题目：Strain Development During Cure of Partially Pre-Cured Thermosetting Composites Measured With Distributed Fiber Optic Sensors
（利用分布式光纤传感器测量部分预固化热固性复合材料固化过程中的应变变化）
作者：Francesco Taddei | Giacomo Struzziero | Valentin Ott | Véronique Michaud
期刊名：Polymer Composites
影响因子：4.9
DOI：10.1002/pc.70613
收录年份：2025
摘要：检测热固性复合材料的制造缺陷，对保障构件质量、使用安全以及提升制造效率至关重要。固化及冷却过程产生的残余应力往往会引发基体微裂纹与几何变形，不仅会损害构件力学性能，还会造成几何尺寸不达标。在铺层之前对材料进行部分预固化处理，可使部分放热反应在复合材料铺叠完成之前完成，因此有望缓解热致缺陷。为验证该思路，本文开展了部分预固化树脂及复合材料试样的固化过程应变测试，并同步完成最终翘曲变形测试。试验选用分布式光纤传感器，可实现高空间分辨率的应变与温度监测。研究发现：对于薄层碳纤维增强树脂基复合材料（CFRP）层合板，将预固化度提升至 50%，残余应变可最高降低 31%，翘曲变形最高降低 14%。进一步测试表明，厚层合板固化过程中会出现显著温度超调，并且产生更大的纵向残余应变；若先将铺层预固化至 28% 的转化率，可分别使温度超调量降低 29%、内部残余应变降低 17%。
Abstract: Detection of manufacturing‑induced defects in thermosetting composites is crucial to guarantee part quality, safety, and improve manufacturing efficiency. Residual stresses from cure and cool‑down often lead to matrix microcracking and geometrical distortion, with potential detrimental effects on mechanical performance and non‑fulfillment of geometrical requirements. Partial pre‑cure of the material prior to layup allows part of the exothermic reaction to exhaust before stacking the composite; thus, it can potentially mitigate thermally induced defects. To investigate such possibility, strain measurement experiments during cure of partially pre‑cured resin and composite samples were carried out, together with final warpage measurements. Distributed fiber optic sensors were selected, which allow strain and temperature measurement with high spatial resolution. Increasing pre‑cure level up to 50% in thin CFRP laminates was found to reduce the amount of residual strain and warpage generated by up to 31% and 14%. Further measurements showed that a strong temperature overshoot and higher longitudinal residual strain were generated during cure of thicker laminates. Thermal overshoot and internal strain were reduced by 29% and 17%, respectively, by initially pre‑curing the plies to 28% conversion.
关键词：固化动力学；分布式光纤传感器；聚合物基复合材料；残余应力；应变；温度
实验装置与传感器集成工艺示意图
依次通过 DSC、流变、DMTA 等手段完成材料基础本征参数表征，得到不同预固化度下树脂的力学及热性能演化规律，同时开展分布式光纤传感的方法验证，进一步利用埋入式光纤获取试样沿长度方向的信号分布以及完整固化周期内的内部应变发展历程，揭示凝胶后化学收缩、冷却过程共同形成残余应变的变化特征，也反映出构件内部应变存在空间离散性。
通过分布式光纤监测薄、厚 CFRP 层合板固化应变与翘曲变形，证实预固化工艺可抑制热超调并降低残余应变与翘曲，但其改善效果会受构件厚度影响。
