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GOALI: Design of Rheologically-Complex Soft Materials

目标：复杂流变软材料的设计

基本信息

批准号：
1463203
负责人：
Randy Ewoldt
金额：
$ 45万
依托单位：
University of Illinois at Urbana-Champaign
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2015
资助国家：
美国
起止时间：
2015-06-01 至 2021-05-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1463203&HistoricalAwards=false
关键词：
GOALI Design Rheologically Complex Soft

项目摘要

Many everyday materials do not fit classical definitions of fluid and solid. Instead, rheological materials can have properties of both states. While engineers typically use traditional fluid and solid materials to achieve desired functionality of engineering systems, there is great opportunity for novel performance based on rheological material behavior. The focus of this Grant Opportunity for Academic Liaison with Industry (GOALI) Program research project is to ask the question, given a desired performance, what rheological material behavior is needed, and what material formulations achieve this behavior? The work here will study design and optimization techniques for these complex soft materials. The research involves theory, computation, and experiment. The methodology aims to transform the search for novel rheologically-complex materials and their use in engineering design. The resulting enhanced system performance would impact numerous application domains such as, but are not limited to, soft robotics, vibration control, fire-suppression systems, and prosthetics. The GOALI partnership will strengthen the relevance of the new methods to engineering practice and provide a test bed for the new design approach. The interaction with industry will also enhance the training of students. Associated outreach activities will broaden the general understanding of rheological materials via the development and use of a portal enabling virtual experiments on rheological materials.The objective of this work is to create a new paradigm for creative and rational design of rheologically-complex materials. This project?s approach directly connects system-level performance optimization to material-level design. A core challenge is that rheological properties are functions, not constants. The work will define and organize design-appropriate mathematical modeling methods that use descriptive material functions (function-valued properties) directly. Rheological complexity derives from time-dependent (viscoelastic) and amplitude-dependent (nonlinear) behavior, and this two-dimensional space will be used to organize the applicability and limitations of different constitutive models for the purpose of design. Optimization methods for the resulting mathematical structures will be established. A key challenge is the optimization of functions, such as kernel functions in convolution integrals. This will be approached with numerical optimal control methods including direct transcription. Once target properties are identified, experiments will be used to demonstrate rational design of rheologically-complex material compositions that best achieve the system performance objectives. This material-level design will leverage known structure-rheology models by considering multiple material strategies including polymeric systems, colloidal systems, and composite combinations. The industry GOALI partner will work closely with the academic team to help translate the work to industry, provide insight on formulation of new material concepts, and provide relevant material formulations. The methodology will be tested numerically and experimentally with case studies of shear-thinning and linear viscoelastic systems. The new paradigm will lay the foundation for additional integrated design approaches for other materials domains with complex function-valued properties.

许多日常材料不符合流体和固体的经典定义。相反，流变材料可以具有两种状态的性质。虽然工程师通常使用传统的流体和固体材料来实现工程系统的所需功能，但基于流变材料行为的新性能有很大的机会。这个资助机会与工业学术联络（GOALI）计划研究项目的重点是问这个问题，给定一个理想的性能，需要什么流变材料的行为，什么材料配方实现这种行为？本文将研究这些复杂软材料的设计和优化技术。研究涉及理论、计算和实验。该方法旨在改变对新型流变复杂材料的研究及其在工程设计中的应用。由此产生的增强的系统性能将影响许多应用领域，例如但不限于软机器人，振动控制，灭火系统和假肢。 GOALI伙伴关系将加强新方法与工程实践的相关性，并为新的设计方法提供试验平台。与工业界的互动也将加强对学生的培训。相关的推广活动将通过开发和使用一个能够对流变材料进行虚拟实验的门户网站来拓宽对流变材料的一般理解。这项工作的目标是为流变复杂材料的创造性和合理设计创造一个新的范例。这个项目？的方法直接将系统级性能优化与材料级设计联系起来。一个核心挑战是流变特性是函数，而不是常数。这项工作将定义和组织设计适当的数学建模方法，直接使用描述性的材料功能（功能值属性）。流变复杂性源于时间依赖性（粘弹性）和振幅依赖性（非线性）行为，并且该二维空间将用于组织不同本构模型的适用性和限制，以用于设计目的。将建立由此产生的数学结构的优化方法。一个关键的挑战是函数的优化，例如卷积积分中的核函数。这将接近与数字最优控制方法，包括直接转录。一旦确定了目标特性，将使用实验来证明流变复杂材料组合物的合理设计，以最好地实现系统性能目标。这种材料级设计将通过考虑多种材料策略（包括聚合物系统、胶体系统和复合材料组合）来利用已知的结构流变学模型。行业GOALI合作伙伴将与学术团队密切合作，帮助将工作转化为行业，提供新材料概念制定的见解，并提供相关的材料配方。该方法将测试数值和实验的剪切稀化和线性粘弹性系统的案例研究。新的范例将为其他具有复杂功能值属性的材料领域的其他集成设计方法奠定基础。