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Artykuły w czasopismach na temat „Metallic joints”

Autor: Grafiati

Data publikacji: 6 września 2023

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1

Chernov, Andrey, Danil Fomin, Ivan Kondakov, Ivan Mareskin i Alexander Shanygin. "Lightweight and reliable metal–composite joints based on harmonization of strength properties of joined parts". Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 232, nr 14 (24.05.2018): 2663–72. http://dx.doi.org/10.1177/0954410018778797.

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One of the key problems of designing composite primary aircraft structures is the problem of development of lightweight and reliable joints for such structures. For conventional bolted joints used for connection of laminated composite primary structure elements, the loads are transferred via the contact of metallic and composite parts having considerably different strength and stiffness parameters. As the local strength properties of composites are defined by polymer resins, having several times less strength as compared to the metallic alloys, the maximal load that can be transferred via the joint is limited by the properties of resins. As a consequence, the metallic parts of such joints are loaded to a very low extent, that causes low weight efficiency. In the presented paper, the approach to development of metal–composite joints based on the principle of harmonization is proposed. The harmonization principle is to minimize the disbalance of strength properties of metallic and composite parts in the local zones of contact. This principle can be realized by two ways: either by removing the resin from the zone of contact to increase local stiffness of composite part (“stiff” joint concept) or by creation of metallic part with porous structure to decrease local stiffness of the metallic part (“soft” joint concept). In this paper, the evaluation of both concepts is given, based on numerical and experimental investigations carried out in this work.

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2

Scherman, Eero, Eerik Sikanen, Hemantha Kumar Yeddu, Mohsen Amraei i Jussi Sopanen. "Microstructure and Mechanical Properties of Steel and Ni-Based Superalloy Joints for Rotors of High-Speed Electric Motors". Materials 15, nr 19 (5.10.2022): 6906. http://dx.doi.org/10.3390/ma15196906.

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High-speed electric motors, e.g., axially laminated anisotropic synchronous reluctance motors (ALA-SynRM), use a solid rotor manufactured by joining alternating layers of magnetic and non-magnetic metallic sheets. The strength of the dissimilar metallic joints is critical for the rotor’s ability to withstand the operating conditions of the high-speed electrical machine. In this work, various dissimilar metallic joint configurations that can be used in high-speed ALA-SynRM rotors are studied by analyzing the shear strength, microstructure, hardness, and composition of the joints. Metallic joints of structural steels and Inconel® alloys fabricated by vacuum brazing and hot isostatic pressing (HIP) are studied. Finite element analysis (FEA) was performed to calculate the maximum shear stress of the joints that were subjected to various high speed operating conditions. The shear strength of the test specimens was measured and compared with FEA results. The microstructure and chemical composition of the joints were studied by using optical microscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) on SEM. The results show that the hot isostatic pressed S1100MC-IN718 joint achieved the highest ultimate shear strength (233.3 MPa) followed by vacuum brazed S355MC-IN600 joint (230.1 MPa) and HIP S355-IN718 (203.5 MPa), thereby showing that vacuum brazing and HIP can be viable manufacturing methods to fabricate a high-speed ALA-SynRM rotor.

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3

Padmanabhan, K. K., i A. S. R. Murty. "Damping in Structural Joints Subjected to Tangential Loads". Proceedings of the Institution of Mechanical Engineers, Part C: Mechanical Engineering Science 205, nr 2 (marzec 1991): 121–29. http://dx.doi.org/10.1243/pime_proc_1991_205_099_02.

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Metallic mating surfaces in machine joints offer an excellent source of energy dissipation, resulting in damped dynamic structural response, for example in machine tools. This paper describes the results of a series of experiments where the energy loss per cycle occurring at preloaded flat metallic interfaces subjected to cyclic tangential forces are measured. The effects of certain pertinent joint variables on the joint damping effectiveness are investigated. The results should be useful to the designers of machine tool structures, where damping occurring in joints is important.

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4

Maier, Raluca. "Study on Increasing Performances of Hybrid Composite Through Pull Out Compression Test Assessement". Materiale Plastice 57, nr 1 (17.04.2020): 329–35. http://dx.doi.org/10.37358/mp.20.1.5325.

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The exhaustive use of light advanced polymer composites into the development of the future high-efficiency long-range commercial aircrafts (primary) structures for increasing strength while decreasing weight for lower fuel consumption and less pollution has attracted great attention in the last decade. In this context, solutions for the integration and joining composites into the aircraft structures metallic sub-assemblies or components, while providing the necessary strength to sustain heavily loaded joints, are urgently required. The paper comes to meet an area of interest for many researchers and large integrators and manufacturers, by presenting several type of metallic join geometrical designs, along with metallic joint part integration solutions into a composite structure directly during production. Performances evaluation of the developed metallic join geometrical designs was performed in static regime by means of �pull-out� compressive tests. The paper focuses on the strength of the hybrid metallic/advanced polymer composites joints. It was concluded that an efficient design of the metallic joint and a proper transition from hybrid to the composite structure can lead to proper integration solutions while assuring safety requirements.

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5

Wang, Haipeng, Peng Yan i Yingchun Guan. "Robust Heterojunctions of Metallic Alloy and Carbon Fiber-Reinforced Composite Induced by Laser Processing". Materials 14, nr 23 (6.12.2021): 7469. http://dx.doi.org/10.3390/ma14237469.

