US-Turkey Cooperative Research: Transfer of Energy from High-Frequency to Low-Frequency Modes in Structures

产品描述：该奖项是为了支持弗吉尼亚理工学院和弗吉尼亚州布莱克斯堡州立大学工程教授Ali Nayfeh博士和土耳其伊斯坦布尔Bogazici大学机械工程助理教授Gunay Anlas博士的合作项目。 本研究的主要目的是了解层合方案对复合材料层合板在动态载荷下的行为的影响，以及负责从高到低的频率模式的能量转移的机制。 不同的复合材料系统具有以不同的、规定的方向彼此叠置的层压件。 这种方向上的差异改变了层压板的性能。 在多自由度系统中，从高频模式到低频模式的能量交换可能是内部共振和宽间隔模式之间相互作用的组合的结果。 在这个项目中，计划进行理论和实验研究。 将在VPI SU建造和测试具有各种厚度和铺层的复合板。 该系统的理论研究将在Bogazici U进行。在伊斯坦布尔。 交流访问将使研究人员能够更好地将实验数据与对这些材料行为的理解联系起来。 范围：该项目将涉及一位在VPI SU分析和实验力学方面具有丰富经验的成熟科学家，以及一位在同一领域具有分析能力的年轻土耳其科学家，他特别熟悉这类材料的行为，即层压复合材料。 VPI SU的设施和研究生与Anlas博士的分析技能以及Bogazici大学的学生和计算设施的支持相结合，对实现该项目的既定目标特别有用。 这位美国科学家目前正在NSF土木和机械系统部门（CMS）的资助下在这一领域进行广泛的研究，这一国际组成部分应该会增加美国团队和土耳其方面的利益。 复合材料的使用在许多行业中迅速增长，包括航空航天工业和其他不那么奇特的行业。 这项研究的结果将有助于设计人员选择复合材料，将满足所需的标准，强度和耐疲劳性。 预计来自美国和土耳其的研究生将参与该项目。 该项目非常符合国际方案司的目标。

Description: This award is for support of a cooperative project by Dr. Ali Nayfeh, Professor of Engineering at Virginia Polytechnic Institute and State University, Blacksburg, VA, and Dr. Gunay Anlas, Assistant Professor of Mechanical Engineering at Bogazici University in Istanbul, Turkey. The main objective of this research is to understand the effect of the lamination scheme on the behavior of laminated composite plates under dynamic loads, and the mechanism responsible for the transfer of energy from high-to-low frequency modes. Different composite systems have laminates that are laid on top of each other with different, prescribed, orientation. That difference in orientation alters the properties of the laminate. Energy exchanges in multi-degree-of-freedom systems, from high-to-low frequency modes can be the result of combinations of internal resonances and the interaction between widely-spaced modes. In this project both theoretical and experimental studies are planned. Composite plates with various thickness and lay-ups will be built and tested at VPI&SU. Theoretical studies of the systems will be carried out at Bogazici U. in Istanbul. Exchanges of visits will enable the researchers to better correlate the experimental data to the understanding of the behavior of these materials. Scope: This project will involve an established scientist, with extensive experience in both analytical and experimental mechanics at VPI&SU, with a young Turkish scientist who has demonstrated analytical capability in the same field, and who is particularly familiar with the behavior of that class of materials, namely laminated composites. The combination of facilities and graduate students at VPI&SU with the analytical skills of Dr. Anlas and the support of students and computing facilities at Bogazici University is particularly useful in accomplishing the stated objectives of this project. The American scientist is currently conducting extensive research in this area under a grant from NSF's Division of Civil and Mechanical Systems (CMS), and this international component should enhance the benefit to the US team as well as to the Turkish side. The use of composite materials is growing rapidly in many industries, including the aerospace industry and other, less exotic, industries. The results of this research should help designers select composites that will meet the required criteria for strengths and fatigue resistance. Graduate students from the US and from Turkey are expected to participate in the project. The project fits well with the objectives of the Division of International Programs.