Circularity of thermoplastic ComposIte wound stRuCtUres through innovative materiaL design, peeling-based disAssembly and Re-winding

热塑性复合材料缠绕使得能够制造特别适合于运输部门的轻质罐。然而，由嵌入聚合物基质中的连续纤维制成的有价值的带制成的这些结构的经典再循环而不降级循环是主要的技术和经济挑战。为了保持复合材料的价值，使用结束处理应保持纤维的连续性，以最大限度地提高机械性能，并保持纤维嵌入基体中，以简化重复使用。最近的实验结果表明，剥离为基础的拆卸，以达到这些目标的能力，并强调了层间性能的决定性作用，对回收材料的质量。在这些成果的基础上，Circular²项目的目标是通过创新的材料设计、基于剥离的拆卸和使用可重复使用的整体设计方法的胶带再处理，实现热塑性复合材料缠绕结构的材料圆形化。本研究将探讨两种创新的设计策略：（A）材料聚焦设计，包括调整胶带表面，以在专用的热机械载荷下诱导所需的界面特性;（B）结构聚焦缠绕设计，包括避免剥离-相邻层的不利纤维嵌套;（II）在低温或高剥离速率下剥离以引起层与层界面的脆化。剥离的胶带将在缠绕过程中重复使用。将在胶带材料制造、剥离和重复使用后确定机械性能。将开发一个多物理场和多尺度模拟工具，以模拟不同过程中所涉及的机制。最后，将比较所调查的战略的环境足迹。

Thermoplastic composite winding enables the manufacturing of lightweight tanks particularly suited for the transportation sector. Nevertheless, a classical recycling without downcycling of these structures made of valuable tapes made of continuous fibers embedded in a polymeric matrix is a major technical and economical challenge. In order to retain the value of the composite, the end-of-usage processing should preserve the continuity of the fibers to maximize the mechanical properties and maintain the fibers embedded in the matrix to simplify reuse. Recent experimental results have demonstrated the ability of peeling-based disassembly to reach these goals and have highlighted the decisive role of the interlaminar properties on the quality of the recovered material. Building on these results, the aim of the project Circular² is to enable material circularity of thermoplastic composite wound structures through innovative material design, peeling-based disassembly and tape reprocessing using a holistic design for reuse approach. Two innovative design strategies will be investigated: (A) material-focused design consisting in tuning the tape surface to induce the desired interface properties under dedicated thermo-mechanical loading; (B) structure-focusedwinding design consisting in avoiding peeling-disadvantageous fiber nesting of adjacent layers; in combination with two innovative disassembly strategies: (I) ultrasonic assistedpeeling; (II) peeling at low temperature or high peeling rate to induce an embrittlement of the layer to layer interface. Peeled tapes will be reused in a winding process. Themechanical performance will be determined after manufacturing, peeling and reuse of the tape material. A multi-physics and multi-scale simulation tool will be developed to model the mechanisms involved during the different processes. Finally, the environmental footprint of the investigated strategies will be compared.