scholarly journals Mechanical Response of Gasketed Bell-and-Spigot Joint of Concrete Pipeline under Multifield Coupling

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Hang He ◽  
Hongyuan Fang ◽  
Xueming Du ◽  
Bin Li
Keyword(s):  
Flow Field ◽  
Mechanical Response ◽  
Coupling Effect ◽  
Circumferential Stress ◽  
Traffic Load ◽  
Vertical Deformation ◽  
Finite Element Software ◽  
Concrete Pipe ◽  
Internal Fluid ◽  
Pipe Joint

Concrete pipe may suffer joint failure under the coupling effect of internal fluid and overlying load, which may lead to pipe leakage. Based on Abaqus and Fluent finite element software, a three-dimensional refined model of drainage pipeline with gasketed bell-and-spigot joints and flow field model inside the pipeline was established. Fully considering the compression of the gasket during pipeline assembly and pipe-soil interaction, the fluid-structure coupling numerical simulation was carried out by using the MpCCI (Mesh-based parallel Code Coupling Interface) platform, and the mechanical response of the concrete pipe joint under the multifield loads coupling effects of burial condition, traffic load, and internal fluid was studied. The accuracy of the coupling model was verified through the full-scale tests that have been carried out. The influences of various factors on the circumferential stress and vertical deformation of the joint were mainly studied. The result reveals that the influence of different working conditions on the circumferential stress of the pipe joint is mainly concentrated on the crown and the invert of the joint, the areas vulnerable to tensile damage. The change of flow field leads to a slight difference in the vertical deformation of the joint, while variation in gasket hardness and cushion compactness has a certain influence on the vertical deformation of the joint. The change of buried depth has a negative correlation to the vertical deformation of the joint, and the change of load position has a significant nonlinear effect. The result provides a theoretical basis for further research on the mechanical mechanism of the pipeline joints during operation.

The Analysis of Rotary Kiln Thermal Characteristics Based on ANSYS and FLUENT

2013 ◽  
Vol 834-836 ◽  
pp. 1523-1528
Author(s):  
Xiao Yan Song ◽  
Qin Fan
Keyword(s):  
Finite Element ◽  
Temperature Field ◽  
Rotary Kiln ◽  
Mechanical Response ◽  
Coupling Effect ◽  
Interpolation Method ◽  
Combustion Process ◽  
Gas Temperature ◽  
Finite Element Software ◽  
Operation Conditions

In this paper, the FLUENT finite element software is used to simulation analyze the rotary kiln, kiln gas combustion process and gas-solid coupling effect. The kiln and rotary kiln of gas temperature field is calculated and then imported into the ANSYS software as an initial condition to complete the reconstruction of the temperature field and using the node interpolation method to carry out thermal stress analysis. Through the joint simulation analysis based on FLUENT and ANSYS finite element software, the analysis of rotary kiln combustion process, the heat transfer and the mechanical response of the structure can be implemented under the same condition, making the simulation results of rotary kiln more related to practical operation conditions. The method and results presented have significant theoretical guidance for the research and development of new types of rotary kiln.

scholarly journals Simulation of Cyclic Loading on Pipe Elbows Using Advanced Plane-Stress Elastoplasticity Models1

2020 ◽  
Vol 143 (2) ◽  
Author(s):  
Konstantinos Chatziioannou ◽  
Yuner Huang ◽  
Spyros A. Karamanos
Keyword(s):  
Cyclic Loading ◽  
Large Scale ◽  
Mechanical Response ◽  
Low Cycle Fatigue ◽  
Constitutive Relations ◽  
Cyclic Plasticity ◽  
Integration Scheme ◽  
Repeated Loading ◽  
Finite Element Software ◽  
Hardening Models

Abstract This work investigates the response of industrial steel pipe elbows subjected to severe cyclic loading (e.g., seismic or shutdown/startup conditions), associated with the development of significant inelastic strain amplitudes of alternate sign, which may lead to low-cycle fatigue. To model this response, three cyclic-plasticity hardening models are employed for the numerical analysis of large-scale experiments on elbows reported elsewhere. The constitutive relations of the material model follow the context of von Mises cyclic elasto-plasticity, and the hardening models are implemented in a user subroutine, developed by the authors, which employs a robust numerical integration scheme, and is inserted in a general-purpose finite element software. The three hardening models are evaluated in terms of their ability to predict the strain range at critical locations, and in particular, strain accumulation over the load cycles, a phenomenon called “ratcheting.” The overall good comparison between numerical and experimental results demonstrates that the proposed numerical methodology can be used for simulating accurately the mechanical response of pipe elbows under severe inelastic repeated loading. Finally, this paper highlights some limitations of conventional hardening rules in simulating multi-axial material ratcheting.

