Influence of moisture uptake on the static, cyclic and dynamic behaviour of unidirectional flax fibre-reinforced epoxy laminates

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• 作者：Michaë ; l Berges^a ; Romain Lé ; ger^a ; Vincent Placet^b ; ^{vincent.placet@univ-fcomte.fr" class="auth_mail" title="E-mail the corresponding author} ; Vé ; ronique Person^c ; Sté ; phane Corn^a ; Xavier Gabrion^b ; Jé ; rô ; me Rousseau^c ; Emmanuel Ramasso^b ; Patrick Ienny^a ; Sté ; phane Fontaine^c
• 关键词：A. Polymer-matrix composites ; A. Natural fibres ; B. Mechanical properties ; C. Moisture
• 刊名：Composites Part A: Applied Science and Manufacturing
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：88
• 期：Complete
• 页码：165-177
• 全文大小：5032 K

文摘

This papers aims to characterize the influence of moisture uptake on the mechanical behaviour of unidirectional flax fibre-reinforced epoxy laminates. Monotonic and cyclic tensile tests and free vibration characterization are carried out. Results show that UD flax-epoxy composites, when exposed to hygrothermal conditioning at 70 °C and 85% RH, exhibit a diffusion kinetic which follows a one dimensional Fickian behaviour. The mass uptake at equilibrium is approximately 3.3% and the diffusion coefficient 6.5 × 10⁻⁶ m² s⁻¹. Water vapour sorption is shown to induce a significant change in the shape of the tensile stress-strain curve, a decrease in the dynamic elastic modulus of about 20% and a 50% increase in the damping ratio. Contrary to all expectations, water saturation does not degrade the monotonic tensile strength of such a flax-epoxy composites and leads to an increase in the fatigue strength for a high number of cycles.