画像処理による凝着点成長解析

概要

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In present paper, the authors have reported a few results obtained from the experiments on the junction growth by observing the junction of the contact point using image analyzer. Aluminium was used as test material because of its soft hardness easy to be deformed plastically. Its shape is conical with an angle 90° in order to investigate the effect of deformation on junction growth. The conical specimen was slid against the transparent Pyrex Glass. An apex deformed under a load and also a process of stretch and growth during sliding have been observed through CCD video Camera. Camera followed on the deformation until a contact point stopped stretching continuously without macro slip. The increased area and variation of the contact part taken through CCD camera have been analysed exactly using image analyzer. As a coefficient of friction corresponding to each point deformed could be obtained, we could estimate the values of normal stress p and shear stress s, accordingly a relation among those two and yield stress Y of the material property. As the results of the experiments we could determin the value of α from the observation. Generally, α is much larger in three dimensional deformation than 3 or 4 in Tresca or Mises theory. Although it is defficult to identify the exact value of α experimentally, we could get some values of α by measuring the real area of contact part through image analyzer.
長崎大学工学部の論文
1994-01-00