Abstract
The fracture behaviour of a specific material, a semi-crystalline biobased polymer, was here 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.
Highlights
There are numerous studies in the literature on the fracture behaviour of materials and structures [1] [2] [3] [4] [5] [6] [7] [8]
We find the zone of penetration of the blade, the zone where conical marks can be observed, an intermediate zone called "mist zone" and a chaotic zone from the point of view of roughness called "hackle zone" [25] [26]
The work described in this article focuses on the qualitative analysis of fracture surface
Summary
There are numerous studies in the literature on the fracture behaviour of materials and structures [1] [2] [3] [4] [5] [6] [7] [8]. From the micro- to the macro-scale, the description of the mechanisms is necessary complex This makes it possible to rigorously evaluate and predict the mechanisms that may lead to the collapse of a structure. The formalism of linear elastic fracture mechanics (LEFM) can be generally used It advises a global approach with the energy release rate G or local with the stress intensity factor K. In this last case, the formalisms of fracture mechanics suggest a local approach with the contour integral J [9]
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