The Experts below are selected from a list of 2121 Experts worldwide ranked by ideXlab platform
Xiao Ling Zhao - One of the best experts on this subject based on the ideXlab platform.
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Tests on CFRP Strengthened Aluminium RHS Subject to End Bearing Force
Advances in FRP Composites in Civil Engineering, 2020Co-Authors: Xiao Ling Zhao, Phaon PhiphatAbstract:Web crippling of thin-walled members is often observed at loading or reaction points where concentrated Forces exist. This paper reports an investigation on using CFRP (carbon fiber reinForced polymer) strengthening technique to improve the web crippling capacity of aluminium RHS (rectangular hollow section). Several types of strengthening technique were adopted in this project. They include applying CFRP plates outside or/and inside the RHS. A series of laboratory tests were conducted. Significant increase in load carrying capacity was obtained. The test results are also compared with those for cold-formed steel RHS strengthened by CFRP.
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behaviour of circular concrete filled double skin tubes subjected to local Bearing Force
Thin-walled Structures, 2015Co-Authors: Xiao Ling ZhaoAbstract:Abstract This paper presents the behaviour of circular concrete filled double skin tubes (CFDST) subjected to local Bearing Forces. This is an extension of a previous work on concrete filled steel tubes (CFST). A series of tests were conducted where some key parameters were varied, including loading angle, hollow ratio, chord wall thickness, as well as brace to chord diameter ratio. A finite element analysis (FEA) modelling was established and verified by the test data. Comparative analysis was conducted between the full-range behaviour of CFDST and CFST under local Bearing. It was found that the performance of CFDST is considerably affected by the interaction of the outer tube, inner tube and the sandwiched concrete, whilst its Bearing capacity depends on the hollow ratio. Finally, based on the load-transfer mechanism analysis, simplified formulae for predicting the strength of CFDST under local Bearing Forces are presented. Reasonable agreement between the predicted and measured values is achieved.
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concrete filled circular steel tubes subjected to local Bearing Force experiments
Journal of Constructional Steel Research, 2013Co-Authors: Xiao Ling ZhaoAbstract:Abstract Concrete filled steel tubular (CFST) members are subjected to local Bearing Forces in a large number of truss and lattice structures. Previous research has focused on rectangular CFST members under such loading condition. There is a lack of understanding on circular CFST members subjected to local Bearing Force. This paper intends to fill the knowledge gap in this area. A series of tests were conducted on circular CFST, unfilled circular hollow section (CHS) steel tube and plain concrete specimens loaded with local Bearing Force. The load was applied either perpendicularly to the member or at an angle of 45°. A deformation limit was adopted to define the ultimate strength of the specimen since the load verse deformation curve exhibits a ductile behavior. The effects of important parameters were investigated based on the test results. Finally, design formulae were developed to predict the ultimate strength of circular CFST members under local Bearing Forces.
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cfrp strengthened rhs subjected to transverse end Bearing Force
Engineering Structures, 2006Co-Authors: Xiao Ling Zhao, Dilum Fernando, Riadh AlmahaidiAbstract:This paper reports the improved web crippling behaviour of RHS (rectangular hollow section) strengthened by CFRP (Carbon Fibre ReinForced Polymer). Several types of strengthening were adopted, such as wrapping CFRP sheeting outside the RHS or applying CFRP plates outside or/and inside the RHS. It was found that the CFRP strengthening significantly increases the web crippling capacity especially for those with large web depth-to-thickness ratio. Design models are proposed to predict the increased capacity for CFRP strengthened RHS subjected to transverse end Bearing Force.
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partially stiffened rhs sections under transverse Bearing Force
Thin-walled Structures, 1999Co-Authors: Xiao Ling ZhaoAbstract:Concentrated Force applied to rectangular hollow sections (RHS) members at loading or reaction points can lead to web crippling of the members. This paper investigates the possibility of improving the web crippling behaviour of RHS sections using internal stiffeners. Tests of RHS sections partially filled with concrete and with wood plus a bolt through the web are described. Both end-Bearing and interior-Bearing Forces were applied. Design models are established for the four failure modes identified in the tests. The parameters varied include section aspect ratio (D/B) which ranges from 1.5 to 3.0, web depth to thickness ratio (D/t) which ranges from 15 to 75, and Bearing length to section width ratio (γ=N/B) which ranges from 0.5 to 1.0.
