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Rectangular Section Control Technology for Silicon Steel Rolling 认领 引用 被引量：10
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作者 Xiao-chen WANG Quan YANG You-zhao SUN 《Journal of Iron and Steel Research International》 SCIE CAS CSCD 2015年第3期185-191,共7页
Rectangular section control technology （RSCT） was introduced to achieve high-precision profile control during silicon steel rolling. The RSCT principle and method were designed, and the whole RSCT control strategy w... Rectangular section control technology （RSCT） was introduced to achieve high-precision profile control during silicon steel rolling. The RSCT principle and method were designed, and the whole RSCT control strategy was developed. Specifically, RSCT included roll contour design, roiling technology optimization, and control strategy development, aiming at both hot strip mills （HSMs） and cold strip mills （CSMs）. Firstly, through the high-performance variable crown （HVC） work roll optimization design in the upper-stream stands and the limited shifting technology for schedule-free rolling in the downstream stands of HSMs, a hot strip with a stable crown and limited wedge, ：local spot, and single wave was obtained, which was suitable for cold rolling. Secondly, an approximately rectangular section was obtained by edge varying contact （EVC） work roll contour design, edge-drop setting control, and. closed loop control in the upper-stream, stands of CSMs. Moreover, complex-mode flatness control was realized by coordinating multiple shape-control methods in the downstream stands of CSMs. In addition, the RSCT approach was applied in several silicon-steel production plants, where an outsicanding performance and remarkable economic benefits were observed. 展开更多
关键词 silicon steel rectangular section control technology hot rolling cold rolling edge drop
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Sensitivity of springback and section deformation to process parameters in rotary draw bending of thin-walled rectangular H96 brass tube 认领 引用 被引量：14
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作者 ZHU Ying-xia LIU Yu-li YANG He 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第9期2233-2240,共8页
In order to study the effects of the process parameters on springback and section deformation,a sensitivity analysis model was established based on the combination use of the multi-parameter sensitivity analysis metho... In order to study the effects of the process parameters on springback and section deformation,a sensitivity analysis model was established based on the combination use of the multi-parameter sensitivity analysis method and the springback/section deformation prediction finite element model,and by using this model the sensitivities of the springback and the section deformation to process parameters were analyzed and compared.The results show that the most sensitive process conditions for springback angle are the boost speed and the pressure of pressure die,and the most sensitive process condition for section deformation is the number of cores.When the clamp force,the boost speed and the pressure of pressure die are utilized to control section deformation,the effect of these process parameters on springback should be considered.When the process parameters are mainly used to control springback,the effect of these process parameters on the section deformation should be always considered. 展开更多
关键词 thin-walled rectangular H96 brass tube rotary draw bending sensitivity analysis springback section deformation
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Research and application of approximate rectangular section control technology in hot strip mills 认领 引用 被引量：4
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作者 Hai-nan He Jian Shao +4 位作者 Xiao-chen Wang Quan Yang Yang Liu Dong Xu You-zhao Sun 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2021年第3期279-290,共12页
Profile requirements of silicon steel strip are extremely high and the thickness difference of cold-rolled products is usually less than 7μm,and the profile quality of hot-rolled strip is the key to ensure the thickn... Profile requirements of silicon steel strip are extremely high and the thickness difference of cold-rolled products is usually less than 7μm,and the profile quality of hot-rolled strip is the key to ensure the thickness difference of cold-rolled products.In order to produce the silicon steel strip with high-precision shape,the concept of quasi-rectangular rolling during hot continuous rolling was put forward;the equipment configuration and technical method of approximate rectangular section control were studied.Through the roughing multi-target load distribution technology and the roll configuration technology for uniform wear of a 4-high rolling mill,the strip crown of transfer bar was reduced and the profile control stability was guaranteed.Configuring variable contact back-up roll technology on all stands in the finishing rolling process,equipped with symmetry variable taper work roll and long-stroke