Numerical Analysis of the Influence of Bolt Pretension on Rigid Flange Joint Rigidity in Substation Steel Structures

2013 ◽  
Vol 405-408 ◽  
pp. 3186-3191 ◽  
Author(s):  
Yan Wang ◽  
Zu Tian Cheng ◽  
Yi Liang Peng ◽  
Xin Gu ◽  
Tao Zhang
Keyword(s):  
Finite Element ◽  
Steel Structures ◽  
Element Model ◽  
Experimental Investigations ◽  
Shear Rigidity ◽  
Flange Joint ◽  
Bending Rigidity ◽  
Calculation Results ◽  
Bolt Pretension ◽  
Joint Rigidity

in order to research the influence of bolt pretension on the rigid flange joints stiffness further, ANSYS finite element model was built on the basis of experimental investigations, and was used to research the influence of bolt pretension on the axial rigidity, shear rigidity and bending rigidity. The calculation results indicated that the axial rigidity, shear rigidity and bending rigidity were all increased along with the increase of bolt pretension, and the increase of axial rigidity was most obvious.

Numerical Analysis of the Influence of Bolt Pretension on Flexible Flange Joint Rigidity in Substation Steel Structures

2013 ◽  
Vol 405-408 ◽  
pp. 3192-3197 ◽  
Author(s):  
Jun Shan Song ◽  
Hai Tao Liu ◽  
Chun Hao Du ◽  
Dong Po Hong ◽  
Tao Zhang
Keyword(s):  
Finite Element ◽  
Steel Structures ◽  
Element Model ◽  
Experimental Investigations ◽  
Shear Rigidity ◽  
Flange Joint ◽  
Bending Rigidity ◽  
Calculation Results ◽  
Bolt Pretension ◽  
Joint Rigidity

In order to research the influence of bolt pretension on the flexible flange joints stiffness further, ANSYS finite element model was built on the basis of experimental investigations, and was used to research the influence of bolt pretension on the axial rigidity, shear rigidity and bending rigidity. The calculation results indicated that the axial rigidity, shear rigidity and bending rigidity were all increased along with the increase of bolt pretension, and the increase of axial rigidity was most obvious.

Development of Magnetic Adhesion Based Wheel-Driven Climbing Machine for Ferrous Surface Applications

2018 ◽  
Author(s):  
Ravindra Singh Bisht ◽  
Pushparaj Mani Pathak ◽  
Saroj Kumar Panigrahi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Adhesion Force ◽  
Steel Structures ◽  
Element Model ◽  
Vital Role ◽  
Experimental Investigations ◽  
Climbing Robot ◽  
Ground Station ◽  
The Coefficient Of Friction

This paper presents an autonomous magnetic wheel-driven climbing robot for automatic inspection of above ground steel storage structures, particularly for large even vertical surfaces of above ground tall steel structures. The design, simulation and experimental investigations on a multi-layer permanent magnetic wheel mechanism are discussed. A Finite element model for magneto-static (FEMM) analysis is proposed for an optimal wheel mechanism design. Laboratory experiments have been performed to measure adhesion force generated by the developed magnetic wheel mechanism and compared with simulation results obtained by proposed finite element model. The effect of rubber grip thickness on magnetic wheel for measuring adhesion force is also studied. The coefficient of friction, which plays a vital role for robot locomotion, has been measured experimentally. It should be enough to provide sufficient traction by providing an extra rubber grip added around to the wheel rim. Analysis of forces due to magnetic wheel adhesion mechanism has been made for avoiding climbing robot slipping and toppling while crawling on vertical/incline wall. The wireless communication and control system for prototype climbing robot has been developed using ATMega microcontroller based Arduino boards, motor driver IC, XBee transceiver. The developed autonomous four-wheel differential drive magnetic climbing robot can be controlled remotely from a ground station up to 90 m outdoor line-of-sight working range. The prototype-climbing robot has demonstrated various maneuverability trials on a vertical ferrous surface, and described in this paper.

scholarly journals Finite element analysis for components force of flexural rubber joint

2018 ◽  
Vol 175 ◽  
pp. 03043
Author(s):  
HE Hong ◽  
Li Xiaoqin ◽  
Shenjun Gao
Keyword(s):  
Finite Element ◽  
Maximum Stress ◽  
Element Model ◽  
Element Analysis ◽  
Axial Tension ◽  
Reinforcement Ring ◽  
Calculation Results ◽  
Bolt Pretension ◽  
Fitting In ◽  
The Finite Element Model

