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Study of the fatigue fractography of dual phase low carbon steel used in automotive industry
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作者 Ahmed A.Zainulabdeen Bahaa Sami Mahdi +3 位作者 Jabbar H.Mohmmed Niveen Jamal Abdulkader Muslim Ali Mujtaba A.Flayyih 《Theoretical & Applied Mechanics Letters》 CAS 2024年第5期371-377,共7页
Fatigue properties play a crucial role as they are vital to ensuring the durability and integrity of components subjected to repeated loading conditions over long periods.The main objective of this work is to investig... Fatigue properties play a crucial role as they are vital to ensuring the durability and integrity of components subjected to repeated loading conditions over long periods.The main objective of this work is to investigate the fatigue behavior of dual phase low-carbon steels used in automotive applications using a rotating bending fatigue machine.Heat treatments were carried out to analyze the microstructure's effect on the fatigue properties,including quenching low-carbon steel samples at 800℃ and 900℃.Hardness and tensile tests were performed,and the microstructure was inspected to examine the constitute phases.With the assistance of a scanning electron microscope,fractographic analyses were carried out to reveal the fracture features of the samples at different lifetime ranges.The results show that various failure mechanisms occur depending on the stress levels.Additionally,the specimens quenched at 900℃ exhibited higher fatigue strength. 展开更多
关键词 fatigue Dual phase low carbon steel
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EFFECT OF MICROSTRUCTURE ON CORROSION FATIGUE BEHAVIOUR OF A LOW CARBON BAINITE STEEL 被引量:1
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作者 ZHANG Rong ZHOU Lubin, Northwestern Polytechnical University, Xi’an, ChinaZHENG Wenlong HUA Huizhong, Shanghai Research Institute of Materials, Shanghai, China ZHANG Rong, Lecturer, Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1992年第7期43-47,共5页
The behaviour towards corrosion fatigue of low carbon bainite steel with various microstructures after tempered at different temperatures has been examined. The susceptibility of the steel to corrosion fatigue may be ... The behaviour towards corrosion fatigue of low carbon bainite steel with various microstructures after tempered at different temperatures has been examined. The susceptibility of the steel to corrosion fatigue may be improved by tempering at 300℃. 展开更多
关键词 corrosion fatigue BAINITE retained austenite low carbon steel
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INVESTIGATION OF FRACTURE DESIGN FOR MEDIUM CARBON STEEL UNDER EXTRA-LOW CYCLIC FATIGUE IN AXIAL LOADING 被引量:3
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作者 Youtang Li Shuai Tan Hongyan Duan 《Acta Mechanica Solida Sinica》 SCIE EI 2008年第4期375-382,共8页
