Elfarhani Makram, Guesmi Fethi, Mkaddem Ali, Ghazali Sami, Rubaiee Saeed, Jarraya Abdessalem
LA2MP, National School of Engineers of Sfax, University of Sfax, P.O. Box 1173, Sfax 3038, Tunisia.
Department of Mechanical and Materials Engineering, FOE, University of Jeddah, P.O. Box 80327, Jeddah 21589, Saudi Arabia.
Materials (Basel). 2022 Jul 8;15(14):4792. doi: 10.3390/ma15144792.
The present work aims to determine the influence of Glass Fiber-Reinforced Polymer (GFRP) laminating configuration in heat generation during the dry edge trimming process. Temperature measurement experiments were conducted on pure epoxy matrix, 15% unidirectional glass fiber reinforced epoxy, and 28% silica sand-filled GFRP specimens through eight type-K thermocouples evenly distributed along the trim plans and connected to a data acquisition system. Infrared thermographic measurements were also conducted to investigate the tool temperature evolution while processing. It was found that perpendicular fiber edge milling induces a sharp increase with peak temperature measurements reaching 119 °C, while machining parallel to fiber leads to a maximum temperature history of 41 °C, which is very close to that obtained from the pure epoxy test. It was also found that the addition of silica sand grains in the GFRP matrix reduces both tool and specimen temperature magnitudes up to 67% for 90° plies and 14% for 0° plies compared to silica sand-free composite initial values. The heat partition was calculated from the measured (electric) and estimated energies for the tool, the workpiece, and chips, respectively. It appears from predictions that the addition of silica sand grains increases the heat conductivity of the GFRP materials (with rates of 20% for 0° fiber orientation and 10% for 90° fiber direction), while it reduces that conducted to the milling tool. Scanning Electron Microscopy (SEM) inspections helped detect the dominating machining defects relative to each GFRP configuration and explained the heat generation and dissipation effects in light of peak temperature measurements.
本研究旨在确定玻璃纤维增强聚合物（GFRP）层压结构对干边修整过程中发热的影响。通过沿修整平面均匀分布的八个K型热电偶对纯环氧基体、15%单向玻璃纤维增强环氧和28%硅砂填充GFRP试样进行了温度测量实验，并将其连接到数据采集系统。还进行了红外热成像测量，以研究加工过程中刀具温度的变化。结果发现，垂直纤维边缘铣削会导致温度急剧上升，峰值温度测量值达到119°C，而平行于纤维加工时的最高温度历程为41°C，这与纯环氧测试得到的结果非常接近。还发现，与不含硅砂的复合材料初始值相比，在GFRP基体中添加硅砂颗粒可使刀具和试样温度分别降低67%（90°铺层）和14%（0°铺层）。分别根据测量的（电）能量以及刀具、工件和切屑的估算能量计算了热分配。预测结果表明，添加硅砂颗粒会提高GFRP材料的热导率（0°纤维取向时提高20%，90°纤维方向时提高10%），同时会降低传导到铣刀的热量。扫描电子显微镜（SEM）检查有助于检测每种GFRP结构中主要的加工缺陷，并根据峰值温度测量结果解释发热和散热效应。
