摘要
对低碳钢进行了超声振动拉伸试验,证明了低碳钢在有超声和无超声拉伸时其拉伸力学性能是不一样的。在超声拉伸时,材料强度指标σs和σb以及弹性模量E都明显降低,表现出软化现象;延伸率、收缩率也有所降低,断裂时的变形力也降低。得出了超声波的频率及功率对材料软化程度的影响规律:在共振频率下材料的软化现象最为明显,偏离共振点,软化效果会立即减弱;在频率一定时,振动的功率越小,软化效果越差。
In this paper, the ultrasonic vibration tensile test of the Low Carbon steel was conducted. It has been confirmed that the mechanical properties of low carbon steel with ultrasonic and without ultrasonic stretch are not the same. In ultrasonic tensile, material strength index σs, σb and elastic modulus E are all decreased, which shows softening phenomenon; Elongation, shrinkage are also reduced, and the deformation force of fracture is reduced as well. In addition, a conclusion is drawn that the ultrasonic frequency and power have great influence on the material softening degree. The material softening phenomenon will be obvious under the resonance fre- quency and it will become worse when the frequency is deviated from the resonance point. For a certain frequency, the smaller of the vibration power, the worse of softening effect.
出处
《机床与液压》
北大核心
2013年第12期117-122,共6页
Machine Tool & Hydraulics
关键词
超声振动
拉伸试验
力学性能
ultrasonic vibration, tensile test, mechanical properties
