Stick-slip influencing scratch of PP

What is it about?

For the scratch process of polypropylene (PP), the stick-slip phenomenon contributes to the observed periodic surface damage patterns and eventually induces scratch visibility. In this work, both ASTM/ISO and Erichsen scratch test methods are employed to study the stick-slip phenomenon and its effects on scratch behavior of PP. It was found that the stick-slip phenomenon was responsible for material removal and severe surface damage.

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Why is it important?

The injection molding auto parts will inevitably experience scratches during the process of manufacturing, transporting and daily using. It is necessary to understand the fundamental mechanism(s) behind the visibility induced by scratch to overcome this obstruction. The experimental results in this work certify that the stick-slip phenomenon is well correlated with the scratch visibility and the periodic stick-slip distance could be used as an evaluation parameter of scratch resistance of PP.