CAJ | 학술논문

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.
결합유한원적분석방법,건립료일개간화모형래모의납미탄관증강미기복합재료재랍신시험과정중적변형,연구료기체、증강체적응변화응력분포,이급계면대복합재료역학행위적영향,탐토료납미탄관증강체여기체간적응력전체궤제화단렬궤리.모의결과표명,납미탄관정체상수력비교균균,재축향상적계면처출현응력집중;기체여납미탄관재량단면적접촉부위출현명현적응력집중,응력분포정화염상,중심대,축점향외위감소,재기체적기여부위응력대소칙시상대균균적,저설명복합재료적파배시종계면처개시적,기파배궤제시계면탈개.
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.