摘要
研究了碳纤维X-cor销钉增强泡沫夹层结构的常规力学性能。自行设计工艺,制造了X-cor增强泡沫夹层结构复合材料,并进行了多种材料/几何参数下的平压、三点弯曲和芯子剪切试验,得到了系列试验数据,并观察记录了较全面的结构破坏模式;倾斜的X-cor销钉对夹层结构性能的增强效果大大优于垂直销钉的增强效果,倾斜X-cor增强泡沫夹层结构的抗弯刚度和破坏载荷大幅提高;X-cor增强泡沫夹层结构在弯曲载荷下具有较强的二次承载能力;X-cor增强泡沫夹层结构在弯曲和剪切载荷下均呈现明显的渐进失效过程,在初始裂纹出现后,直到最终破坏发生还有较长的损伤扩展过程,这一过程是增强相限制芯材裂纹大规模扩展的结果,表明X-cor增强泡沫夹层结构在初始裂纹出现后还具有较强的持续承载能力。
The mechanical properties of X-cor （carbon fiber pins） reinforced foam core sandwich specimens are studied with a flat compress,core shear and three-point bending test. The fabrication process of the X-cor reinforced foam core sandwich is also presented. Testing results indicate that stiffness and failure load of X-cor reinforced foam core sandwich are much enhanced. The post load-bearing capability is found in the three-point bending and core shear test after initial crack,and a progressive failure process of the specimens is observed. Catastrophic damage occurres a long time after the initial crack appeares. Two mechanisms cause the progressive failure：the X-cor suppresses crack growth in the foam,and the face sheet is stiffened by the fiber pins in bending load.
出处
《航空学报》
EI
CAS
CSCD
北大核心
2008年第6期1542-1549,共8页
Acta Aeronautica et Astronautica Sinica
基金
国家自然科学基金(10572116)
关键词
X-cor增强
泡沫夹层结构
破坏模式
力学性能
渐进失效
X-cor reinforcement
foam core sandwich
failure process
mechanical property
progressive failure
