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Fatigue Behavior of Connection Plate between Main Girder and Cross Beam in Composite Plate Girder(Welding Mechanics, Strength & Design) 复合板梁主梁与横梁连接板的疲劳性能(焊接力学、强度与设计)
Pub Date : 1986-12-01 DOI: 10.2208/JSCEJ.1987.386_247
K. Horikawa, S. Matsumoto, M. Kitazawa
Since urban freeway bridges were opened for traffic more than ten years ago, there have been so many reports on the necessity of reparing cracks and deformations. For an example, the cracks at the connection plate between girder and lateral load-distribution cross beam are reported, and also the cracks at the connection plate between girder and sway bracings for composite plate girders. The investigation for the cracks, the establishment of repair and reinforcement method, and the feedback to the design standard specifications are now urged and many arguments are in progress in many places. In this research, we would like to find out one of the effective solutions by fabricating the test girders with the previous design and with present design, investigating the effects of the rigidity of the cross beam upon the fatigue crack and comparing and discussing the proposed structual details.
自十多年前城市高速公路桥梁通车以来,有很多关于裂缝和变形修复的必要性的报道。举例说明了梁与横向荷载分配横梁连接板的裂缝,以及组合梁梁与斜撑连接板的裂缝。对裂缝的调查、修补加固方法的制定以及对设计标准规范的反馈是目前迫切需要的,许多地方正在进行许多争论。在本研究中,我们希望通过制作试验梁与以前的设计和现在的设计,研究横梁的刚度对疲劳裂纹的影响,并比较和讨论提出的结构细节,找出有效的解决方案之一。
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引用次数: 0
Joining of Alumina to Copper Using Amorphous Cu-Ti Filler Metal(Materials, Metallurgy & Weldability) 用非晶Cu-Ti填充金属连接氧化铝与铜(材料、冶金及可焊性)
Pub Date : 1986-12-01 DOI: 10.2207/QJJWS.4.321
M. Naka, K. Asami, I. Okamoto
Joining of alumina (99.62mass% Al2O3) to copper was made using amorphous Cu-Ti (34-57 at%) brazing filler metals at 1173 to 1323 K in 2.7•~10-3 Pa. The amorphous filler metals, 1 cm in width and 45 ,um thick, were produced by liquid quenching. The superior flexibility of amorphous filler provides simplicity to joining process. The fracture shear strength of the joints was measured at room temperature. The strength of the joints brazed at 1323 K for 1.8 ks using CusoTiso filler possesses 138.3 M Pa at room temperature. The strength of the joints at constant brazing time raises with an increase in brazing temperature. The strength increases slightly with an increase in titanium content in the filler. At 1298 K for 1.8 ks, the strength of joints at room temperature changes from 107.8 M Pa with Cu66Ti34 to 120.6 M Pa with Cu43Tis7. The strength of the joints was also investigated at high temperatures up to 973 K. The high temperature shear strength is almost constant up to 773 K, and deceases gradually at higher temperature. Isothermal solidification process takes place during joining, and copper dissoves into Cu-Ti filler metal, and then, copper solid solution containing Ti precipitates from Cu-Ti filler metal. On the other hand, the formation of titanium oxide TiO1 and (Al, Ti)2O3 solid solution oxide is attributable to the strong joining between alumina and Cu-Ti filler.
采用非晶Cu-Ti (34-57 at%)钎料,在2.7•~10- 3pa温度为1173 ~ 1323 K的条件下,将氧化铝(99.62质量% Al2O3)与铜钎焊。采用液相淬火法制备了宽度为1cm,厚度为45um的非晶态填充金属。非晶填料优越的柔韧性使其连接工艺简单。在室温下测试了接头的断裂抗剪强度。使用CusoTiso钎料在1323 K下钎焊1.8 K后,接头的室温强度为138.3 M Pa。在一定钎焊时间下,接头强度随钎焊温度的升高而升高。随着填料中钛含量的增加,强度略有增加。在1298 K热处理1.8 K时,接头的室温强度由Cu66Ti34 (107.8 M Pa)变为Cu43Tis7 (120.6 M Pa)。在973 K的高温下,还研究了接头的强度。高温抗剪强度在773 K以下基本保持不变,随着温度的升高而逐渐降低。在连接过程中发生等温凝固过程,铜溶解到Cu-Ti填充金属中,然后从Cu-Ti填充金属中析出含Ti的铜固溶体。另一方面,氧化钛TiO1和(Al, Ti)2O3固溶体氧化物的形成是由于氧化铝与Cu-Ti填料之间的强结合。
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引用次数: 3
Effects of Ultrasonic Vibration on Diffusion Welding of Aluminum(Materials, Metallurgy & Weldability) 超声振动对铝扩散焊接的影响(材料、冶金及可焊性)
Pub Date : 1986-12-01 DOI: 10.2464/JILM.36.498
T. Enjo, K. Ikeuchi, H. Fujita
The ultrasonic vibration has been applied in the diffusion welding of aluminum in an attempt to break up the superficial oxide film of the bond interface. The ultrasonic vibration and subsequent welding have been carried out in a vacuum of 10-2 Pa at 875 K to 893 K under a welding pressure of 1 to 3 MPa. The bond strength increased with the increase in the input power to the transducer and working time of ultrasonic vibration. The increase in pressure to the bond interface during the vibration, however, lowered the bond strength. TEM observation and electric resistance measurement of the bond interface revealed that the application of ultrasonic vibration had the effect of breaking up and dispersing the oxide film, which was closely related to the increase in bond strength. On the fractured surface of joint, dimple patterns, increased with the rise of bond strength. These portions may be regarded as places where the application of ultrasonic vibration promotes breaking up and dispersing the oxide film.