The extra-low cyclic fracture problem of medium carbon steel under axial fatigue loading was investigated. Several problems, such as the relations of the cycle times to the depth and tip radius of the notch, loading f... The extra-low cyclic fracture problem of medium carbon steel under axial fatigue loading was investigated. Several problems, such as the relations of the cycle times to the depth and tip radius of the notch, loading frequency, loading range and the parameters of fracture design for medium carbon steel on condition of extra-low axial fatigue loading were discussed based on the experiments. Experimental results indicated that the tension-pressure fatigue loading mode was suitable for extra-low cyclic fatigue fracture design of medium carbon steel and it resulted in low energy consumption, fracture surface with high quality, low cycle times, and high efficiency. The appropriate parameters were as follows: loading frequency 3-5 Hz, notch tip radius r = (0.2-0.3) mm, opening angle α = 60°, and notch depth t = (0.14-0.17)D. 展开更多
关键词 extra-low cyclic fatigue fracture design medium carbon steel crack technique
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Effect of Fast Cooling Rate on the Microstructure and Mechanical Properties of Low-Carbon High-Strength Steel Annealed in the Intercritical Region 被引量:3
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作者 李壮 田勇 +2 位作者 KANG Shaopu ZHENG Zhen LIU Ming 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2014年第3期572-577,共6页
The effect of fast cooling rate on the microstructure and mechanical properties of low-carbon high-strength steel annealed in the intercritical region was investigated using a Gleeble 1500 thermomechanical simulator a... The effect of fast cooling rate on the microstructure and mechanical properties of low-carbon high-strength steel annealed in the intercritical region was investigated using a Gleeble 1500 thermomechanical simulator and a continuous annealing thermomeehanical simulator. The results showed that the microstructure consisted of ferrite and bainite as the main phases with a small amount of retained austenite and martensite islands at cooling rate of 5 and 50 ℃/s, respectively. Fast cooling after continuous annealing affected all constituents of the microstructure. The mechanical properties were improved considerably. Ultimate tensile strength (U-TS) increased and total elongation (TEL) decreased with increasing cooling rate in all specimens. The specimen 1 at a cooling rate of 5 ℃/s exhibited the maximum TEL and UTSxTEL (20% and 27 200 MPa%, respectively) because of the competition between weakening by presence of the retained austenite plus the carbon indigence by carbide precipitation, and strengthening by martensitic islands and precipitation. The maximum UTS and YS (1 450 and 951 MPa, respectively) were obtained for specimen 2 at a cooling rate of 50 ℃/s. This is attributed to the effect of dispersion strengthening of finer martensite islands and the effect of precipitation strengthening of carbide precipitates. 展开更多
关键词 cooling rate low-carbon high-strength steel intercritical annealing MICROSTRUCTURE mechanical properties
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Low cycle fatigue behavior of high strength gun steels
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作者 Maoqiu Wang Han Dong +1 位作者 Qi Wang Changgang Fan Division of Structural Materials, Central Iron & Steel Research Institute, Beijing 100081, China 《Journal of University of Science and Technology Beijing》 CSCD 2004年第3期268-272,共5页
