摘要
夹层板结构被广泛用于舰船和海洋工程,其结构在复杂弯曲状态下的极限强度能够反映其在面内载荷与面外载荷共同作用下的承载极限,因此,复杂弯曲极限强度对于夹层板结构的安全性能评估越来越重要。通过夹层板结构在初始弯曲状态下的轴向压缩试验和数值模拟,分别得到其载荷位移曲线,并分析该夹层板的极限强度特性。结果表明:在轴向压缩载荷达到极限载荷前,夹层板的轴向位移增长缓慢,一旦超过极限强度,结构的承载能力迅速降低,并伴随着位移的缓慢增长直至夹层板开裂破坏;夹层板的主要破坏模式为蒙皮与芯材分层以及芯材压缩破坏;数值计算结果与试验结果吻合较好,可用于指导夹层板结构设计。
With the wide application of sandwich structure in vessels and off-shore engineering applica-tions, the ultimate strength of the structure in complex bendings reflects the extreme bearing load under in-plane loads and lateral loads, and it becomes increasingly important for the safety assessment of sand-wich structures. In this paper, the load-displacement curve is obtained through experiment and numerical simulation of sandwich plates under axial compressive loads with initial bending, which is the basis in ana-lyzing the characteristic of ultimate strength. It is observed that the axial displacement of sandwich plates under axial compressive loads and lateral loads increases slowly before reaching the limit, but the bearing capacity of the structure decreases rapidly once the load exceeds the ultimate load, with the slow increment of axial displacement until the sandwich plate cracks; the major failure modes are delamination between core and skin and skin compressive fracture;good agreement is achieved between the numerical result and the experimental result, which offers a guide in designing sandwich structures.
出处
《中国舰船研究》
2014年第3期76-82,共7页
Chinese Journal of Ship Research
基金
国家自然科学基金资助项目(51309065)
关键词
夹层板
复杂弯曲
极限强度
试验研究
复合材料
天线罩
sandwich plate
complex bending
ultimate strength
experimental research
composite ma-terial
radome