超声振动单向拉伸20号钢内部应力及断口形貌分析(英文)  

Analysis of Internal Stress and Fracture Morphology for 20 Steel Under Ultrasonic Vibration Uniaxial Tensile

作　　者：程雪利[1] 赵明利[2] 秦军 刘传绍[2] 

机构地区：[1]河南机电高等专科学校机械工程系,河南新乡453000 [2]河南理工大学机械与动力工程学院,河南焦作454000 [3]四平市海格起重机器制造有限公司,吉林四平136000

出　　处：《机床与液压》2013年第6期107-110,共4页Machine Tool & Hydraulics

基　　金：The Education Department of Henan Province Natural Science Research Project(12A460004)

摘　　要：对20号钢进行了超声振动单向拉伸试验,对其内部应力进行了有限元分析,得出了工件在直径最小处两端的应力最大,中间次之,这和断口断裂的位置是一致的。研究了工件中心点处塑性应变及应力随时间变化的曲线,证明了在超声振动单向拉伸下工件内部受到的是一个交变的应力载荷。通过对超声与常态拉伸断口的比较,发现了所有断口都是杯锥型断口,而超声拉伸的断口杯状边缘更明显,断口内部更平整,断口更明亮;还发现了随着频率的降低,断口变得粗糙且不均匀,功率越大,典型疲劳条纹也越明显。In this paper, the ultrasonic vibration uniaxial tensile test of the #20 steel was conduc- ted 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 ten- sile 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 fa- tigue stripe is.

关 键 词：超声振动 单向拉伸 应力分析 断口形貌 

分 类 号：TG115.5[金属学及工艺—物理冶金]