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The development of heterojunctions with a strong bonding interface between metals and non-metals has attracted much attention owing to their great potential for use in lightweight structures. Laser joining technology, which emerged as a fast and reliable method, has proven its feasibility and unique advantages in joining metal to polymer matrix composites. Herein, an optimized laser joining configuration has been employed to realize high-quality joining of titanium alloy and carbon fiber-reinforced composite. Cross-sectional microstructures of laser-produced joints reveal that micro-bubbles near the interface have been effectively suppressed and eliminated due to the continual clamping pressure applied to the joined area during the joining process. Tensile tests suggest that the joint strength increases with structure density on a titanium alloy surface, and the greatest fracture strength of joints reaches more than 60 MPa even after experiencing a high–low temperature alternating aging test. For higher structure density (>95%), the joints fail by the fracture of parent plastics near the joined area due to the tensile-loading-induced peel stress at the edges of the overlap region. Otherwise, the joints fail by interfacial shear fracture with breakage when the structure density is lower than 91.5%. The obtained high-performance heterojunctions show great potential in the aerospace and automotive fields.

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6

Khoramishad, H., i S. M. J. Razavi. "Metallic fiber-reinforced adhesively bonded joints". International Journal of Adhesion and Adhesives 55 (grudzień 2014): 114–22. http://dx.doi.org/10.1016/j.ijadhadh.2014.08.005.

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7

Ramful, Raviduth. "EVALUATION OF THE MECHANICAL PROPERTIES OF BAMBUSA BAMBOO CULMS WITH METALLIC JOINTS THROUGH DESTRUCTIVE TESTING". Journal of Green Building 13, nr 2 (marzec 2018): 1–19. http://dx.doi.org/10.3992/1943-4618.13.2.1.

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Bamboo in its raw state is difficult to incorporate in complex structures due to its tubular shape. In this research article, a novel approach to connect bamboo was designed and evaluated in order to integrate sustainable material into modern structures. Several bamboo joints for culm connection were designed based on strength and durability under various loading capacity. The conceptual joints were manufactured and subjected to destructive testing on the Universal Testing Machine, Testometric M500-50AT. From the mechanical properties generated, final modifications and refinements were incorporated into the joint design. Self-drilling metal screw joints were found to be the strongest with a maximum resisting force of around 11 kN in compression and 10 kN in tension. Riveted joints were the second strongest joint, while tightening ring joints, the weakest among the three, could only resist a peak load of 747 N in tension. The joints, designed with metal fittings, proved to be more practical for utilization in assembly design.

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8

Koleňák, Roman, i Maroš Martinkovič. "Shear Strength of Joints Fabricated by Solders with High Indium Content". Materials Science Forum 782 (kwiecień 2014): 461–64. http://dx.doi.org/10.4028/www.scientific.net/msf.782.461.

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Feasibility of pure indium and solders containing high amount of indium as 70In30Sn to wet the different types of metallic and ceramic materials at application of power ultrasound was studied. The shear strength of soldered joints fabricated on metallic (Cu, Ni, Al, Ti, AISI 316 steel) and ceramic substrates was assessed. The shear strength of In solders on Al2O3 and SiC ceramic materials varied from 3.5 to 7 MPa. The shear strength on metallic materials attained from 12.5 to 71 MPa. Joint fracture in most cases occurred in the solder and was of ductile character. Failure took place by shear mechanism.

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9

Poyarkova, E. V., I. R. Kuzeev i K. L. Zabelin. "Assessment of Welded Joints Structure Defectiveness Based on the Presence of Non-Metallic Inclusions". Solid State Phenomena 265 (wrzesień 2017): 65–69. http://dx.doi.org/10.4028/www.scientific.net/ssp.265.65.

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Both welded joints and base metal are arranged at different structural-scale levels. Unlike the base metal, welded joint can have structural inclusions of complex composition and spatial geometry. During simulation and forecasting of behavior of various characteristics and properties, welded joints quality assessment is not possible without performance of corresponding metallographic studies. The article discusses the non-metallic inclusions in the oxide and silicate types welding joints and their influence on the formation of the metal mechanical properties.

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10

Razavi, S. M. J., i F. Berto. "Experimental Investigation of Metallic Fiber-Reinforced Adhesively Bonded Joints under Bending". Key Engineering Materials 754 (wrzesień 2017): 252–55. http://dx.doi.org/10.4028/www.scientific.net/kem.754.252.

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In the current paper, the geometric and material parameters of metal fibers utilized for strengthening adhesively bonded single lap joints under flexural loading were investigated by using experimental investigations. According to the test results, incorporating metal fibers in the adhesive layer of a bonded joint can have a significant impact on the flexural load bearing of the joint. The distance between the fibers and also the fibers orientation were considered as the key parameters in this research. It was concluded that the load bearing of the joint can be improved by reducing the distance between the fibers and the highest failure loads were obtained for the joints reinforced by fibers in the longitudinal direction.

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11

Yang, Li, i Na Zhang. "Study on the Weldability of S32205 Steel under Different Welding Processes". Advanced Materials Research 239-242 (maj 2011): 793–96. http://dx.doi.org/10.4028/www.scientific.net/amr.239-242.793.

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The effect of different welding methods on joints’ microstructure and properties of A240-S32205 duplex stainless steel was studied. The result showed all joints using GTAW and SMAW can attain good phase ratio and corrosion resistance. But the comprehensive mechanical characteristics of joint using GTAW was better than that of SMAW joint with acid electrode. Besides, the low temperature impact performance was not ideal in joints manual welded with acid electrode. The HAZ was identified as a weak zone where the corrosion resistance was the worst and in which the third detrimental metallic phase was more liable to emerge than in weld zone.

