Abstract A new analytical solution for the prediction of cure-induced spring-in of L-shaped composite parts has been proposed based on modification of the model presented by authors (2017). In the newly proposed analytical solution, the flange length is incorporated into the formulation to theoretically derive the spring-in of corner of L-shaped composite part using shear-lag theory. Consequently, in addition to the cure process generated non-mechanical strain in the rubbery state in the through-thickness and length directions, the new solution can quantitatively give the correlation of spring-in of corner of L-shaped composite part with the flange length. Then, the newly proposed analytical solution is verified by the good agreement between the analytically calculated and experimentally measured spring-in angles for both the unidirectional and cross-ply L-shaped composite parts. Further numerical simulation on the elaborately selected L-shaped composite parts with various configurations also provides a favourable comparison with analytical results, showing the validity of newly proposed analytical solution.

中文翻译：

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L形复合材料零件固化诱发弹入的新解析解

摘要 基于作者 (2017) 提出的模型的修改，提出了一种用于预测 L 形复合材料零件固化引起的弹性变形的新解析解。在新提出的解析解中，将翼缘长度纳入公式，以使用剪切滞后理论从理论上推导出 L 形复合材料零件角部的弹入量。因此，除了固化过程在整个厚度和长度方向上产生橡胶态的非机械应变外，新解决方案还可以定量给出 L 形复合材料零件角部弹入与法兰长度的相关性. 然后，新提出的解析解通过分析计算和实验测量的单向和交叉层 L 形复合材料部件的弹入角之间的良好一致性得到了验证。对精心挑选的各种配置的 L 形复合材料零件的进一步数值模拟也提供了与解析结果的良好比较，显示了新提出的解析解的有效性。