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首页> 外文期刊>Composites >Determination of mode I & II strain energy release rates in composite foam core sandwiches. An experimental study of the composite foam core interfacial fracture resistance
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Determination of mode I & II strain energy release rates in composite foam core sandwiches. An experimental study of the composite foam core interfacial fracture resistance

机译：确定复合泡沫芯三明治中的I和II型应变能释放速率。复合泡沫芯界面抗断裂性能的实验研究

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The use of composite materials is on the rise in different engineering fields. Following this trend the wind turbine industry has adopted composites as their primary material of choice. For wind turbine blades having large unsupported functional aerodynamic surfaces; the structural stiffness is very important. Stiffness is required to keep the deformations to a minimum under aerodynamic forces. The blade is thus stiffened using sandwich structures at high strain locations within the structure. The lightweight foam cored sandwiches though add stiffness, at the same time pose a challenge for design as the difference in stiffness of both the face-plate and the foam core is very high. The resistance to fracture in any part of the structure is an important design parameter to be determined. The determination of fracture resistance quantified here as the Strain Energy Release Rate (SERR) poses some unique challenges when dealing with highly heterogeneous materials in terms of stiffness. In this study some approaches have been analyzed while others are developed to tackle this problem and to measure the Mode I & II SERR of the face-plate foam-core interface. The sandwich core varies in both thickness and density depending on the loading and thus the location along the blade length. However for this study we have used a single density of foam core for the most part of the turbine blade. Different thicknesses of the foam cores are used to determine the effect of scale on the calculated SERR. (C) 2016 Elsevier Ltd. All rights reserved.
机译：在不同的工程领域中，复合材料的使用正在增加。顺应这一趋势，风力涡轮机行业已采用复合材料作为首选材料。对于具有大的无支撑功能性空气动力学表面的风力涡轮机叶片；结构刚度非常重要。需要刚性以在空气动力的作用下将变形保持在最小。因此，使用夹层结构在结构内的高应变位置处使叶片变硬。轻质泡沫夹芯三明治虽然增加了刚度，但同时也给设计带来了挑战，因为面板和泡沫芯的刚度之差非常高。结构任何部分的抗断裂性是要确定的重要设计参数。当以刚度来处理高度异质的材料时，确定为抗拉强度的方法在这里量化为应变能释放率（SERR）带来了一些独特的挑战。在这项研究中，对一些方法进行了分析，同时开发了其他方法来解决此问题并测量面板泡沫-芯界面的I和II模式SERR。夹芯的厚度和密度都取决于载荷，并因此取决于沿叶片长度的位置。但是，在本研究中，我们对大部分涡轮叶片使用了单一密度的泡沫芯。泡沫芯的不同厚度用于确定水垢对计算出的SERR的影响。 （C）2016 Elsevier Ltd.保留所有权利。

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