Cerqueira Hugo R C, Matos João E, Esteves José L, Fernandes Susana C F, Durão Luis M P
ISEP, Polytechnic of Porto, rua Dr. António Bernardino de Almeida, 4249-015 Porto, Portugal.
INEGI Instituto de Ciência e Inovação em Engenharia Mecânica e Engenharia Industrial, 4200-465 Porto, Portugal.
Materials (Basel). 2025 Apr 1;18(7):1595. doi: 10.3390/ma18071595.
Composite materials are increasingly being implemented in various solutions, ranging from conventional applications, like furniture, to more advanced ones, such as aerospace, based on their excellent properties, such as high mechanical strength and low weight. There are applications in which these materials are coupled to other parts. To achieve this connection, drilling processes are commonly used. Drilling causes irreversible damage to the material, which influences the mechanical strength of the plates. This study was conducted on 48 carbon/epoxy plates, each with two drilled holes, based on DOE (design of experiments) and the Taguchi method to design the experimental plan and to validate the results. Three control factors were considered for drilling: drill bit type, cutting speed, and feed rate, as it is expected that a low feed rate and a high cutting speed is the drilling configuration that inflicts the least damage. Subsequently, these specimens were subjected to enhanced radiography and an image analysis processing tool based on MatLab to assess the data collected and compute damage results. At the end, in analyzing the results of the Taguchi method, it is possible to validate the assumptions on the influence of the drilling process in delamination extension.
由于具有诸如高机械强度和低重量等优异性能，复合材料越来越多地被应用于各种解决方案中，其应用范围从传统应用（如家具）到更先进的应用（如航空航天）。在一些应用中，这些材料会与其他部件连接。为实现这种连接，通常会使用钻孔工艺。钻孔会对材料造成不可逆的损伤，进而影响板材的机械强度。本研究基于实验设计（DOE）和田口方法，对48块碳/环氧板材进行了研究，每块板材有两个钻孔，以此来设计实验方案并验证结果。钻孔时考虑了三个控制因素：钻头类型、切削速度和进给速度，因为预计低进给速度和高切削速度是造成损伤最小的钻孔配置。随后，对这些试样进行增强射线照相，并使用基于MatLab的图像分析处理工具来评估收集到的数据并计算损伤结果。最后，在分析田口方法的结果时，可以验证关于钻孔工艺对分层扩展影响的假设。
