Analysis of mechanical properties, permeability and fracturing mechanism of coal samples at different fracturing time of liquid nitrogen [PDF]
, 2023 In order to study the influence of liquid nitrogen cracking time on mechanical properties and permeability of coal samples, the independently developed WYS-800 triaxial gas seepage test device and acoustic emission detection system were used to conduct ...
Hao WANG +5 more
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Prediction method of surface subsidence due to underground coal gasification under thermal coupling [PDF]
, 2023 Underground coal gasification (UCG) is an essential part of the low-carbon green coal mining technology system. The implementation of the “double carbon” goal of the coal industry has brought excellent development opportunities for UCG. However, UCG will
Chao TANG +6 more
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Study on energy dynamic change law in the process of water-contained coal caused by liquid nitrogen freezing [PDF]
, 2023 To study the energy dynamic change law of moisture-contained coal in the process of liquid nitrogen freezing, a self-developed acoustic emission (AE) experimental system for the whole process of liquid nitrogen frozen coal was utilized to analyze the ...
Botao LI +6 more
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Study on evolution law of mechanical properties of coal samples subjected to freezing and freeze-thaw cycles of liquid nitrogen [PDF]
, 2023 The permeability of coal reservoir is generally low in China, how to effectively improve the permeability of coal reservoir is a key and difficult point of coalbed methane exploitation, Liquid nitrogen fracturing technology as a kind waterless fracturing
Dongming ZHANG +6 more
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Advanced characterization of coal microstructure before and after liquid nitrogen cold soaking [PDF]
, 2023 With the development of coal seam fracturing technology, promote the gas extraction by liquid nitrogen cold soaking fracturing coal has attracted widespread attention. In order to study the effect of liquid nitrogen cold soaking on the microstructures of
Dengke WANG, Shumin LIU, Xuelong LI
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Stress distribution law and adherent dross stability of the copper cooling stave with variable slag coating thickness [PDF]
, 2017 A thermal-mechanical coupling model of a copper cooling stave with variable slag coating was founded based on thermal elastic mechanics, and the influence of the gas temperature, the cooling system, the materials of insert bricks, and the properties of ...
LI Feng-guang, ZHANG Jian-liang
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Jianzhu Gangjiegou Jinzhan, 2021 钢结构中存在着残余应力,严重影响构件或节点刚度及极限承载力。利用有限元实体模型,通过预定义场功能引入煨弯钢管工艺中产生的热弯残余应力分布。考虑拱脚支承形式、荷载形式、长细比3个因素,研究了热弯残余应力对圆钢管拱结构平面内极限承载力的影响。通过分析得出:不同支承形式和荷载形式下热弯残余应力对钢拱平面内极限承载力的影响在3%以内,当均布荷载作用时热弯残余应力会使钢拱提前进入弹塑性阶段;当正则化长细比在1.30～1.70之间时,热弯残余应力对钢拱平面内极限承载力的影响最为明显,可降低9%。
芦燕, 宋浩然, 韩庆华
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Thermal deformation analysis of copper-steel composite staves [PDF]
, 2016 The improvement in thermal deformation resistance of the copper stave in the bosh area and lower stack area of a blast furnace is the key factor for prolonging the blast furnace campaign life.
CHENG Shu-sen +4 more
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He jishu阻氚涂层系统服役过程中，由于受到高温环境的影响，内部会产生大量的热应力。热应力的积聚会造成阻氚涂层的开裂与脱落，严重制约着聚变堆的安全运行。因此，开展阻氚涂层热应力研究具有重要意义。本文设计了热膨胀系数、弹性模量和屈服强度梯度涂层，并采用有限元模拟的方法，分析了基底粗糙度和涂层厚度对Er2O3/RAFM（低活性铁素体马氏体钢，Reduced Activation Ferritic/Martensitic）钢阻氚涂层系统热应力的影响规律。同时探索了不同种类梯度涂层对系统热应力的影响。结果表明 ...
刘 泽 +10 more
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基于接触电阻模型的电缆接头复合材料界面温度及应力分布仿真研究
Gaoya dianqi, 2021 为研究接触电阻过大而导致的压接缺陷对电缆接头温度及应力分布的影响,文中基于等效电导率的接触电阻理论,采用有限元软件建立了220 kV高压电缆接头压接缺陷下的电磁—热—应力多物理场耦合仿真模型,研究了电缆接头压接缺陷工况下预制件内硅橡胶绝缘/高压半导电复合材料界面温度和热应力特性的变化规律,并对不同负荷电流I和接触系数k下的温度、应力数据进行多元函数拟合,得到相应的计算方法。结果表明:高压电缆接头存在压接缺陷(如接触系数k=6)工况下,其复合材料界面热应力畸变了4.32倍 ...
梁振, 彭杰, 胡军
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