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A study of the fracture mechanisms in pristine silica fibres utilising high speed imaging techniques

机译:利用高速成像技术研究原始二氧化硅纤维的断裂机理

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摘要

The 40 kg test masses of the Advanced LIGO interferometric gravitational wave detector will each be suspended on four fibres fabricated from Heraeus Suprasil synthetic silica glass. The ultimate tensile breaking stress and fracturing process of loaded silica fibres was investigated in order to develop the technology required to suspend the test mass in a robust and safe manner. The majority of the fibres in this study were pulled by hand in a H _2 - O _2 flame; for comparison, fibres were also pulled on a CO _2 laser machine. Carefully prepared fibres were shown to be pristine, i.e. free of surface cracks. Such fibres exhibited breaking strengths as high as 5 - 6 GPa. To analyse the mechanisms of fracture a high speed photographic setup was developed in addition to the use of a high speed video camera. The pristine fibres break in the zone of maximal stress as expected in the model of flawless fibres. Some fibres break at a lower stress and these fractures occur at the fibre ends. This type of fracture is related to the thermal stress induced by local heating which was used to align the fibre in the test structure. The most likely fracture mechanism is based on a thermo-kinetic approach.
机译:先进LIGO干涉重力波检测器的40千克测试质量将分别悬挂在用贺利氏Suprasil合成石英玻璃制成的四根纤维上。为了研究以坚固,安全的方式悬挂测试物料所需的技术,研究了负载二氧化硅纤维的极限拉伸断裂应力和断裂过程。本研究中的大多数纤维是在H _2-O _2火焰中用手牵拉的。为了进行比较,还将纤维在CO _2激光机上拉出。精心准备的纤维被证明是原始的,即没有表面裂纹。这样的纤维表现出高达5-6GPa的断裂强度。为了分析断裂的机理,除了使用高速摄像机外,还开发了高速照相装置。原始纤维在最大应力区域断裂,这是无瑕疵纤维模型所预期的。一些纤维在较低的应力下断裂,这些断裂发生在纤维末端。这种断裂与局部加热引起的热应力有关,该局部加热用于将光纤对准测试结构。最可能的断裂机理是基于热动力学方法。

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