利用有限元方法分析了珍珠层裂纹的微观应力场，比较珍珠层最小结构单元在不同边长和厚度下的J积分。结果表明：珍珠层裂纹尖端应力集中小，分布范围广；天然结构参数下，珍珠层J积分最大。珍珠层最小结构单元有可能存在最优形状比，使材料达到强度与韧性的最佳配合，从而有可能用低强度的材料通过合适的大小和宽厚比、合适的制备方法得到性能优异的层状复合材料。
The distribution of stress and strain around the tip of crack in nacreous layer was analyzed based on finite element method;J integrations of nacreous layer with different length and thickness elements were compared. It indicates that the concentration of stress around the tip of crack is widely distributed. The J integration of the natural scaled elements exhibits the maximum value. Therefore,the microstructure element of nacreous layer is likely to have optimal shape,which leads to the optimal toughness as well as high strength. So it is possible to prepare multilayered composites of high mechanical property with low strength material through optimal method and microstructure element.
参考文献
| [1] | 侯东芳,周根树,郑茂盛.贝壳珍珠层层间断口及死亡期的XPS研究[J].材料科学与工程学报,2004(06):838-841. |
| [2] | D. R. Katti;K. S. Katti;J. M. Sopp;M. Sarikaya .3D finite element modeling of mechanical response in nacre-based hybrid nanocomposites[J].Computational & theoretical polymer science,2001(5):397-404. |
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