SHEET FOR MEASURING SURFACE STRAIN OF RUBBER PRODUCT, METHOD OF MEASURING SURFACE STRAIN OF RUBBER PRODUCT, SHEET FOR MEASURING SURFACE STRAIN OF RUBBER TIRE, AND METHOD OF MEASURING SURFACE STRAIN OF RUBBER TIRE

摘要

PROBLEM TO BE SOLVED: To measure surface strain of a rubber product simply and precisely.

SOLUTION: The measurement sheet for surface strain is cut into a proper size and stuck onto a surface of a side wall 10sw of a tire 10 an objective product for measurement. The grating on the surface strain measurement sheet 1 is colored and the grating on the surface strain measurement sheet 1 is transferred on a recording medium 51such as a sheet of paper, or a transparent OHP sheet, thus the grating pattern 1i1before a deformation of side wall 10sw is obtained, then a load P is imparted to the tire 10 so as to deform the surface of the side wall 10sw, and the grating pattern 1i2after deformation of the side wall 10sw is obtained. the grating patterns 1i1and 1i2of the side walls 10sw before and after the deformation are obtained. From the grating patterns 1i1and 1i2, the coordinates of the grating are obtained, thereby the surface strain of the object is calculated based on the coordinates.

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