Design of Structural Left-handed Material based on Topology Optimization

An effective method to design structural Left-handed material(LHM) was proposed. A commercial finite element software HFSS and S-parameter retrieval method were used to determine the effective constitutive parameters of the metamaterials, and topology optimization technique was introduced to design the microstructure configurations of the materials with desired electromagnetic characteristics. The material considered was a periodic array of dielectric substrates attached with metal film pieces. By controlli...     

振动红外热像法在层合梁无损检测中的应用

脱层是层合材料最主要的破坏形式之一。利用振动红外热像法的理论研究有脱层的层合梁，对层合梁施加低幅值、高频率的振动激励，当激励频率达到脱层区域的自然频率时，脱层区域将会发生共振响应，产生高于未脱层区域的热模态，从而显示脱层的位置。分析了激励频率对温度梯度形成的影响，并计算了该层合梁在激励一段时间后的温度分布趋势，对层合材料的无损检测有一定的参考意义。     

超材料在隐身领域的研究及应用进展

鉴于超材料所表现出的自然界中不存在的新颖特性,其在航空航天隐身领域的重要作用已经得到了体现。介绍了基于超材料的隐身新理念,并对超材料在隐身领域中的应用进行了概述。最后,展望了新型超材料在隐身领域的应用前景。