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首页> 外文期刊>Journal of Sandwich Structures and Materials >Failure behaviour of grid-scored foam cored composite sandwich panels for wind turbine blades subjected to realistic multiaxial loading conditions
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Failure behaviour of grid-scored foam cored composite sandwich panels for wind turbine blades subjected to realistic multiaxial loading conditions

机译：网格叶片泡沫芯复合夹芯板在风力涡轮机叶片上的失效行为

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摘要

The load response and failure behaviour of 'grid-scored' sandwich panels used in wind turbine blades have been investigated. This paper presents the results of a combined experimental and numerical investigation of the load response and failure behaviour of a specific grid-scored foam cored composite sandwich panel configuration subjected to multiaxial quasi-static loading conditions that are representative for realistic loading conditions present in wind turbine blades. From the experimental evidence a criterion based on fracture mechanics has been proposed for predicting the onset of fracture in the resin grid. The criterion can be applied directly in conjunction with finite element modelling based on 3D solid elements where the resin grid in situ the core is fully modelled. However, since most full-scale blade models are based on first-order shear deformation theory where the core properties normally are homogenised a strain-based failure criterion is also proposed. The input for this failure criterion is the allowable resin grid strain, which can be obtained from a simple uniaxial tension test of a grid-scored sandwich beam specimen. The predictions of the criteria have been compared with the experimental observations, and a good correlation has been found.
机译：已经研究了风力涡轮机叶片中使用的“网状”夹心板的载荷响应和破坏行为。本文介绍了组合的实验和数值研究的结果，该试验研究了特定格形泡沫芯复合夹芯板结构在多轴准静态载荷条件下的载荷响应和破坏行为，这些载荷代表了风力涡轮机中的实际载荷条件刀片。根据实验证据，提出了一种基于断裂力学的判据，用于预测树脂网格中断裂的发生。该标准可以直接与基于3D实体元素的有限元建模结合应用，其中对树脂网格原位进行了完全建模。但是，由于大多数全尺寸叶片模型都是基于一阶剪切变形理论，在该理论中，通常将铁心特性均匀化，因此提出了基于应变的破坏准则。该破坏标准的输入是允许的树脂网格应变，该应变可以通过对网格计分的夹心梁样本进行简单的单轴拉伸试验获得。该标准的预测已与实验观察进行了比较，并且发现了良好的相关性。

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