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首页> 外文期刊>Journal of Applied Polymer Science >Application of time-stress superposition to viscoelastic behavior of polyamide 6,6 fiber and its 'true' elastic modulus
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Application of time-stress superposition to viscoelastic behavior of polyamide 6,6 fiber and its 'true' elastic modulus

机译：时间应激叠加在聚酰胺6,6纤维粘弹性行为及其“真”弹性模量的应用

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摘要

The viscoelastic behavior of semi-crystalline polyamide 6,6 fiber is exploited in viscoelastically prestressed polymeric matrix composites. To understand better the underlying prestress mechanisms, strain-time performance of the fiber material is investigated in this work, under high creep stress values (330-665 MPa). A latch-based Weibull model enables prediction of the "true" elastic modulus through instantaneous deformation from the creep-recovery data, giving 4.6+/-0.4 GPa. The fiber shows approximate linear viscoelastic characteristics, so that the time-stress superposition principle (TSSP) can be implemented, with a linear relationship between the stress shift factor and applied stress. The resulting master creep curve enables creep behavior at 330 MPa to be predicted over a large timescale, thus creep at 590 MPa for 24 h would be equivalent to a 330 MPa creep stress for similar to 5200 years. Similarly, the TSSP is applied to the resulting recovery data, to obtain a master recovery curve. This is equivalent to load removal in the master creep curve, in which the yarns would have been subjected to 330 MPa creep stress for similar to 4.56 x 10(7) h. Since our work involves high stress values, the findings may be of interest to those involved with long-term load-bearing applications using polyamide materials. (C) 2017 Wiley Periodicals, Inc.
机译：半结晶聚酰胺6,6纤维的粘弹性行为在粘接性预应力的聚合物基复合材料中利用。为了了解较好的底层预应力机制，在高蠕变应力值（330-665MPa）下，在这项工作中研究了纤维材料的应变时间性能。基于闩锁的Weibull模型使通过蠕变恢复数据的瞬时变形来预测“真”弹性模量，给出4.6 +/- 0.4 GPA。光纤表示近似的线性粘弹性特性，从而可以实现时应力叠加原理（TSP），应力换档因子与施加应力之间的线性关系。所得到的主蠕变曲线使得在330MPa下实现蠕变行为，以预测大量时间，因此在590MPa蠕变24小时将相当于330MPa蠕变应力，类似于5200岁。类似地，TSSP应用于所产生的恢复数据，以获得主恢复曲线。这相当于母蠕变曲线中的负载去除，其中纱线已经经受330MPa蠕变应力，同样为4.56×10（7）小时。由于我们的作品涉及高应力值，因此研究结果可能是使用聚酰胺材料参与长期承载应用的影响。 （c）2017 Wiley期刊，Inc。

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