intelligent shifting strategy in the downstream stands,and using side rolling lubrication technology can make the roll wear more uniform,reduce the edge drop of silicon steel strip,improve the profile quality,and make the strip section of finishing exit"quasi-rectangular".In addition,induction furnace and side heater were also equipped to guarantee the temperature uniformity of the strip,so as to improve the stability of profile control.The whole control technology is based on the 1580-mm hot continuous rolling production line,designed,and developed according to the characteristics of equipment and products,and has been successfully applied,which can obtain the approximate rectangular strip section satisfying the flatness quality,and improve the strip section precision of silicon steel and other products. 展开更多
关键词 Approximate rectangular section Hot strip mill Transfer bar Roll contour Shifting strategy Profile control
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ANALYTICAL SOLUTION OF RESTRAINED TORSIONAL STRESSES AND DISPLACEMENT FOR RECTANGULAR- SECTION BOX BAR WITH HONTYCOMB CORE 认领 引用
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作者 张英世 张行 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2004年第7期779-785,共7页
Differential equation of restrained torsion for rectangular-section box bar with honeycomb core was established and solved by using the method of undetermined function.Non-dimension normal stress, shear stress acting ... Differential equation of restrained torsion for rectangular-section box bar with honeycomb core was established and solved by using the method of undetermined function.Non-dimension normal stress, shear stress acting in the faceplate and shear stress acting in the honeycomb-core and warping displacement were deduced. Numerical analysis shows the normal stress attenuates quickly along x-axis. Normal stress acting on the cross section at a distance of 20 h from the fixed end is only one per cent of that acting on the fixed end. 展开更多
关键词 honeycomb structure constrain twist attenuation rectangular section box bar normal stress shear stress warping displacement
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Spontaneous emission of a moving atom in a waveguide of rectangular cross section 认领 引用
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作者 曾静 卢竞 周兰 《Chinese Physics B》 SCIE EI CAS CSCD 2023年第2期92-96,共5页
We study the spontaneous emission(SE) of an excited nonrelativistic two-level system(TLS) interacting with the vacuum in a waveguide of rectangular cross section. All TLS’s transitions and the center-of-mass motion o... We study the spontaneous emission(SE) of an excited nonrelativistic two-level system(TLS) interacting with the vacuum in a waveguide of rectangular cross section. All TLS’s transitions and the center-of-mass motion of the TLS are taken into account. The SE rate and the carried frequency of the emitted photon for the TLS initially being at rest are obtained, it is found that in the first order of the mass M, the frequency of the emitted photon is smaller than the transition frequency of the TLS and the SE rate is smaller than the SE rate Γfof the TLS fixed in the same waveguide. The SE rate for the TLS initially being moving is obtained in the second order of the mass M. The SE rate is smaller than Γfbut it is dependent not only on the atomic mass but also on the initial momentum. The carried frequency of the emitted photon is decreased when it travels along the direction of the initial momentum, whereas it is increased when it travels in the opposite direction of the initial momentum. 展开更多
关键词 spontaneous emission moving atom waveguide of rectangular cross section
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The Possibilities of Determining the Effective Thermal Conductivity of Steel Rectangular Section Bundles Based on the Selected Literature Models 认领 引用
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作者 Rafal Wyczolkowski Agnieszka Benduch 《Journal of Physical Science and Application》 2016年第4期48-58,共11页
The article presents the results of calculations of the effective thermal conductivity kef for bundles of steel rectangular sections obtained for a few analytical models. This coefficient expresses the ability of the ... The article presents the results of calculations of the effective thermal conductivity kef for bundles of steel rectangular sections obtained for a few analytical models. This coefficient expresses the ability of the bundles to heat transfer. The knowledge about the values of the kef coefficient of the section bundles is essential to correctly identify the parameters of their heat treatment process. The quality of the Calculation results were verified by the experimental measurement data. These measurements were performed in the guarded hot plate apparatus. It should be noted, that none of the eleven analyzed models of effective thermal conductivity is suitable for evaluation of thermal properties of the section bundles. 展开更多
关键词 Effective thermal conductivity steel rectangular sections heat treatment porous charge.