将超声波振动应用于铝的扩散焊接中,试图破坏界面表面氧化膜。在875 ~ 893 K、10 ~ 2 Pa真空条件下,焊接压力为1 ~ 3mpa,进行了超声振动及后续焊接。结合强度随换能器输入功率的增大和超声振动工作时间的延长而增大。然而,在振动过程中,结合界面压力的增加降低了结合强度。结合界面的TEM观察和电阻测量表明,超声波振动的应用对氧化膜有破坏和分散的作用,这与结合强度的提高密切相关。在接头断裂面上,随着结合强度的增加,韧窝图案增多。这些部分可以看作是应用超声波振动促进氧化膜破裂和分散的地方。
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引用次数: 14
Influence of Nitrogen on the Structure and Low Temperature Impact Properties of 304 Type Austenitic Stainless Steel Weld Metals by SMAW Process(Materials, Metallurgy & Weldability) 氮对304型奥氏体不锈钢SMAW焊接金属组织及低温冲击性能的影响(材料、冶金与可焊性)
Pub Date : 1986-07-01 DOI: 10.2207/QJJWS.4.759
T. Enjo, Y. Kikuchi, H. Moroi
Experimental covered electrodes(lime-titania type)were made by selective additions of Mn-nitride or Cr-nitride to the electrode covering. 304LN stainless steel base plates(t=12mm)whose edge preparation was machined to single sided V, 60°included angle were clamped in a jig and were welded together bymulti-pass shielded metal arc welding process.Nitrogen content of wcld metals was adjusted by changing the content of Mn-nltride or Cr-nitride in the electrode covering.Effect of nitrogenon the microstructure of weldmetal, δ-ferrite content, mean grain width, hardness and δ-ferrite secondary arm spacing were studied. Impact test for as welded specimen and solution treated specimen have been carried out at temperature range from 77K to room temperature.Influence of nitrogen on the impact value of wcld metals was mainly discusxsed.Results obtained are summarized as follows:(1)δ-ferrite content in the weld metals is influenced largely by the nitrogen content.(2)Impact value of weld metals increases with increasing of the nitrogen content of the weld metals up to about 1700 ppm after then the impact value falls as the nitrogen further increased.(3)The strengthening mechanism of weld metals due to addition of nitrogen is estimated that the effect of austenitic structure stabilized and inetrstitial solution hardening. Micro fissuring and precipitation of cluster(nitride)in excess of nitrogen containing weld metals decrease the impact value of weld metals.(4)Nitrogen content up to about 1700 ppm of weld metal which is introduced by SMAW process gives a good influence on the impact properties at low test temperature under condition of this study.
