Papers by Keyword: Joint

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Authors: Masatoshi Mori, Nguyen Loc The, Goroh Itoh, Nobuhide Itoh, Yasuhiro Shimada
Abstract: In automobiles, a suspension bush, a set of aluminum parts connected to each other via rubber, is mounted into the suspension members to link the body to the wheels, and realizes hard and soft mounts contributing both to the stabilization during high speed driving and to absorbing the shock from the road. However, decohesion of the aluminum part from the rubber occurs occasionally, arising from the interface corrosion of aluminum, which deteriorates the performance of the vehicle directly. In this study, effects of alloy composition and processing route on this kind of corrosion will be investigated. Also, development of a new corrosion test that shortens the time for the test will be attempted.
Authors: Kaori Fujita, Eunmi Shin, Akito Ibaraki, Masashi Sanuki
Abstract: This paper introduces the recent attempts to clarify the seismic behavior of traditional timber architecture. The subject of the research is a timber temple, Kencho-ji, in Japan, designated as important cultural property. The temple was affected by the Great Kanto Earthquake 1923. There are two main halls in the Kencho-ji temple, and one of them collapsed while the other slightly inclined. The two main halls have similar structures, and stand next to each other. The authors have been trying to clarify the reason for the difference in the damage for the past ten years through on-sight measurement, micro tremor test, earthquake monitoring and structural analysis. As there is very few information concerning the hidden detail of the joints, recently the authors have operated X-ray inspection. The paper introduces the result of the X-ray test and the structural analysis using the result of the newly revealed hidden joint is discussed.
Authors: Stephan Ucsnik, Rudolf Gradinger, Almedin Becirovic, Andreas Waldhör
Abstract: At present, enhancement of hybrid metal joints for tensile pull-out load through overlap surfaces with a macro-scale roughness is one scope of research. The macro-scale roughness is established through the modified arc-welding process, called “cold metal transfer pin” (CMT-pin), which enables repetitive manufacturing of arrays of metal reinforcements (pins) on parent metal surfaces.Hybrid metal joints between parent steel sleeves and cast aluminium alloy have been investigated. Joint surfaces of parent steel sleeves, which have cylindrical cross-sections, are modified by cylinder and ballhead pins. Cast metal joints were tested under uniaxial tensile loading. At the same time, their load transfer behaviour was determined. Results of tensile tests of hybrid metal joints with different kinds of pins, as well as with different amounts of pins are presented. Comparisons with reference joints without pins or with steel sleeves containing a harmonious triangular polygon cross-section ("P3G") and endings with an enlarged diameter are carried out.The results show an enhanced load transfer performance in the case of hybrid metal joints with pins, as well as enhanced performance measures compared to reference joints. It is also shown that the pin quantity has a major impact on the ultimate joint strength and the irreversible energy absorption density. The use of a certain quantity of pins leads to a change of the failure shape of the joints, which includes steel sleeve pull-out and pin shear to rupture of the cast aluminium.
Authors: Feng Shan Ma, Hai Jun Zhao, Jie Guo
Abstract: In this paper, a practical technical approach for the evaluation of hydraulic conductivity in complex fractured rock mass is present in a seabed gold mine. According to hydrogeological conditions and characteristics survey in the field, geometry measuring method was applied in the in-situ investigation. Moreover, various methods were involved in the evaluation of the fracture development, water seepage features and permeability of the fractured rock mass. Through this study, a particular set of hydrogeological investigation, research and permeability evaluation methods were put forward, which are of great significance to the research and practical production of mines with similar cases.
Authors: Ebrahim Safa, Arman Safa, Abolfazl Hasani, Ali Mansourkhaki
Abstract: In the rigid pavement ,seams of joints has been used to prevent damage caused by expansion and contraction of the slab Changes in temperature differences and slab movement. On the other hand always rigid pavement cracks starting and totally starting the failure of the concrete slab are in this region that it has many different causes. In the Place of joints side uses the dowel bar for evidence performance that transfer the forces between slabs to control expansion and contraction changes in slabs. Destruction and deviation in the concrete slab joints side , the high cost of repairing and replacement of dowel bars and the cost of repairing the cracks and the failure of slabs are the reason for re-modeling, analysis and optimization of joints and dowel bar types. In This project, we try to define the role and influence of the shape of dowel bars and optimize the performance of joints in the rigid pavement.
Authors: S.J.I. Walker, G.S. Aglietti, P.R. Cunningham
Abstract: In the current world of engineering, structural vibration problems continue impact the design and construction of a wide range of products. Amid the parameters that determine the dynamic behaviour of a structure the one that takes into account the dissipation of energy resulting in the decay of the vibration is the least understood and the most difficult to quantify [1]. The estimation of damping factors is of interest in most branches of engineering sciences. In the field of aircraft structures the damping directly affects the fatigue life, a parameter which is applied conservatively due to the inherent complexity in modelling the damping of built up structures and the potentially catastrophic consequences of a fatigue failure. One of the most important problems is the limited knowledge of how joints affect the damping of the complete structure. This work therefore addresses this issue and focuses on the damping of joints in metal plates as part of a larger project to investigate the damping of built up structures. Various plate configurations are experimentally investigated using two different approaches. The results from the configurations are compared and discussed along with the advantages and disadvantages of each experimental approach. This enables a link to be identified between the damping magnitudes and the mode shapes and joint stiffnesses.
Authors: Hong Lin Zhao, Dian Xin Li, Yu Mei Huang, Feng Gao, Jia Yu, Bo Wang, Dong Hui Mu
Abstract: Contact heat transfer are widely used in mechanical system and research on thermal contact resistance is a significant link in engineering application. In this article, main influencing factors of thermal contact resistance such as material characteristics, contact pressure, surface roughness, intermediate medium had been further researched by experimental methods, and the relations between pressure and thermal contact resistance had been taken under different materials, different suface processing quality and different medium. Several other problems related to thermal contact resistance had also been discussed. The research contents provide reference for the application of thermal contact resistance and reasonable design of mechanical structure.
Authors: Nan Li, Ya Jun Xi
Abstract: A new type of joint between Concrete-filled Square Steel Tube columns and steel beam is proposed in this paper, and the seismic behavior of this type of joint under low-reversed cyclic loading experiment is researched. Ductility behavior, dissipation of seismic energy of this joint under horizontal, repeat load are analyzed. The experimental results showed that all specimens have good ductility and energy dissipation capacity. The story angle drift ductility ratios are μ=3.23~3.63, and the equivalent viscous damping coefficients are he=0.25~0.35,which meet the needs of the code for seismic design of building.
Authors: Dong Hua Zhang, Xiao Hong Zhou, Long Wei Zhou
Abstract: An experimental study of tensile failure behaviors of L-shaped adhesive-bonded and bolted hybrid composite joints, which are designed to connect composite cabins, is performed. A set of rigid jigs was designed to fix the specimens and ensure to apply an axial tensile load. The damage processes, failure loads and ultimate failure patterns of the joints are obtained from the tests. Some indentation around the fastener hole and remarkable discontinuity departure between the top and bottom L-shaped laminates which leads to the catastrophic failure can be observed on the specimens. It follows that the discontinuity is the weak spot and required to be strengthened.
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