Exact reversiblity in joining and separation

为了零排放世界或材料回收的目的，在连接和分离的过程中检查确切的可逆性。在俄歇电子能谱仪超高真空室中建立了测力系统。介绍了一种压电驱动系统，并用VC++编写了控制软件。实验是在弹性范围内进行的。测量粘附力后，用扫描电子显微镜(SEM)和扫描俄歇显微镜(SAM)观察表面情况。虽然有时可以观察到接触样品之间的原子转移，但有些情况下SAM观察不到原子转移。这些结果表明，在连接和分离过程中存在精确的可逆过程。并用连续介质理论和分子力学理论进行了数值分析。粘附物的理论强度可以用连续介质理论来推导。除了原子大小可以忽略不计的极限外，分子力学变得重要起来。改进的嵌入原子方法(MEAM)是一种适用于表面问题的方法。

For the purpose of the zero-emission world or the recycle of materials, the exact reversiblity is examined in the processes in Joining and Separation. A force measurement system constructed in ultra high vacuum chamber of Auger electron spectroscope is used. A piezo device actuator system is introduced in it and control software is programed by Visual C++. Experiments were carried out in the elastic range. After the measurements of adhesion forces, surfaces were observed by scanning electron microscope (SEM) and scannning 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. The results are discussed with the continuum theory and the numerical analysis using molecular mechanics theory. Theoretical strength of adhered object can be deduced by continuum theory. Except for the limit when the size of atoms are 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.