A Computational/Experimental Multiscale Approach to the Analysis of Structures Containing Mechanical Joints

包含机械接头的结构分析的计算/实验多尺度方法

• 批准号: 0800208
• 负责人: Arif Masud
• 金额: $ 38.63万
• 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: 2008
• 资助国家: 美国
• 起止时间: 2008-05-01 至 2011-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0800208&HistoricalAwards=false
• 关键词: Computational; Experimental; Multiscale; Approach; Analysis

A Computational/Experimental Multiscale Approach to the Analysis of Structures Containing Mechanical JointsMechanical joints are integral to structures, affecting performance and reliability. Joints provide coupling forces and moments between substructures, and introduce localized compliance and dissipation. Aspects of joint dynamics not fully understood include the nature of the slipping process between contacting interfaces, local impacts at mating surfaces away from the connecting elements, sensitivity of response to roughness of mating surfaces, and contaminants and lubricants which introduce uncertainty into the process of response prediction. The proposed research effort includes new developments in scale representation, efficient fine-scale estimation, and interscale coupling. A major contribution of the proposed work will be a systematic spatial decomposition into large and small scales, where the latter are mathematically injected into the calculations for the former. Another will be the representation of the joint interface as a strong discontinuity, leading to interfacial flux terms that provide a natural mechanism for embedding the constitutive laws in a variationally consistent fashion, and novel experiments yielding the required constitutive behavior of the interface. These results will be broadly disseminated, through course materials, conference presentations, and publication in archival journals. Integral with the research effort is a plan for education and outreach, targeting middle school students quickly approaching the age where future career decisions are formed, initially through partnership with Jefferson Middle School in Champaign. Classroom demonstrations and experiments addressing fastener technologies will be developed. Undergraduate and graduate students will be recruited; ideally a broad demographic, for research, to construct demonstrations and experiments, and to mentor middle school students during the school year.

含机械连接结构分析的计算/实验多尺度方法机械连接是结构的组成部分，影响结构的性能和可靠性。 接头在子结构之间提供耦合力和力矩，并引入局部柔度和耗散。 关节动力学的方面没有完全理解，包括接触界面之间的滑动过程的性质，在远离连接元件的配合表面的局部冲击，配合表面的粗糙度的响应的敏感性，和污染物和润滑剂，引入不确定性的响应预测的过程。建议的研究工作包括新的发展规模表示，有效的精细尺度估计，尺度间耦合。 拟议工作的一个主要贡献将是系统的空间分解成大尺度和小尺度，后者在数学上被注入到前者的计算中。另一个将是一个强大的不连续性的联合界面的表示，导致界面通量项，提供了一个自然的机制，嵌入本构关系在变分一致的方式，和新的实验产生所需的本构行为的接口。 这些成果将通过课程材料、会议报告和在档案期刊上发表而广泛传播。 与研究工作不可分割的是一个教育和推广计划，针对中学生迅速接近未来职业决定形成的年龄，最初通过与尚潘杰斐逊中学合作。 将开发针对紧固件技术的课堂演示和实验。 本科生和研究生将被招募;理想情况下，一个广泛的人口，研究，建立示范和实验，并在学年指导中学生。