Plastic Scratch Test Scratch Resistance Test

Scratch resistance test is an important quality control indicator of plastic parts for automobile interior and exterior decoration. The plastic scratch resistance tester is an experimental equipment for plastic parts scratch testing. High cost performance, welcome customers who need to inquire.

Plastic scratch resistance test principle:

The scraper head acts on the surface of the sample with a certain pressure, scratching The rubbing head and the test sample move relative to each other at a certain speed, and the trajectory is usually a straight line or a circle. When the material is not strong enough to resist external scratches, plastic deformation occurs and the surface of the material is destroyed. Factors such as scratch head, load (pressure) and state of motionrelative t of sample and scratch head basically determine the scratch resistance test method. First of all, the material, shape and size of the scratch head are the key factors in determining the scratch test method. Different tests usually correspond to different scratch heads. Common scraper heads are hemispherical or spherical steel materials, which meet certain hardness requirements after heat treatment, with a diameter of 1mm, 0.75mm or 0.5mm; on the other hand, the load is the pressure applied by the scraping head to the surface of the material. It is also a very critical parameter, which characterizes the level of severity of the test. Different scratch resistance test methods have different loading methods, such as weight loading, lever loading and compression spring loading, etc. The conditions, the state of the relative movement of the headscraping and material, such as speed and stroke, are relatively minor parameters. In the first scratch resistance test, manual operation was mainly used, and the test speed consistency could not be guaranteed. However, with the continuous development of the instrumented scratch resistance test equipment, the test speed can be kept constant and the repeatability and reproducibility of the test can be improved. improve.

Effect of material and surface parameters on scratch performance:

Scratch performance experiment of polymeric materials should use finite element numerical simulation technology as an auxiliary , we found that the influence of the surface parameters of the molecular material, so the influence of the performance of the melon loss according to the surface parameters of the material is as follows: First, the influence of the melon loss performance is as follows:Poisson\'s e in the material on the scraping of the material is negligible. The scratch performance of polymeric materials is not necessarily related to the elastic modulus of the material, but the material with the largest elastic modulus is more affected by the scratch resistance under the influence of temperature. The increase in material yield can reduce plastic deformation and improve the scratch resistance of the material. The smaller the surface friction coefficient of the polymer material, the better the scratch performance. The surface texture of polymeric materials has a great influence on the coefficient of friction, and its shape can be changed to improve the scratchability of the material. However, the surface texture can play a good role in hiding scratches, which has great reference value for car surface repair. In the analysis of material and surface parameters,it is very important to strengthen the composition of the scratch resistance material.

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