摘要
采用轴向应变控制法,在电液伺服疲劳试验机MTS809上,对缠绕碳纤维增强聚合物（加固试件）和不缠碳纤维增强聚合物（母材）的低屈服点钢BLY160试样进行低周疲劳试验。研究了两种试验钢的低周疲劳性能,如循环应力响应特征、循环应力-应变关系以及低周疲劳寿命。通过拟合Hollomon公式和Manson-Coffin公式,推导出母材和加固试件的低周疲劳寿命预测公式。结果表明：母材和加固试件的裂纹源均萌生于试件表面,且加固试件表面有多处裂纹源,其疲劳断口韧窝比母材的更小、更密。缠绕碳纤维布能有效提高低屈服点钢的低周疲劳性能。
Low cycle fatigue tests of low yield point steel BLY 160 with/without carbon fiber reinforced polymer （CFRP）wrapping（named reinforced specimen and base metal specimen, respectively） were carried out on MTS 809 servo-hydraulicmaterial testing machine by using axial strain control method. The low cycle fatigue （LCF） properties of the two experimentsteels were researched, such as cyclic stress response characteristics, cyclic stress-strain relationships and low-cycle fatiguelife. The low cycle fatigue life predication equation of base metal and reinforced specimens was derived by fitting Hollomonequation and Coffin-Manson equation. The results show that the cracks of base metal and reinforced specimens initiate at thesurface of the specimens, and the surface of reinforced specimens has several crack sources, and the dimples in its fatiguefracture is finer and denser than that of the base metal specimens. The LCF performances of the low yield point steel could beimproved by wrapping CFRP.
作者
付磊
王清远
罗云蓉
段恒
姚激
孔清泉
FU Lei1, WANG Qingyuan2,3, LUO Ytmrong1, DUAN Heng1,4, YAO Ji4, KONG Qingquan3(1. School of Mechanical Engineering, Sichuan University of Science ＆ Engineering, Zigong 643000, China; 2. School of Aeronautics and Astronautics, Sichuan University, Chengdu 610065, China; 3. School of Mechanical Engineering, Chengdu University, Chengdu 610106, China; 4. Institute of Civil Engineering, Kunming University of Science and Technology, Kunming 650000, Chin)
出处
《热加工工艺》
CSCD
北大核心
2018年第4期100-104,共5页
Hot Working Technology
基金
国家自然科学基金项目(11327801,11572057)
教育部创新团队项目(IRT14R37)
四川省科技支撑计划项目(2016GZ0294,2015JPT0001)
四川省教育厅项目计划支撑项目(16ZB0255)
过程装备与控制工程四川省高校重点实验室基金项目(GK201501)
材料腐蚀与防护四川省重点实验室基金项目(2012CL10,2016CL17)
四川理工学院人才引进项目(2015RC34)