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Physical Principles of Optimization of the Static Regime of a Cantilever-Type Power-effect Sensor with a Constant Rectangular Cross Section 认领 引用
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作者 Petro Kosobutskyy Mariia Kuzmynykh Yaroslav Matviychuk 《Journal of Electronic Research and Application》 2018年第5期11-15,共5页
In this paper an analysis of the physical principles of two-criterion optimization Pareto static mode of operation of power sensors cantilever type of rectangular type with a stable cross-section.The proposed criterio... In this paper an analysis of the physical principles of two-criterion optimization Pareto static mode of operation of power sensors cantilever type of rectangular type with a stable cross-section.The proposed criterion based on the Cauchy number is one of the characteristic numbers of the proportional miniaturization of microsystem technology.It is established that,for a rectangular cantilever with a stable cross-section,the value of the Cauchy does not depend on the width of the microconsole and the material from which it is made. 展开更多
关键词 physical principles Cauchy number rectangular cross section
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Brief Introduction of Shallow Soil Jacking Construction Method of Large Section Rectangular Pipe Jacking Machine 认领 引用
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作者 CHAIJianping 《外文科技期刊数据库（文摘版）工程技术》 2022年第3期065-069,共5页
The first permanent magnet driven rectangular pipe jacking machine independently developed in China is used for the construction of pedestrian passage in Banxuegang Science and Technology City area of Shenzhen. The re... The first permanent magnet driven rectangular pipe jacking machine independently developed in China is used for the construction of pedestrian passage in Banxuegang Science and Technology City area of Shenzhen. The rectangular pipe jacking machine occupies a small area during the initial excavation. It is suitable for shallow soil covering and short-distance excavation. It is more economical and applicable than shield machine and has high construction efficiency. During the construction process, technical measures such as attitude measurement and adjustment of pipe jacking machine, surrounding rock grouting and friction reduction can effectively ensure the smooth construction of pipe jacking machine, and provide reference for large section pipe jacking machine in shallow soil construction. 展开更多
关键词 large section rectangular pipe jacking machine shallow overburden construction method
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一种大断面矩形顶管预制车站结构抗震性能研究 认领 引用 被引量：1
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作者 吴永照 蒋首超 +5 位作者 朱其凯 阳文胜 刘树亚 姚浩宇 柳献 周胜阳 《工业建筑》 CAS 2026年第4期256-265,共10页
为研究大断面矩形顶管车站结构的抗震性能,设计开展了整体结构1∶5缩尺模型拟静力试验和纵缝接头足尺模型拟静力试验。试验结果表明:在整体结构缩尺模型拟静力试验中,结构出现裂缝时的水平力约为设计地震作用的7.5倍,当结构的顶部水平... 为研究大断面矩形顶管车站结构的抗震性能,设计开展了整体结构1∶5缩尺模型拟静力试验和纵缝接头足尺模型拟静力试验。试验结果表明:在整体结构缩尺模型拟静力试验中,结构出现裂缝时的水平力约为设计地震作用的7.5倍,当结构的顶部水平力达到设计地震作用的9倍时,结构骨架曲线基本仍处于弹性阶段;接头的滞回曲线形状均呈现梭形,滞回曲线峰值荷载后能保持一定的下降段,具备较好的变形能力,接头在达到峰值荷载后还有较强的耗能能力,抗震性能表现良好;该顶管车站预制结构和接头形式合理,抗震性能满足设计要求。 展开更多
