Wysmulski Pawel
Department Machine Design and Mechatronics, Faculty of Mechanical Engineering, Lublin University of Technology, 20-618 Lublin, Poland.
Materials (Basel). 2025 Jul 23;18(15):3452. doi: 10.3390/ma18153452.
This study presents a detailed analysis of the influence of hole presence and size on the behavior of CFRP composite plates subjected to axial compression. The plates were manufactured by an autoclave method from eight-ply laminate in a symmetrical fiber arrangement [45°/-45°/90°/0°/90°/-45°/45°]. Four central hole plates of 0 mm (reference), 2 mm, 4 mm, and 8 mm in diameter were analyzed. Tests were conducted using a Cometech universal testing machine in combination with the ARAMIS digital image correlation (DIC) system, enabling the non-contact measurement of real-time displacements and local deformations in the region of interest. The novel feature of this work was its dual use of independent measurement methods-machine-based and DIC-based-allowing for the assessment of boundary condition effects and grip slippage on failure load accuracy. The experiments were carried out until complete structural failure, enabling a post-critical analysis of material behavior and failure modes for different geometric configurations. The study investigated load-deflection and load-shortening curves, failure mechanisms, and ultimate loads. The results showed that the presence of a hole leads to localized deformation, a change in the failure mode, and a nonlinear reduction in load-carrying capacity-by approximately 30% for the largest hole. These findings provide complementary data for the design of thin-walled composite components with technological openings and serve as a robust reference for numerical model validation.
本研究详细分析了孔洞的存在和尺寸对承受轴向压缩的碳纤维增强复合材料（CFRP）板性能的影响。这些板材采用热压罐法由八层对称纤维排列[45°/-45°/90°/0°/90°/-45°/45°]的层压板制成。分析了直径为0毫米（参考）、2毫米、4毫米和8毫米的四种中心开孔板。试验使用Cometech万能试验机结合ARAMIS数字图像相关（DIC）系统进行，能够对感兴趣区域的实时位移和局部变形进行非接触测量。这项工作的新颖之处在于其双重使用独立测量方法——基于机器的方法和基于DIC的方法——从而能够评估边界条件效应和夹具滑移对破坏载荷精度的影响。实验进行到结构完全破坏，从而能够对不同几何构型的材料行为和破坏模式进行临界后分析。该研究调查了载荷-挠度曲线、载荷-缩短曲线、破坏机制和极限载荷。结果表明，孔洞的存在会导致局部变形、破坏模式改变以及承载能力非线性降低——最大孔洞导致承载能力降低约30%。这些发现为具有工艺开孔的薄壁复合材料构件设计提供了补充数据，并为数值模型验证提供了可靠参考。
