透過型電子顕微鏡による真実接触面の直接観察による摩擦機構の解明

抄録

The behavior of materials at the sliding contact is extremely challenging to determine since the contact area is normally hidden from view. We therefore have developed a custom-designed apparatus that enables us to observe the actual contact area while simultaneously measuring the friction/normal forces. From this, we found the von Mises stress applied at the contact area at yield approach the ideal strength of Ag and 20 times higher than that for bulk Ag. The results strongly suggest that the actual contact area at the sliding point forms an amorphous layer and slides while deforming the layer. That indicates we may overestimate the actual contact area and underestimate the stress applied at the contact area if those results were not considered.