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12

Bula, Karol, Tomasz Sterzyński, Maria Piasecka i Leszek Różański. "Deformation Mechanism in Mechanically Coupled Polymer–Metal Hybrid Joints". Materials 13, nr 11 (31.05.2020): 2512. http://dx.doi.org/10.3390/ma13112512.

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In this, work, metal inserts were joined with polyamide 6 by using the injection-molding technique. The metal parts, made of steel grade DC 04, were mechanically interlocked with polyamide 6 (PA6) by rivets as a mechanical connection between both components in the form of s polymer filling the holes in the metallic parts. The mechanical-interlocking joints made of steel/PA6 were mechanically tested in a tensile-lap-shear test. The damage behavior of the joined materials in relation to rivet number and position on the metal plate was studied. The observation of rivet deformation was also conducted by infrared IR thermography. The study showed that, for polymer–metal joined samples with fewer than three rivets, the destruction of rivets by shearing meant sample damage. On the other hand, when the polymer–metal joint was made with three or four rivets, the disruption mechanism was mostly related to the polymer part breaking. The maximal values of the joint’s failure force under tensile-shear tests were achieved for samples where three rivets were used. Moreover, strong correlation was found between the surface temperature of the samples and their maximal force during the tensile-lap-shear test.

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13

Silva, Diogo FM, Ivo MF Bragança, Carlos MA Silva, Luis M. Alves i Paulo AF Martins. "Joining by forming of additive manufactured ‘mortise-and-tenon’ joints". Proceedings of the Institution of Mechanical Engineers, Part B: Journal of Engineering Manufacture 233, nr 1 (27.07.2017): 166–73. http://dx.doi.org/10.1177/0954405417720954.

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This article is aimed at extending the ‘mortise-and-tenon’ joining concept commonly utilized in corner or tee joints to lap joints in which one sheet is partially placed over another without any change in their shape. The approach makes use of wire arc additive manufacturing to fabricate the tenons and allows various shapes and thicknesses to be made from a wide range of metallic materials. Upset compression of the tenons is utilized to mechanically lock the two sheets being joined. Experimental and finite element simulation works performed with monolithic (aluminium–aluminium) and hybrid (aluminium–polymer) ‘unit cells’ consisting of a single lap joint are utilized to investigate the deformation mechanics and the feasibility of the new proposed joining process. Tensile-shear loading tests were carried out to determine the maximum force that the new proposed joints are capable to withstand without failure. Pull-out forces of approximately 8 and 6 kN for the monolithic and hybrid joints allow concluding on the potential of additive manufactured ‘mortise-and-tenon’ lap joints to connect sheets made from similar and dissimilar materials.

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14

FESSEL, G., J. G. BROUGHTON, N. A. FELLOWS, J. F. DURODOLA i A. R. HUTCHINSON. "Fatigue performance of metallic reverse-bent joints". Fatigue & Fracture of Engineering Materials & Structures 32, nr 9 (wrzesień 2009): 704–12. http://dx.doi.org/10.1111/j.1460-2695.2009.01378.x.

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15

Lascar, G. "Analysis of reactions in ceramic‐metallic joints". Welding International 6, nr 3 (styczeń 1992): 194–211. http://dx.doi.org/10.1080/09507119209548171.

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16

Rufin, Antonio C., i Robert L. Jochum. "Fatigue Analysis and Design of Composite-Metal Joints in Primary Aircraft Structures". Advanced Materials Research 891-892 (marzec 2014): 588–93. http://dx.doi.org/10.4028/www.scientific.net/amr.891-892.588.

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Increasingly broader application of composite materials in commercial airplane primary structure has led to a renewed, more in-depth assessment of the effect composite elements in mechanical joints have on the durability of the metal structure to which they are mated. Thermal stresses, clamp-up loss due to composite creep, composite joint properties, and lightning and electrical grounding effects have been found to be some of the parameters most significantly affecting or limiting the fatigue performance of the metallic constituents within these hybrid joints, influencing the way joint design and analysis are approached.

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17

Harzheim, Sven, Christian Steinfelder, Thomas Wallmersperger i Alexander Brosius. "A First Approach for the Treatment of Galvanic Corrosion and of Load-Bearing Capacity of Clinched Joints". Key Engineering Materials 883 (kwiecień 2021): 97–104. http://dx.doi.org/10.4028/www.scientific.net/kem.883.97.

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Corrosion is a major cause for the failure of metallic components in various branches of the industry. Depending on the corrosion severity, the time until failure of the component varies. On the contrary, a study has shown that certain riveted metal joints, exposed to a short period of mechanical loading and corrosion, have greater fatigue limits. This study gives rise to the question how different corrosion exposure times affect joint metallic components. In the present research, a theoretical approach is developed in order to evaluate the influence of galvanic corrosion on joint integrity of clinched metal joints. At first, the framework for modeling galvanic corrosion is introduced. Furthermore, a simulative investigation of a clinching point is carried out based on the assumption that corrosion leads to a reduction of the contact area which leads to a local increase in contact pressure. For this purpose, the stiffness values of individual elements in a finite element model are reduced locally in the contact area of the undercut and the contact stress along a path is evaluated. Summarizing, a modeling approach is introduced to investigate corrosion effects on load-bearing behavior of clinched joints.

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18

Gutmann, Florian, Maximilian Stilz, Sankalp Patil, Frank Fischer, Klaus Hoschke, Georg Ganzenmüller i Stefan Hiermaier. "Miniaturization of Non-Assembly Metallic Pin-Joints by LPBF-Based Additive Manufacturing as Perfect Pivots for Pantographic Metamaterials". Materials 16, nr 5 (22.02.2023): 1797. http://dx.doi.org/10.3390/ma16051797.

