NiTi-Al金属基复合材料梁固有频率调节特性理论与实验研究

上海交通大学学报（自然版） ›› 2015, Vol. 49 ›› Issue (09): 1300-1305.

NiTi-Al金属基复合材料梁固有频率调节特性理论与实验研究

王伊卿a，张腾a，匡新斌a，卢秉恒a，洪军a，徐明龙b

(西安交通大学 a.机械制造系统工程国家重点实验室;b.机械结构强度与振动国家重点实验室，西安 710049)

收稿日期:2014-09-05 出版日期:2015-09-30 发布日期:2015-09-30
基金资助:
机械结构强度与振动国家重点实验室开放课题（SV2013KF03），陕西省工业攻关项目（2014K0603）

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

(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

摘要/Abstract

摘要：

摘要：根据Timoshenko梁理论考虑NiTi回复应力作用，建立了NiTiAl金属基复合材料梁(简称复合梁)的自由振动微分方程，研究了复合梁的固有频率调节特性．对于悬臂梁，NiTi回复应力使复合梁呈压应力状态，造成固有频率降低，在梁长度80 mm、NiTi体积分数8%、预应变3%时，温度由20 ℃升至80 ℃，固有频率的减小量可达52.1%．对于固支梁，其内部应力状态取决于NiTi回复应力和热膨胀共同作用，使固支梁固有频率增加的最小NiTi体积分数约为20%．最后，利用超声波焊接技术制造了复合梁，通过热模态实验测试了NiTiAl悬臂梁固有频率随温度变化规律．结果表明，埋入NiTi能有效调节复合梁固有频率，且实验结果与理论计算结果规律一致.
关键词：中图分类号：文献标志码： A

关键词: 金属基复合材料, 形状记忆合金, 固有频率调节, 超声波焊接

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

中图分类号:

TH 122

王伊卿a，张腾a，匡新斌a，卢秉恒a，洪军a，徐明龙b. NiTi-Al金属基复合材料梁固有频率调节特性理论与实验研究[J]. 上海交通大学学报（自然版）, 2015, 49(09): 1300-1305.

WANG Yiqinga,ZHANG Tenga,KUANG Xinbina, LU Binghenga,HONG Juna,XU Minglongb. Theoretical and Experimental Research of Frequency Tuning Characteristics of NiTi-Al MMCs Beam[J]. Journal of Shanghai Jiaotong University, 2015, 49(09): 1300-1305.

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