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Mechanical degradation of foam-cored sandwich materials exposed to high moisture

机译：暴露于高水分的泡沫芯夹芯材料的机械降解

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摘要

Sandwich specimens composed of E-glass/polyester face sheets bonded to a PVC foam core were exposed to high moisture (95% RH) and immersed in sea-water for extended periods of time. Degradation of mechanical properties of the face sheets, foam core and face/core interface were progressively evaluated using flexural testing of the laminates, through-thickness tension of the foam core and interfacial sandwich DCB fracture testing. Testing reveals substantial flexural stiffness and strength reductions for the laminated composites, and only minor reduction in the tensile stiffness and strength of the foam. Degradation of the interfacial face/core fracture toughness is weak for specimens subjected to elevated moisture and more pronounced for sandwich specimens immersed in sea-water. After 30 days of exposure to high moisture, foam damage is visible in the form of cracks and pits on the cell walls. Optical examinations of expansional strains show that moisture absorbed by the foam penetrates only about to 2-3 mm from the core free surface for the 95% RH condition, while penetrates deeply for the immersed condition.
机译：将由E玻璃/聚酯面板粘合到PVC泡沫芯上制成的三明治样品暴露在高湿气（相对湿度95％）中，并长时间浸泡在海水中。使用层压材料的挠曲测试，泡沫芯的全厚度张力和界面夹层DCB断裂测试逐步评估了面板，泡沫芯和面/芯界面的机械性能的下降。测试表明，层压复合材料的挠曲刚度和强度都有很大降低，而泡沫的拉伸刚度和强度仅有很小的降低。对于水分含量较高的试样，界面/芯部断裂韧性的降低较弱，而浸入海水中的夹心试样则更为明显。暴露于高湿环境下30天后，泡沫破裂的现象可见于细胞壁上的裂缝和凹坑。膨胀应变的光学检查表明，在95％RH条件下，泡沫吸收的水分仅从芯自由表面渗透约2-3 mm，而在浸入条件下则渗透较深。

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  • 来源
    《Composite Structures》 |2009年第1期|122-129|共8页
  • 作者

    F. Aviles; M. Aguilar-Montero;

  • 作者单位

    Centra de Investigation Cientifica de Yucatan, AC, Unidad de Materiales, Calle 43 # 103, Col. Chuburna de Hidalgo, 97200 Merida, Yucatan, Mexico;

    Centra de Investigation Cientifica de Yucatan, AC, Unidad de Materiales, Calle 43 # 103, Col. Chuburna de Hidalgo, 97200 Merida, Yucatan, Mexico;

  • 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

    moisture absorption; sea-water; sandwich; mechanical degradation; PVC foam;

    机译：吸湿性海水;三明治;机械降解;PVC泡沫;

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