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Determination of Fracture Mechanical Characteristic Values in Correlation to Structural Parameters of Polyethylene High Density

The fracture mechanics evaluation of high-density polyethylene concerning the chemical and physical structure of the semi-crystalline polymer was the aim of this thesis. Thereby the current question of the correlation between morphology and toughness of polymers plays an important role. The instrumented Charpy impact test was the experimental basis of the fracture mechanics investigations. With the help of fracture mechanics methods the toughness behaviour at unstable and stable crack propagation was characterized in dependence on the structural parameters like molecular weight, crystallinity and long period. For the evaluation of the toughness behaviour at stable crack propagation the crack resistance curve was used. Considering the elastic-plastic material behaviour of high-density polyethylene the concepts of EPFM (i.e. the J-integral and the crack opening displacement concept) were used for the assessment of both testing methods. Different fracture mechanics methods were applied to determine geometry-independent fracture mechanics values for resistance against unstable and stable crack initiation and for resistance against stable crack growth. The influence of the tie molecule density on the toughness behaviour of high-density polyethylene was extensively considered. Therefore various calculation models from the literature for the estimation of the tie molecule density were introduced.

Lesen Sie die deutsche Zusammenfassung auf Kunststoffe.de
Author
 Heike Beerbaum

Heike Beerbaum
Institut für Polymerwerkstoffe e.V.
Martin-Luther-Universität Halle-Wittenberg

Information

Free keywords: polyethylene, structure, fracture mechanics, toughness, crack propagation model, Charpy impact test, crack resistance curve, crystallinity, tie molecules, lamellae
Institute / chair: Mathematisch-Naturwissenschaftliche Technische Fakultät der Martin-Luther-Universität Halle-Wittenberg
Language: German
Technical consultant for expert services: Prof. Dr. rer. Nat. habil. W. Grellmann (Betreuer), Prof. Dr.-Ing. K. Friedrich, Prof. Dr.-Ing. habil. S. Seidler
Publication year: 1999
Provider: Wissenschaftlicher Arbeitskreis Kunststofftechnik (WAK) / Kunststoffe.de

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