The low cycle fatigue (LCF) behavior of two high strength steels, withnominal chemical compositions (mass fraction, %) of 0.40C-1.5Cr-3Ni-0.4Mo-0.2V (PCrNi3MoV) and0.25C-3Cr-3Mo-0.8Ni-0.1Nb (25Cr3Mo3NiNb), was investi... The low cycle fatigue (LCF) behavior of two high strength steels, withnominal chemical compositions (mass fraction, %) of 0.40C-1.5Cr-3Ni-0.4Mo-0.2V (PCrNi3MoV) and0.25C-3Cr-3Mo-0.8Ni-0.1Nb (25Cr3Mo3NiNb), was investigated by using the smooth bar specimenssubjected to strained-controlled push-pull loading. It is found that both steels show cyclicsoftening, but 25Cr3Mo3NiNb steel has a lower tendency to cyclic softening. 25Cr3Mo3NiNb steel hashigher fatigue ductility, and its transition fatigue life is almost three times that of PCrNi3MoV.25Cr3Mo3NiNb steel also shows higher LCF life either at a given total strain amplitude above 0.5% orat any given plastic strain amplitude, despite its lower monotonic tensile strength than that ofPCrNi3MoV. It also means that 25Cr3Mo3NiNb steel can endure higher total strain amplitude andplastic strain amplitude at a given number of reversals to failure within 10~4. 25Cr3Mo3NiNb steelis expected to be a good gun steel with high LCF properties because only several thousand firingsare required for gun barrel in most cases. 展开更多
关键词 high strength steel low cycle fatigue mechanical property
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Effect of Microalloying Additions on the Microstructure and Mechanical Properties of Low Carbon Steel 被引量:3
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作者 EISSA Mamdouh ABD El-Aziz Ahmed +2 位作者 GHALI Saeed HALFA Hossam SABER Shady 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2011年第S1期246-251,共6页
Low carbon steels are characterized by good weldability,formability and fracture toughness properties.However,the low strength levels of these steel grades limit their wide applications.On the other hand,increasing th... Low carbon steels are characterized by good weldability,formability and fracture toughness properties.However,the low strength levels of these steel grades limit their wide applications.On the other hand,increasing the strength by increasing the carbon content and alloying elements deteriorates the other properties.In this study,the microalloying technique was used to examine the possibility of attaining low carbon steels with good combination of strength,ductility and impact properties.A low carbon steel microalloyed with single addition of vanadium and another one microalloyed with combined addition of vanadium and titanium were used in this investigation and their properties were compared with non-microalloyed low carbon steel having the same base composition.Furthermore,other two nonmicroalloyed and V-microalloyed steels with higher carbon,silicon and manganese contents were also investigated to reveal the effect of base composition.Tensile,hardness,room and zero temperature Charpy V-notch impact tests were conducted to evaluate the variations in the mechanical properties of low carbon hot forged steel containing vanadium and combinations of vanadium and titanium.In addition,the microstructures of the different investigated steels were observed using both optical microscope and scanning electron microscope.Furthermore,the hardness of the ferrite phase was also determined using micro-hardness technique.The