Development of In Situ Nanoscopic Dynamic Damage Analyzer

基于1)能够在受控环境(如真空、潮湿或干燥气体和/或液体)中对样品表面成像的环境原子力显微镜，2)能够以足够精度施加小变化载荷的微机械疲劳试验机，开发了原位纳米损伤分析仪。和3)环境舱。利用所开发的系统，可以在受控环境下，在动态加载下成功地对纳米级表面损伤进行原位评估。该系统中使用的原子力显微镜有一个压电式扫描仪、激光半导体和其他电路，这些电路都位于样品上，同时它们与环境或环境室完全隔离。因此，可以在受控环境(例如潮湿气体)中成功地执行样品表面的原子力显微镜成像，而无需将激光半导体和压电扫描器暴露在(潮湿)环境中。对于机械和疲劳测试，使用了电磁致动器，因此可以精确地将小载荷施加到微材料上，例如用于微机械的微型元件和高强度和高弹性模数的纤维。在本研究中，对前驱型高强高弹模数陶瓷纤维进行了单纤维拉伸和疲劳试验，并对纳米纤维的表面损伤进行了评估，验证了所开发系统的有效性。

In situ nanoscopic damage analyzer has been developed based upon 1) an environmental atomic force microscope capable of imaging sample surface in a controlled environment such as vacuum, humid or dry gases and/or liquids, 2) micromechanical fatigue testing machine capable of applying a small varying load with sufficient precision. and 3) an environmental chamber. By using the developed system, in situ nanoscopic surface damage can be successfully evaluated under a dynamic loading in a controlled environment. The atomic force microscope used in the system has a piezo scanner, laser semiconductor and other electric circuits all situated upon the sample, and at the same time they are fully isolated from the environment or environment chamber. Therefore, atomic force microscope imaging of the sample surface in a controlled environment such as humid gases can be successfully performed without the laser semiconductor and piezo scanner being exposed to (humid) environment. For mechanical and fatigue tests, an electro-magnetic actuator is used, and thereby a small load can be precisely applied to a micromaterial such as microelements used in micromachine and high-strength and high-elastic modulus fibers. In this investigation, the single fiber tensile and fatigue tests were conducted in precursor type high-strength and high-elastic modulus ceramic fibers, and nanoscopic fiber surface damage was evaluated, and the usefulness of the developed system has been demonstrated.