Thermomechanical Analysis of Thermoplastic Mono-Material Sandwich Structures with Honeycomb Core

IF 3 Q2 MATERIALS SCIENCE, COMPOSITES Journal of Composites Science Pub Date : 2024-01-07 DOI:10.3390/jcs8010018
T. Latsuzbaya, Peter Middendorf, D. Voelkle, Christoph Weber
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Abstract

The application of fiber-reinforced thermoplastic mono-material sandwich panels has many advantages, such as recyclability, reduction in processing cycle times, integration of additional elements by means of welding, and a great potential for in-line production. The most efficient way to produce a curved thermoplastic sandwich panel is thermoforming, which has several challenges. One of them is to achieve a higher thermal gradient in the panel. On the one hand, the temperature at the skin–core interface must exceed the softening point of the polymer to reach a sufficient bonding degree. On the other hand, the core should not be overheated and overloaded to avoid its collapse. Furthermore, several fiber distortions, such as wrinkles or buckles, can be developed during thermoforming. All these flaws have a negative impact on the mechanical performance of the sandwich structure. The objective of this study is the development of a simulation tool for the thermoforming process, which can replace the time-consuming trial-and-error-based method. Therefore, a coupled thermomechanical model was developed for a novel thermoplastic sandwich structure, which is able to predict the temperature distribution and its influence on the mechanical properties of the panel. Experimental trials were conducted to validate the thermomechanical forming model, which demonstrated a good agreement with numerical results.
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带蜂窝芯的热塑性单一材料三明治结构的热力学分析
纤维增强热塑性单一材料夹芯板的应用具有许多优点,例如可回收利用、缩短加工周期、通过焊接集成附加元件以及在线生产的巨大潜力。生产弧形热塑性夹芯板的最有效方法是热成型,但这种方法也面临一些挑战。其中之一就是要在板材中实现较高的热梯度。一方面,表皮-夹芯界面的温度必须超过聚合物的软化点,以达到足够的粘合度。另一方面,芯材不应过热和过载,以避免其崩溃。此外,在热成型过程中还会产生一些纤维变形,如皱褶或扣环。所有这些缺陷都会对夹层结构的机械性能产生负面影响。本研究的目的是为热成型过程开发一种模拟工具,以取代耗时的试错法。因此,针对新型热塑性夹层结构开发了一个热力学耦合模型,该模型能够预测温度分布及其对板材机械性能的影响。实验验证了热力学成型模型,结果表明该模型与数值结果非常吻合。
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来源期刊
Journal of Composites Science
Journal of Composites Science MATERIALS SCIENCE, COMPOSITES-
CiteScore
5.00
自引率
9.10%
发文量
328
审稿时长
11 weeks
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