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装配式预应力混凝土框架梁柱压接接缝直剪试验 被引量:2
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作者 李东彬 柴彦凯 +1 位作者 李伟龙 高静贤 《东南大学学报(自然科学版)》 EI CAS CSCD 北大核心 2022年第6期1032-1042,共11页
为了研究预压应力、预应力分布、预应力筋销栓作用以及灌缝材料对装配式预应力混凝土框架梁柱压接接缝直剪性能的影响,进行了17个接缝试件的直剪试验,并提出了压接接缝直剪承载力的计算方法.结果表明,预应力能有效提高接缝的直剪承载力... 为了研究预压应力、预应力分布、预应力筋销栓作用以及灌缝材料对装配式预应力混凝土框架梁柱压接接缝直剪性能的影响,进行了17个接缝试件的直剪试验,并提出了压接接缝直剪承载力的计算方法.结果表明,预应力能有效提高接缝的直剪承载力.接缝截面均匀受压时,接缝的极限剪应力与均匀预压应力之间呈1.235 6倍的线性正相关关系,接缝的残余剪应力与均匀预压应力之间呈0.706倍的线性正相关关系.接缝截面偏心受压时,其预应力分布对极限承载力存在明显影响,在相同的预加力作用下,预加力偏心距越大,极限承载力下降也越明显.接缝的极限承载力由黏结力和预加力产生的静摩擦力组成;接缝的残余承载力由压力产生的摩擦力和预应力筋的销栓作用组成. 展开更多
关键词 接接 直剪试验 承载力 预压应力
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板栗嫁接接位粗度与接穗数量的研究
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作者 晋明奇 王新洋 《现代农业科技》 2005年第4期13-14,共2页
关键词 穗数 粗度 板栗 接接 嫁接部位 生产实践 嫁接试验 影响关系 嫁接苗 实生苗 关键性 愈合率 造林 侧枝 冠幅
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接接“地气”
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作者 劳骥 《前线》 北大核心 2010年第2期56-56,共1页
高楼上待久了.要下到地面走走,接接“地气”;坐火车时间长了,逢大站应到月台上遛遛,接接“地气”;乘轮船远航,得到中途码头转转。接接“地气”。据专家说,如此是为了把人体积存的静电释放、传导到大地,“地气”则从足心涌泉穴... 高楼上待久了.要下到地面走走,接接“地气”;坐火车时间长了,逢大站应到月台上遛遛,接接“地气”;乘轮船远航,得到中途码头转转。接接“地气”。据专家说,如此是为了把人体积存的静电释放、传导到大地,“地气”则从足心涌泉穴上升人体,可祛火解毒,驱除失眠烦恼等症状。 展开更多
关键词 接接"地气"》 劳骥 当代作品 文学创作
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装配式预应力混凝土框架梁柱压接接缝抗剪性能试验与承载力计算方法研究
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作者 柴彦凯 李东彬 +2 位作者 李伟龙 高静贤 李泉泳 《工程力学》 EI 2024年第12期189-200,共12页
