Influence by Casing Geometric Imperfection on Anti-Collapse Strength with Finite Element Calculation

2012 ◽  
Vol 268-270 ◽  
pp. 1114-1118
Author(s):  
Ji Jun Xue ◽  
Peng Wang
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Wall Thickness ◽  
Element Model ◽  
Element Calculation ◽  
Geometric Imperfection ◽  
Thickness Increase ◽  
Collapse Strength ◽  
Wall Thickness Increase ◽  
Better Than

This essay was to build a finite element model to find the influence by oil casing geometric imperfection on anti-collapse strength. Two types of oil casing, Ф177.8×10.36mm/P110 andФ127×9.19mm/ P110, was taken for the calculation, considering the influence on anti-collapse strength by casing with two elements separately, ovality and non-uniformity of wall thickness. The calculation show that the anti-collapse strength of perfect casing perform better than that of imperfect casing. Ovality is an important factor for the anti-collapse strength, and the anti-collapse strength decrease rapidly as the ovality increase. Non-uniformity of wall thickness is the less important factor for anti-collapse strength, and the anti-collapse strength decrease slightly and slowly while the non-uniformity of wall thickness increase.

scholarly journals On the Adequacy of Shell Models for Predicting Stresses and Strains in Thick-Walled Tubes Subjected to Detonation Loading

2013 ◽  
Author(s):  
Neal P. Bitter ◽  
Joseph E. Shepherd
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Shell Model ◽  
Wall Thickness ◽  
Axial Strain ◽  
Nonlinear Behavior ◽  
Element Model ◽  
Shell Models ◽  
Axial Curvature ◽  
Detonation Loading

This paper analyzes the adequacy of shell models for predicting stresses and strains in thick-walled tubes subjected to detonation loads. Of particular interest are the large axial strains which are produced at the inner and outer surfaces of the tube due to bending along the tube axis. First, comparisons between simple shell theory and a static finite element model are used to show that the axial strain varies proportionally with wall thickness and inversely with the square of the axial wavelength. For small wavelengths, this comparison demonstrates nonlinear behavior and a breakdown of the shell model. Second, a dynamic finite element model is used to evaluate the performance of transient shell equations. This comparison is used to quantify the error of the shell model with increasing wall thickness and show that shell models can be inaccurate near the load front where the axial curvature is high. Finally, the results of these analyses are used to show that the large axial strains which are sometimes observed in experiments cannot be attributed to through-wall bending and appear to be caused instead by non-ideal conditions present in the experiments.

Thermal Effects on the Anchoring of Flexible Pipe Tensile Armors

2015 ◽  
Author(s):  
Olaf O. Otte Filho ◽  
Rafael L. Tanaka ◽  
Rafael G. Morini ◽  
Rafael N. Torres ◽  
Thamise S. V. Vilela
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Thermal Effects ◽  
Current Model ◽  
Element Model ◽  
Small Scale ◽  
Flexible Pipe ◽  
System A ◽  
Flexible Pipes ◽  
Better Than

In the design of flexible pipes, predict the anchoring behavior on end fittings is always challenging. In this sense, Prysmian Surflex has developed a finite element model, which should help the end fitting design as well the prediction of the structural behavior and the acceptable maximum loads. The current model considers that the contact between armor-resin is purely cohesive and has been suitable for the design of end fittings [1] and [2]. But tests and new studies [3] and [4] indicate that only cohesive assumption would not be the best approach. Experimental data from prototype tests also show that the current model would not predict acceptable results for loads higher than those used in previous projects. This document will describe a study developed considering the friction and thermal contraction, instead of the cohesive phenomenon in the anchoring behavior analysis. Small scale tests were conducted in order to understand the anchoring relation between the resin and the wire used in the tensile armor. For this purpose, a special test device was developed to simulate an enclosure system. A parametric study was also performed to identify the cooling temperatures, coefficients of friction and contact properties parameters taken from small scale tests. The finite element model considers the thermal effects during exothermic curing. Using the new parameters obtained, a second model was developed. This model consists of only one real shaped bended wire inside an end fitting cavity. To validate the model, samples were tested on laboratory according anchoring design. The results of this round of tests were studied and corroborate the argument that use friction and thermal effects is better than use only the cohesive condition.

scholarly journals Numerical Simulation and Experimental Study On Non-Axisymmetric Spinning With a Groove At The Middle of The Tube

2022 ◽  
Author(s):  
Zhen Jia ◽  
Xuan Wang ◽  
Yongping Shen ◽  
Yilian Xie ◽  
Xue Gong ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Wall Thickness ◽  
Element Model ◽  
Maximum Deviation ◽  
3D Finite Element ◽  
Transition Zones ◽  
3D Finite Element Model ◽  
Roller Path ◽  
Increasing Demand