Flexible rubber joint is an important connecting pipe fitting in ship and chemical industry. However, the problems existing in its application, especially the stress distribution for each component of rubber joint structure, were lack of theoretical analysis. Therefore the finite element model of rubber joint was established according to its structure in this study. With the help of software, the stress characteristics of rubber joint under the axial tension and periodic dynamic load were analysed with the standard maximum internal pressure load and flanges bolt pretension together. The calculation results showed that the order of maximum stress in rubber joint components from big to small was: reinforcement ring, cord layer and rubber skeleton. In order to reduce the stress value at the weak area in the rubber components, the angles of the cord were studied and found that when the cord angle were 60°/-60°for 1,3,5/2,4,6 layer respectively, the maximum stress value for the reinforcement ring and cord fabrics were reduced obviously. After the life computation by the software, it was confirmed that the cord angle arrangement 60°/-60°for cord layers could significantly improve the service life of the rubber joint.

Topology Optimization Design of High Pressure Storage Tank Structure

2012 ◽  
Vol 430-432 ◽  
pp. 828-833
Author(s):  
Qiu Sheng Ma ◽  
Yi Cai ◽  
Dong Xing Tian
Keyword(s):  
Finite Element ◽  
High Pressure ◽  
Topology Optimization ◽  
Storage Tank ◽  
Optimization Design ◽  
Influence Factors ◽  
Element Model ◽  
Design Variables ◽  
Calculation Results ◽  
Pressure Storage

In this paper, based on ANSYS the topology optimization design for high pressure storage tank was studied by the means of the finite element structural analysis and optimization. the finite element model for optimization design was established. The design variables influence factors and rules on the optimization results are summarized. according to the calculation results the optimal design result for tank is determined considering the manufacturing and processing. The calculation results show that the method is effective in optimization design and provide the basis to further design high pressure tank.

Calculating Mechanics Characteristics of Single-Walled Carbon Nanotube Materials by Finite Element Method

2017 ◽  
Vol 730 ◽  
pp. 548-553
Author(s):  
Jing Ge ◽  
Hao Jiang ◽  
Zhen Yu Sun ◽  
Guo Jun Yu ◽  
Bo Su ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Radial Direction ◽  
Element Model ◽  
Beam Element ◽  
Beam Position ◽  
Single Walled Carbon ◽  
Finite Element Software ◽  
Calculation Results ◽  
The Moment

In this paper, we establish the mechanical property analysis of Single-walled Carbon Nanotubes (SWCNTs) modified beam element model based on the molecular structural mechanics method. Then we study the mechanical properties of their radial direction characteristics using the finite element software Abaqus. The model simulated the different bending stiffness with rectangular section beam elements C-C chemical force field. When the graphene curled into arbitrary chirality of SWCNTs spatial structure, the adjacent beam position will change the moment of inertia of the section of the beam. Compared with the original beam element model and the calculation results, we found that the established model largely reduced the overestimate of the original model of mechanical properties on the radial direction of the SWCNTs. At the same time, compared with other methods available in the literature results and the experimental data, the results can be in good agreement.

Finite Element Simulation Analysis on Space KX-Joint

2014 ◽  
Vol 915-916 ◽  
pp. 146-149
Author(s):  
Yong Sheng Wang ◽  
Li Hua Wu
Keyword(s):  
Finite Element ◽  
Bearing Capacity ◽  
Simulation Analysis ◽  
Local Buckling ◽  
Element Model ◽  
Ansys Software ◽  
Element Simulation ◽  
Calculation Results ◽  
Buckling Failure ◽  
The Finite Element Model

The finite element model of the space KX-Joint was established using ANSYS software, and the failure mode and ultimate bearing capacity of KX-joint were researched. Calculation results show that the surface of chord wall on the roots of compression web members was into the plastic in K plane, and the holding pole without the plastic area and the local buckling failure happened in the surface of chord wall on the roots of Compression Web Members in X plane; The bearing capacity of the joint increased with the Chord diameter, which was appears in the form of power function.

scholarly journals Investigation on aerodynamic characteristics of bionic membrane nano rotor

2021 ◽  
Vol 18 ◽  
pp. 175682932110433
Author(s):  
Shanyong Zhao ◽  
Zhen Liu ◽  
Ke Lu ◽  
Dacheng Su ◽  
Shangjing Wu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Structural Parameters ◽  
Element Model ◽  
Aerodynamic Characteristics ◽  
Aerodynamic Performance ◽  
Dynamics Model ◽  
Interaction Method ◽  
Calculation Results ◽  
The Finite Element Model

In this paper, the bionic membrane structure is introduced to improve the aerodynamic performance of nano rotor at the low Reynolds number. The aerodynamic characteristics of nano rotor made of hyperelastic material as membrane blades are studied. Firstly, based on the hyperelastic constitutive model, a finite element model of the rotor is established and compared with the results of the modal test to verify the accuracy of the model. Then the computational fluid dynamics model of membrane nano rotor is established which combined with the finite element model. The aerodynamic characteristics of the membrane rotor under hovering conditions are studied using fluid–structure interaction method. It is found that the calculation results matched well with the experiment results. The design of the structural parameters such as the membrane proportion, shape, and position of the membrane rotor is optimized. The influence of each parameter on the aerodynamic performance of the rotor is obtained. Under certain structural conditions, the performance can be effectively improved, which provides a new idea for the design of the nano rotor.

