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Fabrication of a new model hybrid material and comparative studies of its mechanical properties.

机译：一种新型混合材料的制备及其力学性能的比较研究。

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摘要

A novel aluminum foam-polymer hybrid material was developed by filling a 10 pore per inch (0.39 pores per millimeter), 7% relative density Duocel RTM open-cell aluminum foam with a thermoplastic polymer of trade name ElvaxRTM. The hybrid was developed to be completely recyclable and easy to process. The foam was solution treated, air quenched and then aged for various times at 180°C and 220°C to assess the effect of heat treatment on the mechanical properties of the foam and to choose the appropriate aging condition for the hybrid fabrication. An increase in yield strength, plateau height and energy absorbed was observed in peak-aged aluminum foam in comparison with underaged aluminum foam. Following this result, aluminum foam was utilized either at the peak-aged condition of 4 hrs at 220°C or in the as-fabricated condition to fabricate the hybrid material. Mechanical properties of the aluminum foam-polymer hybrid and the parent materials were assessed through uniaxial compression testing at static (e ≈ 0.008s-1) and dynamic (e ≈ 100s-1) loading rates. The damping characteristics of aluminum foam-polymer hybrid and aluminum foam were also obtained by compression-compression cyclic testing at 5 Hz. No benefit to the mechanical properties of aluminum foam or the aluminum foam-polymer hybrid was obtained by artificial aging to peak-aged condition compared to as-fabricated foam. Although energy absorption efficiency is not enhanced by hybid fabrication, the aluminum foam-polymer hybrid displayed enhanced yield stress, densification stress and total energy absorbed over the parent materials. The higher densification stress was indicative that the hybrid was a better energy absorbing material at higher stress than the aluminum foam. The aluminum foam was found to be strain rate independent unlike the hybrid where the visco-elasticity of the polymer component contributed to its strain rate dependence. The damping properties of both aluminum foam and the aluminum foam-polymer hybrid materials were found to be amplitude dependant with the hybrid material displaying superior damping capability.
机译：通过用商品名ElvaxRTM的热塑性聚合物填充每英寸10个孔（每毫米0.39个孔），相对密度7％的Duocel RTM开孔铝泡沫，开发了一种新型的泡沫铝聚合物混合材料。该混合动力车被开发为可完全回收利用且易于加工。对泡沫进行固溶处理，空气淬火，然后在180°C和220°C进行不同的时效，以评估热处理对泡沫力学性能的影响，并为混合制造选择合适的时效条件。与未老化的铝泡沫相比，在峰值老化的铝泡沫中观察到屈服强度，平台高度和吸收的能量增加。根据该结果，在220℃下4小时的峰值时效条件下或在加工条件下利用泡沫铝来制造杂化材料。通过在静态（e＆ap; 0.008s-1）和动态（e＆ap; 100s-1）加载速率下的单轴压缩测试，评估了泡沫铝-聚合物杂化物和母体材料的机械性能。还通过在5Hz下的压缩-压缩循环测试获得了泡沫铝-聚合物杂化物和泡沫铝的阻尼特性。与人造泡沫相比，通过人工老化至峰值时效条件对泡沫铝或泡沫铝-聚合物杂化物的机械性能没有益处。尽管通过混合制造不能提高能量吸收效率，但泡沫铝-聚合物杂化材料在母材上显示出更高的屈服应力，致密化应力和总能量吸收。较高的致密化应力表明，与铝泡沫相比，杂化材料在较高的应力下是一种更好的能量吸收材料。发现铝泡沫是与应变率无关的，而不同于杂化体，其中聚合物组分的粘弹性导致其应变率依赖性。发现铝泡沫和铝泡沫-聚合物杂化材料两者的阻尼特性都取决于振幅，并且杂化材料表现出优异的阻尼能力。

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  • 作者

    Cluff, Daniel Robert Andrew.;

  • 作者单位

    University of Waterloo (Canada).;

  • 授予单位 University of Waterloo (Canada).;
  • 学科 Engineering Mechanical.
  • 学位 M.A.Sc.
  • 年度 2007
  • 页码 157 p.
  • 总页数 157
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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