Artículos de revistas
Fracture behavior of recyclable all-polypropylene composites composed of α- and β-modifications
Fecha
2011-11Registro en:
Stocchi, Ariel Leonardo; Pettarin, Valeria; Izer, Andras; Bárány, Tamás; Czigány, T.; et al.; Fracture behavior of recyclable all-polypropylene composites composed of α- and β-modifications; Sage Publications Ltd; Journal Of Thermoplastic Composite Materials; 24; 6; 11-2011; 805-818
0892-7057
Autor
Stocchi, Ariel Leonardo
Pettarin, Valeria
Izer, Andras
Bárány, Tamás
Czigány, T.
Bernal, Celina Raquel
Resumen
The fracture behavior of all-PP composites was studied under quasi-static loading conditions. Fracture toughness was evaluated by means of different fracture mechanics approaches depending on materials’ behavior. Composites consolidated at low temperature exhibited pop-in features and the failure occurs typically by delamination and tape stretching and fracture. With increasing consolidation quality – i.e., with increasing processing temperature – the delamination became less pronounced, and so the tape stretching occurred, before the specimens break. In composites consolidated at the highest temperature investigated (190°C), the laminate-like structure typical of self-reinforced composites produced according to film-stacking method was lost. Accordingly, composites behave as if they were only α-PP and β-PP matrices: α-rPP exhibited typical brittle fracture of α-PP, while β-rPP exhibited the stable behavior with fully yielded ligament before crack propagation commonly observed for β-PP. In general, stress–strain behavior changed from stable to unstable and fracture toughness strongly decreased as consolidation quality increased. Based on these results and previous findings, it can be concluded that the properties of self-reinforced PP composites can be tailored for a given application through the quality of consolidation.