Abstract
When In this study, uniaxial compression tests for synthetic quartz were carried out at quasi-static and dynamic rates to clarify the relationship between the luminous phenomena and the stress-strain curves. The intensity of light generated in the fracture of quartz was measured by a photodiode with photo-sensor amplifier. The fracture manners of quartz such as the number of fragments, the area of fracture surface and the volume of fragments were also examined. Even in the static test, dynamic response of load associated with fracture was precisely evaluated by the load cell apart from the specimen with taking account of unloading stress wave propagation. It was clearly found that the peaks in the signal record of light generated during the fracture of quartz correspond to the changing points of the slope on load-time curves. Especially, the largest peak was measured at the dramatic drop of the load due to the fracture of quartz. The total quantity of light from fracture surface generated in dynamic compression tests was greater than that observed in static tests because the finer fracture fragments collected after dynamic tests provides the wider area of the fracture surface than those in static tests.
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