《机床与液压》 Hydromechatronics Engineering

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稿件标题: Analysis of Internal Stress and Fracture Morphology for 20 Steel Under Ultrasonic Vibration Uniaxial Tensile
稿件作者: CHENG Xueli , ZHAO Mingli, QIN Jun, LIU Chuanshao
关键字词: ultrasonic vibration, uniaxial tensile, stress analysis,fracture morphology
文章摘要: In this paper, the ultrasonic vibration uniaxial tensile test of the #20 steel was conducted and the internal stress was analyzed by finite element method. It is concluded that the stress of workpiece on both ends of the minimum diameter place is the biggest and that of the middle is bigger, which is consistent with the position of the fracture. Since the plastic strain and stress curve are changed with time, it is proved that the internal workpiece is subject to an alternative stress load under ultrasonic vibration uniaxial tensile. Based on the comparison between the tensile fracture of the ultrasonic and that of the common condition, it is found that all the fracture is a cup of cone fracture type and the fracture has more apparent cup edges, more smooth and bright at ultrasound stretch. Furthermore, it is found that the fracture becomes coarse and uneven with the decrease of frequency. Therefore, the greater the power is,the more obvious the typical fatigue stripe is.
收录刊物: 2013.6
稿件基金: The Education Department of Henan Province Natural Science Research Project(12A460004)
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