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Dynamic fracture in a semicrystalline biobased polymer: an analysis of the fracture surface

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Abstract

The fracture behaviour of a semi-crystalline bio-based polymer was studied. Dynamic fracture tests on strip band specimens were carried out. Fracture surfaces were observed at different scales by optical and electron microscopy to describe cracking scenarios. Crack initiation, propagation and arrest zones were described. Three distinct zones are highlighted in the initiation and propagation zone: a zone with conical markings, a mist zone and a hackle zone. The conical mark zone shows a variation in the size and density of the conical marks along the propagation path. This is synonymous with local speed variation. Microcracks at the origin of the conical marks in the initiation zone seem to develop from the nucleus of the spherulites. In the propagation zone with complex roughness, the direction of the microcracks and their cracking planes are highly variable. Their propagation directions are disturbed by the heterogeneities of the material. They branch or bifurcate at the level of the spherulites. In the arrest zone, the microcracks developed upstream continue to propagate in different directions. The surface created is increasingly smoother as the energy release rate decreases. It is shown that the local velocity of the crack varies in contrast to the macroscopic speed. A specific setup allowing to estimate the minimum fracture energy of the material in order to maintain the rapid propagation of the crack is proposed for materials with antagonistic behaviour: ductile at initiation and brittle in propagation.

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Acknowledgements

The authors would like to warmly thank the participation in this work of V. Honno and A. Bradu who did a Bachelor internship on the subject and J. Bega for his technical support on microscopic analyses.

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  1. Arts et Metiers Institute of Technology, Université de Bordeaux, CNRS, INRA, INP, I2M, HESAM Université, Esplanade des Arts et Métiers, 33400, Talence, France

    Jean-Benoît Kopp & Jeremie Girardot

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  1. Jean-Benoît Kopp
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Correspondence to Jean-Benoît Kopp.

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Kopp, JB., Girardot, J. Dynamic fracture in a semicrystalline biobased polymer: an analysis of the fracture surface. Int J Fract 226, 121–132 (2020). https://doi.org/10.1007/s10704-020-00482-y

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