石英玻璃管大量应用于化工、机械和光学等领域,但由于缺少精准有效的高温弹性模量评价手段,限制了其高温热应力分析和结构设计。最近发展起来的缺口环方法可测试玻璃管材的室温弹性模量,但其在高温下的应用因变形测量困难而鲜有报道。本研究利用相对法解决高温缺口环变形测量的难题,从而可以方便准确地计算出高温弹性模量。采用本方法测试石英玻璃管的弹性模量并探索其在室温至1200℃间的变化规律,发现在800℃时达到最大值87.20 GPa,而后缓慢下降,1100℃以后开始急剧下降。本研究显示用校正后的缺口环法测试石英玻璃管的高温弹性模量值准确、可靠,有望推广应用于评价其他脆性圆管材料的高温弹性模量。
Quartz glass tubes are widely used in chemical, mechanical, optical, and other fields, especially for the cases of high temperature. However, scarcity of evaluation techniques of elastic modulus at high temperature causes a barrier for analysis of thermal stress and structure design. Although a split ring method has been used at room temperature, its application at high temperature is scarcely reported due to the difficulty of the deformation meas-urement. In this study, a combination of the split ring method and relative method was utilized to solve deformation measurement problem, thus evaluating the elastic modulus of quartz glass tubes at various temperatures. The results indicate that the elastic modulus datum increases from room temperature to 800℃, reaches the peak value of 87.20 GPa at 800℃, and then gradually decreases, and then sharply decreases when temperature higher than 1100℃. These re-sults demonstrate that the quartz glass tube measurement by improved split ring method for determining high-temperature elastic modulus is accurate and reliable, which could be used to evaluate other brittle tubes at high temperature.
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