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

这项建议涉及高性能、不连续的工程材料，对介观几何、本构行为和物理性质有严格的要求。*本提议包括：1)进一步发展基于粒子的预测模型，在纤维、纱线、单元单元和织物的尺度上对工业纺织品的几何和本构行为进行模拟；2)用于探测用于检验的工业纺织品的原位红外热像；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。*该提议资助学生开展基础工作，并进一步开发基于粒子的模拟，用于大量工业纺织品和负载情况；通过实验工作验证模拟；开发用于表征由多丝纱线和组件制成的干燥纺织品的红外检测的新用途的知识和模型；以及将预测建模和红外检测相结合，以远程评估现场加载的纺织品结构，重点关注预制件、人造韧带和嫁接、造纸机服装和其他纺织结构。该提案采取了在PI 2010-15年度发现拨款下完成的工作的下一步合乎逻辑的步骤，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，它涵盖了当前项目中没有作为可交付目标的基本工作。这项提案的基本工作将在本提案和未来的项目中得到应用。该提案的特点是项目A、B和C如下。建立了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粒子的、多尺度的干纺织品在各种载荷情况下的几何和本构行为的并行模型。基于物理的建模框架不依赖于经验模型；它的独特之处在于将纱线建模为纤维或纤维簇的集合，而不是连续的，并返回由严格弹性纤维组成的材料的弹性和随时间变化的响应-时间依赖导致纤维的随机重新排列，在模拟中如在实验中一样。*项目B通过实验和建模工作，发展了关于探测干纺织品的强大专业知识，即利用红外热像技术探测具有大量界面和可变纤维间接触的不连续、不同种类和可变形的纤维集合体。文中还探讨了其局限性。这项工作涉及到由PI的团队开发的纺织品导热系数的独特知识。*项目C将项目A的预测建模与项目B的知识联系起来，用于对碳纤维预制件、生物医学纺织品、造纸服装和其他先进纺织品的现场检查。国际纺织品协会一直在从事这些纺织品的活动。**

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.**