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Mode I Fracture Toughness of Nanorubber Modified Epoxy under Wide loading Rate

机译：宽负载率下纳米橡胶改性环氧树脂的I型断裂韧性

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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.
机译：利用分裂霍普金森张力棒（SHTB）装置研究了纳米橡胶改性环氧树脂的动态模式I断裂韧性，加载速率高达3×104 MPa·√m/ s。还使用Instron机器在〜0.04 MPa·√m/ s和5 MPa·√m/ s的两种加载速率下测量了这些纳米复合材料的准静态韧性。测试的材料是：纯环氧；分别为2、6和10 wt％的纳米橡胶颗粒。设计了在有限宽度方向上具有单边缘裂纹的特殊试样，用于使用SHTB进行模式I韧性测试。此外，使用脉冲整形技术来优化加载应力波，以便使用SHTB进行精确测量。结果表明，在所研究的加载速率范围内，纳米橡胶的存在可以改善散装复合材料的断裂韧性。然而，高负载率可能已经降低了纳米橡胶的气蚀能力，因此与低负载率相比降低了橡胶改性的环氧树脂的韧性。

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