Functionally Graded Materials Micro-Tailored to Design Objectives

摘要本研究提出了一种新的设计范式，即聚合物复合材料可以局部微定制以满足设计目标。在外加电场作用下，可以固化具有随机悬浮的微或纳米级夹杂物的液态聚合物，从而产生具有排列微观结构的固体复合材料。局部结构的内含物使人们能够(a)减少不连续处的应力集中，(b)控制湿热和残余应力，以及(c)提供自感知和智能材料能力。这个为期三年的项目的主要研究目标是通过修改复合材料微观结构来减小不连续处的应力梯度来证实新设计方法的可行性。选取单孔或多孔拉伸板作为研究实例。个人研究活动包括工艺要求评估、材料测试和设计优化预测建模。这项研究将与威斯康星大学麦迪逊分校针对学生和广大社区的教育使命相结合。研究结果将用于各种教育和推广活动，并与威斯康星大学麦迪逊分校聚合物工程中心和美国国家科学基金会I/UCRC中心协调。

AbstractThe proposed research advances the novel design paradigm that polymericcomposites can be locally micro-tailored to meet design objectives. A liquid polymer having randomly suspended micro- or nano-sized inclusions can be cured in the presence of applied electric field to produce solid composite with aligned microstructure. Locally structured inclusions enable one to (a) reduce stress concentrations at discontinuities, (b) control hygrothermal and residual stresses, and (c) provide self-sensing and smart material capabilities. The major research objective of this three-year project is to substantiate feasibility of the novel design approach by modifying composite microstructure to reduce stress gradients at discontinuities. A tensile plate perforated with a single hole or multiple holes is chosen as the study example. Individual research activities include evaluation of process requirements, material testing and predictive modeling for design optimization. This research will be integrated with the educational missions of University of Wisconsin, Madison which target student and community-at-large. The results will be utilized in various educational and outreach activities and coordinated with the UW-Madison Polymer Engineering and the NSF I/UCRC Centers.