The wear performance of rubber depends on its own cohesion and the adhesion of the friction surface, including the combined influence of the tear strength, elongation at break, fatigue resistance, viscoelastic properties, etc. of the base material. It cannot be generally said that wear is related to a certain physical property.
The rubber DIN wear test belongs to abrasion wear, which is a phenomenon in which the rubber surface is microscopically damaged and falls off due to friction. Under a certain load pressure, the rubber sole test piece is rotated and rolled at a certain angle with the friction wheel. Due to the friction of the sharp points on the surface of the grinding wheel, the rubber surface is locally stressed. At the stress concentration point, the rubber is strongly torn off, forming tiny particles that fall off and cause wear. When the sharp points on the surface of the grinding wheel are very sharp, the rubber surface will be scratched, and there will be strips parallel to the sliding direction. This is a characteristic of cutting wear and scratch wear, and is a manifestation of abrasion wear.
Test conditions:
The bottom materials of protective shoes such as high and low voltage insulating shoes (boots), acid and alkali resistant rubber boots, etc. are all tested using the Akron wear test method specified in the standard. In order to obtain a high reproducibility of the test results, strict test conditions must be used.
The test results show that the error of the angle between the rubber wheel shaft and the grinding wheel shaft, the hardness of the rubber wheel, the thickness of the rubber bottom test piece, and the temperature of the test environment all have a certain impact on the test results.
The larger the angle between the rubber wheel shaft and the grinding wheel shaft, the greater the wear loss. In addition, the increase in the hardness of the rubber wheel, the increase in the thickness of the test piece, and the increase in the test temperature will also increase the wear loss.
Test procedure:
Pre-grind the glued test wheel for 15 to 20 minutes, remove it, brush off the rubber scraps, weigh it (accurate to 0.0019), and use the pre-grinded sample for testing. After the sample has traveled 1.61km, remove it, brush off the rubber scraps, and weigh it within 1h (accurate to 0.001g).
Several factors that cause poor reproducibility of test results Through comparative analysis of various test conditions, we believe that the influence of instruments and equipment is the main one, especially the angle between the rubber wheel axis and the grinding wheel axis and the load on the specimen, which have a great impact on the test results.