关键词 大断面 矩形衬砌结构 整体结构 纵缝接头 抗震性能
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低压磨料空气射流喷嘴磨损特性及影响因素 认领 引用
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作者 张宏图 马欣悦 +3 位作者 魏建平 刘勇 叶红燕 李博涛 《煤炭学报》 EI CAS CSCD 北大核心 2026年第2期1325-1341,共17页
低压磨料空气射流作为新型辅助破岩技术,在2 MPa压力下通过矩形截面喷嘴实现磨料的超声速喷射,提升破岩效率。但磨料与喷嘴内壁的碰撞磨损会影响射流稳定性及效率,为明确低压磨料空气射流中结构参数对喷嘴磨损特性的影响,采用CFD-DEM耦... 低压磨料空气射流作为新型辅助破岩技术,在2 MPa压力下通过矩形截面喷嘴实现磨料的超声速喷射,提升破岩效率。但磨料与喷嘴内壁的碰撞磨损会影响射流稳定性及效率,为明确低压磨料空气射流中结构参数对喷嘴磨损特性的影响,采用CFD-DEM耦合方法,结合Archard Wear模型,对不同结构参数的拉瓦尔(Laval)矩形截面喷嘴内流体进行数值模拟,研究收敛段长度、喉部尺寸和扩张段长度对喷嘴磨损的影响。基于Box-Behnken试验设计方法构建二阶响应面模型,量化各结构参数对喷嘴磨损的显著性影响,并提出优化喷嘴结构设计。结果表明:矩形喷嘴的磨损主要集中于收敛段后端和扩张段前端,其中扩张段磨损区域呈U型分布;收敛段长度与最大磨损深度呈负相关,收敛段从10 mm增至30 mm时,磨损深度由1.25×10-5mm降至2.82×10-6mm,降幅达77.4%;喷嘴的最大磨损深度与喉部尺寸呈负相关,而随着喉部尺寸的增加,粒子最大射出速度先增大后减小;随着扩张段延长,喷嘴最大磨损深度先增大后缓慢减小,粒子最大射出速度逐渐增加;通过响应面分析可知,喷嘴的最大磨损深度对收敛段长度敏感度最高,扩张段长度对粒子最大射出速度影响最显著;优化后的喷嘴参数为收敛段30 mm、喉部3.12 mm×10.38 mm、扩张段157 mm,较标准喷嘴磨损深度降低68.87%,磨料粒子射出最大速度提升5.83%,实现了低磨损与高效率的平衡。 展开更多
关键词 磨料空气射流 矩形截面喷嘴 喷嘴结构 喷嘴磨损 响应面分析
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全断面矩形掘进机刀盘设计及其稳定截割岩样截割特性试验研究 认领 引用
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作者 李强 刘送永 王焱 《中国机械工程》 EI CAS CSCD 北大核心 2026年第2期487-497,共11页
针对现有煤矿巷道全断面矩形掘进机刀盘形式复杂、全断面一次掘进成形困难等问题,提出了一种基于勒洛三角形运动原理实现矩形截割的方法,设计了一种基于所提方法的偏心轴行星齿轮驱动勒洛三角形单刀盘,进行了运动轨迹仿真,搭建了全断面... 针对现有煤矿巷道全断面矩形掘进机刀盘形式复杂、全断面一次掘进成形困难等问题,提出了一种基于勒洛三角形运动原理实现矩形截割的方法,设计了一种基于所提方法的偏心轴行星齿轮驱动勒洛三角形单刀盘,进行了运动轨迹仿真,搭建了全断面矩形刀盘截割试验台,进行了稳定截割状态下的多组试验。试验结果表明:中心鱼尾刀能增加截割过程的稳定性,较大程度地减小了X、Y、Z方向的振动,减小幅度最小达42.107%,最大达51.753%;进行了11组不同截割参数下的稳定截割岩样试验,得到了扭矩、油压与截割参数的变化关系,提出了设备经济截割参数区域的概念,确定了在试验岩样下所设计的刀盘经济截割参数区域为:转速n(N-p)min=[6.6,9.8]r/min,掘进速度v(N-p)min=[14.25,18.3]mm/min;对截割后的岩样断面轮廓进行三维扫描、重构和比对,得到理论断面、仿真断面、试验断面与标准正方形之间的图形差异率依次为3.18%、5.09%、6.64%,验证了该刀盘实现矩形截割的可行性。 展开更多
关键词 全断面 矩形 掘进机 截割特性 图形差异率 经济截割区域
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Influence of Axial Feeding on Hydroforming of Aluminum Alloy Tubular Part with Rectangular Section 认领 引用 被引量：3
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作者 宋鹏 王小松 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2009年第S1期190-194,共5页
The hydroforming experiment of aluminum tubular part with rectangular section was carried out to investigate influence of axial feeding on thickness distribution and calibration pressure of the corner.Thickness distri... The hydroforming experiment of aluminum tubular part with rectangular section was carried out to investigate influence of axial feeding on thickness distribution and calibration pressure of the corner.Thickness distribution and relation between corner radius and internal pressure were analyzed.The influence of lubricant was discussed.Microstructure and hardness of different region were observed.It is shown that thickness reduction in the transition region between the corner and center region is the biggest.Friction condition has influence both on the thickness distribution and calibration pressure of the corner.As the increase of the axial feeding,the calibration pressure is decreased.There is only little change for the microstructure,but the hardness is increased by 23.3% for the transition region. 展开更多
