Identifying the distinct shear wrinkling behavior of woven composite preforms under bias extension and picture frame tests
Identifying the distinct shear wrinkling behavior of woven composite preforms under bias extension and picture frame tests
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DOI：
10.1016/j.compstruct.2017.11.033
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发表时间：
2018-02-01
影响因子：
6.3
通讯作者：
Ko, F. K.
中科院分区：
文献类型：
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作者：
Hosseini, A.;Kashani, M. H.;Ko, F. K.
对平纹编织复合材料预制件在偏置拉伸试验（BET）和相框试验（PFT）下的剪切起皱行为进行了分析-实验研究。与BET相比，PFT中有意诱导的张力在很大一部分文献中被认为是织物起皱起始延迟的来源。然而，通过这项研究表明，即使纱线中的张力水平保持为零，纱线内的剪切-称为纱线内剪切-也可能是PFT延迟起皱的另一个原因。为了更好地解释这一假设，已经开发了一个分析模型，并比较了BET和PFT中皱纹形成的中观水平性质。在这些表征试验中，给出了预测织物锁紧和起皱发生的解析方程，并在碳纤维平纹机织物上进行了实验验证。
An analytical-experimental study of the shear wrinkling behavior of plain woven composite preforms under bias extension test (BET) and picture frame test (PFT) is presented. The intentionally induced tension in the PFT has been regarded in a large portion of the literature as the source of delay in fabric wrinkling initiation as compared to the BET. Through this study, however, it is demonstrated that shear within yarns - known as intra-yarn shear-could be another cause of the delayed wrinkling in the PFT, even when the tension level in yarns is kept at zero. To better explain this hypothesis, an analytical model has been developed and the meso-level nature of wrinkle formation in the BET and PFT is compared. Analytical equations are provided to predict both the fabric locking and wrinkling onsets under these characterization tests, and verified experimentally on a carbon fiber plain woven fabric.