Analysis and prediction of axial force and exit damage in drilling of composites with delamination damage

IF 6.1 1区 工程技术 Q1 ENGINEERING, MANUFACTURING Journal of Manufacturing Processes Pub Date : 2024-11-04 DOI:10.1016/j.jmapro.2024.10.051
Shengping Zhang , Junshan Hu , Lei Xu , Jinyi Shen , Shanyong Xuan , Wei Tian
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Abstract

In aircraft maintenance, the delaminated composites are commonly repaired by riveting to inhibit delamination propagation and restore load-bearing performance. Making connecting holes in damaged areas is inevitable and may cause damage aggravation. This paper focused on the axial force and exit delamination damage in the drilling of delaminated composites. The influence factors including spindle speeds, feeds, drilling positions, and delamination locations and widths were considered for the drilling test, in which the axial force was collected to analyze the interaction mechanism between the tool and workpiece. The equivalent delamination factor was used to evaluate exit damage. The quadratic nonlinear regression (QNR) and Support Vector Regression (SVR) models were built to predict the cutting force curve and exit damage, respectively. The results revealed that the cutting force curves of the delaminated laminates produced obvious concavity when the drill bit reached the position of delamination. The optimal cutting conditions were 10,000 r/min and 100 mm/min for both intact and delaminated laminates in the drilling test. It was better to make holes in the inside of the damaged area to obtain small equivalent delamination factor and the increase of delamination width would aggravate exit damage. The errors of the QNR model were controlled within 13.40 % and 11.07 % for the intact and delaminated laminates, respectively. The maximum error of SVR models was 3.79 %. The results of QNR and SVR models had been proven to be accurate.
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分层损伤复合材料钻孔时轴向力和出口损伤的分析与预测
在飞机维修中,通常采用铆接方法修复分层复合材料,以抑制分层扩展并恢复承重性能。在受损区域打连接孔是不可避免的,而且可能会导致损伤加重。本文重点研究了分层复合材料钻孔过程中的轴向力和出口分层损伤。钻孔试验考虑了主轴转速、进给、钻孔位置、分层位置和宽度等影响因素,其中采集了轴向力以分析刀具和工件之间的相互作用机理。等效分层因子用于评估出口损伤。分别建立了二次非线性回归(QNR)和支持向量回归(SVR)模型来预测切削力曲线和出口损伤。结果表明,当钻头到达分层位置时,分层层压板的切削力曲线产生了明显的凹陷。在钻孔试验中,完整和分层板材的最佳切削条件均为 10,000 r/min 和 100 mm/min。最好在损坏区域的内侧钻孔,以获得较小的等效分层系数,分层宽度的增加会加剧出口损坏。完整和分层层压板的 QNR 模型误差分别控制在 13.40 % 和 11.07 % 以内。SVR 模型的最大误差为 3.79%。QNR 和 SVR 模型的结果证明是准确的。
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来源期刊
Journal of Manufacturing Processes
Journal of Manufacturing Processes ENGINEERING, MANUFACTURING-
CiteScore
10.20
自引率
11.30%
发文量
833
审稿时长
50 days
期刊介绍: The aim of the Journal of Manufacturing Processes (JMP) is to exchange current and future directions of manufacturing processes research, development and implementation, and to publish archival scholarly literature with a view to advancing state-of-the-art manufacturing processes and encouraging innovation for developing new and efficient processes. The journal will also publish from other research communities for rapid communication of innovative new concepts. Special-topic issues on emerging technologies and invited papers will also be published.
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