Abstract: Natural frequency of a cantilever beam can be linked to the elastic modulus of the beam material. With a mini-accelerometer mounted on the free end, the bending vibration frequency of a steel rod is obtained, and then the elastic modulus of the rod steel is derived. The added mass of accelerometer to the beam has been taken into account to modify the frequency modulus relationship. Final measurement result of the elastic modulus is quite consistent with the given value, accompanying a relative uncertainty of 0.66%. The principle of the experiment is clear and the construction of used setup is simple. More convenience of minimum operation comes with the mentioned advantages.

Key words: elastic modulus, cantilever beam, first natural frequency, accelerometer