| 李艳萍,袁康博*,谭学明.隔热涂层应用于高温SHPB实验的可行性分析[J].实验力学,2023,38(1):57~67 |
| 隔热涂层应用于高温SHPB实验的可行性分析 |
| Feasibility analysis of applying thermal insulation layers in high-temperature SHPB tests |
| 投稿时间：2022-02-24 修订日期：2022-04-25 |
| DOI：10.7520/1001-4888-22-045 |
| 中文关键词: SHPB 高温 高应变率 隔热涂层 可行性 |
| 英文关键词:SHPB high temperature high strain rate thermal insulation layer feasibility |
| 基金项目:国家自然科学基金项目(12072287， 11872051); 中央高校基本科研业务费专项资金(2022ZYGXZR057) |
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| 中文摘要: |
| 在分离式Hopkinson压杆(SHPB)高温实验中，对弹性杆端和试样的温度进行控制，避免弹性杆端的过大温升和试样温度的过度下降，是保证实验结果准确性的关键。基于傅里叶导热定律，本文提出在试样与弹性杆间插入特定结构的隔热涂层来降低弹性杆与试样、高温炉之间的热交换效率，从而将弹性杆端和试样的温度控制在允许范围内。从理论分析着手，设计了一种可用于高温SHPB实验的隔热涂层，并通过数值模拟和实验对该方法进行了验证。结果表明：此隔热涂层在高温下强度大幅退化，在400℃以上时，可将其近似看作试样与弹性杆间的一段空隙，忽略其对试样加载的影响。在600℃实验环境下，弹性杆端温度最高达到167℃，试样平均温度下降2.24%。在400℃和600℃下分别采用本文实验方法和高温同步快速组装法对45钢进行加载，所得结果具有良好的一致性，表明本文方法合理可行。 |
| 英文摘要: |
| For Split Hopkinson Pressure Bar (SHPB) tests at high temperatures, controlling the temperature of the elastic bar ends and specimen to avoid the excessive temperature rise of elastic bars and excessive temperature drop of the specimen is significant to ensure the accuracy of experimental results. Based on Fourier's Law, an idea of inserting thermal insulation layers with a specific structure between the elastic bars and specimen is proposed to reduce the heat exchange efficiency of elastic bars/furnace and elastic bars/specimen. Thus the temperature of elastic bar ends and the specimen can be controlled within allowable range. In this paper, a kind of thermal insulation layer that can be used in high-temperature SHPB experiments were designed. The proposed method is verified by numerical simulations and experiments. The results indicate that the strength of the thermal insulation layer was degraded sharply above 400℃. Thus the thermal insulation layer can be regarded as a gap between specimen and elastic bar. As a result, the effects of inserting thermal insulation layer on stress wave propagation can be ignored. For a test conducted at 600℃, the temperature at the end of elastic bars were kept below 167℃, and the average temperature of the specimen decreased 2.24%. The stress-strain curves of 45 steel at 400℃ and 600℃ obtained by this method agree with that obtained by Rapid assembly technique, which demonstrates the feasibility of the proposed method. |
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