中文摘要：

采用新型裤形撕裂试样,研究白炭黑和短纤维补强的天然橡胶（NR）复合材料在不同撕裂速率下的撕裂性能。结果表明：白炭黑/NR复合材料在低撕裂速率下有较高的撕裂强度,反之撕裂强度降低,撕裂在中低撕裂速率下呈现典型的＂粘附-滑移＂特点,在高撕裂速率下呈现＂锯齿状＂;在短纤维/白炭黑/NR复合材料中,撕裂路径在中低撕裂速率下明显向腿部偏移,在高撕裂速率下也出现波动较小的＂锯齿状＂撕裂,撕裂路径和撕裂强度更为稳定。

英文摘要：

The tearing property of NR composite reinforced with silica and short fiber at different tearing speeds was investigated using a new type of trouser tear sample.The results showed that,the tearing strength of the composite at low tearing speed was much higher than that at high tearing speed.As for silica- reinforced NR composite, tearing region showed typical ＂stick-slip＂ feature at medium-low tearing speed and ＂sawtooth＂ tearing at high tearing speed.As for NR reinforced with short fiber and silica, tearing path apparently turned to＂leg＂of the sample at medium-low tearing speed. At high tearing speed, tearing region also showed ＂sawtooth＂ feature, and the tearing path and strength were more stable than that at low tearing speed.