Analysis, Manufacturing, and Mechanical Testing of Stitched Sandwich Composites

缝合夹层复合材料的分析、制造和力学测试摘要来自犹他大学和佐治亚理工学院的团队将对泡沫芯层中有贯穿厚度增强的缝合夹层复合材料的基本力学行为进行综合的分析、制造和实验研究。拟议的研究计划将加强对力学和损伤响应的知识和理解，包括蠕变和其他随时间变化的行为。为此，提出了三个主要领域的研究：制造：将研究在各种多轴载荷下的夹层结构非常规缝合概念的发展，包括双轴和纯层间剪切。将通过优化穿孔缝合夹层结构的特性来研究缝合以增强压缩性能。分析和计算：将开发多尺度细观力学和结构模型来模拟缝合夹层复合材料的力学行为，重点关注短期和长期的时间相关响应。将使用不同的有限元结构建模方法，使用壳、连续介质和粘结断裂单元来模拟材料和结构的响应，包括时间依赖和损伤增长。实验：将开发和执行标准和非标准测试程序来检查缝合夹层复合材料和结构组件在力学和环境条件下的力学行为。三家PI与他们的研究生和本科生之间拟议的大学间合作最终将促进和加强双方的研究和教育基础设施。佐治亚理工学院的综合教育和研究中心CERC将是拟议活动的一部分。它的学生和其他教职员工将从增强其在夹层复合材料领域的能力中受益匪浅。来自代表性不足群体的本科生和研究生将成为这一新研究项目的一部分。作者计划为汽车、航空航天和民用基础设施领域的执业工程师举办关于使用三明治复合材料的会议和夏季研讨会。在这项研究的基础上，关于夹层复合材料的教育活动将整合到本科生和研究生的两门复合材料课程中。该网络还将用于制作夹层复合材料设计的教育模块。

Analysis, Manufacturing, and Mechanical Testing ofStitched Sandwich CompositesAbstractThe team from the University of Utah and Georgia Tech will conduct an integrated analytical, manufacturing, and experimental investigation of the fundamental mechanical behavior of stitched sandwich composites with through-thickness reinforcement in their foam core. The proposed research program will enhance the knowledge and understanding of the mechanical and damage responses including creep and other time-dependent behavior. To that end, research is proposed in three major areas:Manufacturing: Development of non-normal stitching concepts for sandwich structures will be investigated under a variety of multi-axial loadings, including bi-axial and pure interlaminar shear. Stitching for enhanced compression behavior will be investigated by optimizing the characteristics of perforated stitched sandwich structures.Analytical and Computational: Multi-scale micromechanical and structural models will be developed to simulate the mechanical behavior of stitched sandwich composites with emphasis on both short-term and long-term time-dependent responses. Different finite-element structural modeling approaches, using shell, continuum, and cohesive fracture elements, will be used to simulate the material and structural responses including time-dependent and damage growth.Experimental: Standard and non-standard test procedures will be developed and performed to examine the mechanical behavior of stitched sandwich composites and structural components under combined mechanical and environmental conditions.The proposed inter-university collaboration between the three PIs and their graduate and undergraduate students will ultimately promote and enhance the research and educational infrastructure at both sides. The composite education and research center CERC at Georgia Tech will be part of the proposed activity. Its students and other faculty will tremendously benefit from enhancing its capability in the area of sandwich composites. Undergraduate and graduate students from underrepresented groups will be part of this new research project. The authors are planning to host conference sessions and a summer workshop on using sandwich composites for practicing engineers in the areas of automotive, aerospace and civil infrastructure. The educational activity on sandwich composites, based on this research, will be integrated in two composite courses at the undergraduate and graduate levels. The web will be also used to produce an educational module for design of sandwich composites.