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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers. Part L, Journal of Materials: Design and Application >Monotonic and cyclic behavior of polyamide 66/hectorite nanocomposites in marine environment
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Monotonic and cyclic behavior of polyamide 66/hectorite nanocomposites in marine environment

机译：聚酰胺66 /锂蒙脱石纳米复合材料在海洋环境中的单调和循环行为

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摘要

Product design for safe performance and operation in harsh environments triggers the importance of understanding property degradation due to prolonged exposure of advanced composite materials to such environments. The effect of seawater immersion on monotonic tensile, stress relaxation, and cyclic bending fatigue response of polyamide 66 nanocomposites containing 0%, 1%, and 5% hectorite organoclay were investigated. Seawater equilibrated nanocomposites demonstrated less moisture absorption compared to their pure counterparts. The imbibed seawater significantly increased the ductility, and reduced the tensile modulus and strength of nanocomposites. A nine-parameter Prony series viscoelastic constitutive model was used to estimate the influence of seawater on the viscoelastic behavior based on stress relaxation data. The phenomenological model evaluated a drop of 82% in the instantaneous and the residual elastic moduli indicating a significant plasticizing effect of seawater. However, the amount of increase in the rubbery nature of polyamide is observed from the reduction in stress relaxation time of first Maxwell element by about 40%. Nanocomposites exhibited improved fatigue life with an increase in organoclay content even after equilibration in seawater. The fracture surface observation of seawater equilibrated bending fatigue specimen revealed rubbery behavior indicating the positive difference between cyclic steady-state temperature and material glass transition temperature.
机译：在恶劣环境中确保安全性能和运行的产品设计触发了理解由于高级复合材料长时间暴露于此类环境而导致的性能下降的重要性。研究了海水浸没对含有0％，1％和5％锂蒙脱石有机粘土的聚酰胺66纳米复合材料的单调拉伸，应力松弛和循环弯曲疲劳响应的影响。与纯净的同类产品相比，海水平衡的纳米复合材料的吸湿性更低。吸收的海水显着提高了延展性，并降低了纳米复合材料的拉伸模量和强度。基于应力松弛数据，使用九参数Prony系列粘弹性本构模型估算海水对粘弹性行为的影响。现象学模型评估了瞬时模量和残余弹性模量下降了82％，表明海水具有显着的增塑作用。但是，从第一麦克斯韦元件的应力松弛时间减少了约40％可以观察到聚酰胺橡胶性质的增加。纳米复合材料即使在海水中平衡后，也表现出改善的疲劳寿命以及有机粘土含量的增加。海水平衡弯曲疲劳试样的断裂表面观察显示出橡胶行为，表明循环稳态温度与材料玻璃化转变温度之间存在正差。

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