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High cycle fatigue under reversed bending of sandwich panels with GFRP skins and polyurethane foam core

机译：具有GFRP蒙皮和聚氨酯泡沫芯的夹芯板反向弯曲时的高周疲劳

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摘要

The effect of fully reversed loading (R =-1) on high cycle fatigue performance of sandwich panels composed of polyurethane foam core and Glass Fiber Reinforced Polymer (GFRP) skins is studied and compared to that of similar panels tested under fully unloaded (R=0) conditions. Fatigue life curves are established and compared based on maximum loads of 30-70% of the ultimate monotonic strength (P_(ult)). It was shown that panels consistently fail in shear of the foam core. The fatigue life reduces significantly at R =-1, to about 10% of that at R = 0. In order to achieve at least 2 million cycles-the commonly acceptable fatigue life in structural engineering-the maximum service loads should be limited to 30% and 45% of P_(ult), respectively, for the cases of R =-1 and R = 0. It is estimated that the threshold loading levels at infinite fatigue life are 23% and 37% of P_(ult), for the cases of R =-1 and R = 0, respectively. By the end of fatigue life, up to 25% reduction in stiffness occurs. The transition between high and low cycle fatigue occurs between 200 and 5000 cycles. A 3-D Haigh diagram is also established for design purposes.
机译：研究了完全反向加载（R = -1）对由聚氨酯泡沫芯和玻璃纤维增​​强聚合物（GFRP）蒙皮组成的夹芯板的高周疲劳性能的影响，并将其与在完全未加载的情况下进行测试的类似板的对比（R = 0）条件。建立疲劳寿命曲线并根据最大单调强度（P_（ult））的30-70％的最大载荷进行比较。结果表明，面板始终无法破坏泡沫芯。在R = -1时，疲劳寿命显着降低，约为R = 0时的疲劳寿命的10％。为了实现至少2百万次循环-结构工程中通常可接受的疲劳寿命-最大使用载荷应限制为30对于R = -1和R = 0，分别为P_（ult）的％和45％。据估计，对于无限疲劳寿命，阈值载荷水平为P_（ult）的23％和37％。 R = -1和R = 0的情况分别。疲劳寿命结束时，刚度降低多达25％。高循环疲劳和低循环疲劳之间的过渡发生在200至5000个循环之间。还出于设计目的建立了3-D Haigh图。

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  • 来源
    《Composite Structures》 |2014年第7期|31-39|共9页
  • 作者

    Hale Mathieson; Amir Fam;

  • 作者单位

    Department of Civil Engineering, Queen's University, Canada;

    Engineering and Applied Science, Department of Civil Engineering, Queen's University, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Fatigue; Sandwich panel; Foam core; FRP skin; Reversed loading;

    机译：疲劳;夹心板;泡沫芯层;玻璃钢皮;反向加载;

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