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MD simulation for nanocrystals   总被引:6,自引:0,他引:6  
Molecular dynamic (MD) provided anab initio simulation for nano-scale mechanical behavior of materials, provided that the inter-atomic potential is accurately prescribed. MD is particularly suitable in simulating the formation, the deformation, and the evolution of nanocrystals under a fast strain rate. To tackle large scale system and nano-seconds time duration, parallel algorithm is desired. The present paper reviews the recent advances in MD simulation for nanocrystals rithm is desired. The present paper reviews the recent advances in MD simulation for nanocrstals with attention focused on the applications toward nanomechanics. The examined issues are: formation of nanocrystalline metals, nanoindentation on nancorystals, fast deformation of nanocrystals, orderdisorder transition, and nano-particle impact. The project supported by the National Natural Science Foundation of China (101212202 and 90205023)  相似文献   
2.
Simulation for surface self-nanocrystallization under shot peening   总被引:3,自引:0,他引:3  
Driven by high frequency and multi-directional shot peens, dislocations of various orientations proliferate into the metal, and accumulate in high density in the surface layer of a shallow depth. Migration, generation and annihilation of dislocations dictate the evolution of mobile dislocation density. Simulation for the experiment of pure iron under repeated shot peen flux of 800 times per square millimeter is carried out, and a dislocation density up to 2.17×1011 mm−2 is achieved. Dislocations of such density in the surface layer are shown to be capable of forming nano-grains whose size is about 10 nm. Molecular dynamics simulation verifies the formation of nano-grained metals at such dislocation density level. The dislocations are first regrouped to form subcrystallites, then combined to form stable nanocrystallized grains after sufficiently long time of relaxation. The project supported by the National Natural Science Foundation of China (10121202)  相似文献   
3.
纳米力学进展(续)   总被引:2,自引:2,他引:0  
杨卫  王宏涛  马新玲  洪伟 《力学进展》2003,33(2):175-186
概述2002年度在纳米力学方面的若干新进展.在纳观计算力学方面,讨论了在微结构质流演化算法、纳米结构中应变的量子效应算法、LMPM并行算法等方面的进展.在纳观实验力学范畴,着重介绍了立体刻蚀的微加载系统.然后,我们展述了在纳米晶体力学、纳米管力学和纳米压痕力学等方面的新进展.  相似文献   
4.
面对新一轮科技革命和产业变革,培养实践水平与创新能力兼具的工程人才,必须落实到课程改革.本文提出了一种力学创新实践型教学模式,以学生为中心,成果为导向,从知识、能力、价值观三个层次的培养目标出发,通过开设《力学设计与操作》课程实现对教学设计的具体实施.经过七年的持续优化改进迭代,将“学与做”稳固结合,注重理论授课与竞赛促学的反馈优化调整,发展了优质本科生科创团队,教学成果显著,深受学生欢迎.本文是对该课程的介绍、分析与总结,希望对我国“新工科”建设背景下创新型的卓越工程人才课程改革起借鉴作用.  相似文献   
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纳米力学进展   总被引:25,自引:6,他引:19  
杨卫  马新玲  王宏涛  洪伟 《力学进展》2002,32(2):161-174
概述在固态下纳米力学的若干研究内容.首先对纳米力学及其范畴 进行界定,然后介绍纳米力学方法,包括属于纳观计算力学范畴的大规 模分子动力学算法、连续介质/分子动力学交叠层算法、准连续介质算法 和LMPM方法;及属于纳观实验力学范畴的纳米云纹法和纳米压痕法.随即 阐述纳米力学的新兴研究领域:包括纳米晶体的超塑性变形、纳观断裂 力学、纳米管力学和纳米压痕力学.  相似文献   
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