用打点计时器做激发源测量杨氏模量

Measuring the Young modulus using ticker-timer as excitation source

在用动态法测量杨氏模量实验中,在钢丝一端固定另一端自由的边界条件下,使用打点计时器作为激发源使钢丝进行横向受迫振动,当共振发生时将形成稳定的驻波,依据共振频率与材料杨氏模量的关系可以测定均匀棒状材料的杨氏模量.

When one end is fixed and the other free, the steel wire is forced to vibrate horizontally under the harmonic excitation of a ticker-timer in the experiment of measuring Young modulus by dy- namic method. The standing wave is established when a state of resonance is reached. The Young modulus of uniform material is determinated based on the relation between resonance frequency and Young modulus.