• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国政府科技报告 >Application of Optical Methods, Including Optical Interference, to Measure the Dimensional Stability of Resins, Resin Based Adhesives and Resin Based Composites
【24h】

Application of Optical Methods, Including Optical Interference, to Measure the Dimensional Stability of Resins, Resin Based Adhesives and Resin Based Composites

机译：包括光学干涉在内的光学方法在树脂，树脂基粘合剂和树脂基复合材料尺寸稳定性测量中的应用

获取原文
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

As a consequence of osmosis during water uptake in the case of polycarbonates and as a consequence of osmosis followed by freezing of the aqueous solutions associated with osmosis in polyesters and epoxies, hairline cracks have been observed. The cracks are filled with water solution, and the small mismatch in acoustic impedance between polymer and water makes them extremely difficult to detect with ultrasound. Although the cracks are as much as a millimeter in lateral dimensions, the small separation between fracture surfaces and hence the small size of the crack volume makes for difficult detection by radiographic techniques. Specialised optical techniques, including rectified optics transmission microscopy and interferometry, appear to be the most satisfactory methods for their observation. These techniques have been used in the present studies and have permitted estimates to be made of the stress intensity factors at which hairline cracking occurs in each of the three polymers.

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