Analysis and Control of Surface Delamination Defects During Milling of Orthogonal Aramid Fiber‑Reinforced Composites Laminates  

正交芳纶纤维增强复合材料层合板铣削过程中表面脱层缺陷的分析与控制

作　　者：SHI Zhenyu DUAN Ningmin LI Xin WANG Zhaohui 史振宇;段宁民;李鑫;王兆辉(高效洁净机械制造教育部重点实验室,山东大学,济南250061;山东大学机械工程学院,济南250061)

机构地区：[1]Key Laboratory of High Efficiency and Clean Mechanical Manufacture,Ministry of Education,Shandong University,Jinan 250061,P.R.China [2]School of Mechanical Engineering,Shandong University,Jinan 250061,P.R.China

出　　处：《Transactions of Nanjing University of Aeronautics and Astronautics》2020年第3期353-359,共7页南京航空航天大学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.51975334);Key R&D Project of Shandong Province(No.2019JMRH0407);the Fundamental Research Funds of Shandong University Grant。

摘　　要：The aramid fiber-reinforced composites(AFRC)can increase the durability of corresponding applications such as aerospace,automobile and other large structural parts,due to the improvement in hardness,heat build-up,wear properties and green environmental protection.However,because of its complex multiphase structure and unique heterogeneity and anisotropy,the poor compression fatigue resistance and the incident surface fibrillation are inevitable.To improve the assembly precision of AFRC,mechanical processing is necessary to meet the dimensional accuracy.This paper focuses on the influence of contour milling parameters on delamination defects during milling of AFRC laminates.A series of milling experiments are conducted and two different kinds of delamination defects including tearing delamination and uncut-off delamination are investigated.A computing method and model based on brittle fracture for the two different types of delamination are established.The results can be used for explaining the mechanism and regularity of delamination defects.The control strategy of delamination defects and evaluation method of finished surface integrity are further discussed.The results are meaningful to optimize cutting parameters,and provide a clear understanding of surface defects control.芳纶纤维增强复合材料(AFRC)由于比强度高、比刚度高、耐疲劳性好、耐高温防热防腐蚀且可设计性好等特点,被广泛用于航空航天、汽车等大型结构件。由于纤维具有方向性,常常表现为一维织构化,在特定方向上性能较差,材料层间剪切强度小,成为材料在使役过中的重要隐患。为了提高芳纶纤维复合材料结构件的装配精度,通常采取制备材料后通过进行二次加工即切削加工的方法得到规定的形状,满足尺寸精度、表面粗糙度和装配工艺的要求。作者研究了铣削过程中铣削参数对层合板分层缺陷的影响规律,并进行了一系列的铣削试验。针对加工过程中存在的两种不同分层缺陷,撕裂和未切断分层缺陷进行了研究。论文建立了基于脆性断裂的两种不同分层型式的计算方法和模型并阐述了分层缺陷形成机理和规律。并进一步讨论了分层缺陷控制策略和已加工表面完整性的评价方法。论文的研究结果对于优化铣削参数以及表面缺陷的控制具有重要的指导意义。

关 键 词：aramid fiber-reinforced composites(AFRC) milling process delamination defects surface control prediction model 

分 类 号：TN925[电子电信—通信与信息系统]