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首页> 外文期刊>Journal of Volcanology and Geothermal Research >Welding: insights from high-temperature analogue experiments
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Welding: insights from high-temperature analogue experiments

机译：焊接：高温模拟实验的见解

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The rheological behavior of pyroclastic deposits during welding is incompletely understood and is based on a surprisingly small number of experimental studies. Here we present results from a new experimental apparatus comprising an automated uniaxial compression load frame that can run constant load (up to 1150 kg) or constant displacement rate (10~(-6) to 0.25 cm/s) tests at elevated temperatures ( ≤ 1100℃). Deformation experiments were performed on pre-fabricated cylinders (4.5 cm diameter, ～6 cm length) of soda lime silica glass beads (N=32), sintered rhyolite ash (N=7) and cores of pumiceous rhyodacite (N=6). Experimental runs used strain rates from 10~(-5) to 10~(-3)s~(-1) and stresses of ～0 to 5.24 MPa. Temperatures varied from 535 to 650℃ for experiments on soda lime silica glass beads and 825 to 950℃ for natural materials. In all cases experimental cores showed a strain-dependent rheology that is more strongly affected by temperature than by load or strain rate. Results from these experiments are used to develop a relationship in which the effective viscosity (η_e) of the experimental cores is predicted by: η_e=η_oexp~(-5.3((φ_f)/(1-φ_f))) where η_0 is melt viscosity and of is sample porosity. This rheological model provides a means for exploring the relative roles of emplacement temperature, load and glass transition temperature in welding of pyroclastic deposits.
机译：焊接过程中火山碎屑沉积物的流变行为尚不完全清楚，并且基于数量惊人的实验研究。在这里，我们介绍了一种新的实验设备的结果，该设备包括一个自动单轴压缩负载框架，该框架可以在高温（≤≤ 1100℃）。在预制圆柱（直径4.5厘米，长度约6厘米）（苏打石灰硅玻璃珠（N = 32），流纹岩烧结灰（N = 7）和球状流纹岩的芯（N = 6）上进行了变形实验。实验运行中使用的应变率为10〜（-5）到10〜（-3）s〜（-1），应力为〜0到5.24 MPa。在钠钙硅玻璃珠上进行的实验温度范围为535至650℃，对于天然材料，温度在825至950℃之间。在所有情况下，实验堆芯均显示出应变相关的流变特性，其受温度的影响比受载荷或应变率的影响更大。这些实验的结果用于建立一种关系，其中通过以下公式预测实验芯的有效粘度（η_e）：η_e=η_oexp〜（-5.3（（φ_f）/（1-φ_f））））其中η_0是熔体粘度并且是样品孔隙率。该流变模型提供了一种方法，用于探索在碎屑沉积物的焊接中放置温度，载荷和玻璃化转变温度的相对作用。

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