Experimental, Theoretical and Computational Study of Compressed Thin Films Diaphragms

压缩薄膜隔膜的实验、理论和计算研究罗格斯大学机械与航空航天工程系salberto M. Cuitino和Gustavo Gioia计划进行实验、理论和计算研究，以研究各向异性压缩薄膜隔膜的力学。实验结果表明，各向异性压缩隔膜的行为与各向同性压缩隔膜的行为有着根本的不同。因此，在各向同性情况下获得的表现良好的折叠模式，各向异性情况导致微观结构，即缺乏与边界条件相关的长度尺度的精细折叠模式。这些微观结构是潜在能量学的spinodalstructure的症状。实验工作将产生关于发生折叠微观结构的应力状态范围的定量信息，微观结构构型对应力状态历史和膜片尺寸等因素的依赖，以及弯曲对折叠细化的正则化效应。理论工作将允许确定适当的能量功能，表征相关的最小化序列，并开发具有适合特定用途的折叠模式的工程隔膜的能力。将开发计算工具，以便与理论结果进行详细比较，并用于无法进行理论处理的实际情况。

Experimental, Theoretical, and Computational Study of CompressedThin-Film DiaphragmsAlberto M. Cuitino and Gustavo Gioia Department of Mechanical & Aerospace Engineering Rutgers University Piscataway, NJ 08854-8058Experimental, theoretical, and computational research is planned tostudy the mechanics of anisotropically compressed thin film diaphragms.The project is motivated by experimental results which indicate thatthe behavior of anisotropically compressed diaphragms is fundamentally different from that of isotropically compressed ones. Thus, in lieu ofthe well-behaved folding patterns which obtain in the isotropic case,the anisotropic case leads to microstructures, i.e. fine foldingpatterns which lack a length scale associated with the boundaryconditions. These microstructures are symptomatic of the spinodalstructure of the underlying energetics.Experimental work will yield quantitative information on the range ofstress states for which folding microstructures occur, the dependence ofmicrostructure configurations on such factors as stress state historyand diaphragm size, and the regularizing effect of bending on foldingrefinement. The theoretical work will allow to determine the appropriateenergy functionals, characterize the associated minimizing sequences,and develop the capability to engineer diaphragms with folding patternssuited to specific purposes. Computational tools will be developed fordetailed comparison with theoretical results, and for use in practicalcases which are not amenable to theoretical treatment.