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Recent progress in study of nano-scale fracture mechanism using molecular dynamics simulation and AFM-aided experiment

机译:分子动力学模拟和AFM辅助实验研究纳米尺度断裂机理的最新进展

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After appearance of fracture mechancs (FM), much effort has been devoted to the study of strength evaluation of a cracked body. In particular, application limit of fracture mechanics, i.e., a smallest size of crack to which fracture mechanics can be applied, has widely been discussed. The limit size of crack is in current about submicron meter. Owing to the development of many useful measuring instruments such as scanning electron microscope (SEM), laser microscope, laser interference microscope, ultra sound microscope, atom-force microscope (AFM), scanning tunnelling microscope (STM), scanning probe microscope (SPM) and so on, scale of treating fracture behavior has been lowered past 40 years. Nowdays the fracture behavior is experimentally observed on nano-scale. Simulataneously direct application of molecular dynamics (MD) simulation enables us to examine fracture problem on atomic scale. However, experimental and MD-aided works on nano-scale fracture mechanism do not seem cooperative each other. This is because both methods have no unified mechanics to describe fracture. Concerning nano-scale or atomic scale fracture behavior, both experimental and MD-oriented analyses are reviewed and to which extent the fracture behavior can be explained is discussed in this paper.
机译:出现断裂力学(FM)后,已投入大量精力来研究裂纹体的强度评估。特别地,已经广泛讨论了断裂力学的应用极限,即,可以应用断裂力学的最小裂纹尺寸。裂纹的极限尺寸在当前约亚微米。由于开发了许多有用的测量仪器,例如扫描电子显微镜(SEM),激光显微镜,激光干涉显微镜,超声波显微镜,原子力显微镜(AFM),扫描隧道显微镜(STM)和扫描探针显微镜(SPM)等等,过去40年来,降低骨折行为的治疗规模已经降低。如今,已经在纳米尺度上通过实验观察到了断裂行为。同时直接应用分子动力学(MD)模拟使我们能够在原子尺度上研究断裂问题。但是,关于纳米级断裂机理的实验和医学辅助研究似乎并不相互配合。这是因为两种方法都没有统一的力学机制来描述断裂。关于纳米级或原子级的断裂行为,对实验和面向医学的分析都进行了回顾,并在何种程度上可以解释断裂行为进行了讨论。

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