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This work introduced additively manufactured non-assembly, miniaturized pin-joints for pantographic metamaterials as perfect pivots. The titanium alloy Ti6Al4V was utilized with laser powder bed fusion technology. The pin-joints were produced using optimized process parameters required for manufacturing miniaturized joints, and they were printed at a particular angle to the build platform. Additionally, this process optimization will eliminate the requirement to geometrically compensate the computer-aided design model, allowing for even further miniaturization. In this work, pin-joint lattice structures known as pantographic metamaterials were taken into consideration. The mechanical behavior of the metamaterial was characterized by bias extension tests and cyclic fatigue experiments, showing superior levels of performance (no sign of fatigue for 100 cycles of an elongation of approximately 20%) in comparison to classic pantographic metamaterials made with rigid pivots. The individual pin-joints, with a pin diameter of 350 to 670 µm, were analyzed using computed tomography scans, indicating that the mechanism of the rotational joint functions well even though the clearance of 115 to 132 µm between the moving parts is comparable to the nominal spatial resolution of the printing process. Our findings emphasize new possibilities to develop novel mechanical metamaterials with actual moving joints on a small scale. The results will also support stiffness-optimized metamaterials with variable-resistance torque for non-assembly pin-joints in the future.

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19

Jaszak, Przemysław, Janusz Skrzypacz i Konrad Adamek. "The design method of rubber-metallic expansion joint". Open Engineering 8, nr 1 (26.12.2018): 532–38. http://dx.doi.org/10.1515/eng-2018-0065.

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Abstract The paper present the method of designing a rubber expansion joints, intended for operation in the pressure class 25 bar. During the design used a numerical analysis,which based on the finite element method (FEM). The results from experimental test were used to correctly modeled the rubber or polyamide reinforcement. Basis on the obtained results, the hyperelastic model of the rubber was prepared, then the design of the rubber expansion joint was tested in different load case, i.e tensile or compressive deflection and pressurization.

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20

Zhu, Yong Hui, Hui Chen, Zhong Yin Zhu, Chuan Ping Ma, Li Jun Wang, Gui Guo Wang i Jin Peng Yu. "Research on the Failure Mechanism of Flash Welded Rail". Advanced Materials Research 314-316 (sierpień 2011): 1100–1106. http://dx.doi.org/10.4028/www.scientific.net/amr.314-316.1100.

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For the high speed train, safety is the most important factor. Flash welding is the primary technology for the seamless line rail in Chinese railway. So the quality of the flash welded joints is the most important. This paper presents the situation of joint fracture in rail flash welding joints and analyses the failure mechanism through macroscopic and microscopic observation. The result demonstrate that the cracking of the rail is fatigue-crack propagation，the fatigue cracking is caused by alumina calcium-Aluminates-non-metallic inclusion．

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21

Garcia-Poulin, Mikel, i Majid Bahrami. "Thermal Contact Resistance at Rough Ceramic–Metallic Joints". Journal of Thermophysics and Heat Transfer 33, nr 4 (październik 2019): 1153–60. http://dx.doi.org/10.2514/1.t5684.

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22

Srinath, M. S., Apurbba Kumar Sharma i Pradeep Kumar. "Microwave processing of metallic joints and their characterisation". i-manager's Journal on Mechanical Engineering 1, nr 1 (15.01.2011): 21–25. http://dx.doi.org/10.26634/jme.1.1.1213.

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23

Abd-Elhady, Amr A., i Hossam El-Din M. Sallam. "Crack sensitivity of bolted metallic and polymeric joints". Engineering Fracture Mechanics 147 (październik 2015): 55–71. http://dx.doi.org/10.1016/j.engfracmech.2015.08.005.

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24

Xu, Wei, i Yueguang Wei. "Strength analysis of metallic bonded joints containing defects". Computational Materials Science 53, nr 1 (luty 2012): 444–50. http://dx.doi.org/10.1016/j.commatsci.2011.09.008.

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25

Singh, Kulwinder, J. S. Saini i H. Bhunia. "Effect of Metallic Inserts on the Strength of Pin Joints Prepared from Glass Fiber Reinforced Composites". Defence Science Journal 67, nr 5 (19.09.2017): 592. http://dx.doi.org/10.14429/dsj.67.11041.

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The present study deals with the failure analysis of pin joints by varying different geometric parameters i.e., edge distance to hole diameter (E/D) ratio and width to hole diameter (W/D) ratio. Pin joints were prepared from the glass fiber reinforced laminates incorporating the metal inserts. A range of 2 to 5 and 3 to 6 was considered for E/D and W/D ratios, respectively. The stress around the hole was redistributed by incorporating the metal inserts in the hole to increase the load carrying capacity. To predict the failure loads and failure modes numerically, progressive damage analysis along with Hashin failure criteria was used in the pin joints. Strength of the pin joints increased in the range of 65 per cent to 92 per cent with metal insert due to the redistribution of the stresses around the hole. Progressive damage analysis gave a good correlation with experimental findings. Thereafter, the strength of the joint was predicted by varying the thickness of the metal inserts.

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26

May, Michael. "Rate-Dependent Material Properties of Adhesively Bonded Joints - Must Have or Nice to Have?" Key Engineering Materials 858 (sierpień 2020): 14–19. http://dx.doi.org/10.4028/www.scientific.net/kem.858.14.

