基于细观结构的阴极炭块钠膨胀应力数值分析及实验验证

doi:10.11901/1005.3093.2016.577

材料研究学报

2017, Vol. 31

Issue (9): 703-713 DOI: 10.11901/1005.3093.2016.577

研究论文

本期目录 | 过刊浏览

基于细观结构的阴极炭块钠膨胀应力数值分析及实验验证

刘庆生(

), 曾少军, 张丹城

江西理工大学冶金与化学工程学院赣州 341000

Numerical Analysis in Mesoscopic Scale and Experimental Verification for Sodium Expansion Induced Stress of Cathode Carbon Blocks

Qingsheng LIU(

), Shaojun ZENG, Dancheng ZHANG

Falculty of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology, Ganzhou 341000, China

引用本文:

刘庆生, 曾少军, 张丹城. 基于细观结构的阴极炭块钠膨胀应力数值分析及实验验证[J]. 材料研究学报, 2017, 31(9): 703-713.
Qingsheng LIU, Shaojun ZENG, Dancheng ZHANG. Numerical Analysis in Mesoscopic Scale and Experimental Verification for Sodium Expansion Induced Stress of Cathode Carbon Blocks[J]. Chinese Journal of Materials Research, 2017, 31(9): 703-713.

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摘要:

在细观层面上将阴极炭块视为由骨料和粘结剂组成的二相复合材料,应用蒙特卡洛方法建立二维随机骨料模型,使用ANSYS 有限元软件的热分析模块求解钠膨胀应力模型,对不同形状、级配、含量的骨料模型的钠膨胀应力进行了数值模拟。结果表明：阴极炭块细观结构的非均匀性造成钠膨胀应力的不均匀分布,特别是拉应力集中导致阴极炭块破损;级配0.003~0.015 m炭骨料钠膨胀量最小,级配0.003~0.006 m炭骨料钠膨胀量最大,骨料含量80%钠膨胀量最小,骨料含量60%钠膨胀量最大。该模型的数值模拟结果与实验结果基本相符,表明该模型描述的钠膨胀和应力分布是合理和有效的,可以作为研究阴极炭块钠膨胀应力性能的一种有效辅助手段。

关键词 ：材料科学基础学科, 钠膨胀应力模型, 数值模拟, 阴极炭块, 细观结构

Abstract：

The cathode carbon block was regarded as a two-phase composite material composed of aggregates and binder in mesoscopic scale, for description of which, a two-dimensional random aggregate model was established by Monte Carlo method. Then the numerical simulation of sodium expansion induced stress of aggregate model was established by the thermal analysis module of ANSYS finite element software in consideration of different shapes, gradations and contents of the aggregate. The results show that the nonuniformity of the meso-structure in the cathode carbon block causes the nonuniform distribution of the stress induced by the sodium expansion. Particularly, the presence of the tensile stress can lead to the damage of the cathode carbon block. The sodium expansion of the carbon blocks with the carbon aggregate within the gradation of 0.003-0.015 m is the lowest, while those within the gradation of 0.003-0.006 m is the highest. The sodium expansion of the carbon block with 80% carbon aggregate is the lowest, while that with 60% carbon aggregate is the highest. The numerical simulation results are in accordance with the experimental results,which means that this model can reasonably and effectively describe the sodium expansion and stress distribution of the carbon block. Thus it can be used as an effective auxiliary way to study phenomena related with the sodium expansion induced stress.

Key words： foundation discipline in materials science model of sodium expansion stress numerical stress numerical simulation cathode carbon block meso-structure

收稿日期: 2016-09-30

ZTFLH:

TF821

基金资助:国家自然科学基金(51264011, 51564019)

作者简介:

作者简介刘庆生,男,1975年生,副教授,博士

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https://www.cjmr.org/CN/10.11901/1005.3093.2016.577 或 https://www.cjmr.org/CN/Y2017/V31/I9/703

表1 不同骨料模型的控制参数

图1 模型2有限元网格划分

图2 初始边界条件示意图

表2 阴极炭块材料参数

表3 钠膨胀系数

图3 单个骨料的膨胀应力分布图

图4 不同形状骨料模型的钠浓度分布3600 s

图5 不同形状骨料模型Y方向的膨胀位移10800 s

图6 不同形状骨料模型X方向的应力分布10800 s

图7 不同形状骨料模型Y方向的应力分布10800 s

图8 不同形状骨料模型的膨胀位移和应力曲线

图9 不同级配骨料模型的钠浓度分布3600 s

图10 不同级配骨料模型Y方向的膨胀位移10800 s

图11 不同级配骨料模型X方向的应力分布10800 s

图12 不同级配骨料模型Y方向的应力分布10800 s

图13 不同级配骨料模型的膨胀位移和应力曲线

图14 不同含量骨料模型的钠浓度分布3600 s

图15 不同含量骨料模型Y方向的膨胀位移10800 s

图16 不同含量骨料模型X方向的应力分布10800 s

图17 不同含量骨料模型Y方向的应力分布10800 s

图18 不同含量骨料模型的膨胀位移和应力曲线

图19 钠扩散实验装置图

图20 数值模拟结果与实验结果的比较

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