Готові списки джерел за темами / Base-plate joint

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Добірка наукової літератури з теми "Base-plate joint"

Автор: Grafiati

Опубліковано: 11 березня 2023

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Статті в журналах з теми "Base-plate joint"

Yan, Hong, Xianze Nie, Lei Zhang, Feng Yang, Mojia Huang, and Tengfei Zhao. "Test and Finite Element Analysis of a New Type of Double-Limb Double-Plate Connection Joint in Narrow Base Tower." Materials 14, no. 20 (October 10, 2021): 5936. http://dx.doi.org/10.3390/ma14205936.

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The connection between the leg members and diagonal members of the urban transmission line tower is mostly in the form of single-limb connection. This paper puts forward a new connection form of pipe double-limb double-plate connection joint, which is based on the model of key joints in an urban narrow base tower structure. The traditional pipe single-limb single-plate and new pipe double-limb double-plate joint are analyzed and studied from three aspects of theory, numerical simulation and experimental study. Through finite element analysis, it is obtained that the section stress of angle steel under eccentric load is 2.05 times of that under axial load, which is basically consistent with the 2.5 times of the theoretical calculation. This shows that the stress of the angle steel in the pipe double-limb double-plate joint is greatly reduced as the axial stress component, which can ensure the safety of the angle steel. Based on the theoretical analysis of the tensile force of two kinds of joints, through the test research and corresponding numerical simulation of pipe single-limb single-plate and pipe double-limb double-plate joints, under the same load, compared with pipe single-limb single-plate joints, the pipe double-limb double-plate joints designed in this paper can greatly reduce the stress of connection plates and members, and compared with the existing joint forms, the bending stress of joint plates can be reduced by about four times, which greatly improves the bearing capacity of the joint. The research on the pipe double-limb double-plate connection joint will provide the basis for the design of new connection joints of narrow base towers in urban areas.

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Karetnikov, D. V., A. S. Tokarev, A. V. Yakhin, and A. M. Fairushin. "Study of corrosion resistance of friction welding joints between tubes and tube plate." Journal of Physics: Conference Series 2373, no. 7 (December 1, 2022): 072017. http://dx.doi.org/10.1088/1742-6596/2373/7/072017.

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Abstract The cost of production and reliability of shell-and-tube heat exchangers is mainly determined by the features of the tube bundle and the joint between tube and tube plate (TTP) in particular. This paper provides a comparative analysis of the weld structure and electrode potential distribution of weld joints and base metal seams simulating the joint between heatexchange tube and tube plate (steel 5CrMo16) using the following welding methods: manual metal arc welding, gas tungsten arc welding and rotating friction welding. Comparison between macro- and microstructures of certain zones of tested welded joints, as well as values of electrode potential at specific points of the base metal and welded joints obtained by various methods, made it possible to conclude the effectiveness of application of specific ways of welding by their effect on corrosion resistance of given assembly.

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DURHAM-SMITH, G., and G. M. MCCARTEN. "Volar Plate Arthroplasty for Closed Proximal Interphalangeal Joint Injuries." Journal of Hand Surgery 17, no. 4 (August 1992): 422–28. http://dx.doi.org/10.1016/s0266-7681(05)80267-0.

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The anatomy and histology of the volar plate at the proximal interphalangeal joint and the mechanism of fracture/subluxation of the base of the middle phalanx in closed proximal interphalangeal joint injuries is reviewed. Our current technique of repair for these injuries and its evolution from Eaton’s original procedure is described. The results of 71 cases of volar plate arthroplasty performed over a five-year period for fracture/subluxations of the proximal interphalangeal joints are presented with follow-up ranging from six months to four years. 62 (87%) patients achieved a stable pain-free joint with a range of motion from 5° to 95° within two months. Complications were uncommon and correctable with an overall eventual patient satisfaction rate of 94%.

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Fu, Qinghong, Xianhua Chen, Degou Cai, and Liangwei Lou. "Mechanical Characteristics and Failure Mode of Asphalt Concrete for Ballastless Track Substructure Based on In Situ Tests." Applied Sciences 10, no. 10 (May 20, 2020): 3547. http://dx.doi.org/10.3390/app10103547.

