Rubber nanocomposites are key materials for aircraft or automobile tires, which are often subjected to the combined effect of pressure and shear during service. However, the effect of pressure on their strain softening under large amplitude oscillatory shear is not yet clarified. Herein a strain-controlled rotational rheometer is used to investigate the influence of axial pressure on the Payne effect of vulcanized natural rubber composites. Under high axial pressure, the Payne effect of rubber vulcanizates is remarkably suppressed, mainly attributed to the increasing intermolecular local friction hindering wall slip and nonlinear stretching of the rubber network. Furthermore, low temperature, high frequency and high filler fraction may weaken the suppression behavior. The investigation may reveal the role of axial pressure in the strain softening of vulcanized rubber.

中文翻译：

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轴向压力对天然橡胶硫化胶佩恩效应的影响


橡胶纳米复合材料是飞机或汽车轮胎的关键材料，在使用过程中经常受到压力和剪切的综合作用。然而，在大幅度振荡剪切下压力对其应变软化的影响尚不清楚。本文使用应变控制旋转流变仪研究了轴向压力对硫化天然橡胶复合材料佩恩效应的影响。在高轴向压力下，硫化橡胶的佩恩效应被显着抑制，这主要是由于分子间局部摩擦力的增加阻碍了壁面滑移和橡胶网络的非线性拉伸。此外，低温、高频和高填料分数可能会削弱抑制行为。该研究可以揭示轴向压力在硫化橡胶应变软化中的作用。