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Time Dependent Characteristics and Long-term Reliability of PMC in Hostile Environment

恶劣环境下 PMC 的时变特性和长期可靠性

基本信息

批准号：
18560088
负责人：
KAWADA Hiroyuki
金额：
$ 2.39万
依托单位：
Waseda University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2006
资助国家：
日本
起止时间：
2006 至 2007
项目状态：
已结题

项目摘要

Polymer matrix composites(PMC) such as Fiber Reinforced Plastics(FRP) have numerous variations in its components, and therefore it is possible to design its mechanical properties corresponding to its application. Previous researches dealing long-term reliability of FRP in corrosive environment mostly focus on macroscopic damage failure such as crack propagation and mechanical properties degradation, but not on its failure mechanism. The failure of FRP occurs from the accumulation of microscopic damage in its components. Thus present research focus on microscopic damage such as degradation in mechanical properties of resin matrix, strength degradation of fiber reinforcement, and interfacial degradation, and furthermore, evaluated these degradation behavior quantitively.Firstly, neat matrix resin specimen was immersed in Deionized water and was statically〜in air to measure its mechanical properties such as stiffness and rupture strain. The stiffness remained unchanged but the rupture str … More ain increased in vicinity of immersion.Secondly, E-glass fiber was embedded in the epoxy resin to mold Single Fiber Composite(SFC) specimen. Constant strain test of SFC specimen was conducted under water environment(40, 75[℃]. Fragmentation test was conducted after the constant strain test to estimate fiber residual strength. It was clarified that the fiber strength degrades by constant strain test, and the degradation accelerates with higher applied strain, immersion time, and higher water temperature. Furthermore subcritical crack growth model was applied to predict the fiber strength degradation.Finally, the length of interfacial debonding accompanied with embedded fiber failure was measured to estimate the maximum shear strength. Also, from the energy balance in vicinity of fiber failure, Energy Release Rate(ERR) was quantified. Wagner's model and Morais's model were applied to estimate maximum shear strength and ERR. It was clarified that both values degrades and showed a tendency to saturation. Less

聚合物基复合材料（PMC）如纤维增强塑料（FRP）在其组分中具有许多变化，因此可以根据其应用设计其机械性能。以往对FRP在腐蚀环境中长期可靠性的研究主要集中在宏观损伤失效方面，如裂纹扩展和力学性能退化等，而对其失效机理研究较少。FRP的失效是由其构件中微观损伤的累积引起的。因此，目前的研究主要集中在树脂基体力学性能退化、纤维增强体强度退化和界面退化等微观损伤方面，并对这些退化行为进行定量评价。首先，将基体树脂试样浸泡在去离子水中，在空气中静态放置，测量其刚度和断裂应变等力学性能。刚度保持不变，但断裂应力 ...更多信息其次，将无碱玻璃纤维埋入环氧树脂中，制成单纤维复合材料（SFC）试件。在水环境（40、75[℃]）下进行SFC试样的恒定应变试验。在恒定应变测试之后进行破碎测试以估计纤维剩余强度。结果表明，恒定应变试验使纤维强度下降，且随着应变的增大、浸泡时间的延长和水温的升高，纤维强度下降的速度加快。最后，通过测量界面脱粘长度并结合嵌入纤维的破坏，估算了复合材料的最大抗剪强度。此外，从纤维失效附近的能量平衡，量化能量释放率（ERR）。采用瓦格纳模型和Morais模型估算最大抗剪强度和错误率。澄清的是，这两个值都降低，并显示出饱和的趋势。少