Bridging the gap between particle-based multi-scale modelling of the geometry and constitutive behaviour of technical textiles, and in-situ IR probing of their configuration

该提案涉及高性能、不连续的工程材料，这些材料对细观尺度几何形状、本构行为和物理特性有严格要求。该提案包括：1）在纤维、纱线、单胞和织物的尺度上，进一步开发技术纺织品的几何形状和本构行为的预测性颗粒模型; 2）用于探测技术纺织品以进行检查的原位红外热成像; 3）将建模和红外探测应用于复合材料、生物医学纺织品和其他先进纺织品的工程碳纤维预制件。该提案资助学生进行基础工作，运行并进一步开发大量工业纺织品和负载情况的基于粒子的模拟;通过实验工作验证模拟;开发用于表征由复丝纱线和组件制成的干燥纺织品的红外检测新用途的知识和模型;结合预测建模和红外检测，对现场装载的纺织品结构进行远程评估，重点关注预成型件、人工韧带和移植物，造纸机织物和其他纺织结构。该提案从PI的2010 - 15发现补助金下完成的工作中采取了下一个合乎逻辑的步骤，以及正在进行的应用项目产生的新目标。它的独特之处在于涵盖了当前项目中不作为交付目标的基础工作。该提案的基础工作的应用将在本提案和未来的项目中进行访问。该提案的项目A、B和C如下。建立所需的软件和实验基础设施。*项目A应用并进一步开发了基于颗粒的多尺度并行模型，用于模拟干燥纺织品在各种载荷情况下的几何形状和本构行为。基于物理学的建模框架不依赖于经验模型;它在将纱线建模为纤维或纤维簇的集合而不是连续体方面是独一无二的，并且在返回由严格弹性纤维制成的材料的弹性和时间依赖性响应方面是独一无二的-时间依赖性是由纤维在时间上的随机重排引起的，在模拟和实验中。项目B通过实验和建模工作，开发了使用红外热成像技术探测干燥纺织品的强大专业知识，这些纺织品是不连续、异质和可变形的纤维组件，具有众多界面和可变的纤维间接触。同时也探讨了其局限性。这项工作涉及PI团队开发的纺织品导热性的独特知识。*项目C将项目A的预测模型与项目B的知识结合起来，对碳纤维预制件、生物医学纺织品、造纸服装和其他先进纺织品进行现场检查。PI正在开展与这些纺织品有关的活动。**

This proposal concerns high-performance, discontinuous engineered materials subject to stringent requirements on meso-scale geometry, constitutive behaviour and physical properties.***The proposal covers 1) further development of predictive particle-based modelling of the geometry and constitutive behaviour of technical textiles at the scales of fibres, yarns, unit cells and fabrics; 2) in-situ IR thermography used in probing technical textiles for inspection; 3) application of modelling and IR probing to engineered carbon fibre preforms for composites, biomedical textiles and other advanced textiles.***The proposal funds students doing fundamental work running and further developing particle-based simulations for a large array of industrial textiles and load cases; validating the simulations through experimental work; developing knowledge and models for the novel use of IR inspection for characterizing dry textiles made from multi-filament yarns and assemblies; and combining predictive modelling and IR inspection towards remote assessment of textile structures as loaded in the field, focusing on preforms, artificial ligaments and grafts, paper machine clothing and other textile structures. The proposal takes the next logical steps from work done under the PI's 2010-15 Discovery grant, and new objectives arising from ongoing applied projects. It is distinct in covering fundamental work not targeted as deliverable in current projects. Applications of this proposal's fundamental work will be visited in this proposal, and in future projects. The proposal features projects A, B and C as follows. The software and experimental infrastructure required is established.***Project A applies and further develops particle-based, multi-scale concurrent models of the geometry and constitutive behaviour of dry textiles subjected to various load cases. The physics-based modelling framework does not rely on empirical models; it is unique in modelling yarns as assemblies of fibres or clusters of fibres as opposed to continua, and in returning both elastic and time-dependent responses for materials made of strictly elastic fibres - time dependence results from stochastic rearrangement of fibres in time, in simulations as in experiments.***Project B develops robust expertise on the probing of dry textiles as discontinuous, heterogeneous and deformable assemblies of fibres featuring numerous interfaces and variable inter-fibre contacts using IR thermography, through experimental and modelling work. Limitations are also probed. This work relates to unique knowledge of the thermal conductivity of textiles, developed by the PI's team.***Project C connects predictive modelling from project A with knowledge from project B towards field inspection of carbon fibre preforms, biomedical textiles, paper-making clothing and other advanced textiles. The PI has ongoing activity with these textiles.**