Towards optimisation of load-time conditions for producing viscoelastically prestressed polymeric matrix composites

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• 作者：Bing Wang ; Kevin S. Fancey ; ^{k.s.fancey@hull.ac.uk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：A. Fibres ; A. Polymer-matrix composites (PMCs) ; B. Impact behaviour ; D. Mechanical testing ; Viscoelasticity
• 刊名：Composites Part B: Engineering
• 出版年：2016
• 出版时间：15 February 2016
• 年：2016
• 卷：87
• 期：Complete
• 页码：336-342
• 全文大小：1078 K

文摘

A viscoelastically prestressed polymeric matrix composite (VPPMC) is produced by applying a tensile creep load to polymeric fibres, the load being released before the fibres are moulded into a polymeric matrix. The viscoelastically recovering fibres induce compressive stresses within the matrix, which can improve mechanical properties by up to 50%. This study investigates the feasibility of reducing the creep loading period for VPPMC production. By using nylon 6,6 fibres, we have demonstrated that the previously adopted viscoelastic creep strain, requiring 330 MPa for 24 h, can be achieved over a shorter duration, t_n, using increased creep stress. Thus t_n was 92 min at 460 MPa and 37 min at 590 MPa. Subject to avoiding fibre damage however, it may be possible to reduce t_n further. From the three creep settings, elapsed recovery strain values were similar, as were the Charpy impact test data from corresponding VPPMC samples; i.e. there were no significant differences in impact energy absorption, these being ∼56% greater than their control (unstressed) counterparts.