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Asphalt concrete paved on the surface of a roadbed as a ballastless track substructure has an excellent waterproofing and vibration attenuation performance. However, the mechanical characteristics and the failure mode of this structure under the actions of a cyclic train load and ambient air temperature changes are still unclear. Therefore, a test section of an asphalt concrete substructure was constructed based on a high-speed railway ballastless track project in north China. In situ forced vibration tests and temperature-induced deformation monitoring tests were performed to investigate the mechanical responses of the asphalt concrete, respectively. Test results show that the bottom of the asphalt concrete layer is in the tensile state under the action of the cyclic train load. The surface of the asphalt concrete in contact with the base plate is subjected to tensile stress near the expansion joint under the action of the negative temperature gradient. Changes in the ambient temperature lead to more significant mechanical responses of the asphalt concrete substructure than the cyclic train load, especially near the expansion joint of the base plate. Therefore, the passive tensile failure mode may occur near the expansion joint of the base plate. However, it has also proved that setting isolation layers under the base plate near the expansion joint is an effective method to significantly reduce responses near the expansion joint in this research.

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Dhamotharakannan, Thirumalaikkannan, Paramasivam Sivaraj, M. Seeman, and Visvalingam Balasubramanian. "Mechanical and Metallurgical Characteristics of Rotary Friction Welded Low Carbon Steel Plate/Rod Joints." Key Engineering Materials 934 (November 28, 2022): 153–60. http://dx.doi.org/10.4028/p-51a271.

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This work aims to study the mechanical properties and microstructural characteristics of rotary friction welding of the unsymmetrical (plate/rod) joints of AISI 1018 low carbon steel plate and AISI 1020 low carbon steel rod. The mechanical properties (tensile properties and hardness) were studied. The fractured surface of the tensile specimen was examined by Scanning Electron Microscope (SEM). The tesnile properties (strength and elongation) are higher than the AISI 1018 plate but slightly lower than the AISI 1020 rod due to coarse ferrite grains in the HAZ region of the AISI 1018 plate. The hardness varied from the fully deformed zone (FDZ) to the base metal. The average value of the ultimate tensile strength of the friction welded joint is about 452 MPa. The average value of hardness at fully deformed zone is about 252 Hv, which 32% higher than the base metal.

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Guo, Kang, Guoqing Gou, Hang Lv, and Meile Shan. "Jointing of CFRP/5083 Aluminum Alloy by Induction Brazing: Processing, Connecting Mechanism, and Fatigue Performance." Coatings 12, no. 10 (October 16, 2022): 1559. http://dx.doi.org/10.3390/coatings12101559.

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Carbon fiber reinforced polymer (CFRP) is widely used in the lightweight design of high-speed trains due to its high specific strength. In order to further reduce the weight of the high-speed train body, it is necessary to study the joining process and fatigue properties of CFRP/aluminum alloys (CFRP/Al) structure. In this work, the CFRP plate and 5083P-O aluminum plate were successfully connected by an induction brazing method. The optimum parameters of induction brazing were determined to be an induction temperature of 290 °C, a normal pressure of 200 kPa, and a holding time of 5 s. After the 5083 plate was pre-anodized, the tensile strength of the CFRP/5083 joint reached a maximum value of 176.5 MPa. The anodization process introduced more surface micro-structures on the 5083 plate, leading to a better wetting behavior between CFRP and oxide film. Meanwhile, a new chemical bond, Al-O-C, was also formed at the interface of the CFRP/5083 joint. The fatigue limit of the CFRP/5083 joint was calculated to be 71.68 MPa through high-cycle fatigue (HCF) testing. The fatigue cracks initiated from the interface of CFRP/oxide film, and then propagated to base metal. Finally, the oxide film was peeled off from the base metal under shear stress, which contributed to the fracture of the CFRP/5083 joint. The bonding strength between CFRP and 5083 aluminum alloy is far from the conventional welded joints. Therefore, feasible approaches should be proposed to obtain a more robust bonding between CFRP and aluminum alloy in the future.

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Duan, Peng Yang, Dong Xing Wang, Guo Yan Zhou, and Shan Tung Tu. "Experimental Study on Peeling Properties of T Type Brazing Joint." Key Engineering Materials 795 (March 2019): 116–22. http://dx.doi.org/10.4028/www.scientific.net/kem.795.116.

