Papers by Keyword: Joint

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Authors: Simon Hehl, Till Vallée, Thomas Tannert, Yu Bai
Abstract: Joining timber structural elements using mechanical fasteners goes against the anisotropic and fibrous nature of the material. Adhesive bonding is by far better adapted, since it permits a smoother load transfer. However, the strength prediction of adhesively bonded wooden joints is difficult brittle nature of the adherends, the complex stress distribution as well as the uncertainties regarding the associated material resistance. As a contribution to help close this research gap, the authors have carried out experimental and analytical investigations on adhesively bonded double lap joints composed of timber. This paper describes the experimental and numerical results and suggests a probabilistic method for the strength prediction of joints composed of brittle adherends and adhesives. The method considers the scale sensitivity of material strength modelled using a Weibull statistical function, and considers both the statistical variation and the size effect in the strength of the material. The probabilistic method presents a mechanical explanation for the increased resistance of local zones subjected to high strain or stress peaks.
Authors: Petr Fajman
Abstract: This Traditional joints used for the restoration of historical timber structures are not designed according to standards. A very common joint is a vertical splice skew with a key. Unfortunately, the forces mutually acting in its separated parts are not known. It is only their limits that may be derived with some accuracy, but even this is very valuable for practice. The accurate values may be obtained from measurements or experiments.
Authors: In Kyu Kwon
Abstract: Building construction has been developed with an increase of steel application at main members, but the weakness should be resolved with a proper fire resistance. The fire engineering method is regarded as an alternative way to evaluate the fire resistance with mechanical and thermal properties at high temperature. In this paper, the fire resistance of H-section built with ordinary grade structural steels such as SS 400 and SM 490 those are representative structural steels at the construction market were analyzed by the difference of boundary conditions. The study showed that the H-section made of SM 490 represented little difference in reduction ratio of an allowable stress at one hour standard fire curve. And the hinge to hinge boundary condition from both H-sections was the lowest. As the grade of structural steel rises, the difference in an allowable stress at high temperature according to grade of structural steels is inclined to increase.
Authors: Jian Hua Wang, Hang Zhang, Yong Sheng Zhao, Xiao Lei Song
Abstract: This paper introduces the development of a tool for modeling and analysis of BTF toolholder-spindle system, based on ANSYS software. The tool is developed in parametric design method. Most parameters are defined automatically except a few parameters requiring users to input, which improves the modeling efficiency greatly. The interface joint of the BTF toolholder-spindle is established by adopting spring-damping model and defined by custom element unit Matrix27. The proposed model reflects the characters of the joint on the properties of BTF toolholder-spindle effectively. A case study is given to verify the efficiency and accuracy of the developed tool.
Authors: Florentin Buium, Dumitru Leohchi, Ioan Doroftei
Abstract: The paper deals with a workspace problem of the 3 RRR planar parallel mechanism, used as parallel robot structure. Depending on the dimensional parameters and constructive characteristics, the authors search to depict the shape and particularities of the mechanism workspace of a 3 RRR planar parallel mechanism. This characterization of the mechanism workspace depending on the dimensional parameters can be usefull in mechanism designing accorded to some functional particularities and also can help in avoiding singular configurations.
Authors: F. Papadopoulos, D. Aiyappa, R. Shapriya, E. Sotirchos, H. Ghasemnejad, R. Benhadj-Djilali
Abstract: In this paper the failure behaviour of natural stitched composite materials in the skin-stiffener of wind turbine blade structures are investigated. For this study, the laminated composite beams were stitched using Flax yarns before curing process. Two stiffener structures of T-beam and Box-beam are studied in this paper. These specimens were tested under quasi-static loading condition to compare the failure resistance of adhesive and stitched bonding methods. Furthermore, the cohesive zone modelling (CZM) which is known as a variation in the cohesive stresses with the interfacial opening displacement along the localised fracture process zone is used to predict bonding failure in the skin-stiffener of wind turbine blade structures.
Authors: Nan Zhe Wei, Han Xu Sun, Qing Xuan Jia, Ping Ye
Abstract: Space robotic systems are expected to play an increasingly important role in future space activities. With continuous growth of demands of control precision and robustness, researches of complex dynamic characteristics for robot joints become the key problem for space manipulators design. In this paper, the main research achievements on dynamics modeling for joints with harmonic drives are reviewed, and future studies are recommended. Firstly, we summarize the application status of joints with harmonic drives in space robotic systems. Secondly, dynamic characteristics of joint in space environment are discussed. Then, the advances in joint modeling, including compliance, transmission friction and hysteresis, are introduced. Moreover, identification methods and relevant research works are reviewed. Finally, the future research trends are forecasted.
Authors: M.P. Zanni-Deffarges, Martin E.R. Shanahan
Authors: Li Chang Wang, Guo Zhi Qiu
Abstract: This paper presents the concepts used for the structural analysis and design of Dalian International Conference Center. The unique building consists of various conference and function rooms. A steel deck of 25,000 m2 is supported by 14 transportation tubes and surrounded by 7 cantilevered conference and function rooms, an isolated opera house with 1800 seats is at the center. Some typical joints are also introduced in the paper.
Authors: Xiao Wen Li, Ping Li, Zhuang Lin, Dong Mei Yang
Abstract: Composite to metal joints as important components of marine structures are gradually found in the marine industry. The purpose of this study is to investigate mechanical performance and optimization method of the composite sandwich to steel joints. The main emphasis was placed on the mechanical properties of a hybrid joint between a sandwich glass fibre reinforced plastic superstructure and a steel main hull. Based on the experiments of a base joint, a new finite element method was used to analyze a series of joints. The optimized joint was presented due to reducing weight and enhancing the mechanical performance. The numerical predictions of the base hybrid joint showed a very good correlation with the experiment results, which validated the reliability of the new finite element method. The strength of the optimized joint was also evaluated by finite element method. The result is similar to the base joint. And there is no additional stress concentration in weak parts. The optimized joint has 30% lower weight than the base joint, and the stress is only about 5% ~ 56% of the base one. The results of the present work imply that the change of geometric parameter is an effective method to improve the performance of the metal to composite joint.
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