梁柱压接接缝抗剪性能对保证装配式预应力混凝土框架整体性能至关重要,为研究预压应力作用和梁端弯矩作用对其抗剪性能和承载力的影响,进行了11个预应力压接接缝试件和3个预应力压接接缝受弯矩作用试件的抗剪性能试验。试验结果表明:预... 梁柱压接接缝抗剪性能对保证装配式预应力混凝土框架整体性能至关重要,为研究预压应力作用和梁端弯矩作用对其抗剪性能和承载力的影响,进行了11个预应力压接接缝试件和3个预应力压接接缝受弯矩作用试件的抗剪性能试验。试验结果表明:预加力能显著地增加接缝的抗剪承载能力,截面预应力分布对承载力有明显影响;预压应力均匀分布时,其极限剪应力和残余剪应力与均匀压应力之间均呈线性正相关关系;预压应力偏心分布时,预加力偏心距越大,其极限承载力较相同均匀预加力接缝降低越显著;接缝受梁端弯矩作用时,弯矩使接缝截面压力增加,接缝截面开裂前,压力合力偏心距减小,进而提高接缝的抗剪承载力;但接缝截面开裂后,压力合力偏心距增加,其抗剪承载力出现降低,接缝截面处于受弯极限状态时,抗剪承载力降至最低。提出了梁柱压接接缝考虑预应力作用和梁端弯矩作用的抗剪承载力计算方法。 展开更多
关键词 接接 抗剪试验 承载力 预压应力 梁端弯矩作用
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恒流量泵凸轮曲线优化设计 被引量:2
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作者 宋林松 陈国明 +2 位作者 李宗清 王复东 李建成 《机械传动》 CSCD 2001年第4期11-13,共3页
利用拼接组合法对胜利油田三次采油注聚用的恒流量泵凸轮进行了优化设计。分析了多项式运动规律、摆线运动规律等 4种曲线 ,根据恒流量泵的实际要求 ,将修正摆线位移方程改为凸轮曲线速度方程 ,并根据接触应力最小原则又进行了改进。优... 利用拼接组合法对胜利油田三次采油注聚用的恒流量泵凸轮进行了优化设计。分析了多项式运动规律、摆线运动规律等 4种曲线 ,根据恒流量泵的实际要求 ,将修正摆线位移方程改为凸轮曲线速度方程 ,并根据接触应力最小原则又进行了改进。优化后曲线无加速度、跃度突变 ,有利于提高凸轮使用可靠性。 展开更多
关键词 恒流量泵 凸轮曲面 接接组合法 优化设计 三次采油
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汉滩病毒S基因0.7kb片段与M基因G2片段不同拼接方式嵌合基因原核表达产物的初步比较 被引量:1
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作者 张芳琳 徐志凯 +6 位作者 罗雯 阎岩 吴兴安 刘勇 白文涛 胡刚 王海涛 《科学技术与工程》 2002年第5期21-25,共5页
比较汉滩病毒S、M基因部分片段的嵌合基因不同拼接方式表达产物的活性。构建了嵌合基因原核表达载体pGEX-4T-1-S0.7G2,并与已构建的pGEX-4T-1-G2S0.7的诱导表达产物进行了比较。结果表明,融合蛋白同时保持亲本蛋白的结合活性,且前者表... 比较汉滩病毒S、M基因部分片段的嵌合基因不同拼接方式表达产物的活性。构建了嵌合基因原核表达载体pGEX-4T-1-S0.7G2,并与已构建的pGEX-4T-1-G2S0.7的诱导表达产物进行了比较。结果表明,融合蛋白同时保持亲本蛋白的结合活性,且前者表达产物的结合活性始终比后者低。研究表明,嵌合基因的不同拼接方式对融合蛋白的活性可能有一定的影响。 展开更多
关键词 汉滩病毒 S基因 0.7kb片段 M基因 G2片段 接接方式 基因表达 肾综合征出血热 嵌合基因 原核表达产物
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去重网络对图像质量的影响
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作者 叶海智 刘镇 《河南师范大学学报(自然科学版)》 CAS CSCD 1996年第4期40-43,共4页
本文对目前市场上卫星电视接收机中视频去加重处理不兼容对图像质量的影响进行了深入的理论分析,并提出改进措施.对于卫星电视系统设计的通用性、提高收看效果等方面都具有指导意义.
