In this research filled natural rubber (NR), butadiene rubber (BR) and a 50/50 NR/BR blend, having different carbon black (CB) contents, were studied. Dynamic-mechanical characterization, tensile tests were carried out. Fracture tests using notched pure shear test specimens were also performed. The fracture mechanics approach was applied so as to determine J-integral at crack onset. Fracture phenomenology was analysed from video-recordings of the tests. It was observed that ‘sideways’ cracks propagating at the crack tip in the loading direction before the onset of a ‘forward’ crack propagating along the notch plane and which are responsible for high toughness values develop for rubber contents above 35 phr of rubber for NR and the NR/BR blend, while for BR a larger carbon black content is required.

Mechanical characterization of carbon black filled NR/BR compounds from small strains up to fracture

CAZZONI, EMANUELE;MARANO, CLAUDIA;RINK SUGAR, MARTA ELISABETH
2013

Abstract

In this research filled natural rubber (NR), butadiene rubber (BR) and a 50/50 NR/BR blend, having different carbon black (CB) contents, were studied. Dynamic-mechanical characterization, tensile tests were carried out. Fracture tests using notched pure shear test specimens were also performed. The fracture mechanics approach was applied so as to determine J-integral at crack onset. Fracture phenomenology was analysed from video-recordings of the tests. It was observed that ‘sideways’ cracks propagating at the crack tip in the loading direction before the onset of a ‘forward’ crack propagating along the notch plane and which are responsible for high toughness values develop for rubber contents above 35 phr of rubber for NR and the NR/BR blend, while for BR a larger carbon black content is required.
Constitutive models for rubber VIII
9781138000728
File in questo prodotto:
File Dimensione Formato  
Paper.pdf

Accesso riservato

: Post-Print (DRAFT o Author’s Accepted Manuscript-AAM)
Dimensione 554.13 kB
Formato Adobe PDF
554.13 kB Adobe PDF   Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11311/910156
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 0
  • ???jsp.display-item.citation.isi??? ND
social impact