玻璃纤维/环氧树脂基夹芯材料侧压性能数值模拟

Numerical simulation of side compressive properties on glass fiber/epoxy resin sandwich composite

为分析材料在侧压载荷下的失效机制及破坏模式,采用有限元软件ANSYS,建立了材料的细观结构模型,并进行侧压性能的数值模拟,探讨了材料在3 mm侧压位移载荷作用下复合材料、纤维和树脂基体的应力、应变分布情况。结果表明:玻璃纤维/环氧树脂基夹芯材料在侧压载荷作用下,从宏观角度分析发现,上下面板应力最大,最易发生压缩破坏;芯材应力最小,最不易被破坏;2排芯材间的面板最易发生失稳破坏,这是导致材料失效的最主要原因。从微观角度分析发现,纤维起主要承载作用,树脂起次要作用,当侧压位移载荷达到3 mm时,材料的破坏模式主要为树脂破裂、纤维与树脂严重脱黏等。

In order to reveal failure mechanism and failure mode of glass fiber/ epoxy resin sandwich composite under side compressive load, a meso-structural model was built by using the finite element software ANSYS, and numerical simulation of side compressive properties on the composite was analyzed emphasisly. The stress and strain distribution of the composite, fibers and resin was discussed under side compressive loads of 3 mm displacement by using the meso-structural model. The results show that when the composite is subjected to side compressive load, the maximum value of stress occurs on the upper and lower face-sheet macroscopically, where the composite is damaged easily. The minimum value of stress occurs on the piles, where the composite is hard to be damaged. Unstable failure easily occurs on the face-sheet between two rows piles, which is the main failure cause of the composite. The fibers play a major role in bearing, and the resin plays a minor role microscopically. The failure mode is the resin fracture, and the interfacial de-bonding between fibers and resin when the composite is loaded with 3 mm displacement compression.