一种超宽频共形天线结构的力学性能测试

共形天线结构是一种将机载天线集成到飞机复合材料结构中的集承载、维形、隐身及通信功能于一体的多功能结构。本文采用对数螺旋天线作为内植传感器件，设计并制造了一种超宽频共形天线结构，通过面内压缩试验和三点弯曲试验对该型共形天线结构的力学性能进行了考核测试。试验结果表明，超宽频共形天线结构具有更优的力学性能。相对于未植入天线的复合材料夹层结构，超宽频共形天线结构的面内压缩刚度提高了112%，面内压缩强度提高了95%，结构压缩破坏模式由单纯的面芯分离变成了多个胶接界面分离和芯体剪切破坏的复合破坏模式，且强度分散性变大；超宽频共形天线结构面外弯曲刚度提高了26%，面外弯曲强度提高了17%，弯曲破坏模式由上蒙皮与芯体间的大面积面芯分离变成了压头下部局部蒙皮折断和芯体塌陷。

Mechanical Tests on Broadband Conformal Antenna Structure

Conformal antenna structure(CAS), also called the smart skin antenna structure , is a kind of multifunctional structure with the integration of airborne antenn a and a composite sandwich structure. It possesses the functionalities of load- bearing, shape maintaining, stealthy, and communication together. This study is focused on the mechanical tests on a broadband conformal antenna structure with the integ ration of a planar spiral antenna. In-plane compression test and three-point bending test are conducted. According with the test results, the broadband conformal antenna structure has a superior mechanical performance compared with the ordinar y composite sandwich structure. Its compressive stiffness and strength are 112% and 95% higher than the corresponding values of the normal composite sandwich panel, while its bending stiffness and strength increase by 26% and 17%, respectively. The typical failure modes under compression and bending are changed from skin-core debonding only to multiple bonding surface failure combined with local skin fracture and core crushing and fracture.