scholarly journals A Symplectic Method of Numerical Simulation on Local Buckling for Cylindrical Long Shells under Axial Pulse Loads

2021 ◽  
Vol 15 (1) ◽  
pp. 53-67
Author(s):  
Kecheng Li ◽  
Jianlong Qu ◽  
Jinqiang Tan ◽  
Zhanjun Wu ◽  
Xinsheng Xu
Keyword(s):  
Numerical Simulation ◽  
Local Buckling ◽  
Symplectic Method

Advanced Numerical Simulation to Meet Design Challenges of XHPHT Metallurgically Clad PIP Platform Riser

2011 ◽  
Author(s):  
Tao Zhao ◽  
Dan Lee ◽  
Kasra Farahani ◽  
Philip Cooper
Keyword(s):  
Numerical Simulation ◽  
Limit State ◽  
Local Buckling ◽  
Material Strength ◽  
Element Analysis ◽  
Robust Solution ◽  
Contact Behaviour ◽  
Corrosion Resistant Alloy ◽  
Stress And Deformation ◽  
Design Challenges

Pipe-in-pipe (PIP) systems are proposed for platform risers subjected to extra high pressure high temperature (XHPHT) shut-in condition, to meet the flow assurance and stringent strength and thermal criteria, and to mitigate design issues associated with wet insulation application. To further satisfy the corrosive fluid environments, the inner pipe of the PIP system is metallurgically clad with a Corrosion Resistant Alloy (CRA). These complex design challenges require advanced numerical simulation to correctly capture the complex PIP behaviour and clad-pipe effects in order to avoid overly conservative design, and to provide a robust and optimised solution. The equivalence of CRA clad pipe was investigated and analytically deduced, especially on the thermal expansion behaviour under the XHPHT environments. An advanced numerical simulation based on Finite Element Analysis (FEA) was subsequently carried out. A systematic family of FE models was developed to meet the design complexity, namely: global PIP platform riser model to capture the global behaviour, local PIP centraliser model to address contact behaviour, local bulkhead design model for PIP bulkhead design and optimisation, local girth weld model to address mismatches (high-low misalignment, thickness and material strength). In addition, a modal analysis was conducted based on a PIP model to ensure that the analysis accounts for centralisers, pre-stress and deformation effects. The eigenvalue computing is then used for free span analysis. Due to lack of limit state design codes for pipe bends and the fact that the allowable stress criteria can be overly conservative, a bend collapse capacity deduced from FEA was applied in accordance with DNV local buckling criteria. The analysis procedures developed are outlined and a XHPHT PIP platform riser design is presented. This paper aims to provide a robust solution to aid design by the application of advanced numerical simulation.

scholarly journals Experiment and Numerical Simulation for the Compressive Buckling Behavior of Double-Sided Laser-Welded Al–Li Alloy Aircraft Fuselage Panel

Materials ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 3599
Author(s):  
Yunlong Zhang ◽  
Wang Tao ◽  
Yanbin Chen ◽  
Zhenkun Lei ◽  
Ruixiang Bai ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Axial Compression ◽  
Failure Load ◽  
Local Buckling ◽  
Fringe Projection ◽  
Buckling Behavior ◽  
Welded Structure ◽  
Out Of Plane ◽  
Plane Displacement ◽  
Fringe Projection Profilometry

The aim of this work was to study the buckling behavior and failure mode of the double-sided laser-welded Al–Li alloy panel structure under the effect of axial compression via experimental and numerical simulation methods. In the test, multi-frequency fringe projection profilometry was used to monitor the out-of-plane displacement of the laser-welded panel structure during the axial compression load. In addition, the in-plane deformation was precisely monitored via strain gauge and strain rosette. The basic principles of fringe projection profilometry were introduced, and how to use fringe projection profilometry to obtain out-of-plane displacement was also presented. Numerical simulations were performed using the finite element method (FEM) to predict the failure load and buckling modes of the laser-welded panel structure under axial compression, and the obtained results were compared with those of the experiment. It was found that the fringe projection profilometry method for monitoring the buckling deformation of the laser-welded structure was verified to be effective in terms of a measurement accuracy of sub-millimeter level. The structural failure was caused by local buckling of the skin. The observed failure modes such as local buckling of the skin, bending deformation of the stringers, continuous fracture of several welds, and failure of local strength and stiffness were attributed to the deformed laser-welded panel structure under the axial compression. The predicted failure load in the numerical simulation was slightly smaller than that of the experimental test, and the error of the simulation result relative to the test result was −2.7%. The difference between them might be due to the fact that the boundary and loading conditions used in the FEM model could not be completely consistent with those used in the actual experiment.

