Smart cure cycles for fiber metal laminates using embedded fiber Bragg grating sensors
Smart cure cycles for fiber metal laminates using embedded fiber Bragg grating sensors
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DOI：
10.1016/j.compstruct.2019.01.079
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发表时间：
2019-04-01
影响因子：
6.3
通讯作者：
Sinapius, Michael
中科院分区：
文献类型：
--
作者：
Prussak, Robert;Stefaniak, Daniel;Sinapius, Michael
本文提出了一种带有额外冷却步骤的智能固化循环，用于共固化金属纤维层压板（FML），以减少与工艺相关的热残余应力。利用光纤布拉格光栅（FBG）传感器的在线测量技术，对固化过程中残余应力的形成过程进行了清晰的了解，并确定了最终的残余应力水平。光纤传感器集成在碳纤维增强塑料(CFRP) -钢层压板中。记录的加工应变曲线能够表征金属和cfrp层的力学相互作用。通过引入额外的冷却步骤，各个组件之间的连接力矩受到影响。所进行的实验表明，由此产生的无应力温度显著降低。各种温度循环的修改，如不同的冷却温度，以及修改的冷却和加热速率，进行了研究。通过光纤应变传感器检测这些参数对过程应变和应力的影响。当使用FBG传感器进行监测冷却和再加热时，所开发的固化循环可将焦点试样的热残余应力降低高达23%。
In this paper, a smart cure cycle with an additional cooling step for co-cure bonded fiber metal laminates (FML) is developed to reduce process related thermal residual stresses. An online measuring technique with fiber Bragg grating (FBG) sensors is used to gain a clear understanding of the formation process of residual stresses during cure, as well as to determine the resulting residual stress level. Fiber optic sensors are integrated in carbon fiber reinforced plastic (CFRP) - steel laminates. The recorded processing strain curves enable the characterization of the mechanical interaction of the metal and CFRP-layers. By introducing an additional cooling-step, the moment of the connection between the individual components is being influenced. The conducted experiments show a significant reduction of the resulting stress-free temperature.A variety of temperature cycle modifications, like different cooling temperatures, as well as modified cooling and heating rates, are investigated. The impact of these parameters on the process-induced strains and stresses are detected by the fiber optic strain sensors. The thermal residual stresses are reduced by up to 23% for the specimens in focus, when the developed cure cycles with FBG sensors for a monitored cooling and reheating are used.