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As the key component of the high temperature gas cooled reactor (HTGR), the performance of the plate fin heat exchanger determines the working efficiency and life of the HTGR. Although the plate-fin structure has lots of advantages such as high efficiency, compact structure, low manufacturing cost, its application will be affected by the vacuum brazing technology and harsh conditions, like high temperature and high pressure. In the practical application of plate-fin heat exchanger, the process of "splitting" between the fin and the diaphragm is very similar to that of the adhesive joint and the delamination of the composite. In the present study, a T-type specimen was designed for the the peel testing of brazed joints. Five kinds of specimens were designed based on the difference between the weld gap and the thickness of the sample base material. The tests were carried out under 450°C and 650°C at five kinds of loading rates, respectively. The peel force-displacement curves of standard samples were obtained . The maximum peel strength and average peel strength were calculated. In addition, the influence of base metal thickness, brazing gap, loading rate and test temperature on the maximum peel strength were analyzed by controlling variable method. Keywords: brazing joint; T-type peel test

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Kowalik, Marek, Tomasz Trzepiecinski, and Hirpa G. Lemu. "Effect of Pressing Parameters on the Quality of Joint Formation of Heat Exchanger Fins with the Base Plate." MATEC Web of Conferences 290 (2019): 03009. http://dx.doi.org/10.1051/matecconf/201929003009.

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In this paper, the results of experimental and numerical studies on joining the thin fins to the thick base plate of a heat exchanger are presented. The elements of the heat exchanger were joined by using developed method of press forming. The joining technology consists in clamping the sheet metal into the channel of the base plate using a punch with specific geometry. The effect of different configurations of the punch geometry (shape, radius and distance between fin and punch) and the indentation depth on the depth of the interface between the fin and base plate is analysed. Furthermore, the effect of different combinations of fin-base plate materials has been numerically studied. The plate material was the AA2219 -T851 aluminium alloy, while the fins were made of the AA5251 aluminium alloy. The elastic-plastic numerical computations of the joining process have been carried out using the finite element-based MSC.Marc program. It was found that the area of the contact of the fin with the base plate can be optimised by choosing the right parameters of the tool geometry and technological parameters. Experimental research has shown that increasing the punch indentation causes the material to flow in the transverse direction to the punch and the indirect extrusion in the region between the punches.

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Jeongung, Park, and Gyubaek An. "Dissimilar Welding of Low Alloy Steels Welded Joints: Effect of Run-Off and Run-On Plates." Metals 11, no. 4 (April 14, 2021): 642. http://dx.doi.org/10.3390/met11040642.

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The steel run-off plates attached at the start and end of a weld usually have the same material, shape, and groove as the base metal according to the rules for designing and constructing ship steel structures. However, rather than using the same grade of base steel, readily available steel is often used for these plates to increase material utilization. When using dissimilar grade steel as a run-off plate, the physical properties of the base metal may be diluted if the weld joint of the base plate is penetrated, thereby lowering the physical property value of the joint. If the physical properties of the welded part of the real structure are lowered because of the dilution of the properties of the dissimilar grade steel material, the safety of the entire structure can be affected. Therefore, in this study, analyses of the metal microstructure, hardness, impact, and chemical composition were performed on surfaces where the run-off plate was removed after welding to examine the effect of dissimilar run-off plate. The results of this study reveal that the properties of the run-off plate were not diluted toward the base metal and the Charpy impact value at the weld end was up to 48% greater than the impact value at the start of the weld at a temperature of −40 °C.

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Sun, Wei Hua, and Zhi Chao Bi. "Grade E550 Heavy Steel Plate by TMCP for Offshore Energy Exploration." Advanced Materials Research 936 (June 2014): 1146–52. http://dx.doi.org/10.4028/www.scientific.net/amr.936.1146.

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This paper introduces the study and production on steel plate of Grade E550 in60mm thick by Thermo-mechanical processing (TMCP) and tempering for offshoreinfrastructure purpose. The steel plate obtained high strength and goodtoughness in both the base materials and the weld joints. Microstructure and precipitation characteristicswere examined in the plate is comprised of bainite with a small amount ofpre-eutectoid ferrite. Parallel arranged lath bainite characterizes thebainitic structure with high density of dislocations and precipitates. Carbides MxCy averaging 200nm indimension and MC type Carbonitrides in several nano to a dozen nano carbidesdistribute in the bainite ferrite and the bainte lath interfaces. Compatiblemechanical properties were achieved at welded joint. Microstructures were analysed in the welding heataffected zone (HAZ).

