Temperature-dependent cutting physics in orthogonal cutting of carbon fibre reinforced thermoplastic (CFRTP) composite
Temperature-dependent cutting physics in orthogonal cutting of carbon fibre reinforced thermoplastic (CFRTP) composite
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DOI：
10.1016/j.compositesa.2023.107820
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发表时间：
2023-10-12
影响因子：
8.7
通讯作者：
Sun，Dan
中科院分区：
文献类型：
--
作者：
Ge，Jia;Tan，Wei;Sun，Dan
全球对减少碳排放的承诺推动了可持续碳纤维增强热塑性复合材料(CFRTP)的实施。然而，由于材料的延性-脆性成分以及对加工引起的高温的敏感性，CFRTP的加工面临着挑战。首次进行了CFRTP的温控正交切割实验(以CF/PEKK为例)，揭示了CFRTP的温控切割物理机制。研究了三种典型的切割温度，即23℃(环境温度)、100℃(<；PEKK的玻璃化转变温度(Tg))和200℃(>；Tg)以及四种典型的纤维切割方向(0°、45°、90°和135°)。用先进的显微镜分析了切屑微观形貌和表面/亚表面损伤的演变，揭示了材料去除的温度相关机理。实验结果通过一种新的微尺度有限元分析(FEA)模型进行了解释，该模型考虑了基体和界面的热软化。结果表明，随着温度的升高，切削物理性能的转变与热塑性基体的刚性/极限强度、界面结合强度和断裂韧性的退化有关，尤其是在玻璃化转变温度下。
The global commitment towards reducing carbon emissions drives the implementation of sustainable carbon-fibre-reinforced-thermoplastic composites (CFRTPs). However, the machining of CFRTPs presents challenges due to the material’s ductile–brittle composition and sensitivity to machining-induced high temperatures. For the first time, we conducted temperature-controlled orthogonal cutting of CFRTP (using CF/PEKK as a demonstrator) to unveil its temperature-dependent cutting physics. Three representative cutting temperatures, 23 ℃ (ambient temperature),100 ℃ (<PEKK’s glass transition temperature (Tg)) and 200 ℃ (>Tg) and four typical fibre cutting orientations (0°, 45°, 90°, and 135°) have been investigated. The evolution of chip microstructural morphology and surface/subsurface damage have been analysed by advanced microscopy to reveal temperature-dependent material removal mechanisms. The experimental results were elucidated through a novel microscale finite-element-analysis (FEA) model considering thermal softening of the matrix and interface. Results show the transition of the cutting physics with increasing temperature is associated to the degradation of the thermoplastic matrix stiffness/ultimate strength and interface bonding strength and fracture toughness, especially when > Tg.