Pipeline On-Bottom Stability Analysis Based on FEM Model

2011 ◽  
Author(s):  
Yong Bai ◽  
Zhimeng Yu
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Design Procedure ◽  
Element Model ◽  
The Finite Element Method ◽  
Fem Model ◽  
Engineering Software ◽  
Calculation Results ◽  
Pipeline Design ◽  
Element Method

Pipeline on-bottom stability is one of the sophisticated problems in subsea pipeline design procedure. Due to the uncertainty of the pipe-soil interaction and environment loads, including wave, current, or earthquake, etc., it is classified as the typical nonlinear problem. The Finite Element Method is introduced into pipeline engineering several years ago. More and more special engineering software such as AGA, PONDUS are available in market. However, when doing a project, some abnormal data was found when compared the DnV calculation results and AGA. In order to know the behavior of pipeline on seabed under wave and current load, finite element method – ABAQUS is introduced to do this analysis. The ABAQUS/explicit is used to simulate 600s pipeline dynamic response. The pipeline is supposed to be exposed on seabed and the selected seabed model is large enough to avoid the edge effect. ABAQUS calculation results are compared with the requirements in DnV rules to verify the validity of finite element model.

Numerical Study of an Impusively Loaded Vessel Containing Double Versus Single Closure Bolt Patterns

2017 ◽  
Author(s):  
Joseph E. D. Hess
Keyword(s):  
Finite Element ◽  
Structural Integrity ◽  
Numerical Study ◽  
Axial Loading ◽  
Element Model ◽  
Pressure Vessels ◽  
Bolted Joint ◽  
Single Row ◽  
Asme Code ◽  
Calculation Results

Impulsively loaded pressure vessels are often closed using a bolted joint configured in a double staggered row pattern. The bolted joint design must maintain the placement of the vessel opening covers to support the structural integrity of the shell and also provide the necessary preload of sealing surfaces for leak prevention. Good design practice suggests configuring tensile loaded bolted joints with a double rows pattern in order to minimize prying against the bolt head induced by localized moments. Double bolt row patterns allow moments induced by load offsets to be reacted through contact of the faying surfaces of the bolted members and if separation occurs by differential axial loading of the two bolt rows. This acts to reduce direct prying of the mated members against the bolt heads. Material cost and operational time savings could be realized if a single bolt row design with acceptable performance was implemented. In this paper a detailed finite element model is described and calculation results are presented for two vessel configurations subjected to an impulsive load; a double staggered 64 bolt pattern and a single row 32 bolt pattern. Finite element results are compared to each other and to the rules of ASME Code Case 2564 in Section VIII, Division 3. Special attention is given to the loading induced in the bolts and to the relative deflection of faying surfaces containing seals. It will be shown that reducing the bolt count per opening from 64 to 32 results in increased peak response of the bolts, seal opening gaps, and shell. Nonetheless a single row bolt pattern does appear feasible and within the bounds of the Code Case.

Study on the Surporting Mechanism of Precision Turning Process of Big-Diameter Length Rate Shaft by the Central Frame

2012 ◽  
Vol 538-541 ◽  
pp. 2139-2142
Author(s):  
Guo Zhi Zhang
Keyword(s):  
Probability Theory ◽  
Finite Element ◽  
Elastic Modulus ◽  
Theoretical Basis ◽  
Control Mechanism ◽  
Element Model ◽  
Turning Process ◽  
Precision Turning ◽  
Calculation Results ◽  
Theoretical Mechanics

Deformation of the big-diameter length rate shaft and turning process control mechanism were studied. When it was supported by the central frame, its theoretical mechanics models were established. Based on probability theory, considering the randomness of cutting force, elastic modulus, its length and its diameter, its theoretical model was established to calculate its standard deviation of the roundness. Moreover, its dynamic response finite element model was established, and the model was verified through comparison with the theoretical calculation results. The study provides the method and theoretical basis for the precision turning process planning of the big-diameter length rate shaft.

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