scholarly journals Multi-Symplectic Method for the Logarithmic-KdV Equation

Symmetry ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 545
Author(s):  
Yu Zhang ◽  
Shaohua Li
Keyword(s):  
Numerical Simulation ◽  
Wave Propagation ◽  
Numerical Experiments ◽  
Kdv Equation ◽  
Symplectic Method ◽  
Symplectic Integrator ◽  
Fully Implicit ◽  
Box Scheme ◽  
Integration Approach ◽  
Intermediate Variables

The multi-symplectic integrator, as a numerical integration approach with symmetry, is known to have the characteristic of preserving the qualitative features and geometric properties of certain systems. Using the multi-symplectic integrator, the numerical simulation of the Gaussian solitary wave propagation of the logarithmic Korteweg–de Vries (logarithmic-KdV) equation was investigated. The multi-symplectic formulation of the logarithmic-KdV equation was explored by introducing some intermediate variables. A fully implicit version of the centered box scheme was used to discretize the multi-symplectic equations. In addition, numerical experiments were carried out to show the conservative properties of the proposed scheme.

scholarly journals Investigation on cold-formed steel built-up new innovative hat-shaped closed section under bending

2019 ◽  
Vol 11 (S1) ◽  
pp. 1-8
Author(s):  
P. Manikandan ◽  
A. Ezhilan
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Model ◽  
Local Buckling ◽  
Finite Element Simulations ◽  
Design Equation ◽  
Simply Supported ◽  
Parametric Studies ◽  
Cold Formed Steel ◽  
Test Result

Abstract The objective of this study is to make the experimental and finite element simulations of buckling behaviour of cold-formed steel (CFS) built-up hat-shaped closed section under simply supported end condition subjected to two-point loading. Numerical simulation is carried out using the software ABAQUS. The test result is compared with numerical results and good correlation is achieved. Next, for validation, a series of parametric studies are carried out using the validated numerical model, such as the effect of length, depth, width, thickness and angle of the inclined element. The local buckling and the interaction of local and flexural buckling are studied. To end with, a design equation is proposed in accordance with the direct strength method specification for CFS structure.

scholarly journals Numerical Study on the Local Buckling Behaviour of Bolted Steel Plates in Steel Jacketing

2017 ◽  
Vol 2017 ◽  
pp. 1-15 ◽  
Author(s):  
Xiao-liang Xu ◽  
Zhou-dao Lu ◽  
Ling-zhi Li ◽  
Chang-jiu Jiang
Keyword(s):  
Numerical Simulation ◽  
Experimental Study ◽  
Numerical Model ◽  
Parametric Study ◽  
Numerical Study ◽  
Local Buckling ◽  
Initial Imperfection ◽  
Field Capacity ◽  
Steel Plates ◽  
Previous Experimental Study

A numerical simulation was conducted to investigate the local buckling behaviour of the bolted steel plates in steel jacketing technique. The numerical model was firstly validated by the results of a previous experimental study. Then a parametric study was conducted to investigate the influence of different restraint measures on the local buckling behaviour and the sensitivity of the buckling behaviour to the initial imperfection. Fitted formulae were developed to calculate the structural field capacity of the bolted steel plates, and recommended values of stiffener size were also provided to facilitate the strengthening design of steel jacketing.

Water uptake by substituted amylose tablets: experimentation and numerical simulation

2009 ◽  
Vol 00 (00) ◽  
pp. 090904073309027-8
Author(s):  
H.W. Wang ◽  
S. Kyriacos ◽  
L. Cartilier
Keyword(s):  
Numerical Simulation ◽  
Water Uptake
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