Exact reversibility in joining and separation

点击翻译按钮获取中文摘要

For the purpose of the zero-emission world or the recycle of materials, the exact reversiblity has to be examined in the processes in Joining and Separation. A force measurement system constructed in ultra high vacuum chamber of Auger electron spectroscope is used. The results are discussed with the continuum theory and the numerical analysis using molecular mechanics theory.Experiments were carried out in the elastic range. After the measurements of adhesional forces, surfaces were observed by scanning electron microscope (SEM) and scanning Auger microscope (SAM). Although the atomic transfer between contacting samples was sometimes observed, there are some cases no transfer could observed by SAM. These results suggest the existence of exact reversible processes in Joining and Separation. .In theoretical approach, theoretical strength of adhered object can be deduced by continuum theory. The solution is exact one and conventional theory and formula were found to be an approximation of it. At the limit when the size of atoms are not negligible, molecular mechanics becomes significant. The modified embedded atom method (MEAM) which is made for the bulk is found to have applicability to surface problems.