通过在电极表面选择性地添加氮化锰或氮化铬,制备了实验覆盖电极(石灰钛型)。304LN不锈钢基板(t=12mm),其边缘加工成单面V形,60°夹角,夹紧在夹具中,通过多道保护金属电弧焊焊接在一起。通过改变电极覆盖层中氮化锰或氮化铬的含量来调节金属氮含量。研究了氮对焊缝金属组织、δ铁素体含量、平均晶粒宽度、硬度和δ铁素体二次臂间距的影响。在77K至室温的温度范围内,对焊接试样和固溶试样进行了冲击试验。重点讨论了氮对世界金属冲击值的影响。结果表明:(1)焊缝金属中δ-铁素体含量受氮含量影响较大;(2)焊缝金属的冲击值随着焊缝金属氮含量的增加而增加,最高可达1700 ppm左右,随后随着氮含量的增加冲击值下降;(3)估计了加入氮对焊缝金属的强化机理,即对奥氏体组织的稳定和氮的固溶硬化的作用。(4) SMAW工艺中引入的高达1700 ppm左右的氮含量对本试验条件下焊缝金属在低温下的冲击性能有很好的影响。
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引用次数: 2
Measuring Theory of Three-dimensional Residual Stresses Using a Thinly Sliced Plate Perpendicular to Welded Line(Welding Mechanics, Strength & Design) 垂直于焊缝的薄板三维残余应力测量理论(焊接力学、强度与设计)
Pub Date : 1985-12-01 DOI: 10.2207/QJJWS.3.611
Y. Ueda, You Chul Kim, A. Umekuni
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引用次数: 12
Characterization of Plasma-sprayed Zirconia Coatings by X-ray Diffraction and Raman Spectroscopy(Materials, Metallurgy & Weldability) 等离子喷涂氧化锆涂层的x射线衍射和拉曼光谱表征(材料、冶金和可焊性)
Pub Date : 1985-05-10 DOI: 10.1016/0040-6090(85)90219-6
N. Iwamoto, N. Umesaki, S. Endo
{"title":"Characterization of Plasma-sprayed Zirconia Coatings by X-ray Diffraction and Raman Spectroscopy(Materials, Metallurgy & Weldability)","authors":"N. Iwamoto, N. Umesaki, S. Endo","doi":"10.1016/0040-6090(85)90219-6","DOIUrl":"https://doi.org/10.1016/0040-6090(85)90219-6","url":null,"abstract":"","PeriodicalId":23197,"journal":{"name":"Transactions of JWRI","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1985-05-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86094306","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 40
Application of Plastic Node Method to Thermal Elastic-Plastic and Dynamic Problems(Welding Mechanics, Strength & Design) 塑性节点法在热弹塑性和动力问题(焊接力学、强度与设计)中的应用
Pub Date : 1983-06-01 DOI: 10.2534/JJASNAOE1968.1983.200
Y. Ueda, K. Nakacho, M. Fujikubo, Yoshikazu Ishikawa
{"title":"Application of Plastic Node Method to Thermal Elastic-Plastic and Dynamic Problems(Welding Mechanics, Strength & Design)","authors":"Y. Ueda, K. Nakacho, M. Fujikubo, Yoshikazu Ishikawa","doi":"10.2534/JJASNAOE1968.1983.200","DOIUrl":"https://doi.org/10.2534/JJASNAOE1968.1983.200","url":null,"abstract":"","PeriodicalId":23197,"journal":{"name":"Transactions of JWRI","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"1983-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90674780","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
An Approach to Viscosity Calculations of Molten Iron and Its Dilute Binary Alloys 铁水及其稀二元合金粘度计算方法研究
Pub Date : 1974-02-01 DOI: 10.2207/QJJWS1943.42.660
I. Okamoto, T. Iida, H. Kihara
At the present time, accurate theoretical values of viscosities are not available. Therefore, in this paper we have proposed an approach to viscosity calculations of molten iron and its dilute binary alloys.Using the expression for pure liquid totals which have been drived by S. Takeuchi and T. lida, the calculated value of viscosity for molten iron at 1600°C is 4.7cP.From the expression and experimental data, we have presented an attempt to calculate viscosities of dilute binary alloys on simple parameters. That is, viscosities of dilute iron based binary alloys are proportional to the square root of the product of atomic weight and melting point, (MTm)1/2, of alloying elements. Viscosities of molten iron due to one atomic percent of various elements at 1600°C are expressed as follows:ηFe⋅dil=ηFe+K[(MT)1/2B-(MTm)1/2Fe]where, K≈3×10-5 (from experimental data)We have obtained same relation for liquid mercury ant its dilute amalgams as well. Consequently, if we obtain experimentally the value K, the approximate values for viscosities of dilute allosy can be calculated.
目前,还没有准确的粘度理论值。因此,本文提出了一种计算铁水及其稀二元合金粘度的方法。利用S. Takeuchi和T. lida驱动的纯液体总量表达式,计算出1600℃时铁水的粘度值为4.7cP。从公式和实验数据出发,提出了用简单参数计算稀二元合金粘度的方法。即稀铁基二元合金的粘度与合金元素的原子量与熔点(MTm)1/2之积的平方根成正比。在1600℃下,不同元素的原子百分数为一的铁水粘度表示为:ηFe⋅dil=ηFe+K[(MT)1/2B-(MTm)1/2Fe],其中K≈3×10-5(从实验数据)我们也得到了液态汞及其稀汞合金的相同关系。因此,如果我们在实验中得到K值,就可以计算稀合金粘度的近似值。
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引用次数: 0
Recent Trend of Researches on Restraint Stresses and Strains for Weld Cracking 焊接裂纹约束应力和应变研究的新动向
Pub Date : 1972-09-01 DOI: 10.2207/QJJWS1943.42.57
K. Satoh, Y. Ueda, H. Kihara
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引用次数: 21
Effect of Residual Stress and Mechanical Heterogeneity on Brittle Fracture Strength of Welded Joints 残余应力和力学非均匀性对焊接接头脆性断裂强度的影响
Pub Date : 1972-09-01 DOI: 10.2534/JJASNAOE1968.1972.355
K. Satoh, M. Toyoda
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引用次数: 3
期刊
Transactions of JWRI
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