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Більше джерел

Дисертації з теми "Base-plate joint"

Družbík, Jiří. "Sportovní hala v Písku." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225533.

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The theme of the master’s thesis is to design steel structures sports hall. The proposal is developed in three variants according to ČSN EN. The work addresses the static effect of the steel structure and design of parts and materials design. Plan dimensions are 60x38m, max. internal height is 9,3m. The structure is designed for ultimate limit states and serviceability. The supporting structure is designed as roof arches surround an elliptical girder. In both gable walls are designed steel columns. The work also details and solution design. Sports hall was solved in Scia Engineer 2011 and includes a drawing documentation.

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Thomanková, Lucie. "Nosná ocelová konstrukce prodejny a opravny automobilů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225691.

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Diploma thesis includes design and examination of steel load-carrying structure. Construction includes car deal warehouse and car repair shop with extension for car varnishing. Car deal warehouse has ground dimensions 22 x 30 m and total high 10 m. Main frame is composed of Vierendeel trusses with arc shape. Car repair shop has ground dimensions 20 x 30 m and total high 10 m. Main frame is composed of truss girders and web-plate columns. Frame extension has ground dimension 20 x 10 m and total high 6,4 m. Cladding is composed of sandwich panels. Store´s gable wall and a part of the roof are glass. Climatic load is intended for locality Ostrava.

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Jetonický, Pavel. "Vícepodlažní budova." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226049.

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The subject of the master´s thesis is the design and assessment of the static load-bearing steel structure office building. It is an eight-storey building with a floor plan and dimensions 54x15m. The proposal has three variants. In one of them a steel frame with a hinge attached elements. These are the pillars, beams, trusses, joists and purlins, which are coupled with trapeze plate and thereby secure the stability of the position in the horizontal direction. The steel structure is placed between the reinforced concrete towers.

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SUNG, CHUN-HSUN, and 宋俊勳. "Vibration response of the rail long base plate and switch joint board." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/g728j3.

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碩士
中國科技大學
土木與防災設計系
106
The railroad switch can convert turnout or lock the turnout in the traffic control system of MRT and its function is to convert electric multiple units to the tracks in different directions and change the driving direction, so it is quite important equipment. The long base plates at the rail end will produce violent vibration when the electric multiple units pass by, thus making the connection piece of the railroad switch vibrate and causing damages to the railroad switch and its concrete base. Thus, the connection piece of the railroad switch must avoid the resonance with the long base plate. This research conducted analysis on the thickness of different connection pieces of railroad switch and the vibration behavior of long base plate on the side of the rail and other components in order to avoid the amplification effect of excessive vibration, and finally the appropriate thickness of the connection piece was sought and the reasons for the damage to the concrete base of railroad switch were explored from the measurement results of the detection in combination with the actual dynamic detection of long base plates on site.

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Частини книг з теми "Base-plate joint"

Baldassino, Nadia, Martina Bernardi, and Riccardo Zandonini. "Monotonic and Cyclic Behaviour of Base-Plate Joints of Steel Storage Racks: An Experimental Study." In Lecture Notes in Civil Engineering, 303–10. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-03811-2_29.

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Razali, Zol Bahri, Mohamed Mydin M. Abdul Kader, Mohd Hisam Daud, and Khor Wen Hwooi Stephen. "Analyses on Engineering Mechanics of Robotic Arm for Sorting Multi-Materials." In Handbook of Research on Advanced Mechatronic Systems and Intelligent Robotics, 176–208. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-0137-5.ch008.

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The study involves static analysis on the developed robotic arm. Increasing loads are applied to the robotic arm to determine the maximum load that it can hold. Firstly, the robotic arm model is created using CATIA. Then, it is analyzed using the generative structural analysis tool in the same software. Increasing loads are applied to the end of the robotic arm until significant deformation occurs. The same procedure is done for modified designs in the analysis software. The results considered include displacement and stress. Based on the results, the critical stress areas are near to the rotating joints of the robotic arm, the back of the gripper and the sharp edge of the second arm. Proposed modifications include increasing the servo motor shaft radius and edge filleting the affected area, increasing the thickness and reducing the length of the gripper base plate, and implementing a new design for the second arm.