关键词 信噪比 卫星电视接接 去重网络 图像质量
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Comparison of FSW and TIG welded joints in Al-Mg-Mn-Sc-Zr alloy plates 被引量:10
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作者 何振波 彭勇宜 +1 位作者 尹志民 雷学锋 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2011年第8期1685-1691,共7页
In order to study the welding process,microstructure and properties of Al-Mg-Mn-Sc-Zr alloy,comparative methods of friction stir welding(FSW) and tungsten inert gas(TIG) were applied to the two conditions of this ... In order to study the welding process,microstructure and properties of Al-Mg-Mn-Sc-Zr alloy,comparative methods of friction stir welding(FSW) and tungsten inert gas(TIG) were applied to the two conditions of this alloy,namely hot rolled plate and cold rolled-annealed plate.The relationships between microstructures and properties of the welded joints were investigated by means of optical microscopy and transmission electron microscopy.Compared with the base metal,the strength of FSW and TIG welded joints decreased,and the FSW welding coefficients were higher than the TIG welding coefficients.The loss of substructure strengthening and a very little loss of precipitation strengthening of Al3(Sc,Zr) cause the decreased strength of FSW welded joint.But for the TIG welded joint,the disappearance of both the strain hardening and most precipitation strengthening effect of Al3(Sc,Zr) particles contributed to its softening.At the same time,the grains in weld nugget zone of FSW welded joints were finer than those in the molten zone of TIG welded joints. 展开更多
关键词 Al-Mg-Mn-Sc-Zr friction stir welding tungsten inert gas welded joints
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Interface characteristic of friction stir welding lap joints of Ti/Al dissimilar alloys 被引量:12
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作者 陈玉华 倪泉 柯黎明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第2期299-304,共6页
Lap joints of TC1 Ti alloy and LF6 A1 alloy dissimilar materials were fabricated by friction stir welding and corresponding interface characteristics were investigated. Using the selected welding parameters, excellent... Lap joints of TC1 Ti alloy and LF6 A1 alloy dissimilar materials were fabricated by friction stir welding and corresponding interface characteristics were investigated. Using the selected welding parameters, excellent surface appearance forms, but the interface macrograph for each lap joint cross-section is different. With the increase of welding speed or the decrease of tool rotation rate, the amount of Ti alloy particles stirred into the stir zone by the force of tool pin decreases continuously. Moreover, the failure loads of the lap joints also decrease with increasing welding speed and the largest value is achieved at welding speed of 60 mm/min and tool rotation rate of 1500 r/min, where the interracial zone can be divided into 3 kinds of layers. The microhardness of the lap joint shows an uneven distribution and the maximum hardness of HV 502 is found in the middle of the stir zone. 展开更多
关键词 interface characteristic Ti/A1 dissimilar alloys friction stir welding lap joint
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Fatigue behavior and life prediction of A7N01 aluminium alloy welded joint 被引量:7
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作者 刘雪松 张亮 +2 位作者 王林森 吴双辉 方洪渊 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2012年第12期2930-2936,共7页
Fatigue characteristics of A7N01 aluminium alloy welded joint were investigated and a fatigue crack initiation life-based model was proposed. The difference of fatigue crack initiation life among base metal, weld meta... Fatigue characteristics of A7N01 aluminium alloy welded joint were investigated and a fatigue crack initiation life-based model was proposed. The difference of fatigue crack initiation life among base metal, weld metal and heat affected zone (HAZ) is slight. Furthermore, the ratio of fatigue crack initiation life (Ni) to fatigue life to failure(Nf) is a material dependent parameter, 26.32%, 40.21% and 60.67% for base metal, HAZ and weld metal, respectively. Total fatigue life predicted using the presented model is in good agreement with the experimental data and that using Basquin’s model. The observation results of fatigue fracture surfaces, using scanning electron microscope (SEM), demonstrate that fatigue crack initiates from smooth surface due to welding process for weld metal, blowhole in HAZ causes fatigue crack initiation, and the crushed second phase particles play an important part in fatigue crack initiation in base metal. 展开更多
关键词 aluminium alloy A7N01 aluminum alloy welded joint crack initiation FATIGUE fatigue life life prediction
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Fatigue behavior of AZ31B magnesium alloy electron beam welded joint based on infrared thermography 被引量:5
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作者 杨宏伟 崔泽琴 +2 位作者 王文先 许并社 许海鹰 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第10期2595-2602,共8页
