Creep and stress relaxation of unidirectional flax fiber reinforced laminates

蠕动 材料科学 粘弹性 复合材料 流变学 应力松弛 粘塑性 纤维增强塑料 放松(心理学) 玻璃纤维 压力(语言学) 纤维 本构方程 结构工程 有限元法 语言学 哲学 工程类 心理学 社会心理学
作者
Pio Michele Giuliani,Oliviero Giannini,Riccardo Panciroli
出处
期刊:Composite Structures [Elsevier BV]
卷期号:310: 116755-116755 被引量:7
标识
DOI:10.1016/j.compstruct.2023.116755
摘要

The growing demand for the use of biobased composites in different engineering and structural applications requires proper test methods and models to predict their long-term behavior. Assessing the creep resistance and relaxation effects in natural fiber-reinforced polymer (NFRP) laminates is of major interest, and reliable data are not yet available in the literature. To date, limited information is available on the creep resistance of composite materials based on natural fibers or biodegradable matrices. In the present work, the long-term behavior of flax fiber-based composites (FFRC), realized through Vacuum Assisted Resin Transfer Moulding (VARTM) technique is presented. The mechanical properties and the creep and relaxation behavior of unidirectional FFRCs under tensile stress at ambient temperature are investigated. The results highlight the role of viscoelastic (VE), viscoplastic, and pseudo-plastic components of the NFRPs’ mechanical response, unlike traditional composites (as glass and carbon FRP) whose response is generally approximated as linear-elastic. Moreover, starting from the experimental data, basic rheological models are implemented and utilized to replicate the stress–strain–time behavior of the FFPs. The limitations of VE rheological models in fitting the observed behavior of FFRPs are argued: A set of implementations highlights the need for more complex visco-elasto-plastic predictive models able to fit the measured stress–strain–time behavior of FFRC. Consequently, the need for robust methods to identify the large number of parameters associated to VP models arises.
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