Modeling the viscoelastic compaction response of 3D woven fabrics for liquid composite molding processes
Modeling the viscoelastic compaction response of 3D woven fabrics for liquid composite molding processes
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DOI：
10.1177/0731684417707263
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发表时间：
2017-04
影响因子：
3.1
通讯作者：
K. Khan;R. Umer
中科院分区：
文献类型：
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作者：
K. Khan;R. Umer
在复合材料液态成型工艺中，纤维增强材料的压实特性在确定厚度、纤维体积含量和零件形状方面起着关键作用。本研究提出了详细的实验和建模工作，研究三种不同类型的3D编织碳纤维增强材料，即正交，角联锁，和层到层，每个具有不同的编织风格和z-粘合剂纱线图案的粘弹性压实响应。对于所有的增强体，单步，多步和循环压实实验进行。一个非线性粘弹性模型，占大变形和粘性效应，捕捉各种加载历史下的材料的响应。模型验证也提出了捕捉每个响应与单独的材料参数集。还进行了参数研究，以分析模型参数对不同类型的负载的响应的作用。X射线计算机断层扫描分析表明，通过增强材料的厚度，z-粘合剂纱线发生了显著的永久变形。模拟结果与实验数据的比较表明，该模型是能够捕捉多个压实循环后的应力衰减，但需要进一步的调查，以预测完整的循环滞后。然而，模型结果同意相当好的单次和多步压实加载。
In liquid composite molding processes, the compaction characterization of fibrous reinforcements plays a key role in determining the thickness, fiber volume content, and part shape. This study presents detailed experimental and modeling work to study the viscoelastic compaction response of three different types of 3D woven carbon fiber reinforcements, namely, orthogonal, angle interlock, and layer-to-layer, each having a different weave style and z-binder yarn pattern. For all reinforcements, single-step, multistep and cyclic compaction experiments were conducted. A nonlinear viscoelastic model is presented that accounts for large deformations and viscous effects, to capture the response of the material under various loading histories. Model verification is also presented to capture each response with separate sets of material parameters. Parametric studies are also performed to analyze the role of model parameters on the response of different types of loadings. X-ray computed tomography analysis showed significant permanent deformation of z-binder yarns through the thickness of the reinforcements. The comparison of modeling results with the experimental data show that the model is able to capture the stress decay after multiple compaction cycles, yet needs further investigations to predict complete cyclic hysteresis. However, model results agree reasonably well with the single and multistep compaction loading.