Fatigue behavior of AZ31B magnesium alloy electron beam welded joint undergoing cyclic loading was investigated by infrared thermography. Temperature evolution throughout a fatigue process was presented and the mechan... Fatigue behavior of AZ31B magnesium alloy electron beam welded joint undergoing cyclic loading was investigated by infrared thermography. Temperature evolution throughout a fatigue process was presented and the mechanism of heat generationwas discussed. Fatigue limit of the welded joint was predicted and the fatigue damage was also assessed based ontheevolution of the temperatureand hotspot zone on the specimen surfaceduring fatigue tests. The presented results show that infrared thermography can not onlyquicklypredict the fatigue behavior of the welded joint, but also qualitatively identify the evolution of fatigue damage in real time. It is found that the predicted fatigue limit agrees well with the conventionalS-Nexperimental results. The evolution of the temperatureand hotspot zone on the specimen surface can be an effectivefatigue damage indicatorfor effectiveevaluationof magnesium alloy electron beam welded joint. 展开更多
关键词 magnesium alloy electron beam welded joint fatigue behavior infrared thermography
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Bonding interface characteristic and shear strength of diffusion bonded Ti-17 titanium alloy 被引量:11
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作者 李宏 张超 +1 位作者 刘宏彬 李淼泉 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第1期80-87,共8页
The bonding interface characteristic and shear strength of diffusion bonded Ti-17 titanium alloy at different bonding time were investigated. The results show that the average size of voids decreases while the amount ... The bonding interface characteristic and shear strength of diffusion bonded Ti-17 titanium alloy at different bonding time were investigated. The results show that the average size of voids decreases while the amount of voids decreases after increasing to the maximum value with the increasing bonding time. The irregular void with a scraggly edge tends to an ellipse void with smooth surface and then changes to a tiny void with round shape. The grains across bonding interface occur at bonding time of 60 min. The shear strength of bond increases with increasing bonding time, and the highest shear strength of bond is 887.4 MPa at 60 min. The contribution of plastic deformation on the void closure and the increase of shear strength is significant even though the action time of plastic deformation is short. 展开更多
关键词 Ti-17 titanium alloy diffusion bonding bonding interface VOID shear strength
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Effect of welding sequence on residual stress in thin-walled octagonal pipe-plate structure 被引量:11
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作者 傅定发 周长青 +2 位作者 李灿 王冠 李落星 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第3期657-664,共8页
A three-dimensional finite element approach based on ABAQUS code was developed to investigate the effect of welding sequence on welding residual stress distribution in a thin-walled 6061 aluminum alloy structure. To o... A three-dimensional finite element approach based on ABAQUS code was developed to investigate the effect of welding sequence on welding residual stress distribution in a thin-walled 6061 aluminum alloy structure. To obtain sound numerical results, the therrno-mechanical behaviour was simulated using a direct-coupled formulation. Nine different simulation sequences were carried out by single-pass TIG welding of an octagonal pipe-plate joint, and the distributions of longitudinal and transverse residual stresses both on the outer and inner surfaces of the pipe were analyzed. The results suggest that the final residual stresses in the weld and its vicinity are not affected by the initial residual stresses of the structure. Selecting a suitable welding sequence can reduce the final residual stress in an octagonal pipe-plate joint. 展开更多
关键词 residual stress welding sequence pipe-plate joint single-pass welding initial residual stress
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Effect of welding current on morphology and microstructure of Al alloy T-joint in double-pulsed MIG welding 被引量:12
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作者 易杰 曹淑芬 +2 位作者 李落星 郭鹏程 刘开勇 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2015年第10期3204-3211,共8页
