Multidisciplinary Design of Microvascular Composites Based on a Hierarchical Approach

基于分层方法的微血管复合材料的多学科设计

• 批准号: 1436720
• 负责人: Philippe Geubelle
• 金额: $ 35万
• 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: 2014
• 资助国家: 美国
• 起止时间: 2014-08-15 至 2017-07-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1436720&HistoricalAwards=false
• 关键词: Multidisciplinary; Design; Microvascular; Composites; Based

Inspired by the circulatory systems present in a wide range of living organisms, microvascular composites are a new class of fiber-reinforced polymers that possess a network of embedded microchannels. The focus of this work is placed on circulating a coolant through these microchannels to allow for the use of composite components in high temperature conditions, well beyond their traditional use. The design of these materials naturally leads to a multidisciplinary optimization problem: from a thermal point of view, more efficient active cooling can be achieved by multiplying the number of microchannels in which flows the coolant. But from a structural point of view, every channel represents a small void that may lead to stress concentration and negatively affect the stiffness and strength of the composite. Although the multidisciplinary computational design method to be developed as part of this project focuses on high temperature applications, microvascular composites are being considered for a wide range of multidisciplinary applications, including new electrical, electromagnetic or sensing properties. The combined computational and experimental research project will provide a unique multidisciplinary training experience for two graduate students and one summer undergraduate research assistant.The hierarchical computational design method to be developed in this project will lead to important advances in the efficient and accurate modeling of heterogeneous materials, and in the formulation of a robust gradient-based shape optimization approach that eludes issues associated with mesh distortion often associated with conventional finite element methods. At the heart of the modeling effort is an isogeometric interface-enriched generalized finite element method (IIGFEM) that allows for the thermal and structural modeling of microvascular composites with finite element discretizations that do not conform to the embedded microchannel network and the composite microstructure. The IIGFEM is then combined with a hierarchical, gradient-based shape optimization scheme to compute the optimal shape of the microchannel network based on a set of objective functions and constraints associated with the thermal performance and flow efficiency of the embedded network, and its impact on the structural properties of the microvascular composite. Building on state-of-the-art computational and experimental tools, this top-down design method, which relies on a hierarchy of thermo-mechanical models and length scales, offers an efficient approach to tackle the size and complexity of a design process characterized by multiple, conflicting, multi-disciplinary objective functions and constraints.

微血管复合材料是一种新型的纤维增强聚合物，其灵感来自于广泛存在于生物体内的循环系统，具有嵌入式微通道网络。这项工作的重点是通过这些微通道循环冷却剂，以允许在高温条件下使用复合材料组件，远远超出其传统用途。这些材料的设计自然会导致多学科优化问题：从热的角度来看，通过增加冷却剂流动的微通道数量，可以实现更有效的主动冷却。但从结构的角度来看，每个通道都代表一个小空隙，可能导致应力集中，并对复合材料的刚度和强度产生负面影响。虽然作为该项目的一部分开发的多学科计算设计方法侧重于高温应用，但微血管复合材料正在考虑广泛的多学科应用，包括新的电气，电磁或传感性能。计算与实验相结合的研究项目将为两名研究生和一名暑期本科生研究助理提供独特的多学科培训经验。该项目中开发的分层计算设计方法将导致非均质材料高效准确建模的重要进展，并且在鲁棒的基于梯度的形状优化方法的公式化中，该方法避免了与通常与常规有限元方法相关联的网格失真相关联的问题。在建模工作的核心是一个等几何界面丰富的广义有限元法（IIGFEM），允许与有限元离散不符合嵌入式微通道网络和复合材料的微观结构的微血管复合材料的热和结构建模。然后，将IIGFEM与分层的、基于梯度的形状优化方案相结合，以基于与嵌入式网络的热性能和流动效率相关联的一组目标函数和约束及其对微血管复合材料的结构特性的影响来计算微通道网络的最佳形状。这种自上而下的设计方法建立在最先进的计算和实验工具的基础上，它依赖于热机械模型和长度尺度的层次结构，提供了一种有效的方法来解决设计过程的规模和复杂性，其特点是多个，相互冲突的，多学科的目标函数和约束。