为了研究超声对材料力学行为 (屈服极限 ,硬化率 ,塑性变形 )的影响 ,设计研制了一套超声疲劳拉伸实验装置 ;该装置主要由超声波发生器、超声波换能器、超声波变幅杆等组成 .同时利用该装置对紫铜进行了疲劳拉伸实验 ,并得到了一些新的结果 ,诸如 :材料屈服点降低、硬化率降低等 . In order to study the effect of ultrasound on the mechanical behavior of the material (yield limit, hardening rate, plastic deformation), a set of ultrasonic fatigue tensile testing device was designed and developed. The device mainly consists of ultrasonic generator, ultrasonic transducer, ultrasonic horn At the same time, the device was used to carry out the tensile fatigue test of copper, and some new results were obtained, such as the decrease of the yield point of the material and the decrease of the hardening rate.