拉伸载荷作用下含有裂纹缺陷的碳纳米管增强镁基复合材料应力分布分析

随着纳米电子时代的到来,具有优异性能的碳纳米管成为引起人们广泛关注。镁基复合材料是近年来发展较快的新型高强轻质复合材料。具有优良力学性能,硬度高,耐磨性良好。本文主要运用连续介质力学的理论研究碳纳米管,等效成连续介质里的类桁架结构的薄膜模型,单层石墨卷曲形成封闭的圆柱壳体,以解决碳纳米管增强镁基复合材料力学性能的计算。运用有限元软件ANSYS建立了含有裂纹缺陷复合材料模型,旨在研究裂纹缺陷在拉伸载荷作用下对复合材料的应力分布影响。分别选取无缺陷,镁基(竖向,横向,环向缺陷)模型。发现复合材料在受到拉伸载荷时,镁基(竖向缺陷)模型最易断裂,而镁基(环向缺陷)模型最不易破坏,无缺陷模型最不易屈服,而镁基(横向缺陷)模型最易屈服,且屈服应力最大值主要出现在复合材料交界处。

Stress Distribution of Carbon Nanotubes Reinforced Magnesium Matrix Composites Containing Crack Defects under Tensile Loading

With the advent of the era of nanoelectronics,the unique electrical,optical and mechanical properties of carbon nanotubes as one-dimensional nanomaterials have attracted considerable interest and sparked discussion of their potential use in applications.Because of its good mechanical properties, carbon nanotubes can be used as the reinforcing materials with superior propertiesIn recent years,magnesium matrix composite of new high-strength lightweight composite materials developed rapidly.It has a high electrical and thermal conductivity, high specific strength and specific modulus, excellent damping properties, mechanical properties, high hardness and good wear resistance.In this paper, using the theory of continuum mechanics and ANSYS to solve carbon nanotubes reinforced magnesium matrix composite materials mechanics performance calculation.By using the finite element software ANSYS to contain crack defects of composite model, aims to study crack defects under the action of tensile load effect on the stress distribution of composite materials.The model without defects, magnesium matrix(vertical, transverse and circumferential defects) was selected respectively.Found in composite materials under tensile load, the vertical defects model is the most easy to fracture, and magnesium matrix contains circumferential defects is the most difficult to destroy.The model without defects is the most difficult to yield, while the magnesium matrix contains transverse defects is the easiest to yield, and the maximum yield stress appears at the junction of composite materials