Abstract Drilling of composite materials is a challenge in aviation and aerospace field. Delamination often occurs at the hole exit which can reduce the strength of the structure. In this study, to reduce delamination, an analytical model with thermal effect is proposed to predict critical delamination condition of composite. Anisotropy of the composite, thermos-mechanical deformation and load cases of the tool are taken into consideration. Numerical simulation and punching experiments with accurate uncut plies are conducted to validate the rational of the analytical model. The value of critical thrust force and the effect of drilling temperature on that are obtained from the model. In addition, a thrust force model based on the tool geometry is presented with the feed rate per tooth. According to the proposed model, critical feed rate per tooth for delamination-free drilling with different uncut plies and drill diameters can be obtained

中文翻译：

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CFRP复合材料分层损伤及无分层钻孔方法分析研究

摘要 复合材料钻孔是航空航天领域的一项挑战。在孔出口处经常发生分层，这会降低结构的强度。在这项研究中，为了减少分层，提出了一种具有热效应的分析模型来预测复合材料的临界分层条件。复合材料的各向异性、热机械变形和工具的载荷情况都被考虑在内。使用精确的未切割层进行数值模拟和冲压实验，以验证分析模型的合理性。从模型中得到临界推力值和钻井温度对其的影响。此外，还提供了基于刀具几何形状的推力模型以及每齿进给率。根据提出的模型，