芯材拼接对天线罩夹芯板力学性能的影响

Influence of core splicing on mechanical property of radome sandwich plate

为考查芯材拼接对舰船复合材料天线罩夹芯板力学性能的影响,设计系列试验对比研究芯材拼接对夹芯板的极限承载能力、复杂稳定性和破坏模型的影响.结果发现:芯材拼接主要影响结构的破坏模式和破坏载荷;极限承载试验中芯材拼接易诱发分层破坏,进而导致蒙皮拉伸断裂,且使承载极限降低11.5%;复杂稳定性试验的主要破坏模式为贯穿型和局部型蒙皮压缩破坏,芯材拼接对破坏模式的影响表现为破坏位置的差异,且复杂屈曲载荷降低28.6%;工艺的复杂化使夹芯板力学性能的离散性升高.

In order to investigate the influence of core splicing on mechanical properties of warship composite radome sandwich plate,a series of comparative tests were designed to study its influence on ultimate bearing capacity,complex stability and failure modes of sandwich plate.It is found that core splicing has a great influence on failure modes and failure load of the structure.In the first group of contrastive tests,delamination is apt to be induced on account of core splicing,resulting in skin tensile fracture and 11.5% decrement in ultimate bearing capacity.The main failure modes in complex stability test is penetrative and local skin compressive fracture and the effect of core splicing on failure modes is the difference from the former,which shows the difference of damage position and the decrement of complex buckling load with 28.6%.Beside,the complication of technology makes the discreteness of the mechanical properties of sandwich plate increase.