OZONE DETERIORATION TESTING METHOD FOR VULCANIZED RUBBER

摘要

PURPOSE:To evaluate the ozone deterioration state of a vulcanized rubber test piece quantitatively and correctly by extracting the crack section of a pickup image in an image analyzer, and calculating the ration of the area of the crack section against the total area. CONSTITUTION:A test piece 1 is applied with fixed extension and put in an ozone tank, it is exposed in the ozone atmosphere for a preset period, the surface state of the test piece 1 is observed by an optical microscope while it is extended by the preset quantity, and an optional portion near the center section is photographed with a video camera 2 serving as an image pickup device. The photographed image is inputted to an image analyzer 3. The ratio of the area of a crack section against the total area (crack area ratio lambda) is calculated based on the properly corrected binary image in the analyzer 3, and the result is outputted for display. The ozone deterioration state of the test piece 1 is quantitatively evaluated by the value of the crack area ration lambda(%) outputted from the analyzer 3.