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Тези доповідей конференцій з теми "Base-plate joint"

Baldassino, Nadia, Martina Bernardi, and Riccardo Zandonini. "An experimental investigation on base-plate joints of steel storage pallet racks." In IABSE Symposium, Prague 2022: Challenges for Existing and Oncoming Structures. Zurich, Switzerland: International Association for Bridge and Structural Engineering (IABSE), 2022. http://dx.doi.org/10.2749/prague.2022.0594.

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<p>Adjustable storage pallet racks are framed structures commonly made of cold-formed steel profiles. The performance of these structures is strongly influenced by the beam-to-column and the base- plate joints behaviour. The key role of joints is even more significant in seismic loading conditions. The complexity of their non-linear and non-symmetric behaviour calls for their experimental characterisation both in monotonic and cyclic range. In recent years, attention has been paid to the study of beam-to-column joints, while the knowledge on the base-plate joints response is still quite limited. This gap is even more evident when the cross-aisle (transversal) direction and the cyclic range are considered. The research presented in this paper focuses on the monotonic and cyclic experimental response of a typical rack base-plate joint, tested both in down-aisle (longitudinal) and cross-aisle direction. The main features and outcomes of the study are presented and discussed.</p>

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Jodai, Yoshifumi, Yoshikazu Takahashi, Masashi Ichimiya, and Hideo Osaka. "The Effects of Splitter Plates on Turbulent Boundary Layer on a Long Flat Plate Near the Trailing Edge." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37060.

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An experimental investigation has been made on a turbulent boundary layer near the trailing edge on a long flat plate. The flow was controlled by an additional splitter plate fitted to the trailing edge along the wake center line. The length of the splitter plate, l, was varied from a half, to five times the trailing edge thickness, h. Measurements of base pressure behind the trailing edge and of mean velocity and pressure distribution in the turbulent boundary layer on the flat plate were made under the freestream zero-pressure gradient. The absolute value of the base pressure coefficient of the long flat plate was considerably smaller than that of the short flat plate without the splitter plate. A significant increase in the base pressure coefficient was achieved with the splitter plate (l / h ≧ 1), fitted to the long flat plate. Within an inner layer in the turbulent boundary layer near the trailing edge, the mean velocity increased more than that in the upstream position in the case without the splitter plate. With the splitter plate, however, the base pressure rise made the mean velocity distribution more closely approach that of a fully-developed turbulent boundary layer.

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Zhu, Min, Yansong Zhang, Qiao Zheng, Wei Wu, Weifang Qian, and Baosen Wang. "Influence of Welding Sequence on Residual Stress Evolution in SUS304/Q235 Bimetallic Clad Plate Butt-Welded Joints." In ASME 2021 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/imece2021-69766.

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Abstract Residual stress prediction and controlling is important for structural integrity assessment of weldments. In current work, finite element and experimental methods were integrated to study the influence of welding sequence on the SUS304/Q235 bimetallic clad plate joints during multi-layer and multi-pass welding. The results show that the peak residual stress values on flyer plate surface are weakly affected by welding sequences but the width of high surficial longitudinal stress area of joint with base layer welded first is bigger. Meanwhile, welding sequence has a great influence on the longitudinal residual stress evolution law inside joints. When base seam layer is welded first, the highest stress concentration appears in the transition layer. However, it would be transferred into the first base seam layer due to martensite phase transformation when flyer seam layer is welded first. Residual stress controlling in the bimetallic clad plate joint should attract more attention from researchers.

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Tangtragulwong, Potchara, Gary T. Fry, David D. Davis, and Richard P. Reiff. "Tie-Plate Cracking on Wood/Composite Ties: A Parametric Study." In 2011 Joint Rail Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/jrc2011-56067.

