Residual stress reduction during composite manufacturing through cure modification: In situ analysis
Residual stress reduction during composite manufacturing through cure modification: In situ analysis
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DOI：
10.1177/00219983211066545
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发表时间：
2022-01
影响因子：
2.9
通讯作者：
S. Chava;S. Namilae;M. Al-Haik
中科院分区：
文献类型：
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作者：
S. Chava;S. Namilae;M. Al-Haik
残余应力对复合材料结构是有害的，因为它们会引起脱粘、分层和基体开裂等加工缺陷，从而显著降低复合材料的承载能力。在本研究中，采用一种新的原位数字图像相关方法来分析固化周期修改对加工过程中残余应力演变的影响。结果表明，胶凝后突然冷却的改进固化循环可降低残余应力。研究了五种不同的铺层结构，考察了纤维方向的影响。平衡非对称[30/-30/60/-60]层合板最大平均残余应力降低31.8%。残余应力的减小使不同层位的破坏强度增加了4% ~ 12%，并可使首层破坏强度增加22%。
Residual stresses are detrimental to composite structures as they induce processing defects like debonding, delamination, and matrix cracking which significantly decrease their load-bearing capability. In this research, a new in-situ approach using digital image correlation is utilized to analyze the effect of the cure cycle modification on residual stress evolution during processing. It was found that the modified cure cycle comprising abrupt cooling after gelation reduces the residual stresses. Five different layup configurations are investigated to examine the effect of fiber direction. A maximum average residual stress reduction of 31.8% is observed for the balanced unsymmetric [30/-30/60/-60] laminate. The residual stress reduction results in an increase in failure strength between 4 and 12% in the different layups and can lead up to a 22% increase in first-ply failure strength.