results showed improvement of the mechanical properties of the investigated steels by both single V-and combined V + Ti-microadditions.Tensile,hardness and impact tests results indicated that good combinations of strength,ductility and impact properties can be achieved by V-microalloying addition.Steel with combination of V and Ti microaddition has much higher hardness,yield strength,ultimate tensile strength and impact energy at both room and zero temperatures compared with non-microalloyed and single Vmicroalloyed steels.Higher C,Si and Mn contents result in increasing the strength accompanied with decreasing the impact energy.Scanning electron microscopy and optical microscopy studies revealed grain refinement effect of both Vand V+Ti-microadditions.The micro-hardness measurements of the ferrite phase confirmed the precipitation strengthening effect of microalloying elements. 展开更多
关键词 low carbon steels single microalloying combined microalloying strength DUCTILITY impact energy grain refinement precipitation strengthening
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Effect of Notch Location on Fatigue Life Prediction of Strength Mismatched HSLA Steel Weldments 被引量:1
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作者 S.Ravi V.Balasubramanian S.Nemat Nasser 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2004年第2期129-135,共7页
Welding of high strength low alloy steels (HSLA) involves usage of low, even and high strength filler materials (electrodes) than the parent material depending on the application of the welded structures and the avail... Welding of high strength low alloy steels (HSLA) involves usage of low, even and high strength filler materials (electrodes) than the parent material depending on the application of the welded structures and the availability of the filler material. In the present investigation, the fatigue crack growth behaviour of weld metal (WM) and heat affected zone (HAZ) regions of under matched (UM), equal matched (EM) and over matched (OM) joints has been studied. The base material used in this investigation is HSLA-80 steel of weldable grade. Shielded metal arc welding (SMAW) process has been used to fabricate the butt joints. Centre cracked tension (CCT) specimen has been used to evaluate the fatigue crack growth behaviour of the welded joints. Fatigue crack growth experiments have been conducted using servo hydraulic controlled fatigue testing machine at constant amplitude loading (R=0).A method has been proposed to predict the fatigue life of HSLA steel welds using fracture mechanics approach by incorporating influences of mismatch ratio (MMR) and notch location. 展开更多
关键词 Shielded metal arc welding High strength low alloy steel Mismatch ratio Notch location fatigue crack growth fatigue life
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Effects of Mn on Microstructures and Properties of Hot Rolled Low Carbon Bainitic Steels 被引量:1
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作者 王敏 徐光 +2 位作者 WANG Li XU Yaowen XUE Zhengliang 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2017年第1期186-189,共4页
