Journal of Shanghai Jiaotong University ›› 2015, Vol. 49 ›› Issue (09): 1300-1305.

• Mechanical instrumentation engineering • Previous Articles     Next Articles

Theoretical and Experimental Research of Frequency Tuning Characteristics of NiTi-Al MMCs Beam

WANG Yiqinga,ZHANG Tenga,KUANG Xinbina, LU Binghenga,HONG Juna,XU Minglongb   

  1. (a. State Key Laboratory for Manufacturing Systems Engineering; b. State Key Laboratory for Strength and Vibration of Mechanical Structure, Xi’an Jiaotong University, Xi’an 710049, China)
  • Received:2014-09-05 Online:2015-09-30 Published:2015-09-30

Abstract:

Abstract: A Timoshenko beam vibration model was built by considering the recovering stress of NiTi to predict the frequency tuning characteristics of NiTiAl beam. The recovering stress of NiTi resulted in the compressive stress in Clamped-Free (CF) beam which caused the frequency to decrease. For a 80 mm length CF beam with 8% of NiTi (prestrain 3%) embedded, the base frequency decreased by 52.1% when heated to 80 ℃, while the stress status of Clamped-Clamped (CC) beam depended on the combined effect of thermal expansion and NiTi recovering stress. At least 20% of NiTi should be embedded to increase the frequency of CC beam. Finally, theh NiTiAl MMCs beam was manufactured by ultrasonic welding process. A thermal modal experiment was conducted to study the frequency tuning characteristics of NiTi-Al CF beam. The results show that by embedding NiTi the frequency of the beam could be effectively tuned. The experimental data conforms to the theoretical data.

Key words: metal matrix composites, shape memory alloy; natural frequency tuning; ultrasonic welding

CLC Number: