Influence of crack speed on fracture energy in amorphous and rubber toughened amorphous polymers

Autor:	C. Fond, R. Schirrer
Rok vydání:	2001
Předmět:	Toughness Materials science Polymers and Plastics General Chemical Engineering Crack tip opening displacement Fracture mechanics Elastomer Crack growth resistance curve Amorphous solid Crack closure Fracture toughness Materials Chemistry Ceramics and Composites Composite material
Zdroj:	Plastics, Rubber and Composites. 30:116-124
ISSN:	1743-2898 1465-8011
DOI:	10.1179/146580101101541525
Popis:	To study the influence of the crack speed at initiation on measurements of the toughness of amorphous polymers such as polycarbonate (PC) and rubber toughened poly(methyl methacrylate) (RTPMMA), ‘compact tension’ specimens were tested at a medium loading rate (0·6 m s-1 ). The specimens were equipped to allow location of the position of the crack tip and to trigger a photograph on passage of the crack. The experimental procedure was validated using PC for which the crack speed was found to change suddenly over very short distances, owing to stick–slip propagation. Conversely, fracture tests on RTPMMA showed that the acceleration of the crack tip, due to the decrease in fracture energy with crack speed, is controlled by a process zone, the size of which did not allow the systematic use of linear elastic fracture mechanics. The rapid crack propagation regime in RTPMMA corresponds to a propagation stabilised at the macroscopic crack branching velocity. This constant crack speed corresponds to frustr...
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9ab5b82b91e3e7e70573866b242fd0f5 https://doi.org/10.1179/146580101101541525 Zobrazit plný text záznamu