期刊
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
卷 141, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesa.2020.106204
关键词
Biocomposite; Environmental degradation; Mechanical properties; Creep
资金
- Bio Based Industries Joint Undertaking under the European Union's Horizon 2020 research and innovation program [744349 SSUCHY]
This study investigates the influence of stress level and hygrothermal conditions on the creep/recovery behavior of high-grade composites made from GreenPoxy, flax, and hemp fibers. The results show that strains increase with applied load and environment severity, with higher time-delayed strains in the creep phase than the recovery phase. Additionally, a stiffening effect is observed during the recovery phase.
This paper investigates the influence of the stress level and hygrothermal conditions on the creep/recovery behaviour of three high-grade composites made of GreenPoxy and flax and hemp fibres. The results show that the levels of instantaneous, time-delayed and residual strains increase with the applied load and the severity of the environment. The time-delayed strains of the materials are higher in the creep phase than in the recovery phase. A stiffening effect is also observed during the recovery phase. The post-creep viscoelastic properties are then identified using an anisotropic viscoelastic law from the recovery function. The relaxation time function is independent of the stress level and the environmental conditions. The viscous parameter varies with the stress level and increases substantially with severe environmental conditions. The dependence of the creep/recovery behaviour on the stress level is due to the dependence of the stiffening phenomenon and irreversible mechanisms rather than to the viscoelastic behaviour.
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