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In the context of automotive crash simulation, rate-dependent properties are sought for all materials undergoing deformation. Measuring rate-dependent properties of adhesively bonded joints is a challenging and associated with additional cost. This article assesses the need for having rate-dependent properties of adhesively bonded joints for the example of a typical automotive structure, an adhesively bonded metallic T-joint. Using Finite Element simulation it could be shown that good agreement between experiment and simulation was only achieved if rate-dependent properties were considered for the adhesive.

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27

Yang, Jie, i Lei Wang. "Effect Range of the Material Constraint-I. Center Crack". Materials 12, nr 1 (25.12.2018): 67. http://dx.doi.org/10.3390/ma12010067.

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Material constraints are important factor effects on the fracture behavior of welded joints. The effect range of the material constraint is an important and interesting issue which needs to be clarified, including whether the effect range of a material constraint exists or not, who will affect it, and whether the material constraint is affected by the no adjacent area or not. In this study, different basic models which reflect different single metallic welded joints, bimetallic welded joints and dissimilar metal welded joints were designed, and the fracture resistance curves and crack tip strain fields of the different models with various material constraints were calculated. Based on the results, the questions above were answered. This study has significance for developing solid mechanics, optimizing joint design, structure integrity assessment, and so on.

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Thorkildsen, R., O. Reigstad i M. Røkkum. "Chrome nitride coating reduces wear of small, spherical CrCoMo metal-on-metal articulations in a joint simulator". Journal of Hand Surgery (European Volume) 42, nr 3 (25.10.2016): 310–15. http://dx.doi.org/10.1177/1753193416674161.

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Metal-on-metal articulations have fallen out of favour in larger joint replacements, but are still used in smaller joints. Coating the articulation has been suggested as one way of reducing wear. We compared a standard 6 mm CrCoMo articulation designed for the carpometacarpal joint of the thumb with a chromium nitride-coated version after 512,000 cycles in a joint simulator. A total of 6 articulations in each group were tested with a unidirectional load of 5 kg in Ringer’s solution. We found a statistically significant reduction in weight loss, amount of metallic wear produced and volumetric wear for the chromium nitride-coated articulation. Our findings support the use of chromium nitride coating in order to minimize the amount of metallic wear produced.

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29

Song, Xiao Cun, Zheng Qiang Zhu i Yan Fei Chen. "Ultrasonic Welding of Fe₇₈Si₉B₁₃ Metallic Glass". Materials Science Forum 809-810 (grudzień 2014): 348–53. http://dx.doi.org/10.4028/www.scientific.net/msf.809-810.348.

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The solid bonds of multi-layer Fe78Si9B13metallic glass foils have successfully been produced by ultrasonic welding technology. The interface of weld joints was investigated by Optical micrograph (OM), scanning electron microscope (SEM) observation, micro-area X-ray diffraction (micro-XRD) and differential scanning calorimetry (DSC) analysis. The results demonstrate that no visible interface and defects were observed and the amorphous structure was maintained. The thermal properties of the joined metallic glasses were the same as that of the parent metallic glass. The formation of joining metallic glasses was attributed to the superplastic flow and the thermal stability at elevated temperatures in the supercooled liquid state. Ultrasonic welding as tack welding proposes an effective method for the preparation of bulk metallic glasses (BMGs) and lays the foundation for its future applications.

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30

Codrean, Cosmin, Aurelian Magda, Mircea Burcă i Dragoş Buzdugan. "Advanced Metallic Materials with Amorphous Structure Used for Resistance Brazing Joints". Advanced Materials Research 1111 (lipiec 2015): 37–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1111.37.

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In this paper will be presented experimental researches on development advanced alloys with amorphous structures based on Ni and Cu for resistance brazing joints. The main advantages of these amorphous alloys in shape of ribbons are their ductility and flexibility. These ribbons are obtained by ultra-rapid cooling of the melt. Using resistance brazing process, were obtained brazing joints of stainless steel and copper strips. The joints were mechanical and structural analysed. It was performed mechanical shear test on the brazed joints to establish the shear strength of the joints, and also it was performed structural investigation to emphasize the microscopic structure and the structural transformations that take place in the base material and brazing alloys during the brazing process.

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31

Hart-Smith, L. J. "An Engineer'S Viewpoint on Design and Analysis of Aircraft Structural Joints". Proceedings of the Institution of Mechanical Engineers, Part G: Journal of Aerospace Engineering 209, nr 2 (kwiecień 1995): 105–29. http://dx.doi.org/10.1243/pime_proc_1995_209_278_02.

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The design of structurally efficient joints in aircraft fuselage structures and wing skin splices is addressed. It is contended that the joints should be designed first and the gaps in between filled in afterwards, taking pains not to optimize the basic structure first and then discover that it either cannot be assembled or that, when it is assembled, it is full of weak-link fuses. Both adhesively bonded and mechanically fastened joints are covered. Analogies are drawn between the characteristics of both classes of joints. The aspects of static joint strength and fatigue lives are included. The work is applicable to metallic as well as composite structures, and covers both high-load wing joints which have already been tested and new ideas for fuselage splices which have not. The effects of flaws and defects are associated with the need for damage tolerance, particularly in fuselage structures.

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Oancă, Octavian Victor, Nicușor Alin Sîrbu, Emilia Florina Binchiciu, Gabriela Victoria Mnerie i Ion Aurel Perianu. "Method and Technologies Functional Constructive Configuration Concept of a Flexible Unconventional Hybrid FSW-US Welding Process". Advanced Materials Research 1153 (maj 2019): 85–91. http://dx.doi.org/10.4028/www.scientific.net/amr.1153.85.

