• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >Osmotic Cracking in Unsaturated Polyester Matrices Under Humid Environment
【24h】

Osmotic Cracking in Unsaturated Polyester Matrices Under Humid Environment

机译：潮湿环境下不饱和聚酯基体的渗透裂纹

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Glass fiber reinforced polyester composites are widely used in marine applications where they may undergo chemical and physical aging. For this kind of laminates, the durability is governed mainly by the matrix degradation. The mechan- ical property reduction is not iriduced only by hydrolytic aging but rather by the formation of cracks or blisters. That is the reason why it became of major interest to understand the microcrack nucleation mechanism in neat matrices, to study the crack propagation, and to evaluate the incidence of cracking on the tensile property loss. We first put forward a nucleation mechanism based on polyester-organic molecule phase separation, and drew a simple kinetic model to take into account the existence of a crack induction time that is dependent on temperature and matrix structure. Crack propa- gation results from the build up of an osmotic pressure in microcavities, which is proportional to solute concentration. This second step has been studied in terms of crack density evolution and crack propagation rate. Finally, there is a good correlation between tensile mechanical properties variation and crack parameters.
机译：玻璃纤维增​​强的聚酯复合材料广泛用于可能经受化学和物理老化的海洋应用。对于这种层压板，耐久性主要取决于基质的降解。机械性能的降低不仅是由于水解时效引起的，而是由于裂纹或水泡的形成而引起的。这就是为什么人们对了解纯基质中的微裂纹成核机理，研究裂纹扩展以及评估裂纹对拉伸性能损失的影响之所以成为主要兴趣的原因。我们首先提出了一种基于聚酯-有机分子相分离的成核机理，并绘制了一个简单的动力学模型来考虑裂纹诱导时间的存在，该时间取决于温度和基体结构。裂纹的传播是由于微腔内渗透压的升高而引起的，渗透压与溶质浓度成正比。已从裂纹密度的演变和裂纹扩展速率方面研究了第二步。最后，拉伸机械性能变化与裂纹参数之间具有良好的相关性。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号