轴向加载条件下中碳钢的超低周疲劳断裂设计  

Fracture design of medium carbon steel with extra-low cyclic fatigue under axial loading

作　　者：李有堂[1] 谭帅[1] 段红燕[1] 

机构地区：[1]兰州理工大学机电工程学院,甘肃兰州730050

出　　处：《兰州理工大学学报》2007年第3期156-160,共5页Journal of Lanzhou University of Technology

基　　金：甘肃省自然科学基金(3ZS061-A25-47)

摘　　要：研究中碳钢在轴向疲劳载荷下的超低周断裂问题，讨论载荷形式、切口几何参数和加载频率与断裂循环周次的关系，提出适宜于中碳钢材料在超低周轴向疲劳载荷下的断裂设计参数．结果表明，拉压疲劳载荷能够达刭低能耗、断面高质量、超低周次高效率的断裂设计要求，适宜的载荷频率为3～5Hz，适宜的切口参数为切口尖端半径r=0．1～0．3mm，切口角度a=60°，切口深度t／D=0．14～0．17．The fracture problem of medium carbon steel with was studied. The relationship of cycle times of fracture to the extra-low cyclic .fatigue under axial loading loading manner , geometry Of the notch, and loading frequency was discussed and the suitable parameters of fracture design for mectmm-carbon steel in extra-low axial fatigue loading were presented. Results of experiments indicatecl that the tensile-compression fatigue loading mode was suited to extra-low cycle fatigue Iraeture design of medium carbon steel with low energy consuming, high-quality fracture surface, low cycle times, and high efficiency. The appropriate parameters were as follow： loading frequency was 3-5 Hz, tip radius of notch-0. 1-0. 3 mm, notch angle60°, notch depth t/D=0. 14-0. 17.

关 键 词：超低周疲劳 断裂设计 中碳钢 应力断料 裂纹技术 

分 类 号：O346.2[理学—固体力学] TB12[理学—力学]