Chen Chen, Wang Aixu, Zheng Zhi, Zhao Qing, Shi Zhanli, Bao Yongjie
Naval Architecture and Ocean Engineering College, Dalian Maritime University, Dalian 116026, China.
School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China.
Materials (Basel). 2023 Mar 24;16(7):2586. doi: 10.3390/ma16072586.
Carbon fiber reinforced plastics (CFRP)/titanium alloy (Ti) stacks have been widely used in aviation field due to the superior mechanical properties. During integrated drilling of CFRP/Ti stacks, serious damage occurs in the CFRP layer because of the disparate properties of two stack components. Heat accumulation and thermal induced damage are typical and critical issue during drilling stacks, especially in the interface region. In this study, in order to deeply analyze the thermal influence of the interface region, a numerical model based on the finite difference method is developed to predict the three-dimensional drilling temperature field. Experiments with accurate measurement point are conducted to valid the rational of temperature prediction model. The results confirm that the temperature distributions predicted by numerical study have good agreements with the experimental results and the maximum error is about 10.3%. Furtherly, based on the drilling experiments, it can be found that thermal damage induced by cutting heat occurs as discoloration rings around the hole which could cause the elastic modulus of resin matrix decrease. An empirical model of thermal damage with maximum drilling temperature of the interface region are developed with the correlation of R = 0.97. The findings point out that as the maximum drilling temperature exceeds 410 °C, serious thermal damage could occur in the resin matrix of CFRP layer.
碳纤维增强塑料（CFRP）/钛合金（Ti）叠层由于其优异的机械性能已在航空领域得到广泛应用。在CFRP/Ti叠层的整体钻孔过程中，由于两种叠层部件的性能差异，CFRP层会出现严重损伤。热量积累和热致损伤是钻孔叠层过程中的典型且关键问题，尤其是在界面区域。在本研究中，为了深入分析界面区域的热影响，基于有限差分法建立了一个数值模型来预测三维钻孔温度场。进行了具有精确测量点的实验以验证温度预测模型的合理性。结果证实，数值研究预测的温度分布与实验结果吻合良好，最大误差约为10.3%。此外，基于钻孔实验发现，切削热引起的热损伤表现为孔周围的变色环，这会导致树脂基体的弹性模量降低。建立了界面区域最大钻孔温度与热损伤的经验模型，相关系数R = 0.97。研究结果指出，当最大钻孔温度超过410℃时，CFRP层的树脂基体可能会发生严重的热损伤。
