泊松比?;最后通过纯弯梁弯曲试验测得电阻应变片的灵敏系数K片，并对?测、?纵进行了对比与误差分析。 关键词：应变仪、标定、弹性模量、泊松比、引伸计、应变片、力传感器 认识仪器 本实验中所用到的实验仪器及其作用如表1所示： 表1 实验设备及其功能 实验设备 功能简介 YE1940C型应变仪 将电阻变化率按一定倍数放大为电压并输出 YE29003B应变标定器 标定YE1940C型应变仪通道灵敏系数 YE29006B转接盒 A/D转换器，将数据输给计算机 ZC25-4型绝缘电阻表 检验粘贴好的应变片的绝缘性 千分表及磁性表座 测量悬臂梁和简直梁的变形挠度 CL-YB-3/500K型力传感器 测量施加力的大小 YE29003A型桥盒 将电阻应变片组成各种桥路 AMPV-1D高精度测量显示仪 显示施加力的大小 应变引伸计 测量试件的应变 BE1250-5AA型电阻应变计 显示应变 2.标定实验 2.1动态应变仪的标定 （1）将YE29003B应变标定仪（如图1）接入动态应变仪中。 图1 应变标定仪 （2）检查所选通道与接入应变仪通道是否对应，并检查接入是否正常，若正常则通道对应指示灯灭，若不正常指示灯不灭，需要找出问题重新接入。 （3）选电路电压、增益和滤波频率。本次实验分别选择12V、1K、10Hz. （4）将应变标定仪调到0，然后将动态应变仪调零，先按下AUTO自动调零按钮，若没有完全为零或依然大于正负0.005V，可以用螺丝刀调节左边的微调FINE，若想得到比较整的实验数据可以调节trim。具体过程如下图2、3、4。 图2 按Auto按钮 图3 旋fine 图4 旋Trim （5）将应变标定仪分别拨到0、200、400、600、800、1000??,