Utilizing numerical models to identify process-induced residual stresses in 3D woven carbon/epoxy composites
Utilizing numerical models to identify process-induced residual stresses in 3D woven carbon/epoxy composites
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DOI：
10.1088/1757-899x/406/1/012030
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
I. Tsukrov;Kostiantyn Vasylevskyi;B. Drach;H. Buntrock;T. Gross
中科院分区：
文献类型：
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作者：
I. Tsukrov;Kostiantyn Vasylevskyi;B. Drach;H. Buntrock;T. Gross
提出了一种试验-数值相结合的方法来评估三维编织碳/环氧复合材料中的残余应力。假设残余应力是由成分的热膨胀系数差异引起的。残余应力的影响是量化的钻盲孔的复合板和映射所产生的面内表面位移的数字图像相关和电子散斑干涉。然后使用复合材料的细观有限元模型来确定有效温降ΔTeff，其导致相同的钻孔预测。通过对该温降ΔTeff冷却的有限元模拟，给出了局部残余应力的分布
A combined experimental-numerical procedure is proposed to evaluate residual stresses in 3D woven carbon/epoxy composites. It is assumed that residual stresses are caused by the difference in thermal expansion coefficients of the constituents. The impact of residual stresses is quantified by drilling blind holes in the composite panels and mapping the resulting in-plane surface displacements by digital image correlation and electronic speckle pattern interferometry. Then mesoscale finite element models of the composite are used to determine the effective temperature drop ΔTeff that results in the same predictions for hole drilling. The local distributions of residual stress are given by the finite element simulations of the cooling by this temperature drop ΔTeff