scholarly journals Numerical simulation for fracture network evolution in coal-bearing gas reservoir reconstruction based on damage theory

2021 ◽  
Vol 25 (6 Part B) ◽  
pp. 4423-4429
Author(s):  
Hai-Xiao Lin ◽  
Qiu-Yu Pan ◽  
Bang-Hua Yao ◽  
Wen-Long Shen ◽  
Feng Yang
Keyword(s):  
Numerical Simulation ◽  
Mechanical Response ◽  
Coupling Effect ◽  
Fracture Network ◽  
Network Evolution ◽  
Geological Strength Index ◽  
Forming Process ◽  
Brittle Damage ◽  
Coal Rock ◽  
Numerical Calculation Method

Based on the characteristics of mechanical response of coal rock under loading, an elastic-brittle damage constitutive relation of coal rock has been proposed, which has been extended to the 3-D stress state, based on the geological strength index. Besides, a numerical calculation method based on the elastic-brittle damage the?ory has been developed, by analyzing the seepage-stress coupling effect. Then, a computing program for fracture network transformation has been composed to perform numerical simulation of forming process of coal rock under different working conditions, by the APDL language in the ANSYS software platform. The mechanical mechanism of fracture network forming process of coal rock has been further analyzed.

Research on Loading Test Scheme of Vehicular Bridge-Footbridge Combined Double-Deck Cable-Stayed Bridges

2013 ◽  
Vol 361-363 ◽  
pp. 1081-1085
Author(s):  
Meng Yan ◽  
Yong Qing Yang ◽  
Yuan Yuan ◽  
Xiang Lin Zeng
Keyword(s):  
Coupling Effect ◽  
Test Methods ◽  
Test Scheme ◽  
Bridge Structure ◽  
Loading Test ◽  
Finite Element Software ◽  
Working Stress ◽  
Upper Deck ◽  
Dynamic Performances ◽  
Capacity Loading

In order to check whether the bridge structure is in good working condition, meeting the requirements of carrying capacity and traffic capacity, loading test should be conducted to the Huiketing No.1 Bridge in Mianyang city. The bridge is a double-deck cable-stayed bridge, the upper deck of which works as a footbridge and is connected by 6 chain poles to the lower deck which works as a vehicular bridge. Since the bridge structure is novel, the working stress state is complicated and the coupling effect of the two decks is notable, little referential experience could be found from other bridges. The loading test uses sandbags as equivalent to pedestrian loads on the footbridge and adopts heavy trucks to imitate the design vehicle loads on the vehicular bridge. According to the structural symmetry of the whole bridge and the analysis of its static and dynamic performances in the finite element software, the optimized loading project is finalized. Test methods and analysis results of this footbridge can be used as reference in loading test of similar bridges in the future.

Phenomenological and Structural Aspects of the Mechanical Response of Arteries

2000 ◽  
Author(s):  
Ray W. Ogden ◽  
Christian A. J. Schulze-Bauer
Keyword(s):  
Residual Stresses ◽  
Mechanical Response ◽  
Physiological State ◽  
Circumferential Stress ◽  
Morphological Structure ◽  
Cylindrical Tube ◽  
Single Layer ◽  
Theory Of Elasticity ◽  
Starting Point ◽  
Circular Cylindrical Tube

Abstract In this paper we present some new data from extension-inflation tests on a human iliac artery and then, on the basis of the nonlinear theory of elasticity, we examine a possible model to represent this data. The model considers the artery initially as a thick-walled circular cylindrical tube which may consist of two or more concentric layers. In order to take some account of the architecture (morphological structure), each layer of the material is regarded as consisting of two families of mechanically equivalent helical fibers symmetrically disposed with respect to the cylinder axis. The resulting material properties are then orthotropic in each layer. General formulas for the pressure and the axial load in the symmetric inflation of an extended tube are obtained. The starting point is the unloaded circular cylindrical configuration, but (in general unknown) residual stresses are included in the formulation. The model is illustrated by specializing firstly to the case of a single layer so that the consequences of the hypothesis of uniform circumferential stress in the physiological state can be examined theoretically. This enables the required residual stresses to be calculated explicitly. Secondly, the equations are specialized for the membrane approximation in order to show how certain important characteristics of the experimental data can be replicated using a relatively simple anisotropic membrane model.