Two kinds of Mn-Si-Mo low carbon steels were designed to study the effects of Mn on the microstructures and properties of hot rolled low carbon bainitic steels.To reduce the production cost,a very low Mo content of 0.... Two kinds of Mn-Si-Mo low carbon steels were designed to study the effects of Mn on the microstructures and properties of hot rolled low carbon bainitic steels.To reduce the production cost,a very low Mo content of 0.13%was added in both steels.After hot rolling,the mechanical properties of samples were tested.Microstructure was observed and analyzed by optical microscope and transmission electron microscope.The results show that the strength of tested steels increases with the increase in Mn content,while the elongation decreases.When Mn content increases,the bainite microstructure increases.The results can provide a theoretical basis for composition design and industrial production of low cost low carbon bainitic steels. 展开更多
关键词 MANGANESE low carbon bainitic steel hot rolling strength
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Latest Development and Application of High Strength and Heavy Gauge Pipeline Steel in China 被引量:3
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作者 Zhang Yongqing Guo Aimin +3 位作者 Shang Chengjia Liu Qingyou J. Malcolm Gray Frank Barbaro 《Journal of Mechanics Engineering and Automation》 2016年第1期19-24,共6页
Over the past twenty years, significant advances have been made in the field of microalloying and associated applications, among which one of the most successful application cases is HTP practice for heavy gauge, high... Over the past twenty years, significant advances have been made in the field of microalloying and associated applications, among which one of the most successful application cases is HTP practice for heavy gauge, high strength pipeline steels. Combined the strengthening effects of TMCP and retardation effects of austenite recrystallization with increasing Nb in austenite region, HTP conception with low carbon and high niobium alloy design has been successfully applied to develop X80 coil with a thickness of 18.4 mm used for China's Second West-East pipeline. During this process, big efforts were made to further develop and enrich the application of microalloying technology, and at the same time the strengthening effects of Nb have been completely unfolded and fully utilized with improved metallurgical quality and quantitative analysis of microstructure. In this paper, the existing status and strengthening effect of Nb during reheating, rolling and cooling have been analyzed and characterized based on mass production samples and laboratory analysis. As confirmed, grain refinement remains the most basic strengthening measure to reduce the microstructure gradient along the thickness, which in turn enlarges the processing window to improve upon low temperature toughness, and finally make it possible to develop heavy gauge, high strength pipeline steels with more challenging fracture toughness requirements. As stated by a good saying that practice makes perfect. Based on application practice and theoretical analysis, HTP has been extended to develop heavy gauge and high strength pipeline steels with increasing requirements, including X80 SSAW pipe with a thickness of 22.0 mm and above, X80 LSAW pipe combining heavy gauge and large diameter, heavy gauge X80 LSAW pipe with low temperature requirements, as well as X90 steels. In this paper, alloy design, production processing, as well as mechanical properties and microstructure used for these products would be illustrated. 展开更多
