直流双臂电桥在测定金属杨氏模量中的应用  

APPLICATION OF DIRECT CURRENT DOUBLE ARMED BRIDGE IN MEASURING YOUNG'S MODULUS OF ELASTICITY ON METAL

作　　者：穆晓东[1] 盛爱兰[1] 

机构地区：[1]山东理工大学,淄博255049

出　　处：《大学物理实验》2004年第2期7-9,共3页Physical Experiment of College

摘　　要：本文阐述了QJ44型直流双臂电桥的适用范围及测量原理 ,将对长度及长度增量表示的金属杨氏模量公式换算成以电阻及电阻增量表示的杨氏模量公式。从而通过测量金属丝拉伸前后的电阻值 。The application extent and measuring principle for QJ44 type DC double armed bridge are elucidated in the paper.The formula for measuring Young's modulus of elasticity on metal based on the length and its increment is conversed as the formula based on relevant resistance and its increment.Therefore,Young's modulus of elasticity on metal can be calculated by measuring the resistance of the wires before and after pulling test.

关 键 词：高等教育 物理实验 直流双臂电桥 金属 杨氏模量 电阻测量 实验设计 

分 类 号：O4-4[理学—物理] O441