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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Effect of post-peak cyclic load on mechanics and seepage characteristics of sandstone under different confining pressures [PDF]
, 2023 The mining disturbance causes the rock mass in a certain range of the coal seam floor to be in a post-peak state. Due to the excavation of adjacent roadways and the mining of coal seams, the post-peak rock mass undergoes a cyclic loading-unloading ...
Daqiang XU +7 more
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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
doaj
深冷处理对7050铝合金尺寸稳定性及断裂韧性的影响 [PDF]
, 2019 研究了不同深冷处理工艺对7050铝合金尺寸稳定性和断裂韧性的影响。采用圆环开口方法对尺寸稳定性进行评价,对比了不同深冷处理工艺对尺寸稳定性的改善效果,从材料析出的角度分析了提高尺寸稳定性的深冷处理机理,并对微观组织的变化进行了分析。通过研究探索出了7050铝合金的最佳深冷处理工艺为-150℃×24 h,2次,尺寸稳定性提高了77. 9%,同时断裂韧性提高13.
刘轩之 +5 more
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Effect of local induction heating on secondary roll-forming of high strength square tubes [PDF]
, 2016 The formability of corners was improved by heating the corner area of high strength square tubes with induction coils.Under the premise of not impacting the undeformed zone,we obtained the ideal sectional dimension,microstructure and properties of ...
CHEN Qiang +5 more
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Energy-accumulation blasting and water injecting under local water storage and pressure retention in heading face [PDF]
, 2023 Due to the poor effect of local energy-accumulation blasting and water injection in the Xuehu Coal Mine and the undetermined influence range of local energy-accumulation blasting and water injection pressure relief, the spacing of blasting holes cannot ...
Tao ZHANG, Yu WANG, Zhenfeng WANG
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Jianzhu Gangjiegou Jinzhan, 2023 国内在高强冷弯厚壁型钢的冷作硬化效应和残余应力分布领域的研究还十分有限，基础数据匮乏。针对这一问题，对高强冷弯厚壁C形钢展开研究，对其母板及冷弯型钢构件的材性进行拉伸试验研究，得到母板和型钢截面不同部位的屈服强度及断后伸长率等指标。研究结果表明：冷作硬化效应在弯角部位更明显；冷作硬化效应的强弱主要与母板屈服强度、母板强屈比、型钢弯角内半径及壁厚等因素有关。采用“切割法”对冷弯型钢的纵向残余应力进行研究，根据实测数据绘制残余应力沿型钢全截面的分布曲线，并研究影响残余应力分布的主要因素 ...
李功文, 邵剑锋
doaj
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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Indentation effect on the fatigue limit of axle steel [PDF]
, 2016 A hardness tester was used to make indentations on the hourglass fatigue specimens of axle steel,and notches were machined by electronic discharge machining(EDM).The fatigue limits of both indentation specimens and notched ones were examined and compared
DAI Guang-ze +4 more
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Research on Key Issues in Eddy Current Nondestructive Evaluation of Residual Stress in Aluminum Alloy [PDF]
, 2015 铝合金作为制造业发展的基础材料，在航空航天、高速铁路、建筑工程、船舶制造、汽车工业等支柱产业中有着重要地位。残余应力往往是造成铝合金结构破坏的重要因素。有效的评价应力状态，特别是导致损伤出现的临界应力状态是评价设备结构强度、可靠性的重要依据。传统的无损检测方法已广泛应用于工程实际中，但大部分局限于对已成型的缺陷进行检测。对于可能导致损伤出现的隐性、不规律变化的残余应力状态的评价则较为困难。 目前，应用较多的残余应力检测法主要有盲孔法、X射线法、超声波法以及磁测法。这些方法在使用上都存在很大的局限性 ...
汪涛
core