摘要
结合有限元的分析方法,建立了一个简化模型来模拟纳米碳管增强镁基复合材料在拉伸试验过程中的变形,研究了基体、增强体的应变和应力分布,以及界面对复合材料力学行为的影响,探讨了纳米碳管增强体与基体间的应力传递机制和断裂机理。模拟结果表明,纳米碳管整体上受力比较均匀,在轴向上的界面处出现应力集中;基体与纳米碳管在两端面的接触部位出现明显的应力集中,应力分布呈火焰状,中心大,逐渐向外围减小,在基体的其余部位应力大小则是相对均匀的,这说明复合材料的破坏是从界面处开始的,其破坏机制是界面脱开。
Deformation behavior of carbon nano-tubes reinforced magnesium matrix composites was simulated by a simplified model based on the FEM(finite element method)to understand the strain and stress distribution in the matrix and reinforcement as well as effects of interface on mechanical properties of the composites,and stress transferring and fracture mechanism of carbon nao-tubes with the magnesium matrix alloy were expounded.The results reveal that the whole carbon nano-tube exhibits homogeneous stress distribution,however,the stress aggregation occurs in interface at axial direction to some extent.Remarkable stress aggregation can be observed in the contacted location of two-end face of matrix with carbon nao-tubes,where stress distribution exhibits flamboyance,decreasing from the center to the outer,while the stress distribution in the other location of the matrix alloy is very homogeneous.The fracture of the composites begins at the interface,and the fracture mechanism is characterized by interfacial debonding,which is accordant with the experimental ones.
出处
《特种铸造及有色合金》
CAS
CSCD
北大核心
2010年第3期200-202,共3页
Special Casting & Nonferrous Alloys
基金
武汉市晨光计划资助项目(20015005030)
湖北省自然科学基金资助项目(2004A13A108)
关键词
纳米碳管
镁基复合材料
有限元
Carbon Nano-tubes,Magnesium Matrix Composites,Finite Element Method