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The hybrid unconventional technology friction stir welding assisted by ultrasonic vibration (FSW-US) is a technology that is of interest internationally, it provides certain advantages in improving the behavior of welding components during their processing, as well as their mechanical properties and quality of joints resulted from our experiments. Within ISIM Timisoara, we aim to develop specialized non-conventional welding technologies and experimental modules (FSW-US) designed to make joints for metallic and non-metallic materials, with industrial and applications pre-competitive.

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Nestler, Daisy, Claudia Döhler, Bernhard Wielage i Guntram Wagner. "Surface and Fracture Surface Analysis of Thermally Bonded Metal/FRP Joints". Materials Science Forum 825-826 (lipiec 2015): 328–35. http://dx.doi.org/10.4028/www.scientific.net/msf.825-826.328.

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The increasing implementation of fibre-reinforced plastics (FRP) leads to a broad utilization of metal/FRP joints. The examination of adhesively bonded metal/FRP joints is focusing on the maximum joint strength and the surface pretreatment used to promote it. A deeper understanding of the mechanisms behind the correlation is lacking. Along with the chemical condition of the surface (free chemical bonds, polarity, etc.) the surface morphology plays an important role. This study addresses the connection between the surface morphology and joint strength. The investigation of the surface morphology of the metallic joining area and the fractured surface of both joining partners by means of imaging and tactile methods and the results are presented.

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Subramanian, Sankara J., i Vijay K. R. Penmetcha. "Strain Evolution during Lap Shear Testing of SnCu Solder". Applied Mechanics and Materials 70 (sierpień 2011): 303–8. http://dx.doi.org/10.4028/www.scientific.net/amm.70.303.

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The lap-shear test is frequently used in the microelectronics industry to obtain mechanical properties of solder joints. In these tests, solder joints formed between slender metallic substrates are pulled apart in a simple shear configuration. Although it is known that calculation of stress-strain curves from lap shear tests is not straightforward due to rotation of the joints and strain inhomogeneity within the joint, these tests still find widespread use due to their simplicity and apparent ease of use. Chawla and co-workers [1, 2] show that the state of strain near the solder-substrate interfaces is significantly different from that in the interior of the joint and that this effect is only minimized for large joints. In the present work, we offer experimental evidence for these conclusions by presenting full-field strain measurements on solder joints in double-lap shear configuration, obtained using Digital Image Correlation (DIC). While confirming that significant strain gradients exist within the joint, the present work also indicates that a simple calculation of shear strain as axial displacement of the joint divided by joint thickness is misleading due to the presence of a significant gradient of the transverse displacement along the loading direction. This gradient persists through the course of the deformation and results in the actual average shear strain in the joint being smaller than that computed from the axial displacement alone.

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Saravanan, J., i G. Kumaran. "Joint shear strength of exterior beam-column joints reinforced with non-metallic reinforcements". International Journal of Structural Engineering 3, nr 3 (2012): 137. http://dx.doi.org/10.1504/ijstructe.2012.047708.

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Muster, Dominique, Makram Hage-Ali, Kyong-Tschong Rie, Thomas Stucky, Alain Cornet i Didier Mainard. "Plasma Deposition, Plasma Coating, and Ion Implantation to Improve Metallic Implants and Prostheses". MRS Bulletin 25, nr 1 (styczeń 2000): 25–32. http://dx.doi.org/10.1557/s0883769400064988.

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In spite of the success of surgical implants such as artificial hip joints, the materials used to make them are not always quite up to the job. Even stainless steel and titanium alloys can break under the enormous stress on load-bearing joints and corrode in the salty environment of the body. Deposits of inorganic salts can scratch weight-bearing surfaces, making artificial joints stiff and awkward. As a result, the lifetime of an implant is, at most, 10–15 years.Metallurgists and engineers often treat the surfaces of metal parts to improve their properties. The use of advanced surface-treatment techniques such as glow-discharge ion implantation, plasma deposition, and plasma coating can significantly improve the strength, hardness, and corrosion resistance of metal implants. At the same time, these methods should also improve the biocompati-bility of the implanted devices.Cobalt-based alloys are widely used for joint replacements. However, other compounds, such as titanium alloys, have excellent potential biocompatibility and interesting but imperfect mechanical properties. Stainless steel, namely 316L, has a good price-to-mechanical-properties ratio, but has the lowest corrosion resistance of the most commonly used metallic biomaterials.

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Han, Jun, i Hong Yuan. "Full Debonding Process of Adhesively Bonded Composite and Metallic Pipe Joints under Torsion". Mathematical Problems in Engineering 2016 (2016): 1–13. http://dx.doi.org/10.1155/2016/1237493.

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Bonded joints are very common in many pipeline systems, in which the bond behavior of the joint interface is of crucial importance. This paper presents two analytical solutions for the debonding process of a pipe joint under torsion, assuming that the bond interface follows either an exponential softening bond-slip law or a simplified bilinear model. The solutions are general, applicable to composites and metallic and indeed other pipes. Based on the analytical solutions, the influences of the bond length and stiffness on the torque-displacement curve and ultimate load are investigated. The solutions can be used to explain the stress transfer mechanism, the interface crack propagation, and the ductility of the joint.

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Müller, M., R. Chotěborský i J. Krmela. "Technological and constructional aspects affecting bonded joints". Research in Agricultural Engineering 53, No. 2 (7.01.2008): 67–74. http://dx.doi.org/10.17221/2120-rae.