Gregory J Hancock - One of the best experts on this subject based on the ideXlab platform.
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square and rectangular hollow sections under transverse end Bearing Force
Journal of Structural Engineering-asce, 1995Co-Authors: Xiao Ling Zhao, Gregory J HancockAbstract:This paper describes tests on a range of cold-formed square and rectangular hollow section members subject of end-Bearing Force. The concentrated Force was applied by means of a Bearing plate, which acted across the full flange width of the section. The parameters varied in the tests included (1) the Bearing length; (2) the slenderness of the member; and (3) the shape of the section [rectangular hollow sections (RHS) or square hollow sections (SHS)]. The results are compared with existing American Australian, Canadian, and European design formulas. The results are also compared with the formulas given by the writers, which were based on tests of SHS and RHS sections under interior Bearing Force. A design model is proposed for SHS and RHS sections under end-Bearing Force. The reliability analysis method is used to calibrate the existing and proposed design formulas.
Jay F. Tu - One of the best experts on this subject based on the ideXlab platform.
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Bearing Force Monitoring in a Three-Shift Production Environment
Tribology Transactions, 1996Co-Authors: Jay F. Tu, James G. KatterAbstract:Premature failure of machine tool spindle Bearings is a major problem in production that can result in enormous loss in production and spindle rehabilitation cost. The Bearing internal contact Force tends to change when the spindle is subjected to abnormal operating conditions. In this paper, the complicated variations in the condition of a grinding spindle in a three-shift production line were studied with a focus on examining the relative magnitudes of the main components of the race/roller contact Force, e.g., the Bearing initial preload, thermally induced preload, and grinding load, over an extended period of time. The results show that, a stable operating condition was achieved and that the dominant contact Force component is the thermal preload. Significant preload variations were observed between shifts when the spindle was restarted. Excessive thermal preload which grew to a value of more than nine limes of the initial preload was also observed. Consequently, excessive preload is likely to be the ...
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Strain field analysis and sensor design for monitoring machine tool spindle Bearing Force
International Journal of Machine Tools and Manufacture, 1996Co-Authors: Jay F. TuAbstract:The fluctuating strain field produced by the rolling motion of the spindle Bearing is analyzed by an elastic model and verified with experimental data. This strain field analysis is of considerable practical significance because of its close correlation to spindle Bearing preload, cutting Forces, and Bearing running conditions. Based on the model, a conventional sensing scheme with strain gages mounted in a groove ground around the Bearing outer ring is optimized by selecting proper sensor sizes, locations, and configurations such that signal cross-over error is minimized. In addition, the feasibility of a non-invasive sensing scheme achieved by attaching high sensitivity sensors on the outside surface of the spindle housing is studied. From the strain model, it is found that the level of strain field at the housing surface is substantially lower, and its distribution is not concentrated. Therefore, high sensitivity sensors and different sensing schemes are needed. Simulation results show that, compared with the conventional scheme, the output of this scheme requires less signal processing when the Force acting on the Bearing is fluctuating.
Kojiro Iizuka - One of the best experts on this subject based on the ideXlab platform.
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AIM - Study on Bearing performance for inching worm locomotion using characteristics of wheel subsidence on loose soil
2018 IEEE ASME International Conference on Advanced Intelligent Mechatronics (AIM), 2018Co-Authors: Daisuke Fujiwara, Kojiro IizukaAbstract:In general, slipping and sinking on the rough terrain is lead to poor condition for planetary explorations robot, which is equipped with a cylindrical typed wheel. Meanwhile, in a robot, which is equipped with inching worm locomotion, slipping and sinking lead to increase a traveling performance because the more sinking and slipping of the robot is, the larger the Bearing Force in the back of a wheel increases. Moreover, in the inching locomotion, the wheel travels during sharing soil beneath the wheel and pushing soil in backward. However, this model was not investigated before. This paper investigates the relationship between the Bearing Force in the back of the wheel and sinkage. For analysis, firstly, this paper performs theoretical consideration and numerical simulation of a Bearing Force using bulldozing resistance model. Secondly, this paper performs wheel bulldozing experiment. In order to investigate the difference of Bearing Force when the wheel size is changed, this paper sets three wheel size. From the simulation and experimental results, the Hegedus's model corresponds with the experimental results in each wheel size. Additionally, the Bearing Force was observed to increase when the sinkage was increased. Thus, the ability of the inching locomotion using deep sinkage is high.
