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Evaluation of fracture toughness of ABS polymers via the essential work of fracture (EWF) method.
- Source :
-
Journal of Materials Science . Sep2012, Vol. 47 Issue 17, p6375-6386. 12p. - Publication Year :
- 2012
-
Abstract
- The essential work of fracture (EWF) method was employed to determine the fracture toughness of SAN/PB-g-SAN blends with the compositions of 65/35-0/100. It was found that the plane stress EWF approach is applicable for different SAN/PB-g-SAN blends. During EWF tests, three different types of load-displacement curves were recorded, depending on the blend composition. For the samples containing rubbery phase of 35-65 wt% crack growth occurred immediately after full ligament yielding. Further increase in rubber content and for the samples with 75 and 85 wt% of rubbery phase, the onset of crack growth was preceded by the formation of necking zone in the form of a sharp load drop after full ligament yielding. For the sample with the composition of 0/100, strain hardening behavior was observed without any sign of neck formation. The specific essential work of fracture (EWF) w increased at first with the increase of PB-g-SAN wt% and then decreased with further increasing amount of rubbery phase. The maximum value of w was observed for the blend with 75 wt% of PB-g-SAN. The specific non-essential work of fracture βW increased with increasing of rubbery phase concentration. The analyzing of yielding and necking/tearing components of essential and non-essential parameters showed that for the samples containing 55 wt% and higher of rubbery phase, $$ w_{\text{e,nt}} \succ w_{\text{e,y}} $$and $$ \beta_{\text{nt}} w_{\text{p,nt}} \succ \beta_{\text{y}} w_{\text{p,y}} $$, indicating that a majority of fracture energy was dissipated in the necking and tearing stages of fracture process. Finally, it is shown that w values can be predicted via COD values. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00222461
- Volume :
- 47
- Issue :
- 17
- Database :
- Academic Search Index
- Journal :
- Journal of Materials Science
- Publication Type :
- Academic Journal
- Accession number :
- 76517324
- Full Text :
- https://doi.org/10.1007/s10853-012-6562-4