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Adhesive bonding is one of many materials connecting methods. In the last ten years periods the bonding technology noted a boom almost in all industrial branches. The use of bonding technology in the engineering and repairing industry brings considerable savings. Saving in costs, in critical metallic materials and in time are reached and the decrease of the joint weight, too. Therefore the bonding technology pertains to the modern jointing methods even though it is a very old technique. The adhesive bonding technology is influenced by a number of factors which affect the adhesive bond strength. Correcting coefficients have to be considered in construction calculations too. The correcting coefficients correct the strength deviations caused by particular factors. In the paper there are published laboratory experiments results.

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Moeini, S. Ali, Hannes Greve i F. Patrick McCluskey. "Strength and Reliability of High Temperature Transient Liquid Phase Sintered Joints". Additional Conferences (Device Packaging, HiTEC, HiTEN, and CICMT) 2014, HITEC (1.01.2014): 000355–63. http://dx.doi.org/10.4071/hitec-tha25.

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Low-temperature transient liquid phase sintering (LT-TLPS) can be used to form high-temperature joints between metallic interfaces at low process temperatures. In this paper, we will describe the processing and shear strength, along with the shock fatigue resistance of sintered joints made by this process. Joints made from different ratios of Ni and Cu high melting temperature constituents paired with Sn-based low melting temperature constituents have been evaluated. For the shear studies, the softening behavior of test samples joined by Ni-Sn3.5Ag and (Ni,Cu)-Sn3.5Ag sinter pastes have been assessed using a fixture designed for high temperature shear testing up to 600°C. The reliability of sinter paste joints in drop-shock environments will be discussed. It is shown that joints formed from these sinter pastes possess improved drop-shock reliability compared to Sn3.5Ag solder joints and melting temperatures considerably higher than those of conventional high temperature solders (e.g. Pb5.0Sn2.5Ag).

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Tereshchenko, Tetyana. "THE METHODS OF NON-DESTRUCTIVE TESTING OF POSITIONING OF METALLIC DOWEL BARS IN JOINTS OF RIGID PAVEMENTS". Dorogi i mosti 2021, nr 24 (1.10.2021): 72–83. http://dx.doi.org/10.36100/dorogimosti2021.24.072.

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Introduction. In the world-wide practice on construction of rigid road pavements significant attention has been given to jointed plain concrete pavements (JPCP) with transverse joints strengthened by dowel bars. Performance of JPCP is sufficiently affected by right alignment and location of dowel bars thereby the methods of non-destructive testing of dowel bar positioning have been gain in great importance. This paper represents analytical review of methods of non-destructive testing of dowel bar alignment and location emphasizing an attention on standard method using magnetic pulse induction which is applicable to testing of metallic bar position in concrete pavements. General Part. In the general part of this paper, several main aspects of reviewed test method were analyzed: the classification of dowel bars misalignment and their impact on pavement performance; the comparison of implemented methods of non-destructive testing of dowel bar positioning; possibilities of method of magnetic impulse induction and an approach to analytical evaluation of transverse joints dowel bar misalignment using magnetic image tomography; the usage of results of testing of transverse joints dowel bar position to eliminate dowel bars misalignment; examples of predictive estimation of results of testing of transverse joints dowel bar position and their impact on performance of JPCP. The reviewed method of testing and test results estimation concerns practice on application of two levels of performance (e.g. acceptable level and rejectable level) to evaluate the performance of each individual dowel bar or each doweled transverse joint and also a section of rigid road pavement with several consecutive transverse joints with restricted performance. Conclusions. 1. World-wide implemented standard method of non-destructive testing of dowel bar alignment and location allows to detect and to eliminate dowel bars misalignment thus ensuring required load transfer efficiency and international roughness index of rigid road pavements. The estimation of road pavement sections with several consecutive joints considering each joint performance allows to ensure the designed service life of road pavement. 2. Standard method of non-destructive testing of dowel bar alignment and location for transverse joints of rigid road pavement using magnetic pulse induction developed by American Society for Testing and Materials assures high precision of measurement of metallic bar position in doweled bar of concrete pavement joints and enables to detect five types of dowel bar misalignment. 3. In connection with the intensification of issues on construction of rigid road pavements in Ukraine as well as the high importance of the considering test method, an important task should be the development and implementation of an appropriate national standard.

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Ahn, Byungmin. "Recent Advances in Brazing Fillers for Joining of Dissimilar Materials". Metals 11, nr 7 (29.06.2021): 1037. http://dx.doi.org/10.3390/met11071037.

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Brazing fillers for joining applications are essential for manufacturing and designing advanced materials. Several types of brazing fillers have been developed in recent decades to join similar or different engineering materials. Important parts of automotive and aircraft components, including steel, are often joined by brazing. In addition, ceramic components in microwave devices and circuits have been joined with a high level of integration in microelectronic devices. Similarly, in the medical field, metallic implants have been brazed to ceramic dental crowns. These advances have made human life more convenient. However, in brazing, there are certain issues with intermetallic compound (IMC) formation and residual stresses in joints at high temperatures. Nanoparticle-reinforced fillers have been proposed to control IMCs, but there are other dispersion and particle segregation issues at the joints. In this study, various types of brazing fillers, joint fabrication processes, and brazing technologies developed in recent decades are reviewed. Furthermore, new developments in brazing materials and their specific applications are presented. Finally, the emerging areas in brazing, including the recent entropy-modified brazing fillers for various structural and technological fields, are discussed.

