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Dynamic response mechanism of initial failure of coal mass induced by in-situ stress in an outburst inoculation process of the working face for coal mining [PDF]
, 2023 There is still a great challenge to reveal the micro-macro dynamic mechanical behavior of initial coal failure induced by mining stress field in working face as a necessary condition for the outburst occurrence.
Changhang XU +4 more
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Jianzhu Gangjiegou Jinzhan, 2021 残余应力是影响钢压杆整体稳定承载力的重要缺陷因素之一。为获得合理的国产Q460高强钢焊接T形截面残余应力分布模型,采用锯割法对不同截面尺寸的8个试件进行残余应力试验研究。根据实测数据,绘制各截面的残余应力分布图,研究板件宽厚比、板件厚度对残余应力大小及分布宽度的影响,组成截面各板件间的相关性及残余应力的自平衡性。分析结果表明:焊缝处残余拉应力大小与板件厚度及板件宽厚比无关,相应的分布宽度与板件厚度及板件宽厚比成反比;板件外伸段中部的残余压应力大小与板件厚度和板件宽厚比成反比 ...
熊晓莉, 王田, 谌磊
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Process design based on active residual stress control of H-beams during a straightening process [PDF]
, 2016 Aiming at the active residual stress control of H-beams during a roller straightening process,an analysis model of stress evolution during the straightening process is constructed based on the elastic-plastic theory.
GUAN Ben +4 more
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Distributed dislocation-residual stress model of cold rolled strips based on the complex variable function method of plane elasticity [PDF]
, 2016 In order to reveal the formation mechanism of the manifested waves of cold rolled strips,the distributed dislocation was calculated by using measured residual stress,and a distributed dislocation-residual stress model was proposed. The stress field of an
CHU Yu-gang +5 more
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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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Gaoya dianqi, 2023 环氧树脂浇注外锥套管在柜式气体绝缘开关设备中发挥载流导体和高压对地绝缘与支撑的关键作用，但工件内部残余应力与复杂的机械载荷叠加使外锥套管在运行工况下频繁发生开裂、击穿甚至解体等绝缘故障，严重威胁变配电系统安全稳定运行。文中以35 kV柜式开关设备外锥套管为研究对象，对比研究了超声法与钻孔法对其残余应力的检测效果，利用局部放电与抗弯试验验证了残余应力对工件运行可靠性的影响。主要结论如下：基于声弹性效应的残余应力检测方法发现环氧树脂外锥套管残余应力分布在-50～20 MPa ...
贺春 +8 more
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Analysis of fluid-structure interaction vibration based on the detection principle of SI-FLAT flatness measurement systems [PDF]
, 2017 In order to reveal the mechanical essence of the detecting principle of SI-FLAT flatness measurement systems, the mathematical model of the relationship between amplitude and residual stress was established, based on the theory of fluid-structure ...
CHU Yu-gang +6 more
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Effect of hot forming temperature on the microstructure and mechanical properties of high strength square tubes [PDF]
, 2016 To overcome the challenge of traditional roll forming process and equipment on high strength square tubes at room temperature,hot roll forming process using local induction heating was proposed to produce high strength square tubes.A series of tests ...
HAN Jing-tao +3 more
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Bending and springback analysis of bimetal composite plates during leveling [PDF]
, 2016 An analytical model of section elastoplastic state evolution paths was built for bimetal composite plates under different assemble patterns during bending and leveling based on engineering elastoplastic mechanics.
GUAN Ben, QIN Qin, ZANG Yong, ZHANG Chao
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Jianzhu Gangjiegou Jinzhan, 2023 为研究残余应力对钢梁内嵌式的预应力简支组合梁在火灾效应下的受力性能的影响，通过ABAQUS软件建立钢梁内嵌式的预应力简支钢-混组合梁几何非线性和材料非线性的有限元模型，利用热力-耦合法计算组合梁在高温下的结构响应行为。通过对梁的截面温度、整体挠度和跨中挠度、跨中截面应力分布、拉索应力和塑性变形、梁的整体曲率和跨中曲率等特性在高温下的结构响应进行考察，探究工程应用中常见初始残余应力对组合梁的影响机理。结果表明：残余应力主要是通过影响钢梁的截面模量，进而对钢梁的截面抗弯刚度产生影响 ...
刘雨晨, 郑志远
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