ABSTRACT Chopped aramid fibre-reinforced rubber composite (AFRC) is widely used in industry owing to its excellent characteristics. Rubber’s mechanical properties vary with the addition of aramid fibres. Although hyperelastic constitutive models exist for unfilled and filled rubber with carbon black, constitutive models for AFRCs have not been investigated yet. Here, we present experimental results demonstrating the stress–strain responses of AFRC, together with the Mullins effect, under both uniaxial and equibiaxial tensile loadings. The existing classical hyperelastic constitutive models and the model proposed here were applied to AFRC. Unlike the existing model, the proposed model requires fewer variables in the energy function and permits further study of the stress-softening mechanism of AFRC. Finally, the pseudo-elastic (PE) model was applied to AFRC, revealing that the damage parameters exhibited a linear relationship with the fibre content. The PE model is, therefore, beneficial for predicting the stress softening behaviour of AFRC.

中文翻译：

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短切芳纶纤维增强橡胶复合材料的超弹性本构模型评估

摘要 短切芳纶纤维增强橡胶复合材料（AFRC）由于其优异的特性而被广泛应用于工业中。橡胶的机械性能随芳纶纤维的添加而变化。尽管存在用于未填充和填充炭黑的橡胶的超弹性本构模型，但尚未研究 AFRC 的本构模型。在这里，我们展示了在单轴和等双轴拉伸载荷下 AFRC 的应力应变响应以及穆林斯效应的实验结果。现有的经典超弹性本构模型和这里提出的模型被应用于 AFRC。与现有模型不同，所提出的模型需要较少的能量函数变量，并允许进一步研究 AFRC 的应力软化机制。最后，将伪弹性 (PE) 模型应用于 AFRC，表明损伤参数与纤维含量呈线性关系。因此，PE 模型有利于预测 AFRC 的应力软化行为。