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Bonaventur, Alix, Danièle Ayrault, Guillaume Montay i Vincent Klosek. "Evaluation of Residual Stresses in Dissimilar Weld Joints". Materials Science Forum 681 (marzec 2011): 182–87. http://dx.doi.org/10.4028/www.scientific.net/msf.681.182.

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Dissimilar metal joints between pipes of ferritic and austenitic steels are present in primary coolant circuit of pressurized water reactors. Over the last years in particular in USA and Japan, stress corrosion cracks, often associated with weld repairs, have been observed for some dissimilar welds made with an Inconel filler metal. The integrity of this type of components is thus a major safety issue. In this context, the goal of this work is to evaluate the welding residual stresses field for a dissimilar weld joint. A representative bi-metallic tubular weld joint was fabricated and residual stresses profiles in the different weld zones were evaluated by means of the hole drilling and neutron diffraction methods.

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Kovalev, S. P., Pilar Miranzo i María Isabel Osendi. "Stress Distribution in Silicon Nitrice Joints with Metallic Interlayers". Key Engineering Materials 132-136 (kwiecień 1997): 706–9. http://dx.doi.org/10.4028/www.scientific.net/kem.132-136.706.

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Queiroz, Rodrigo A., Eduardo M. Sampaio, Vitor J. Cortines i Ney RF Rohem. "Study on the creep behavior of bonded metallic joints". Applied Adhesion Science 2, nr 1 (2014): 8. http://dx.doi.org/10.1186/2196-4351-2-8.

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Turaga, U. V. R. S., i C. T. Sun. "Improved Design for Metallic and Composite Single-Lap Joints". Journal of Aircraft 45, nr 2 (marzec 2008): 440–47. http://dx.doi.org/10.2514/1.28934.

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Camanho, P. P., i F. L. Matthews. "Bonded metallic inserts for bolted joints in composite laminates". Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications 214, nr 1 (styczeń 2000): 33–40. http://dx.doi.org/10.1177/146442070021400105.

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Shiri, S. Gholami, A. Sarani, S. R. Elmi Hosseini i G. Roudini. "Diffusion in FSW Joints by Inserting the Metallic Foils". Journal of Materials Science & Technology 29, nr 11 (listopad 2013): 1091–95. http://dx.doi.org/10.1016/j.jmst.2013.07.003.

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Morishita, M., N. Ikahata i S. Kitamura. "Simplified Dynamic Analysis Methods for Metallic Bellows Expansion Joints". Journal of Pressure Vessel Technology 113, nr 4 (1.11.1991): 504–10. http://dx.doi.org/10.1115/1.2928787.

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An investigation into dynamic characteristics and seismic response of bellows expansion joints is described. For axial and lateral vibrations of the bellows, simplified methods are developed to evaluate their natural frequencies and seismic response, based on analogies with those of a uniform rod and a Timoshenko beam, respectively. For the lateral vibration modes, effect of fluid-structure interaction between the convolutions and flow-sleeve is taken into account. The validity and applicability of the simplified methods are shown, by comparing with the results of vibration experiments using a simple bellows model and a piping model with bellows, along with corresponding detailed FEM analyses’ results.

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Ramezani, Farin, Beatriz D. Simões, Ricardo J. C. Carbas, Eduardo A. S. Marques i Lucas F. M. da Silva. "Developments in Laminate Modification of Adhesively Bonded Composite Joints". Materials 16, nr 2 (6.01.2023): 568. http://dx.doi.org/10.3390/ma16020568.

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The use of carbon fibre reinforced polymer (CFRP) materials is increasing in many different industries, such as those operating in the aviation, marine, and automotive sectors. In these applications, composite parts are often joined with other composite or metallic parts, where adhesive bonding plays a key role. Unlike conventional joining methods, adhesive bonding does not add weight or require the drilling of holes, both of which are major sources of stress concentration. The performance of a composite joint is dependent on multiple factors and can be improved by modifying the adhesive layer or the composite layup of the adherend. Moreover, joint geometry, surface preparation, and the manufacturing methods used for production are also important factors. The present work reviews recent developments on the design and manufacture of adhesively bonded joints with composite substrates, with particular interest in adherend modification techniques. The effects of stacking sequence, use of thin-plies, composite metal laminates and its specific surface preparations, and the use of toughened surface layers in the composite adherends are described for adhesively bonded CFRP structures.

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Lindner, Thomas, Erik Saborowski, Mario Scholze, Benjamin Zillmann i Thomas Lampke. "Thermal Spray Coatings as an Adhesion Promoter in Metal/FRP Joints". Metals 8, nr 10 (27.09.2018): 769. http://dx.doi.org/10.3390/met8100769.

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In this study, various structuring methods for creating adhesion by mechanical interlocking in the interface of metal/FRP (fiber-reinforced polymer) joints are investigated. A novel processing route using thermal spray coatings as additive structure is presented. Different coating systems are first assessed by axial loading tests with spray-coated plungers for the evaluation of the additive layer adhesion on the metallic base material. Additional microstructures, produced by different abrasive processes (corundum blasting, laser structuring, and fine milling) are compared with the additive structures. All surface structures are characterized by electron microscopy for two sheet materials: DC06 and AA6016-T4. The abrasive structures show a significant material dependence, while the selected coating system offers the adjustment to different base materials by an independent surface layer. The structured metal sheets were further joined to glass-fiber-reinforced polyamide 6 (PA6) by hot pressing to evaluate the interface properties in tensile shear tests. The results confirm a suitability of thermal spray coatings for providing a high bonding strength in metal/FRP joints for both investigated metallic substrate materials.

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