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首页> 外文期刊>Journal of Materials Engineering and Performance >Fatigue Studies of Polyurethane Sandwich Structures
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Fatigue Studies of Polyurethane Sandwich Structures

机译：聚氨酯夹心结构的疲劳研究

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摘要

The fatigue characteristics of polyurethane foam-cored (PUF) composite sandwich structures were investigated using three-point bending tests carried out according to ASTM C 393. Three types of specimens (epoxy/glass-PUF-epoxy/glass, polyester/glass-PUF-polyester/glass, and epoxy/glass-PUF-polyester/glass) were considered for investigation. Experimental results indicate that degradation of stiffness occurs due to debonding and sliding between the skin and the foam during fatigue cycles. Epoxy/glass-PUF-epoxy/glass sandwich structures exhibit higher bending strength along with higher stiffness degradation than the other two types of sandwich panels, due to higher initial fatigue loading. The lowest fatigue properties have been obtained for the polyester/glass-PUF-polyester/glass sandwich panel specimens. Better performance of the epoxy/glass-PUF-epoxy/glass sandwich panels is most likely due to the superior properties of the outer thin skins. Most of the specimens fail within the foam region and not at the skin level. This situation is possibly due to debonding between the foam and the skin. The fatigue damage development in the foam and skin has been investigated using scanning electron microscopy.
机译：使用根据ASTM C 393进行的三点弯曲试验研究了聚氨酯泡沫芯（PUF）复合夹层结构的疲劳特性。三种类型的样品（环氧树脂/玻璃-PUF-环氧树脂/玻璃，聚酯/玻璃-PUF -聚酯/玻璃和环氧树脂/玻璃-PUF-聚酯/玻璃）用于研究。实验结果表明，由于疲劳周期中皮肤与泡沫之间的剥离和滑动，导致刚度下降。与其他两种类型的夹芯板相比，由于较高的初始疲劳载荷，环氧/玻璃-PUF-环氧/玻璃夹芯结构表现出更高的弯曲强度以及更高的刚度退化。对于聚酯/玻璃-PUF-聚酯/玻璃夹芯板样品，获得了最低的疲劳性能。环氧/玻璃-PUF-环氧/玻璃夹芯板的最佳性能是由于其外部薄皮的优越性能而引起的。大多数标本在泡沫区域内而不是在皮肤水平处失效。这种情况可能是由于泡沫与皮肤之间的剥离所致。使用扫描电子显微镜已经研究了泡沫和皮肤中疲劳损伤的发展。

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