关键词 HTP high strength pipeline steel low carbon bainitic microstructure.
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热冲击高强钢焊接接头的低周疲劳及断裂机理研究
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作者 乐美玉 杨耀宁 欧振敏 《兵器材料科学与工程》 CAS CSCD 北大核心 2024年第3期120-125,共6页
为了研究热冲击下高强钢焊接接头的低周疲劳性能及断裂机理,用电弧焊焊接Q345结构钢,分别在-20~400℃、-40~650℃、-60~900℃下对焊接接头进行循环冲击,用疲劳试验机加载低周疲劳载荷,分析热冲击温度对低周疲劳性能及疲劳强度的影响,并... 为了研究热冲击下高强钢焊接接头的低周疲劳性能及断裂机理,用电弧焊焊接Q345结构钢,分别在-20~400℃、-40~650℃、-60~900℃下对焊接接头进行循环冲击,用疲劳试验机加载低周疲劳载荷,分析热冲击温度对低周疲劳性能及疲劳强度的影响,并用扫描电子显微镜等分析焊接接头的断裂机理。结果表明:相同疲劳加载次数下,焊接接头的总应变幅值随热冲击循环次数的增加匀速下降;相同热冲击循环次数下,疲劳加载次数越多,焊接接头的应变幅值越小;相同疲劳加载次数和相同热冲击循环次数下,随冲击温度范围的扩大,焊接接头的总应变幅值逐渐减小,但总应变幅值整体变化与冲击温度范围正相关。 展开更多
关键词 高强钢 焊接接头 热冲击 低周疲劳 断裂机理 抗压强度
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温度和应变幅对亚稳奥氏体不锈钢S321低周疲劳行为的影响
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作者 何国球 黎若芸 +2 位作者 周志强 廖逸平 刘胤孚 《同济大学学报(自然科学版)》 EI CAS CSCD 北大核心 2024年第4期604-610,共7页
在室温和650℃的环境下对S321、S321H不锈钢进行了0.5%、0.7%、0.9%应变幅下的低周疲劳试验,并在室温下对S321和S321H开展了多个寿命点的疲劳加载历史试验,结合X射线衍射定量分析测算形变诱发马氏体的含量。结果表明:形变诱发马氏体的... 在室温和650℃的环境下对S321、S321H不锈钢进行了0.5%、0.7%、0.9%应变幅下的低周疲劳试验,并在室温下对S321和S321H开展了多个寿命点的疲劳加载历史试验,结合X射线衍射定量分析测算形变诱发马氏体的含量。结果表明:形变诱发马氏体的生成会导致奥氏体钢持续循环硬化,室温下合金在初次硬化后继续二次硬化,而在650℃下没有形变诱发马氏体生成,合金在初次硬化后进入循环稳定阶段。循环过程中,碳含量越低,形变诱发马氏体含量越多,合金的循环硬化程度更高。两种温度下,两种材料的疲劳寿命在低应变幅下都相差不大,应变幅越大,两种材料的疲劳寿命相差越大,因此,可以考虑服役条件为低应变幅时使用S321不锈钢代替S321H不锈钢。 展开更多
关键词 低周疲劳行为 S321不锈钢 S321H不锈钢 形变诱发马氏体 碳含量 温度
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低合金高强钢的疲劳断裂行为研究
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作者 杨嘉睿 夏斌 《兵器材料科学与工程》 CAS CSCD 北大核心 2024年第5期150-156,共7页
为研究低合金高强钢的断裂机理,以260LAD、340LAD、420LAD材料为例,在高温、低温、酸性腐蚀条件下用万能试验机测试其应力比为0.3、1.0时的疲劳性能。结果表明:高温、低温都会导致试样的应力幅值降低,但在0、600℃下,试样的抗疲劳性能较... 为研究低合金高强钢的断裂机理,以260LAD、340LAD、420LAD材料为例,在高温、低温、酸性腐蚀条件下用万能试验机测试其应力比为0.3、1.0时的疲劳性能。结果表明:高温、低温都会导致试样的应力幅值降低,但在0、600℃下,试样的抗疲劳性能较好;酸性腐蚀溶液对试样影响较大,易疲劳断裂;在pH值为7时,试样的应力幅值较高,抗疲劳性能较好,不会发生严重断裂;其中420LAD的抗疲劳性能最高。 展开更多
关键词 低合金 高强钢 疲劳断裂 高温环境 酸性环境
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回火温度对低碳Fe-Mn-Si-Al高强钢组织和力学性能影响
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作者 徐飞越 李兵 +2 位作者 张鹏 张红霞 邢俊峰 《精密成形工程》 北大核心 2024年第10期190-198,共9页
目的对低碳Fe-Mn-Si-Al高强钢进行不同回火温度研究,以探究适宜的回火温度,避免产生第一类、第二类回火脆性的问题,从而获得性能优良的低碳高强钢。方法首先设计一种合适的热处理工艺对试样进行淬火处理,随后采用光学显微镜、扫描电镜... 目的对低碳Fe-Mn-Si-Al高强钢进行不同回火温度研究,以探究适宜的回火温度,避免产生第一类、第二类回火脆性的问题,从而获得性能优良的低碳高强钢。方法首先设计一种合适的热处理工艺对试样进行淬火处理,随后采用光学显微镜、扫描电镜以及拉伸试验及硬度测试等方法,系统研究低碳Fe-Mn-Si-Al高强钢在200~600℃下的组织转变和力学性能。结果与初始试样相比,试验钢在200~400℃范围内回火时,微观组织类型没有明显变化,随着回火温度上升,铁素体晶界逐渐清晰,并在400℃时在铁素体晶界上析出θ-碳化物(Fe_(3)C);当回火温度在500~600℃时,铁素体发生再结晶现象,晶粒过度长大,导致晶界轮廓模糊。随着回火温度的增加,其试样的抗拉强度逐渐下降,初始试样的抗拉强度为1206.0 MPa,回火600℃时,试样抗拉强度为878.8 MPa。材料的强塑积在回火300、400和600℃时较高,分别为32.8、32.5和33.5 GPa%,而200℃和500℃时较低,分别仅为27.3 GPa%和26.9 GPa%,且200℃是试验钢的第一类回火脆性温度,500℃是试验钢的第二类回火脆性温度。试样的硬度在500℃达到最高,为271.3HV。试样的回火拉伸断口断裂方式为韧性断裂,且都存有明显的韧窝状花样。结论系统分析了不同回火温度对低碳Fe-Mn-Si-Al高强钢组织演变规律和力学性能的影响,得出适宜的回火工艺和不同回火温度下的力学性能。对于此类钢,应避免在200℃和500℃的工作环境下使用。 展开更多
关键词 低碳高强钢 回火温度 微观组织 力学性能 回火脆性
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高碳铬轴承钢的旋转弯曲疲劳性能
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作者 崔少璞 孙晓冉 +3 位作者 宋月 赵楠 王程明 赵中昱 《理化检验(物理分册)》 CAS 2024年第7期28-30,共3页
