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Numerical and experimental investigation of out-of-plane fiber waviness on the mechanical properties of composite materials
International Journal of Material Forming ( IF 2.6 ) Pub Date : 2020-01-25 , DOI: 10.1007/s12289-020-01540-5
M. Thor , U. Mandel , M. Nagler , F. Maier , J. Tauchner , M. G. R. Sause , R. M. Hinterhölzl

The limited capability to predict material failure in composite materials and specifically in wavy composite layers has led to high margins of safety for the design of composite structures. Thus, the full lightweight potential of this class of materials is left unused. To understand the complex failure behavior of composite materials containing out-of-plane fiber waviness under compressive and tensile loading, a non-linear 2D material model was implemented in ABAQUS and validated with extensive experimental test data from compression and tensile tests. Each test was recorded by a stereo camera system for digital image correlation to resolve damage initiation and propagation in detail. This study has shown excellent agreement of numerical simulations with experimental data. In a virtual testing approach various parameters, i.e. amplitude, wavelength and laminate thickness, have been studied. It was found that the failure mode changed from delamination to kink shear band formation with increasing laminate thickness. The wavelength has shown minor influences compared to amplitude and laminate thickness.



中文翻译:

面外波纹度对复合材料力学性能的数值和实验研究

预测复合材料(尤其是波浪形复合材料层)中材料故障的能力有限,这导致复合结构设计的安全性很高。因此,此类材料的全部轻量化潜力未得到利用。为了了解包含面外纤维波纹的复合材料在压缩和拉伸载荷下的复杂破坏行为,在ABAQUS中实施了非线性2D材料模型,并使用来自压缩和拉伸试验的大量实验数据进行了验证。每个测试都由一个立体相机系统记录下来,以进行数字图像关联,以详细解决损坏的发生和传播。这项研究表明数值模拟与实验数据具有极好的一致性。在虚拟测试方法中,各种参数(即幅度,已经研究了波长和层压板厚度。结果发现,随着层压板厚度的增加,破坏模式从分层转变为扭折剪切带。与振幅和层压板厚度相比,波长显示出较小的影响。

更新日期:2020-01-25
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