Plastic Pipes Conference Association # 2021 Amsterdam
Gerald Pinter, Johannes Wiener, Florian Arbeiter, Abhishek Tiwari, Otmar Kolednik
For pipe applications, catastrophic failure due to crack growth has to be prevented by all means. Techniques to develop new and even tougher pipe materials are explored in this contribution. The aim is to create a multi-layer architecture, that exhibits high toughness as well as damage tolerance towards sharp notches. While many examples of such materials exist in nature, the same principles have not been applied to engineering materials yet. The effectiveness of soft interlayers as crack arresters are investigated using various grades of Polypropylene. Based on FE analysis, using the concept of configurational forces, a material combination of mineral reinforced PP and compliant PP was chosen for multi-layer constructions. The effectiveness of a single IL as crack arrester could be verified using single edge notch bending experiments. Therein, an abrupt increase in the toughness could be observed at the interlayer position when compared to the homogeneous matrix material. A growing crack is arrested by the interlayer and a new crack has to re-initiate in order to induce complete specimen failure. Upscaling this effect to many layers has shown great success in Charpy impact tests on micro-layered materials. From the gathered information, a cohesive zone model could be formulated to describe the complex failure mechanism of the multi-layer material. After the successful prediction of testing specimens, it is now possible to design a multi-layer pipe using the investigated methods and materials.
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