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Composite ties are commonly used as a replacement for wood ties because of many advantages. For example, composite ties show higher decay and corrosion resistance, greater compatibility with available fastening methods, and the ability to be inter-mixed with wood ties. However, recently, premature fatigue failures of tie plates installed on composite ties have been found at the TTCI test facility, while no failures had been found in tie plates installed on wood ties. This paper presents an investigation of tie plate failures using finite element analysis. A full-scale finite element model of the involved components—consisting of axle, wheel, rail, tie plate, and tie—is developed with an application of vertical and lateral loads on the axle. Three contact interfaces—between wheel-rail, rail-tie plate, and tie plate-tie, are defined to simulate actual operational configuration. To investigate the bending stresses in tie plates as a result of wheel-rail rolling contact, a parametric study of the elastic modulus of the ties, and the applied vertical and lateral wheel loads is examined. Results show that 1) given typical vertical and lateral loads, the decrease of tie’s elastic modulus increases transverse (bending) stresses at the base of the tie plate; thus, promoting high-cycle fatigue failures, and 2) in addition to the vertical load, the lateral loads also have a significant effect on the bending stress in the tie plate, 3) spike-hole cracking is the dominant mode of failure in composite ties operated under all simulated load cases, while edge failure is dominant in wood ties operated under a large lateral load.

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Mochizuki, Masahito, and Tomoya Kawabata. "Effect of Undermatched Weld on Deformation and Brittle Fracture Behaviors in High-Tensile Strength Steel Plate Welded Joint." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78813.

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High tensile strength steel such as 950 MPa class is used in hydropower plant components due to its lower cost and higher reliability. This steel is already used for penstocks in the Kanna-gawa and Omaru-gawa hydropower plants in Japan. Proper welding is one of the most critical factors to ensure integrity of the plant components against brittle fracture from weld defects. For example, preheat- and interpass-temperature controls are essential to avoid weld defects and to ensure strength, since the weld process induces residual stress and possible weld deformations such as angular distortion or unevenness. Undermatching (lower strength in weld metal than in the base plate) makes high strength steel plate become easier to use for welding because restrictions in the welding process can be reduced by using softer welding consumables. Tensile strength in welded joints increases near the base plate when the undermatched zone is not much wider than the thickness. When the appropriate welding conditions for assuring strength and preventing brittle fracture are clarified, it becomes clear to be possible to use undermatched joints for penstock. In this paper, numerical simulation of stress-strain behavior during the weld process is performed by considering the microstructural effect due to phase transformation. Phase transformation data is obtained from measured dilatometric curves in continuous cooling transformation (CCT) diagrams. Phase transformation data involves many parameters, including not only the maximum temperature, cooling rate and heat input, but also the superposition of multi heat cycles. Then, the characteristics of deformation and strength in a welded joint of 950 MPa class steel plate for penstock with undermatched region, which is equivalent to using weld material with lower strength level, are discussed to expand the allowable welding conditions in penstock fabrication. Finally, brittle fracture behaviors are discussed by using standard crack-tip opening displacement (CTOD) tests and wide plate tests with through-thickness notch by the welded joint.

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Chen, Zhiwei, Guoyi Yang, Caifu Qian, Xiang Li, and Haoyang Wang. "Tests and Discussions on the Impact Work of the S30403 Austenitic Stainless Steel at 20°C and -196°C." In ASME 2013 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/pvp2013-97167.

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In this paper, impact tests on the S30403 austenitic stainless steel at 20°C as well as −196°C were carried out. Both base plate and welded joint including weld and heat-affected zone are tested to measure the impact work KV2. It is found that when the temperature of the testing environment is decreased from 20°C to −196°C, both the impact work KV2 for the base plate and welded joint are decreased remarkably. Specifically, the impact work KV2 for the base plate decreases by 19–29% while that for the welded joint decreases by as much as 53.8%. In addition, impact tests with different size of specimens show the impact work KV2 with 5×10×55mm specimens is about 0.53–0.54 times that with 7.5×10×55mm specimens, much lower than 2/3, the ratio of two specimens’ cross section areas, indicating that rules in relevant steel or equipment standards regarding impact tests using small specimens need to be revised.

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Terazawa, Yusuke, Katsuyuki Ichimiya, Keiji Ueda, Satoshi Igi, Minoru Suwa, Toshitaka Tanaka, and Akiyoshi Tsuji. "Development of YS 500MPa Class Thick Steel Plate With Weld Joint CTOD Property for Offshore Structures." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95465.