Study on the Main Characteristics of Reflective Cracking in the Asphalt Overlay on an Old Cement Pavement

2020 ◽  
Vol 980 ◽  
pp. 244-253
Author(s):  
Chun Fu Zhu ◽  
Pei Feng Cheng ◽  
Guang Yu Zhao
Keyword(s):  
Working Conditions ◽  
Coupling Effect ◽  
Shear Crack ◽  
Effect Of Temperature ◽  
Reflective Cracking ◽  
Effective Prevention ◽  
Finite Element Software ◽  
Asphalt Overlay ◽  
Prevention And Treatment ◽  
Reflection Crack

The purpose of this study is to explore the forms and characteristics of reflection crack in asphalt overlay of old cement pavement, so as to provide reference for effective prevention and treatment of reflection crack.By means of ANSYS finite element software, considering the coupling effect of temperature and vehicle in different working conditions, the influence of cooling on asphalt overlay was analyzed, and the location and form of crack were discussed.The analysis results show that tensile crack and shear crack are more likely to occur near the joint of old cement pavement, and shear crack is more likely to occur in areas outside the joint, about 1/2 wheel length from the joint of cement pavement.The prevention and treatment of crack at different locations should be carried out according to different working conditions.

The Coupling Effect of Composite Material with Foundation Pile and Soil Mass

2012 ◽  
Vol 580 ◽  
pp. 477-480
Author(s):  
Yong Suo Li
Keyword(s):  
Skin Friction ◽  
Stress Responses ◽  
Computer Aided Design ◽  
Mechanical Response ◽  
Coupling Effect ◽  
Design Method ◽  
Ground Surface ◽  
Friction Stress ◽  
Soil Mass ◽  
Positive Skin

The computer-aided design method is used in modeling for the interaction between pile and geotechnical material soil. The behavior of the shear coupling springs is identical to the shear behavior of a grouted cable. Then a numerical model is founded by FLAC3D, deformation and stress responses are obtained as well as the mechanical response of pile during calculation, whose result reveals the mechanism of pile with soil under the load of gravitation and load transferring mode along pile shaft for different ground surface surcharge load, during simulation, the soil consists of two types, the less consolidated soil and normal consolidated soil, both the negative skin friction stress and positive skin friction stress are studied.

Dynamic Response Analysis of Submarine Pipeline under Action of Current

2014 ◽  
Vol 1061-1062 ◽  
pp. 767-770
Author(s):  
Fan Lei ◽  
Yu Lin Deng ◽  
Xiao Hua Zhao
Keyword(s):  
Finite Element ◽  
Flow Field ◽  
Dynamic Response ◽  
Drag Force ◽  
Response Analysis ◽  
Vibration Characteristic ◽  
Submarine Pipeline ◽  
Structure Interaction ◽  
Finite Element Software ◽  
Distribution Of Flow

It’s important to study the vibration characteristic of submarine pipelines under current for reducing the harmful vibration. Research on fluid-structure interaction of submarine pipeline under current was presented. The pressure and velocity distribution of flow field around pipe with different velocity of flow were studied by ANSYS finite element software. The results show that the pipe is under the action of drag force along the direction of flow. The drag force increases with the flow velocity.

Mechanics Analysis and Construction Method of Prestressed Concrete Pipe

2013 ◽  
Vol 351-352 ◽  
pp. 30-33
Author(s):  
Wei Wu ◽  
Jing Ji
Keyword(s):  
Prestressed Concrete ◽  
Simulation Analysis ◽  
External Pressure ◽  
Construction Process ◽  
Work Process ◽  
Finite Element Software ◽  
Concrete Pipe ◽  
Mechanics Analysis ◽  
Analysis Design ◽  
Design And Construction

Simulation analysis on prestressed concrete pipe was carried out by using finite element software ANSYS. The internal and external pressure which the pipeline is subject to is simulated in real work process, and deformation and stress distribution of building pipeline structure are got. We have great understanding in the mechanical properties, at the same time give a detailed introduction for the prefabrication and on-site construction process. Three aspects in this paper for analysis, design and construction can provide safe and reliable reference for design and construction of similar pipeline structure.

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