The effect of current on the morphology of Al alloy T-joint in double-pulsed metal inert gas(DP-MIG) welding process was investigated by simulation and experiment.A three-dimensional finite element model and the DP-... The effect of current on the morphology of Al alloy T-joint in double-pulsed metal inert gas(DP-MIG) welding process was investigated by simulation and experiment.A three-dimensional finite element model and the DP-MIG heat source of double-ellipsoidal volumetric model were developed to simulate the temperature and stress fields under different welding conditions.The macro-morphology and microstructure of welding joints at the corresponding currents were observed in the experiment.The results show that the best condition is at an average current of 90 A and current difference of 40 A,when the maximum temperature is 200 °C higher than the fusion points,with the temperature difference of about 100 °C and stress change of 10 MPa between thermal pulse and thermal base.Under these conditions,Al alloy T-joint with proper fusion condition has smooth fish-scale welding appearance and finer microstructure.Furthermore,the thermal curves and stress distribution in the experiment are consistent with those in the simulation,verifying the precision of the welding simulation. 展开更多
关键词 double-pulsed MIG welding Al alloy T-joint welding current STRESS
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Electron beam welding of 304 stainless steel to QCr0.8 copper alloy with copper filler wire 被引量:5
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作者 张秉刚 赵健 +1 位作者 李晓鹏 冯吉才 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第12期4059-4066,共8页
Electron beam welding (EBW) of 304 stainless steel to QCr0.8 copper alloy with copper filler wire was carried out. Orthogonal experiment was performed to investigate the effects of process parameters on the tensile ... Electron beam welding (EBW) of 304 stainless steel to QCr0.8 copper alloy with copper filler wire was carried out. Orthogonal experiment was performed to investigate the effects of process parameters on the tensile strength of the joints, and the process parameters were optimized. The optimum process parameters are as follows:beam current of 30 mA, welding speed of 100 mm/min, wire feed rate of 1 m/min and beam offset of-0.3 mm. The microstructures of the optimum joint were studied. The results indicate that the weld is mainly composed of dendriticαphase with little globularεphase, and copper inhomogeneity only occurs at the top of the fusion zone. In addition, a melted region without mixing exists near the weld junction of copper side. This region with a coarser grain size is the weakest section of the joints. It is found that the microhardness of the weld decreases with the increase of the copper content in solid solution. The highest tensile strength of the joint is 276 MPa. 展开更多
关键词 304 stainless steel QCr0.8 copper alloy electron beam welding dissimilar joint mechanical properties
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Effects of welding current on properties of A-TIG welded AZ31 magnesium alloy joints with TiO_2 coating 被引量:1
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作者 沈骏 翟大军 +1 位作者 刘凯 曹中明 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第8期2507-2515,共9页
The effects of welding current on the macro-morphology, microstructure and mechanical properties of tungsten inert gas(TIG) welded AZ31 magnesium alloy joints with TiO2 coating were investigated. The results showed th... The effects of welding current on the macro-morphology, microstructure and mechanical properties of tungsten inert gas(TIG) welded AZ31 magnesium alloy joints with TiO2 coating were investigated. The results showed that the increase of welding current led to the increase in the depth/width ratio and deteriorated the surface appearance of the welded seams with TiO2 coating. The grain size of α-Mg and the amount of granular β-Mg17Al12 particles in the welded seams also increased. The welded joints with TiO2 coating exhibited a deeper weld penetration and larger grain size compared with the welded joint without TiO2 coating. When the welding current was less than 130 A, the ultimate tensile strength of the welded joints with TiO2 coating increased with the increase in welding current and then decreased when the welding current was greater than 130 A. The average microhardness of the heat-affected zone and fusion zone decreased gradually with the increase of welding current. 展开更多
关键词 AZ31 magnesium alloy A-TIG welding welding current TiO_2 coating
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Formation, microstructure and mechanical properties of double-sided laser beam welded Ti-6Al-4V T-joint 被引量:4
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作者 马旭颐 巩水利 +2 位作者 张久兴 芦伟 杨璟 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2016年第3期729-735,共7页
