The effects of specimen size and testing conditions on fracture toughness evaluation of polypropylene homopolymer
The results of an experimental test program performed to investigate the influenceof specimen dimensions and testing rate conditions on room temperature fracturetoughness of PP homopolymer are presented. The material displayed nonlinearload-displacement behavior and exhibited small amounts of slow c...
| Autores: | , |
|---|---|
| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 2007 |
| País: | Argentina |
| Institución: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repositorio: | CONICET Digital (CONICET) |
| Idioma: | inglés |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/35603 |
| Acceso en línea: | http://hdl.handle.net/11336/35603 |
| Access Level: | acceso abierto |
| Palabra clave: | Weakest Link Model Polypropylene https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 https://purl.org/becyt/ford/2.5 https://purl.org/becyt/ford/2 |
| Sumario: | The results of an experimental test program performed to investigate the influenceof specimen dimensions and testing rate conditions on room temperature fracturetoughness of PP homopolymer are presented. The material displayed nonlinearload-displacement behavior and exhibited small amounts of slow crack growth(ductile tearing) prior to cleavage instability, which invalidates the direct applicationof the current standards for the determination of KIC in polymers. Data points wereconsiderably scattered consistently with typical ductile-brittle transition patterns.The resulting load-displacement diagrams were analyzed in terms of KQ, KMAX, andthe ratio PMAX/PQ. The fracture toughness at instability, JC, was also computed andplotted against the amount of stable crack growth in order to construct J-R curvesas a function of size and strain rate. From these curves an alternative critical fractureparameter, KJIC, was calculated. Weibull statistics were used as a tentative approachfor treating the scatter of fracture toughness of polypropylene homopolymerin large samples, which exhibited restricted ductile tearing. The significance of eachof these methods and the validity and size independence of the corresponding parametersare discussed. |
|---|