Abstract
Dynamic mode I fracture toughness of nano-rubber modified epoxy were investigated using the split Hopkinson tension bar (SHTB) facility, with loading rates up to 3×104 MPa·√m/s. The quasi-static toughness of those nanocomposites were also measured with an Instron machine at two loading rates of ∼0.04 MPa·√m/s and 5 MPa·√m/ s, respectively. The materials tested are: neat epoxy; and 2, 6 and 10 wt.% nano-rubber particles, respectively, in epoxy. Special specimens with a single-edge crack in the finite width direction were designed for mode I toughness testing with the SHTB. In addition, pulse shaping technique was used to optimize the loading stress wave for accurate measurements with the SHTB. The results indicated that the presence of nano-rubber could improve the fracture toughness of the bulk composites in the range of loading rates studied. However, high loading rates might have degraded the cavitation capability of the nano-rubber and hence decreased the toughness of the rubber-modified epoxies compared to low loading rates.
| Original language | English |
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| Pages | 2736-2743 |
| Number of pages | 8 |
| State | Published - 2013 |
| Event | 13th International Conference on Fracture 2013, ICF 2013 - Beijing, China Duration: 16 Jun 2013 → 21 Jun 2013 |
Conference
| Conference | 13th International Conference on Fracture 2013, ICF 2013 |
|---|---|
| Country/Territory | China |
| City | Beijing |
| Period | 16/06/13 → 21/06/13 |
Keywords
- Fracture toughness
- High strain rate
- Hopkinson bar
- Nano-rubber modified epoxy