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Study on Bearing performance for inching worm locomotion using characteristics of wheel subsidence on loose soil
2018 IEEE ASME International Conference on Advanced Intelligent Mechatronics (AIM), 2018Co-Authors: Daisuke Fujiwara, Kojiro IizukaAbstract:In general, slipping and sinking on the rough terrain is lead to poor condition for planetary explorations robot, which is equipped with a cylindrical typed wheel. Meanwhile, in a robot, which is equipped with inching worm locomotion, slipping and sinking lead to increase a traveling performance because the more sinking and slipping of the robot is, the larger the Bearing Force in the back of a wheel increases. Moreover, in the inching locomotion, the wheel travels during sharing soil beneath the wheel and pushing soil in backward. However, this model was not investigated before. This paper investigates the relationship between the Bearing Force in the back of the wheel and sinkage. For analysis, firstly, this paper performs theoretical consideration and numerical simulation of a Bearing Force using bulldozing resistance model. Secondly, this paper performs wheel bulldozing experiment. In order to investigate the difference of Bearing Force when the wheel size is changed, this paper sets three wheel size. From the simulation and experimental results, the Hegedus's model corresponds with the experimental results in each wheel size. Additionally, the Bearing Force was observed to increase when the sinkage was increased. Thus, the ability of the inching locomotion using deep sinkage is high.
A Andersson - One of the best experts on this subject based on the ideXlab platform.
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A method to determine dynamic loads on spur gear teeth and on Bearings
Journal of Sound and Vibration, 2003Co-Authors: L. Vedmar, A AnderssonAbstract:A method is described which can be used to calculate dynamic gear tooth Force and Bearing Forces. The model includes elastic Bearings. The gear mesh stiffness and the path of contact are determined using the deformations of the gears and the Bearings. This gives contact outside the plane-of-action and a time-varying working pressure angle. In a numerical example it is found that the only important vibration mode for the gear contact is the one where the gear tooth deformation is dominant. The Bearing Force variation, however, will be much more affected by the other vibration modes. The influence of the friction Force is also studied. The friction has no dynamic influence on the gear contact Force or on the Bearing Force in the gear mesh line-of-action direction. On the other hand, the changing of sliding directions in the pitch point is a source for critical oscillations of the Bearings in the gear tooth frictional direction. These Bearing Force oscillations in the frictional direction appear unaffected by the dynamic response along the gear mesh line-of-action direction.
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A method to determine dynamic loads on spur gear teeth and on Bearings
Journal of Sound and Vibration, 2003Co-Authors: L. Vedmar, A AnderssonAbstract:A method is described which can be used to calculate dynamic gear tooth Force and Bearing Forces. The model includes elastic Bearings. The gear mesh stiffness and the path of contact are determined using the deformations of the gears and the Bearings. This gives contact outside the plane-of-action and a time-varying working pressure angle. In a numerical example it is found that the only important vibration mode for the gear contact is the one where the gear tooth deformation is dominant. The Bearing Force variation, however, will be much more affected by the other vibration modes. The influence of the friction Force is also studied. The friction has no dynamic influence on the gear contact Force or on the Bearing Force in the gear mesh line-of-action direction. On the other hand, the changing of sliding directions in the pitch point is a source for critical oscillations of the Bearings in the gear tooth frictional direction. These Bearing Force oscillations in the frictional direction appear unaffected by the dynamic response along the gear mesh line-of-action direction. © 2003 Elsevier Ltd. All rights reserved.
