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Frictional experiments of rubber against spherical hard solids were carried out. The contact states between the rubber specimens and the spherical solids were observed by using X-ray imaging method in SPring-8; Beam line 19B2; X-ray energy = 25 keV; Pixcel size of X-ray images = 10 μm. The real time observation by using the brilliant X-ray of the synchrotron was applied to characterize the contact states of opaque rubbers during friction. Under the following conditions, diameter of glass sphere as the mated surface = 3 mm and transverse velocity of the mated surface = 0.3 mm/s, the contacting geometry and frictional force were measured simultaneously, and then relationship between the contact state and the frictional force was investigated. The frictional force shows a correlation with the contact area or the shear stress of the rubber. Consequently, it was summarized that the real time observation during friction using X-ray imaging is very effective to understand the mechanism of rubber friction. The synchrotron radiation experiments were performed at BL19B2 in the SPring-8 with approval of the Japan Synchrotron Radiation Research Institute (JASRI) (Proposal No. 2005B0877).

nihon gomu kyoukaishi

Analysis of Contact States between Rubber and Mated Surface Using X-ray Imaging Method-Studies on Contact States of Rubber Sliding on Spherical Hard Solids-