碳纤维增强树脂基复合材料加工表面粗糙度对疲劳性能的影响
Effect of Machined Surface Roughness on Fatigue Performance ofCarbon Fiber Reinforced Polymer Composite
摘 要
采用磨削和铣削（顺铣、逆铣）加工工艺获得不同表面粗糙度Sa的碳纤维增强树脂基（CFRP）复合材料试样并进行拉-拉疲劳试验，基于刚度退化模型分析了加工表面粗糙度对疲劳性能的影响。结果表明：磨削、顺铣和逆铣试样的Sa分别为1.2，3.2，5.9 μm；磨削试样0°纤维铺层表面纤维缺失，存在空隙，铣削试样在45°纤维铺层表面存在较多凹坑，其中顺铣试样凹坑更多且更深；磨削试样的疲劳寿命最高，逆铣试样次之，顺铣试样最低；随着Sa的增大，CFRP复合材料试样表面裂纹迅速萌生扩展，刚度退化初始阶段的退化速率升高，刚度退化I阶段更快结束，试样的疲劳寿命降低。
三维表面粗糙度Sa
磨削
铣削
疲劳寿命
刚度退化
carbon fiber reinforced polymer composite
three-dimensional surface roughness Sa
grinding
milling
fatigue life
stiffness degradation
Abstract
Carbon fiber reinforced polymer composite (CFRP) samples with different surface roughness Sa were obtained by grinding and milling (up-milling and down-milling) processes, and tensile-tension fatigue tests were carried out. The effect of machined surface roughness on fatigue performance was studied based on the stiffness degradation model. The results show that the Sa of the grinding, up-milling and down-milling samples were 1.2, 3.2, 5.9 μm, respectively. Some fibers of the 0° fiber layer of the grinding samples were missing, resulting in voids. The milling samples had many pits on the surface of the 45° fiber layer, and the pits in the down-milling samples were more and deeper. The fatigue life of the grinding samples was the highest, followed by the up-milling samples, and the down-milling samples was the lowest. With increasing Sa, the surface cracks of the CFRP samples rapidly initiated and propagated, the degradation rate of the initial stage of stiffness degradation increased, the stage I of stiffness degradation ended sooner, and the fatigue life of the samples decreased.
中图分类号 TH145 DOI 10.11973/jxgccl202201015
所属栏目 材料性能及应用
基金项目 国家科技重大专项项目（2017-VII-0015-0111）；南京航空航天大学研究生创新基地（实验室）开放基金资助项目（kfjj20190507）
收稿日期 2020/11/16
修改稿日期 2021/11/22
网络出版日期
作者单位点击查看
备注范文涛(1996-),男,安徽黄山人,硕士研究生
引用该论文: FAN Wentao,CHEN Yan,CHEN Yijia,XIE Songfeng. Effect of Machined Surface Roughness on Fatigue Performance ofCarbon Fiber Reinforced Polymer Composite[J]. Materials for mechancial engineering, 2022, 46(1): 91～96
范文涛,陈燕,陈逸佳,谢松峰. 碳纤维增强树脂基复合材料加工表面粗糙度对疲劳性能的影响[J]. 机械工程材料, 2022, 46(1): 91～96
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【6】MANDEGARIAN S,TAHERI-BEHROOZ F.A general energy based fatigue failure criterion for the carbon epoxy composites[J].Composite Structures,2020,235:111804.
【7】BROD M,JUST G,DEAN A,et al.Numerical modelling and simulation of fatigue damage in carbon fiber reinforced plastics at different stress ratios[J].Thin-Walled Structures,2019,139:219-231.
【8】方毅.湿热老化对碳纤维/环氧树脂板材拉伸疲劳性能的影响[D].哈尔滨:哈尔滨工业大学,2016. FANG Y.Effects of hygrothermal aging on the tensile fatigue behaviors of carbon fiber reinforced epoxy plates[D].Harbin:Harbin Institute of Technology,2016.
【9】DORMOHAMMDI S,GODINES C,ABDI F,et al.Damage-tolerant composite design principles for aircraft components under fatigue service loading using multi-scale progressive failure analysis[J].Journal of Composite Materials,2017,51(15):2181-2202.
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【11】HIGHSMITH A L,REIFSNIDER K L.Stiffness-reduction mechanisms in composite laminates[M]//Damage in Composite Materials:Basic Mechanisms,Accumulation,Tolerance,and Characterization.West Conshohocken:ASTM International,1982:103-103-15.
【12】翟洪军,姚卫星.纤维增强树脂基复合材料的疲劳剩余刚度研究进展[J].力学进展,2002,32(1):69-80. ZHAI H J,YAO W X.A survey on stiffness reduction models of fiber reinforced plastics under cyclic loading[J].Advances in Mechanics,2002,32(1):69-80.
【13】ANANDAN N,RAMULU M.Study of machining induced surface defects and its effect on fatigue performance of AZ91/15%SiCp metal matrix composite[J].Journal of Magnesium and Alloys,2020,8(2):387-395.
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