采用简支梁旋转弯曲疲劳试验机对SUJ2S1高碳铬轴承钢进行旋转弯曲疲劳性能测试,绘制了材料的疲劳极限升降图、疲劳强度-疲劳寿命曲线和存活率-疲劳强度-疲劳寿命曲线。采用场发射电子显微镜对材料发生疲劳断裂的原因进行分析。结果表明... 采用简支梁旋转弯曲疲劳试验机对SUJ2S1高碳铬轴承钢进行旋转弯曲疲劳性能测试,绘制了材料的疲劳极限升降图、疲劳强度-疲劳寿命曲线和存活率-疲劳强度-疲劳寿命曲线。采用场发射电子显微镜对材料发生疲劳断裂的原因进行分析。结果表明:高碳铬轴承钢的疲劳极限为458 MPa,存活率为90%时的疲劳极限为300 MPa;试验钢表面存在机械加工缺陷和Al_(2)O_(3)夹杂物,最终导致材料发生疲劳断裂现象。 展开更多
关键词 SUJ2S1高碳铬轴承钢 疲劳断裂 疲劳极限 存活率-疲劳强度-疲劳寿命曲线 夹杂物
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碳钢地铁车体结构优化设计
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作者 王小霞 牛永刚 丁海斌 《科技创新与应用》 2024年第34期128-131,共4页
该文介绍某出口项目碳钢地铁车体的主要特点和结构形式,采用有限元分析法对车体结构进行静强度和疲劳分析,探讨碳钢车体设计过程中遇到的强度、刚度和疲劳问题及其解决措施。仿真计算结果证明,优化过后的车体底架拼焊端梁、底架变截面... 该文介绍某出口项目碳钢地铁车体的主要特点和结构形式,采用有限元分析法对车体结构进行静强度和疲劳分析,探讨碳钢车体设计过程中遇到的强度、刚度和疲劳问题及其解决措施。仿真计算结果证明,优化过后的车体底架拼焊端梁、底架变截面横梁、焊接司机室结构能够满足工艺性及车体强度标准的要求;优化过后的头车一位端结构、车顶与侧墙的连接设计能够满足车体疲劳寿命要求。该文的一些设计方法和思路,能够为后续碳钢地铁车体设计提供一定的设计经验。 展开更多
关键词 碳钢地铁 车体结构 有限元分析 静强度 刚度 疲劳
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Q235和Q345材料的异型管弯曲成型质量的仿真研究
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作者 王翠竹 潘发兴 《模具技术》 2024年第1期71-79,共9页
由于管坯不同材料的力学特性的差异、热硬化指数、厚向异性系数以及延伸率都不同,使得不同强度钢材在弯曲成型过程中出现各种质量问题。为判断不同材料下不同截面大小的异型管弯曲不同角度成型时对管坯质量的影响,建立了Q235和Q345两种... 由于管坯不同材料的力学特性的差异、热硬化指数、厚向异性系数以及延伸率都不同,使得不同强度钢材在弯曲成型过程中出现各种质量问题。为判断不同材料下不同截面大小的异型管弯曲不同角度成型时对管坯质量的影响,建立了Q235和Q345两种材料弯曲30°~90°的12种工况下的有限元模型。研究结果表明:同一截面尺寸的不同材料,对管坯中面高度缩减率和壁厚减薄率影响规律一致;不同截面尺寸大小的同一材料,其最大中面高度缩减率和最大壁厚减薄率数据相差甚大;临界弯曲角度为60°,超出临界弯曲角度,管坯截面尺寸小且大角度弯曲时,其最大壁厚减薄率呈急速加大趋势,此时严重影响管坯成型质量。 展开更多
关键词 普通碳素结构钢 低合金高强钢 绕弯成型 异型管 有限元模拟
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基于可控低强度材料的型钢灌注桩技术及应用
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作者 余巍 王超 +2 位作者 王宁宁 杨波 王雪婷 《地基处理》 2024年第5期488-496,共9页
城市建设过程中会产生大量的工程渣土、废弃泥浆、建筑垃圾等建筑固体废弃物。为扩展这些建筑固废资源化利用的途径,本文提出了一种基于建筑固废制备的可控低强度材料的型钢灌注桩技术,并应用于基坑工程中。该技术将建筑固废加工成具有... 城市建设过程中会产生大量的工程渣土、废弃泥浆、建筑垃圾等建筑固体废弃物。为扩展这些建筑固废资源化利用的途径,本文提出了一种基于建筑固废制备的可控低强度材料的型钢灌注桩技术,并应用于基坑工程中。该技术将建筑固废加工成具有流动性、自密实的可控低强度材料,灌入机械挖掘形成的桩孔中,经养护凝固后形成具有一定强度与抗渗性能的灌注桩,通过在桩内插入型钢提升抗弯性能,可用于替代基坑工程中常用的钢筋混凝土支护桩。通过工程实践总结了该技术的技术原理与施工流程,并应用于多个工程案例中,结果表明:建筑固废制备的可控低强度材料具有良好的力学性能和抗渗性能,与型钢组合形成的支护结构可满足基坑工程的挡土、止水与变形控制需求;通过调整可控低强度材料的物理力学性质与成孔工艺,可应用于不同的地层条件。与SMW工法桩等依赖原位搅拌工艺的支护桩相比,基于可控低强度材料的型钢灌注桩在硬黏土层、卵砾石层、风化岩层等硬质地层中具有更高的施工效率和成桩质量;而工程经济性对比结果表明,与钢筋混凝土灌注桩相比,可降低约25%的工程造价,且能够消纳利用建筑固废,兼顾经济性与环境友好。 展开更多
关键词 基坑工程 可控低强度材料 型钢 施工工艺 低碳环保 生态工法桩
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基于Reinforcing Steel本构的高强钢筋混凝土柱纤维模型研究 被引量:1
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作者 高立 左工 《世界地震工程》 CSCD 北大核心 2021年第3期129-137,共9页
为了研究HTRB630E级高强钢筋的基本力学参数和疲劳性能,本文进行了应变等幅低周疲劳性能试验,并将试验结果与HRB400级钢筋的结果进行了对比分析。首先,基于应变等幅低周疲劳试验数据点,对OpenSees程序中Reinforcing Steel材料本构的疲... 为了研究HTRB630E级高强钢筋的基本力学参数和疲劳性能,本文进行了应变等幅低周疲劳性能试验,并将试验结果与HRB400级钢筋的结果进行了对比分析。首先,基于应变等幅低周疲劳试验数据点,对OpenSees程序中Reinforcing Steel材料本构的疲劳参数C f、C d和α进行拟合,然后采用拟合的Reinforcing Steel材料本构疲劳三参数,基于OpenSees软件对钢筋混凝土柱有限元纤维模型进行数值模拟,最后将数值结果与试验柱结果对比分析。结果表明:拟合的疲劳三参数对有限元纤维模型有优化效果,为配置HTRB630E级高强钢筋混凝土结构数值纤维模型提供参考。 展开更多
关键词 HTRB630E级高强钢筋 低周疲劳 OPENSEES Reinforcing steel
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Effects of Strain Rate on Low Cycle Fatigue Behaviors of High-Strength Structural Steel 被引量:3
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作者 LUO Yun-rong HUANG Chong-xiang +1 位作者 TIAN Ren-hui WANG Qing-yuan 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2013年第7期50-56,共7页