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Abstract Recently, the installation areas of offshore structures has expanded into deep sea areas, and as a result, strength and plate thickness of the steel plate required for the offshore structures have become higher. And the main property of offshore structure steel is the crack tip opening displacement (CTOD) property of multi-pass weld joint. Thus, the developed steel was designed to improve HAZ toughness of multi-pass weld joint. Firstly, in order to achieve both high strength of the base metal and good HAZ toughness, the TMCP technology was applied, and Ceq. was minimized. And to obtain fine HAZ microstructure, fine TiN and Ca(O,S) particles having pinning effect and nucleation site effect were used. Finally, to decrease the formation of brittle martensite-austenite constituent (M-A) in HAZ of multi-pass weld joint, Si content was decreased. By using above technologies, the YS 500MPa class thick steel plate with good weld joint CTOD property have been developed.

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Pandey, K. N., and Saurabh Kumar Gupta. "Fatigue Crack Growth Analysis of Mild Steel Plate Welded by Friction Stir Welding." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-63163.

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Parts and structures are often welded together in different ways, as it is cost and weight effective in comparison to conventional bolted and riveted joints. Steel followed by aluminum alloys, are the most frequently welded metal. Welding results in inhomogeneous and different materials near the joint which may lead to defects. These defects may be the cause of initiation and development of cracks as a result of cyclic loading. In the present work fatigue crack growth rate of a mild steel plate welded by friction stir welding (FSW) has been studied under constant amplitude load with different values of R-ratio. Hardness in the base metal was found to be low in comparison to thermo-mechanically affected and weld nugget zone. Grain size of weld zone was much smaller to base metal and it was the same to heat affected zone and base metal. A C-T specimen with notch at welded and non welded region was tested to get the behavior of Fatigue Crack Growth (FCG) at different zones. It has been found that the fatigue crack growth rate in welded material is lower as compared to base material.

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Toyoda, Masanobu, Noboru Kiji, Yoshiyuki Nakajima, Tetsuo Okada, Yasumasa Nakanishi, and Koutarou Inose. "Safety of Mega Container Ship Focusing on Brittle Crack Initiation and Arrest Behavior of Heavy Thickness Plate." In ASME 2008 27th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2008. http://dx.doi.org/10.1115/omae2008-57375.

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The enlargement of containership requires the higher tensile strength steel and thicker plate around the hatch coaming more than the prescribed classification rules. These call the concerns about the safety of brittle crack initiation and arrestability of hull structure. It is known that increasing of stress and thickness of plates will reduce the toughness of base metal and welding joints. Therefore, the authors conducted to assure the toughness of base metal and welding joint for new higher tensile strength steel of 460MPa yield strength (YP460) and 60mm thickness. It has been considered that weld assembled steel plate structure has some arrestability at intersections of plates, though there are no prescription on the rules. And it was reported that very thicker mother plate has not enough toughness to arrest brittle crack recently. The authors investigated the structural arrestability by model testing and FE analysis and established it. Furthermore, structural details for intersections were also established. Both preventing the brittle crack initiation and arresting the brittle crack of weld structure were described, focusing on developing higher yield strength and heavier thickness of YP460 for containership in this paper.

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Pedapati, Srinivasa Rao, Dhanis Paramaguru, and Mokhtar Awang. "Microhardness and Microstructural Studies on Underwater Friction Stir Welding of 5052 Aluminum Alloy." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71248.

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As compared to normal Friction Stir Welding (FSW) joints, the Underwater Friction Stir Welding (UFSW) has been reported to be obtainable in consideration of enhancement in mechanical properties. A 5052-Aluminum Alloy welded joints using UFSW method with plate thickness of 6 mm were investigated, in turn to interpret the fundamental justification for enhancement in mechanical properties of material through UFSW. Differences in microstructural features and mechanical properties of the joints were examined and discussed in detail. The results indicate that underwater FSW has reported lower hardness value in the HAZ and higher hardness value in the intermediate of stir zone (SZ). The average hardness value of underwater FSW increases about 53% greater than its base material (BM), while 21% greater than the normal FSW. The maximum micro-hardness value was three times greater than its base material (BM), and the mechanical properties of underwater FSW joint is increased compared to the normal FSW joint. Besides, the evaluated void-area fraction division in the SZ of underwater FSW joint was reduced and about one-third of the base material (BM). The approximately estimated average size of the voids in SZ of underwater FSW also was reduced to as low as 0.00073 mm2, when compared to normal FSW and BM with approximately estimated average voids size of 0.0024 mm2 and 0.0039 mm2, simultaneously.

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