Tensile behavior of unidirectional thick-Ply all-carbon hybrid laminates: a systematic experimental and numerical study

IF 5.3 Q2 MATERIALS SCIENCE, COMPOSITES Composites Part C Open Access Pub Date : 2024-04-21 DOI:10.1016/j.jcomc.2024.100462
Thomas Martinoni , Valentin Ott , Valter Carvelli , Giovanni Pietro Terrasi
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Abstract

Unidirectional long fiber reinforced polymers generally exhibit unfavorable abrupt and brittle failure under mechanical stresses without pre-warning which currently limits their use in safety critical applications. The lack of ductility of such composites can be overcome by interlayer hybridization where Low Strain (LS) material is sandwiched between High Strain (HS) material. This results in complex failure mechanisms, including multiple interacting damage modes, such as ply fragmentation and delamination. All-carbon unidirectional hybrid laminates with different layup sequences were designed and manufactured to study the pseudo-ductile behavior. An available analytical model was exploited to predict the damage scenarios of the laminates, both with stress-strain diagrams and damage mode maps. Tensile tests were carried out using different measurement and observation techniques including digital image correlation (DIC), embedded distributed fiber optic sensors (dFOS) and helicoidal X-ray computed tomography (CT). A finite element model was also developed to predict the damage mechanisms. Validated by experimental results, the numerical model was found to accurately predict the tensile damage modes and their evolution in the considered unidirectional thick ply all-carbon hybrid laminates.

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单向厚层全碳混合层压板的拉伸行为:系统实验和数值研究
单向长纤维增强聚合物通常会在机械应力作用下突然脆性失效,且没有预先警报,这限制了它们在安全关键应用中的使用。此类复合材料缺乏延展性的问题可以通过层间杂化来解决,即在高应变(HS)材料之间夹入低应变(LS)材料。这将导致复杂的破坏机制,包括多种相互作用的破坏模式,如层间碎裂和分层。为了研究伪韧性行为,我们设计并制造了具有不同铺层顺序的全碳单向混合层压板。利用现有的分析模型,通过应力应变图和损伤模式图来预测层压板的损伤情况。拉伸试验采用了不同的测量和观测技术,包括数字图像相关(DIC)、嵌入式分布式光纤传感器(dFOS)和螺旋 X 射线计算机断层扫描(CT)。此外,还开发了一个有限元模型来预测损坏机制。经实验结果验证,该数值模型能够准确预测所考虑的单向厚层全碳混合层压板的拉伸损伤模式及其演变。
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来源期刊
Composites Part C Open Access
Composites Part C Open Access Engineering-Mechanical Engineering
CiteScore
8.60
自引率
2.40%
发文量
96
审稿时长
55 days
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