关键词 hydroforming internal high pressure forming aluminum alloy rectangular section corner filling
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基于动力学模态分解的小厚宽比矩形截面的风压场研究 认领 引用
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作者 陈伏彬 祝瑜哲 左小伟 《湖南大学学报（自然科学版）》 EI CAS CSCD 北大核心 2026年第1期160-172,共13页
为探究小厚宽比(D/B<1.0)矩形截面的风荷载特性,选择了截面面积固定、厚宽比在0.25~1.00范围内变化的三维模型.利用基于空间平均的大涡模拟方法,首先得到4种厚宽比模型的气动力系数,以及模型不同立面的水平脉动风压相关系数,随后对... 为探究小厚宽比(D/B<1.0)矩形截面的风荷载特性,选择了截面面积固定、厚宽比在0.25~1.00范围内变化的三维模型.利用基于空间平均的大涡模拟方法,首先得到4种厚宽比模型的气动力系数,以及模型不同立面的水平脉动风压相关系数,随后对比分析了厚宽比对模型侧面测点风压的乘积时程峰值及相位的影响.最后基于动力学模态分解(dynamic mode decomposition,DMD)方法建立了能够提取主要模态并重构风压场的降阶模型,对不同厚宽比模型的风压场进行分析.结果表明:厚宽比的降低会影响模型侧面的分离再附,改变风荷载作用机制,显著降低脉动风压的水平相关性,其中0.25厚宽比模型效果最为显著,在侧面再附长度约0.6B位置处为风压脉动特性的转捩点,转捩点上、下游风压时程呈现反相位且负相关特征.DMD方法提取的前4阶模态能够准确重构流场,阐明小厚宽比模型的随机风压场.本研究为相关流动控制和结构设计提供参考. 展开更多
关键词 动力学模态分解 厚宽比 矩形截面 脉动风压相关性 大涡模拟 气动性能
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大断面矩形顶管穿越废弃柔性污水管道施工技术研究 认领 引用
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作者 魏坤华 《工程建设与设计》 2026年第6期146-148,共3页
针对全断面砂层地质条件下大断面矩形顶管直接磨穿柔性废弃污水管道的施工难题,结合广州地铁14号线二期创意园地铁车站出入口工程实例,研究采用矩形土压平衡顶管机,配套废弃管道精准探测、封堵泄压、分段切割与混合浆液填充等处理措施,... 针对全断面砂层地质条件下大断面矩形顶管直接磨穿柔性废弃污水管道的施工难题,结合广州地铁14号线二期创意园地铁车站出入口工程实例,研究采用矩形土压平衡顶管机,配套废弃管道精准探测、封堵泄压、分段切割与混合浆液填充等处理措施,并严格控制顶进参数。实践证明,该施工方法可实现顶管安全穿越,未引发地面沉降或管线损坏,验证了该技术方案的可行性与安全性。 展开更多
关键词 大断面矩形顶管 柔性污水管道 全断面砂层 施工技术 风险控制
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大断面矩形顶管下穿既有综合管廊施工影响研究 认领 引用
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作者 吴丽萍 雷朝英 姜世乾 《北方建筑》 2026年第3期109-113,共5页
大断面矩形顶管施工若控制不当,极易引发地层出现较大变形,进而影响既有结构的安全。针对大断面矩形顶管近距离施工时的变形控制难题,以长春市某顶管工程为依托,对大断面矩形顶管施工引起的地层及既有结构变形展开监测,采用Midas软件建... 大断面矩形顶管施工若控制不当,极易引发地层出现较大变形,进而影响既有结构的安全。针对大断面矩形顶管近距离施工时的变形控制难题,以长春市某顶管工程为依托,对大断面矩形顶管施工引起的地层及既有结构变形展开监测,采用Midas软件建立三维数值模型,分析注浆压力与管-土摩阻力对地表及管廊沉降的影响。研究表明:注浆压力对沉降控制起主导作用,其与地表及管廊沉降呈显著正相关;管-土摩阻力虽不会直接导致显著沉降,但与地表变形存在协同约束机制,合理利用该机制可抑制土体位移;管廊结构响应表现出明显的空间异质性,受非对称施工扰动影响,两侧灵敏度存在差异。该研究成果可为类似工程提供参数优化与风险控制的理论依据。 展开更多
关键词 大断面 矩形顶管 综合管廊 地表沉降 数值模拟
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多腔矩形钢管混凝土柱抗震性能研究 认领 引用
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作者 余文卓 刘劲 +2 位作者 潘志成 王文君 李刚 《铁道科学与工程学报》 EI CAS CSCD 北大核心 2026年第7期3431-3444,共14页
矩形钢管混凝土柱因力学性能良好和施工便捷的特点,在工程中应用广泛。为弥补单腔钢管对截面宽厚比较大的构件核心混凝土约束效应不足的缺陷,改善拉筋等贯通约束形式增大构件施工难度、箍筋等局部约束形式对大体积钢管混凝土构件约束作... 矩形钢管混凝土柱因力学性能良好和施工便捷的特点,在工程中应用广泛。为弥补单腔钢管对截面宽厚比较大的构件核心混凝土约束效应不足的缺陷,改善拉筋等贯通约束形式增大构件施工难度、箍筋等局部约束形式对大体积钢管混凝土构件约束作用有限的不足,提出了一种采用加劲肋钢板将混凝土分隔开的多腔矩形钢管混凝土柱构件,并对8个多腔矩形钢管混凝土试件进行了拟静力试验,考察腔体布置形式、轴压比等参数对承载力、刚度、延性和损伤位移比的影响,分析其破坏模式及荷载-位移关系。在试验基础上,采用ABAQUS有限元软件建立多腔矩形钢管混凝土柱的非线性拟静力模型,对试验的破坏模式、滞回曲线以及塑性耗能进行验证。研究结果表明:增加腔室数量能显著提升构件的承载力和刚度。具体而言,4腔试件较单腔试件的峰值承载力提升了27.85%,弹性阶段刚度提升了23.86%,而单腔与双腔试件的性能则较为接近,轴压比对承载力和刚度性能的影响较小。此外,增加腔室能改善构件延性,4腔试件较单腔试件的延性提升了19.42%。有限元模型较好复现钢管屈曲等试验破坏模式,滞回曲线误差可控,模拟与试验峰值荷载比值均值为0.966,离散系数为0.027,验证了模型可靠性。随着腔室数量和钢材强度增加,构件总塑性耗能显著提升,轴压比对抗震耗能有一定影响,混凝土强度对塑性耗能影响较小。研究成果为多腔矩形钢管混凝土的抗震优化设计提供科学依据,为工程实践及相关规范的制定奠定基础。 展开更多