The T-joints of Ti?6Al?4V alloy were manufactured by double-sided synchronized laser beam welding with the homologous filler wire. The formation, microstructure and mechanical properties of welded joints as well as th... The T-joints of Ti?6Al?4V alloy were manufactured by double-sided synchronized laser beam welding with the homologous filler wire. The formation, microstructure and mechanical properties of welded joints as well as the correlations of each other were investigated. The results indicate that the quality of weld seams is good without defects such as discontinuity, beading, visible cracks or porosity, which is linked to the steady molten pool behavior and droplet transition. The morphologies of the heat affected zone (HAZ) located on the skin and stringer are disparate. The microstructure of the HAZ and fusion zone (FZ) is mainly comprised of acicular martensiticα′ phases. The microhardness of the HAZ and FZ is higher than that of the base metal (BM) and reaches a maximum value at the HAZ near FZ on the stringer. The tensile specimens along the skin and stringer fractured at the BM with ductile fracture surfaces. 展开更多
关键词 Ti-6Al-4V alloy double-sided laser beam welding T-JOINT high-speed photography microstructure mechanical property
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Microstructures and properties of welded joint of aluminum alloy to galvanized steel by Nd:YAG laser + MIG arc hybrid brazing-fusion welding 被引量:5
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作者 秦国梁 苏玉虎 王术军 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2014年第4期989-995,共7页
According to the differences in melting point between aluminum alloy and steel, 6013-T4 aluminum alloy was joined to galvanized steel by large spot Nd:YAG laser + MIG arc hybrid brazing-fusion welding with ER4043(A... According to the differences in melting point between aluminum alloy and steel, 6013-T4 aluminum alloy was joined to galvanized steel by large spot Nd:YAG laser + MIG arc hybrid brazing-fusion welding with ER4043(AlSi5) filler wire. The microstructures and mechanical properties of the brazed-fusion welded joint were investigated. The joint is divided into two parts of fusion weld and brazed seam. There is a zinc-rich zone at fusion weld toe, which consists of α(Al)-Zn solid solution and Al-Zn eutectic. The brazed seam is the Fe-Al intermetallic compounds (IMCs) layer of 2-4μm in thickness, and the IMCs include FeAl2, Fe2Al5 and Fe4Al13. FeAl2 and Fe2Al5 are located in the compact reaction layer near the steel side, and Fe4Al13 with tongue shape or sawtooth shape grows towards the fusion weld. The tensile strength of the joint firstly increases and then decreases as the welding current and laser power increase, the highest tensile strength can be up to 247.3 MPa, and the fracture usually occurs at fusion zone of the fusion weld. The hardness is the highest at the brazed seam because of hard Fe-Al IMCs, and gradually decreases along the fusion weld and galvanized steel, respectively. 展开更多
关键词 brazing-fusion weldingi welding of dissimilar metals hybrid welding mechanical properties intermetallic compounds
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A 1.8V CMOS Direct Conversion Receiver for a 900MHz RFID Reader Chip 被引量:1
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作者 谈熙 刘圆 +5 位作者 卢磊 袁路 杨振宇 周嘉业 韩科峰 闵昊 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2008年第9期1734-1739,共6页
A direct conversion receiver with optimized tolerance to local carrier interference is designed and implemented in a 0.18μm 1P6M mixed-signal CMOS process for a 900MHz RFID reader transceiver. A baseband amplifier wi... A direct conversion receiver with optimized tolerance to local carrier interference is designed and implemented in a 0.18μm 1P6M mixed-signal CMOS process for a 900MHz RFID reader transceiver. A baseband amplifier with series feedback topology is proposed to achieve passive mixer buffering,baseband DC cancellation,and signal amplification simultaneously. The receiver has a measured input ldB compression point of - 4dBm and a sensitivity of - 70dBm when 10dB SNR for digital demodulation is required. The receiver is integrated in a reader transceiver chip and consumes 90mA from a 1.8V supply. 展开更多
关键词 direct conversion receiver DC cancellation READER RFID
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Direct Tunneling Effect in Metal-Semiconductor Contacts Simulated with Monte Carlo Method 被引量:2
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作者 孙雷 杜刚 +1 位作者 刘晓彦 韩汝琦 《Journal of Semiconductors》 EI CAS CSCD 北大核心 2001年第11期1364-1368,共5页
Considering the tunneling effect and the Schottky effect,the metal semiconductor contact is simulated by using self consistent ensemble Monte Carlo method.Under different biases or at different barrier heights,the i... Considering the tunneling effect and the Schottky effect,the metal semiconductor contact is simulated by using self consistent ensemble Monte Carlo method.Under different biases or at different barrier heights,the investigation into the tunneling current indicates that the tunneling effect is of great importance under reverse biases.The Schottky barrier diode current due to Schottky effect is in agreement with the theoretical one.The barrier lowering is found a profound effect on the current transport at the metal semiconductor interface. 展开更多
关键词 Monte Carlo device simulation metal semiconductor contact direct tunneling Schottky effect
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