碳纳米管增强镁基复合材料强化机制的解析法研究

An Analytical Solution for Strengthening Mechanisms of Carbon Nanotube Reinforced Magnesium Matrix Composites

采用剪切滞后模型理论分析了碳纳米管增强镁基复合材料受载时作用在复合材料上各组分的应力;考虑复合材料各种强化机制,建立碳纳米管增强镁基复合材料的屈服强度模型,研究了各组分性能参数对复合材料屈服强度的影响。结果表明,CNTs的长度对CNTs/Mg复合材料屈服强度的影响有限;碳纳米管层数越多或分散越稀疏越不利于提高复合材料的屈服强度;在一定范围内屈服强度随着温度差的增加而增加;CNTs的体积分数对复合材料屈服强度的影响存在最佳值。这表明该模型预测的复合材料屈服强度与实验结果较吻合。

The stress of respective components in CNTs/Mg composites was examined according to the shearlag model approach. Considering the variety strengthening mechanism, the yield strength model was established to exa- mine the influence of performance parameters of respective component on the yield strength of CNTs/Mg composites. The results show that the influence of the length of CNTs is limited on yield strength of CNTs/Mg composites; the more carbon nanotubes layers and the more sparsely distributed are, the less increase on yield strength of CNTs/Mg composites becomes; the yield strength of CNTs/Mg composites increases with increasing the temperature difference; it exists the optimum of the volume fraction of CNTs on yield strength of CNTs/Mg composites. The values of yield strength of CNTs/Mg composites predicted by the model are well agreed with the experimental values.