The current share of plastic in waste electrical and electronic equipment (WEEE) is considerable approximately 25%. This potential should be used by recycling to create economic, environmental and financial benefits. In order to investigate the influence of potential label impurities that can occur as contaminations in recycled plastics, a testing series based on controlled contamination and shredding of virgin polycarbonate (PC)/acrylonitrile–butadiene–styrene (ABS) was developed. PC/ABS granules and paper labels as well as two different types of polypropylene (PP1 and PP2) in different concentrations were stepwise processed and injection moulded into specimens. The influence of the three different impurities and their concentrations on the mechanical properties of the plastic were investigated.
Plastic components subjected to a constant load, such as pipes or load‐bearing structures in motor vehicles, tend to creep and show increased deformation over time. In special applications for example coolant expansion tanks, increased temperatures and media also affect the long‐term creep behavior. In this study, the influence of media–thermal aging on the long‐term creep behavior is investigated for predicting service life.
KurzfassungDie Kenntnis der Deformations- und Schädigungsmechanismen beim langsamen Risswachstum in Polyethylen (PE)-Rohrwerkstoffen ist im Hinblick auf ihre Lebensdauervorhersage von besonderer Bedeutung. Eine etablierte Möglichkeit der Simulation und Vorhersage des langsamen Risswachstums ist der Full-Notched Creep Test (FNCT), der besonders bei den heute verwendeten PE-Rohrwerkstoffen durch sehr lange Prüfzeiten gekennzeichnet ist. Aus diesem Grund wurde in der vorliegenden Arbeit nach Korrelationen gesucht, die zwischen Methoden der Kurzzeitprüfung und dem Full-Notched Creep Test bestehen. Als Methoden der Kurzzeitprüfung wurden die für Kunststoffe etablierten bruchmechanischen Konzepte “Essential Work of Fracture” und “Risswiderstandskurve” gewählt.
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