关键词 多腔 矩形截面 拟静力性能 峰值承载力 有限元
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Three-dimensional detonation cellular structures in rectangular ducts using an improved CESE scheme 认领 引用 被引量：2
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作者 沈洋 申华 +2 位作者 刘凯欣 陈璞 张德良 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第11期369-377,共9页
The three-dimensional premixed H2-O2 detonation propagation in rectangular ducts is simulated using an in-house parallel detonation code based on the second-order space-time conservation element and solution element（... The three-dimensional premixed H2-O2 detonation propagation in rectangular ducts is simulated using an in-house parallel detonation code based on the second-order space-time conservation element and solution element（CE/SE） scheme.The simulation reproduces three typical cellular structures by setting appropriate cross-sectional size and initial perturbation in square tubes.As the cross-sectional size decreases,critical cellular structures transforming the rectangular or diagonal mode into the spinning mode are obtained and discussed in the perspective of phase variation as well as decreasing of triple point lines.Furthermore,multiple cellular structures are observed through examples with typical aspect ratios.Utilizing the visualization of detailed three-dimensional structures,their formation mechanism is further analyzed. 展开更多
关键词 detonation perturbation rectangular diagonal visualization sectional conservation triple walls initially
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Determination of continuous constitutive relationship of weld zone of high-strength steel rectangular welded tube 认领 引用 被引量：1
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作者 Hai-long Liu Yu-li Liu +2 位作者 Zhong Yang Kun Wang Meng-meng Liu 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2020年第10期1212-1225,共14页
For QSTE700 high-strength steel rectangular welded tube,the mechanical properties of the weld zone vary with the distancefrom the centerline of the weld.Therefore,the accurate description of constitutive relationship ... For QSTE700 high-strength steel rectangular welded tube,the mechanical properties of the weld zone vary with the distancefrom the centerline of the weld.Therefore,the accurate description of constitutive relationship of the weld zone is of greatsignificance for the study of formability of QSTE700 rectangular welded tube.Firstly,the mechanical properties of parentand mixed specimens containing weld zone and parent zone were obtained by uniaxial tensile test.And based on the micro-hardness test,the width and the microhardness distribution of the weld zone were determined.Secondly,by subdividingthe weld zone into several small areas,and combining with the rule of mixtures and nanoindentation test,the continuous functional relationships of strength coefficient K,hardening coeffecient n and elastic modulus E were obtained,and then,the continuous constitutive relationship