The low cycle fatigue (LCF) behavior of a high-strength structural steel was investigated in the strain rate range of 4×10^-6 -0.12 s^-1 (0. 001-3 Hz) under constant total strain (±1%) control. The cyc... The low cycle fatigue (LCF) behavior of a high-strength structural steel was investigated in the strain rate range of 4×10^-6 -0.12 s^-1 (0. 001-3 Hz) under constant total strain (±1%) control. The cyclic stress response at all strain rates exhibited behavior of rapid softening in the early stage of fatigue life and subsequent saturation up to failure. It was found that the stress amplitude, the plastic strain amplitude, the plastic strain energy density and the fatigue life depend mainly on the strain rate. The strain rate of 0. 012 s-1 was found as a transition point where the LCF of the steel showed different behavior from low strain rate to high strain rate. The relationship between the time to failure and strain rate was expressed well by a power law relation. The fracture surfaces of the fatigue sam-ples were characterized by using a scanning electron microscope (SEM) and the fracture mechanisms were discussed in terms of time-dependent deformation of the steel. 展开更多
关键词 low cycle fatigue high strength steel strain rate fatigue life
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Masing Behavior and Microstructural Change of Quenched and Tempered High-Strength Steel Under Low Cycle Fatigue 被引量:7
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作者 Feng-Mei Bai Hong-Wei Zhou +4 位作者 Xiang-Hua Liu Meng Song Ya-Xin Sun Hai-Long Yi Zhen-Yi Huang 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2019年第11期1346-1354,共9页
Low cycle fatigue behavior of a quenched and tempered high-strength steel(Q960 E) was studied in the strain amplitude ranging from ± 0.5% to ± 1.2% at room temperature. As a result of fatigue loading, the di... Low cycle fatigue behavior of a quenched and tempered high-strength steel(Q960 E) was studied in the strain amplitude ranging from ± 0.5% to ± 1.2% at room temperature. As a result of fatigue loading, the dislocation structural evolution and fracture mechanism were examined and studied by transmission electron microscopy and scanning electron microscopy(SEM). The results showed that this Q960 E steel showed cyclic softening at different strain amplitudes, and the softening tendency was more apparent at strain amplitude of ±(0.6–1.2)% than that at ± 0.5%. The reduction in dislocation density with increasing strain amplitude is responsible for the softening tendency of cyclic stress with the strain amplitude. The material illustrates near-Masing behavior at strain amplitude ranging from ± 0.6% to ± 1.2%. The near-Masing behavior of Q960 E high-strength steel can be the result of stability of martensite lath at different strain amplitudes. Partial transformation from martensite laths to dislocation cells is responsible for the derivation from ideal Masing behavior. In the SEM examination of fracture surfaces, transgranular cracks initiate on the sample surface. Striations can be found during the crack propagation stage. 展开更多
关键词 HIGH-strength steel low CYCLE fatigue Near-Masing BEHAVIOR MARTENSITE lath
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