Mode I Fracture Toughness of Nanorubber Modified Epoxy under Wide loading Rate
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.
Nano-rubber modified epoxy fracture toughness high strain rate Hopkinson bar
Ying-Gang Miao Hong-Yuan Liu Yu-Long Li Hsiu Hsien Wu Yiu-Wing Mai
School of Aeronautics,Northwestern Polytechnical University,Xian,Shaanxi Province,710072,P.R.China; Center for Advanced Materials Technology (CAMT),School of Aeronautics,Mechanical & Mechatronic Engin School of Aeronautics,Northwestern Polytechnical University,Xi’an,Shaanxi Province,710072,P.R.China
国际会议
北京
英文
1-8
2013-06-16（万方平台首次上网日期，不代表论文的发表时间）