Nanomechanics of Materials and Structures by Tze-jer Chuang, P. M. Anderson, M.-K. Wu, S. Hsieh

By Tze-jer Chuang, P. M. Anderson, M.-K. Wu, S. Hsieh

This quantity presents a serious review of the present cutting-edge in nanomechanics, with specific software to mechanical homes and structural integrity linked to MEMS, NEMS, nanomanufacturing, microelectronics, nanotechnology, biotechnology, and microsystems. It includes articles by way of major foreign specialists in those fields. a different workshop precis identifies significant gaps in current wisdom, obstacles to purposes, and important learn parts for quick improvement of permitting applied sciences. This booklet is a wonderful reference e-book for either educational and business researchers operating within the fields of nanotechnology, biotechnology, engineering, nanotribology and mechanics, fabrics technology and engineering, desktop technological know-how, and knowledge expertise. it is going to even be of curiosity to these pursuing examine in NEMS, MEMS, mesomanufacturing, sensors, actuators, controllers, micromotors, and different microsystems in aerospace, security, and army structures.

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Then the force-strain diagrams tend to curve downward, and it often indicates a decrease in the cross-sectional area, called necking in the macroscopic mechanical test. When n is in the range of 3–10, the nanorods are more like the brittle material, exhibiting little or no yielding before failure. Interesting odd-even effect is also observed in the virtual tension tests for these brittle nanorods. As shown in Fig. 3, when n is an odd number, the maximum force sustainable by the nanorod decreases with the increase of the rod length until n reaches 7, and the tensile response of (AlO)9 has little difference with that of (AlO)7.

26 nm. The size effects on the formation energy ( E f ) of the nanorods are presented in Fig. Formation energy (eV / AlO unit) 2. The formation energy, thereby the stability of the nanorods, is found to increase when the size of the rods increases. 5 0 1 2 3 4 5 6 7 8 9 10 11 Nanorod size n Fig. 2. The formation energies of the nanorods as a function of the number of (A"O)n units. An Ab - Initio Study of Mechanical Behavior for (A"O)n Nanorods 27 The results of the virtual tension tests are presented in Fig.

Ten structures with n increased from 1 to 10 were systematically studied. The nanorods were placed in a periodically repeated supercell, with the nearest distance between replicas larger than 10 Å. The calculations were performed using the Vienna Ab-initio Simulation Package (VASP) [9], which is based on DFT with a plane wave basis set. An Ab - Initio Study of Mechanical Behavior for (A"O)n Nanorods 25 The projector augmented wave (PAW) method [10] was adopted to describe the electron-ion interactions in electronic structure, total energy, and force calculations.

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