Hwang Shun-Fa
Department of Mechanical Engineering, National Yunlin University of Science and Technology, 123 University Road, Section 3, Yunlin 64002, Taiwan.
Materials (Basel). 2023 Jul 5;16(13):4844. doi: 10.3390/ma16134844.
After manufacturing, fiber-reinforced polymer composite laminates may have residual stresses, resulting in warpage in flat structures and angle changes in angular sections. These shape distortions may cause fitting mismatch problems under high-level assembly, and extra efforts to fix these problems may be needed. The present paper only makes an overview of the angle deviation of angular composite laminates made of either thermoset matrix with autoclave curing or thermoplastic matrix with thermoforming. Depending on the positive or negative angle deviation, spring-back or spring-in behavior is observed. There are many parameters, including intrinsic and extrinsic parameters, that could affect the angle deviation. In the first part of this review paper, experimental results concerning the effects of the part angle, part thickness, lay-up sequence, corner angle, flange size, tool material, tool surface, and cure cycle are summarized. Spring-in angles are generally obtained in this part. In the second part, several prediction methods, such as simple equations and finite element methods, are compared to indicate the considered parameters. Some have good agreement and some have larger errors. The crucial differences may be dependent on the micromechanical theories and the input properties of the composite and the constituents.
制造后，纤维增强聚合物复合材料层压板可能会产生残余应力，导致扁平结构翘曲和角形截面角度变化。这些形状畸变可能会在高级装配时引起配合不匹配问题，可能需要额外的努力来解决这些问题。本文仅概述了由热压罐固化的热固性基体或热成型的热塑性基体制成的角形复合材料层压板的角度偏差。根据角度偏差的正负，会观察到回弹或弹入行为。有许多参数，包括内在和外在参数，可能会影响角度偏差。在这篇综述文章的第一部分，总结了关于零件角度、零件厚度、铺层顺序、拐角角度、法兰尺寸、工具材料、工具表面和固化周期影响的实验结果。这部分通常得到弹入角度。在第二部分，比较了几种预测方法，如简单方程和有限元方法，以指出所考虑的参数。有些吻合度较好，有些误差较大。关键差异可能取决于微观力学理论以及复合材料和组分的输入特性。