of QSTE700 rectangular welded tube was established.Finally,the validity and reliability of the continuous constitutive relationship of welded tube were verified by nanoindentation fest and rotary drawbending of rectangular welded tubc.Besides,it was found that the finite element model of rotary draw bending of QSTE700 rectangular welded tube established by using the continuous constitutive relationship can well simulate the cross sectiondeformation and wall thickness variation. 展开更多
关键词 QSTE700 high-strength steel rectangular welded tube Continuous constitutive relationship-Nanoindentation test Rotary draw bending process Cross section deformation Wall thickness variation
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转子相变液冷系统中矩形管道换热特性研究 认领 引用
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作者 李瑞玮 赵晟 +1 位作者 阮琳 李志 《电工电能新技术》 CSCD 北大核心 2026年第5期53-62,共10页
为适应大容量水电机组向高转速发展的需求,立式电机转子高效冷却技术亟待研究。蒸发冷却技术凭借传热效率高、温度均匀性好的特点,将会成为转子冷却极具竞争优势的解决方案之一,但目前转子磁极线圈相变液冷系统设计缺乏有效指导。本文... 为适应大容量水电机组向高转速发展的需求,立式电机转子高效冷却技术亟待研究。蒸发冷却技术凭借传热效率高、温度均匀性好的特点,将会成为转子冷却极具竞争优势的解决方案之一,但目前转子磁极线圈相变液冷系统设计缺乏有效指导。本文聚焦平行于竖直转轴旋转的矩形截面冷却通道,开展了系统性理论分析及实验研究,探究了离心加速度(30 g~70 g)和热负荷(200~500 W)对转子相变液冷系统矩形管道换热特性的影响规律。理论推导平行转轴旋转的管内受热流体的动量方程和能量方程发现,旋转管道内流动及换热过程受有效格拉晓夫数Greff、罗斯比数Ro、雷诺数Re、普朗特数Pr等无量纲数共同作用。实验结果表明,管道的换热特性受离心加速度和热负荷的协同影响,属于典型的混合对流换热场景(0.1<Greff/Re2<10)。基于理论推导和实验结果,提出了适用于旋转矩形截面管道混合对流换热系数预测关联式,实现预测误差范围±6%以内。 展开更多
关键词 转子相变液冷 矩形截面通道 管道内冷 换热特性 离心加速度
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Limit Analysis for Reinforced Concrete Rectangular Members Under Bending, Shear and Torsion 认领 引用 被引量：1
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作者 陈溪 刘西拉 《Journal of Shanghai Jiaotong university(Science)》 EI 2014年第2期129-138,共10页
The ultimate strength of reinforced concrete(RC) rectangular members subjected to combined bending,shear and torsion is obtained from the limit analysis proposed in the present paper. Based on a warped failure surface... The ultimate strength of reinforced concrete(RC) rectangular members subjected to combined bending,shear and torsion is obtained from the limit analysis proposed in the present paper. Based on a warped failure surface determined by external loads, and a reasonable assumed stress distribution balancing external loads but not violating the yield condition, the bending-shear-torsion interaction can be derived from equilibrium conditions.According to the definition of lower-bound theorem in limit analysis, the calculated ultimate loads will be carried safely by the structure. The present method is a simple approach to obtain carrying capacities for RC elements under complex external loads. After comparing with the test results, a good agreement has been observed. The present method can be extended to explain the failure mechanism of RC members subjected to axial loads, and it is possible to develop a simple unified theory of RC members for engineering. 展开更多
关键词 reinforced concrete(RC) beam rectangular section limit analysis bending shear torsion
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