Salem Brahim, Mkaddem Ali, Habak Malek, Dobah Yousef, Jarraya Abdessalem
Laboratoire de Mécanique, Modélisation et Productique (LA2MP), National School of Engineering of Sfax, University of Sfax, Sfax 3038, Tunisia.
Department of Mechanical and Materials Engineering, FOE, University of Jeddah, Jeddah 21589, Saudi Arabia.
Polymers (Basel). 2025 Apr 12;17(8):1047. doi: 10.3390/polym17081047.
This paper reports an investigation of the thermomechanical behavior at the interface of GFRP/Al composite stacks when the stacking arrangement varies. A temperature-coupled damage approach was developed to simulate thermal energy transfer and damage propagation at metallic-to-composite interface. The proposed model was then implemented into ABAQUS/Explicit finite element code using user-defined subroutine VUMAT finely imbricated with VDFLUX. Unlike to previous models, oblique cutting configuration (OCC) involving double-inclination of the tool was proposed to simulate finely the material removal process owing to drill action. Drilling trials involving the cutting speed and the stacking arrangement were conducted to support the proposed approach. The predictions revealed that increasing the spindle speed significantly impacts the temperature distribution and subsurface thermal damage. An exponential temperature law was derived for predicting temperature variation with the cutting speed and identifying thermal saturation at the interface. The sensitivity of the composite behavior to the stacking arrangement (GFRP → Al vs. Al → GFRP) was well highlighted. The results indicated that attacking the structure from the GFRP side results in higher interfacial temperatures due to GFRP's lower thermal conductivity. These findings contribute to understanding the heat-affected zone in GFRP, and, hence, provide guidance to minimize thermal damage in industrial drilling of the hybrid stacks.
本文报道了对玻璃纤维增强塑料（GFRP）/铝复合材料叠层界面在堆叠排列变化时的热机械行为的研究。开发了一种温度耦合损伤方法，以模拟金属与复合材料界面处的热能传递和损伤扩展。然后，使用与VDFLUX精细交织的用户定义子程序VUMAT，将所提出的模型应用于ABAQUS/Explicit有限元代码中。与先前的模型不同，提出了涉及刀具双倾斜的斜切配置（OCC），以精细模拟钻孔作用导致的材料去除过程。进行了涉及切削速度和堆叠排列的钻孔试验，以支持所提出的方法。预测结果表明，提高主轴速度会显著影响温度分布和亚表面热损伤。推导了指数温度定律，用于预测温度随切削速度的变化，并确定界面处的热饱和。复合材料行为对堆叠排列（GFRP→Al与Al→GFRP）的敏感性得到了很好的体现。结果表明，由于GFRP的热导率较低，从GFRP一侧攻击结构会导致更高的界面温度。这些发现有助于理解GFRP中的热影响区，从而为在混合叠层的工业钻孔中最小化热损伤提供指导。
