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首页> 外文期刊>Journal of Applied Polymer Science >Anisotropic mechanical behavior of magnetically oriented iron particle reinforced foams
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Anisotropic mechanical behavior of magnetically oriented iron particle reinforced foams

机译：磁性取向的铁颗粒增强泡沫的各向异性力学行为

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摘要

Reinforced foams were prepared by exposing a polyurethane matrix filled with iron particles to a magnetic field during the foaming process. The magnetic field induced an alignment of the iron particles along the field direction, giving rise to columnar structures similar to fibrils, as observed by SEM and microtomographic 3D reconstructions. The anisotropic reinforcement induced by the fibrils improved the mechanical performances, yielding a threefold increase of both elastic modulus and yield stress in the alignment direction, whereas minor effects were observed in the transversal direction. In this case, the mechanical properties were comparable with those of randomly filled foams or, in some cases, of unfilled foam. The reinforcing efficiency of fibrils was evaluated through a theoretical model, based on the combination of the mechanics of foams with two micromechanical models for aligned short fibers composites (Halpin-Tsai and Cox-Krenchel). The theoretical predictions based on the Halpin-Tsai equations showed a good agreement with the experimental data, whereas the model derived from Cox-Krenchel equations overestimated data.
机译：通过在发泡过程中将填充有铁颗粒的聚氨酯基质暴露于磁场中来制备增强泡沫。磁场导致铁颗粒沿磁场方向排列，从而产生类似于原纤维的柱状结构，如通过SEM和显微断层扫描3D重建所观察到的。由原纤维引起的各向异性增强改善了机械性能，在对准方向上弹性模量和屈服应力均增加了三倍，而在横向方向上观察到了较小的影响。在这种情况下，机械性能与无规则填充泡沫的机械性能相当，或者在某些情况下与未填充泡沫的机械性能相当。通过理论模型评估了原纤维的增强效率，该理论模型基于泡沫力学与两种用于对齐短纤维复合材料的微力学模型（Halpin-Tsai和Cox-Krenchel）的组合。基于Halpin-Tsai方程的理论预测与实验数据吻合良好，而从Cox-Krenchel方程得出的模型则高估了数据。

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