Dynamic crack propagation in wood fibre composites analysed by high speed photography and a dynamic phase field model

• DOI: 10.1016/j.ijsolstr.2018.04.015
• Publication Date: 2018-04-27T22:02:30Z
• Authors: Jenny Carlsson; Per Isaksson
• Keywords: Polylactic Acid; High-speed photography; Branching (polymer chemistry)

Using an experimental setup, with a high-speed camera to track crack tip velocity, dynamic fracture is studied in wood fibre polylactic acid (PLA) composite and pure PLA. The experiments are analysed quantitatively terms of the relation between energy release rate qualitatively branching occurrence surface appearance. Branching occurs frequently PLA specimens but not specimens, spite high rates. Scanning electron microscopy images surfaces show that materials rugged uneven compared PLA, whose smoother. results numerical results, obtained using phase field finite element model. Simulations correlate well respect velocity. For simulations also predict correctly, for composites, slightly over-predict amount point need further development models order better capture constitutive behaviour these heterogeneous materials.