Peel Force – Fracture Path Diagram
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Peel force–fracture path diagram, peel force–elongation diagram”
or simplified in short: “peel curve”
Registration of peel curves
The peel force–fracture path diagram (peel curve) refers to the force–elongation diagram (Fig. 1) recorded during the peel process in a peel test (T-peel test or fixed-arm peel test). The peel force is usually determined from the peel force–fracture path diagram as the mean value of the forces measured between 20 % and 80 % of the fracture path lB.
| Fig. 1: | Peel force–fracture path diagram (peel curve) from the peel test, Fpeel – peel force; lB – fracture path; EG – total peel energy |
Material example PE-LD/iPB-1
Using the example of the peel system low-density polyethylene blended with isotactic polybutene-1 (abbreviation: PE-LD/iPB-1), the peel force–fracture path diagrams (peel curves) recorded during the T-peel test for different iPB-1 contents of 6, 10, and 20 m.-% are shown in Fig. 2. The peel curves shown typically exhibit two local maxima, the presence of which is due to the concave cross-section of the sealed seam. Furthermore, the plateau range used to determine the measured variable peel force is clearly visible in the peel curves. The force level of this plateau range and also the fracture path lB are reduced with increasing iPB-1 mass content.
| Fig. 2: | Representation of selected peel force–fracture path diagrams |
See also
References
- Nase, M., Langer, B., Grellmann, W.: Bruchmechanische Kennwertermittlung im T-Peeltest und im Fixed-Arm Peeltest. In: Frenz, H., Grellmann, W. (Eds.): 26. Tagung Werkstoffprüfung „Herausforderung neuer Werkstoffe an die Forschung und Werkstoffprüfung“, Berlin (2008) Proceedings pp. 223–228, (ISBN 978-3-00-026399-6; see AMK-Library under A 10) Download as pdf
- Nase, M., Langer, B., Grellmann, W.: Fracture Mechanics on Polyethylene/polybutene-1 Peel Films. Polymer Testing 27 (2008) 1017–1025; https://doi.org/10.1016/j.polymertesting.2008.09.002
- Nase, M.: Zusammenhang zwischen Herstellungsbedingungen, übermolekularer Struktur und Eigenschaften von Peelfolien. Shaker Publishing (2010) (ISBN 978-3-8322-9099-3; see AMK-Library under B 1-17)