Investigation on entrance and exit delamination damage in drilling CF/PEEK via experimental and machine learning approaches

IF 8.3 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2026-05-01 Epub Date: 2026-02-12 DOI:10.1016/j.tws.2026.114663

Zhijian Meng , Shunuan Liu , Yuchen Cai , Qi Yang , Bin Luo , Kaifu Zhang

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引用次数: 0

Abstract

As a thermoplastic composite with superior sustainability and mechanical performance, carbon fiber reinforced polyetheretherketone (CF/PEEK) has become the preferred material for fabricating prototype components in next-generation aircraft applications. However, drilling-induced delamination damage is prone to occur due to the material’s anisotropy and lamination characteristics, severely compromising the service reliability of CF/PEEK components. This study focuses on the entrance and exit delamination damage in drilling CF/PEEK. Specifically, drilling experiments under various parameters are conducted to examine the distribution characteristics and formation mechanisms of delamination. Subsequently, considering thrust force, torque, and drilling temperature, a small-sample sensitivity analysis framework based on a hyperparameter-optimized support vector regression (SVR) model and the Sobol method is developed to identify sensitivity factors influencing delamination. The results indicate that delamination primarily occurs within the fiber cutting angle range of 90°-180°, where fiber bending fractures lead to an increase in subsurface damage. The hole entrance primarily exhibits mode Ⅲ delamination caused by intralaminar tearing, whereas the hole exit primarily exhibits mode III delamination, accompanied by mode I delamination due to interlaminar debonding. Furthermore, torque is identified as the most sensitive factor influencing both entrance and exit delamination. Compared to entrance delamination, the exit delamination is more susceptible to interactions among multiple factors.

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基于实验和机器学习方法的CF/PEEK钻井进出口分层损伤研究

作为一种具有优异可持续性和机械性能的热塑性复合材料，碳纤维增强聚醚醚酮（CF/PEEK）已成为制造下一代飞机原型部件的首选材料。然而，由于材料的各向异性和层压特性，容易发生钻井引起的脱层损伤，严重影响CF/PEEK组件的使用可靠性。本文主要研究了CF/PEEK钻井的进出口分层损伤。具体而言，通过不同参数下的钻孔实验，研究脱层的分布特征和形成机制。随后，考虑推力、扭矩和钻井温度，建立了基于超参数优化支持向量回归（SVR）模型和Sobol方法的小样本灵敏度分析框架，识别影响分层的敏感性因素。结果表明：在纤维切割角度为90°~ 180°范围内，分层主要发生，纤维弯曲断裂导致亚表面损伤增加；孔口主要表现为层间撕裂引起的Ⅲ型分层，孔口主要表现为III型分层，同时伴有层间脱粘引起的I型分层。此外，扭矩是影响入口和出口分层的最敏感因素。与入口分层相比，出口分层更容易受到多种因素相互作用的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.