Engineered injection molded plastics are now common substrates of choice for painted bumper fascias in the automotive industry. A major challenge for painted fascias involves potential warranty costs associated with various tribological scenarios that can result in moderate to severe paint delamination. Preliminary failure analysis performed on field specimens indicate that surface damage in majority of cases to be cohesive, within the surface layers of the substrate. This failure mode is typical of polyolefine substrates such as impact modified polypropylenes and referred to FIR (friction induced damage). A specially designed computer controlled laboratory device and an approach to objectively assess FID to painted plastics based on optical observation of test specimens and measurement of total energy consumed during the sliding process are described. This device simulates FID performance similar to those observed in the field. This work is the first of its kind describing FID phenomenon, and its quantitative assessment. Ranking of painted plastics for FID based on this device has aided in the implementation of robust substrate/painted material systems with proven improvement in surface durability.
Friction induced paint damage - A novel method for objective assessment of painted engineering plastics
1997
12 Seiten, 14 Bilder, 2 Tabellen, 22 Quellen
Conference paper
English
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