Abstract Spinning is widely used in aerospace and automobile industries, and non-axisymmetric spinning is developing with the increasing demand of irregular shape forming. Based on this, an avoidance groove at the middle of the tube (AGMT) which has potential application value in aircraft structure weight reduction is proposed and formed by using non-axisymmetric die-less spinning. The roller path is analyzed. The relationship between radial displacement of roller and the rotation angle of the tube is deduced. Based on the roller path, 3D finite element model is established. Then, the AGMT spinning experiment is carried out to verify the simulation results. The maximum deviation between the simulation and experimental results is less than 15%. It is indicated that the 3D finite element model established in this study is reliable and the method for the AGMT forming is feasible. The wall thickness and strain-stress distributions are analyzed. The severe wall thicken and thinning occur in the transition zones, so more attention should be paid to these positions. The depth of the groove has great impact on the forming quality. Deeper groove results in distortion and larger wall thickness difference. The research laid a foundation for the further development and optimization of the AGMT spinning.

Modal Analysis for the Powertrain of Electric Vehicle by Finite Element Method

2013 ◽  
Vol 437 ◽  
pp. 140-145
Author(s):  
Fei Fei Chen ◽  
Peng Yu ◽  
Tong Zhang
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Element Model ◽  
Element Calculation ◽  
Modal Test ◽  
Vibration Properties ◽  
Automotive Powertrain ◽  
The Finite Element Model

The finite element model of an electric automotive powertrain is the basis of the research on its vibration and noise. In this paper, the vibration properties of dynamically-loaded housing are first obtained based on finite element calculation,which is testified by the modal test .It provides the reference for the establishing of electric automotive powertrain.

Out-of-Plane Stability Analysis of U-Section Pin-End Steel Arch

2013 ◽  
Vol 351-352 ◽  
pp. 169-173
Author(s):  
Kuan Tang Xi ◽  
Jin Li ◽  
Tie Gang Zhou ◽  
Qing Xing Xu
Keyword(s):  
Finite Element ◽  
Stability Analysis ◽  
Finite Element Model ◽  
Element Model ◽  
Load Models ◽  
Out Of Plane ◽  
Radial Loading ◽  
Better Than

Two kinds of finite element model which can reflect the effects of different loading positions were constructed with Beam 188 and Shell 181. Effects of different restraints, load models and rise-span ratios on out-of-plane buckling were studied by comparing results of fixed arches with that of pin-end arches under three loading models. It is conservative to design by employing results of radial loading. As for out-of-plane stability, pin-end arches are better than fixed arches when rise-span ratio is big. Compared with U-section pin-end circular arches with diaphragm, those with batten plates have batter out-of-plane stability, and they are more economical and easier to construct.

Out-of-Plane Stability Analysis of I-Section Steel Arch

2013 ◽  
Vol 405-408 ◽  
pp. 781-785
Author(s):  
Kuan Tang Xi ◽  
Jin Li ◽  
Tie Gang Zhou ◽  
Tao Lin
Keyword(s):  
Finite Element ◽  
Stability Analysis ◽  
Finite Element Model ◽  
Element Model ◽  
Buckling Loads ◽  
Load Models ◽  
Out Of Plane ◽  
Radial Loading ◽  
Better Than

Finite element model which can reflect the effects of different loading positions were constructed with Beam 188. Effects of different restraints, load models and rise-span ratios on out-of-plane buckling were studied by comparing results of fixed arches with that of pin-end arches under three loading models. It is conservative to design by employing results of radial loading. For ideal restraints, out-of-plane stability of pin-end arches is better than fixed arches when rise-span ratio is big. Effects of different loading positions on out-of-plane buckling were studied. Buckling loads of arches which are loaded at arch-axises are bigger than those of top flanges, but smaller than those of bottom flanges.

Influences of Blank Holding Force on Stamping of Large Ellipsoidal Heads Based on Simulation

2012 ◽  
Vol 217-219 ◽  
pp. 2097-2100 ◽  
Author(s):  
Zheng Zhi Luo ◽  
Jing Zeng ◽  
Jin Peng Yu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Wall Thickness ◽  
Computational Efficiency ◽  
Adaptive Mesh ◽  
Element Model ◽  
Experimental Results ◽  
Forming Quality ◽  
Sheet Stamping ◽  
Blank Holding Force

Ellipsoidal heads is a important composition of railways tank car. Sheet stamping process is a common method used for manufacturing ellipsoidal heads. An accurate and efficient finite element model was developed for analysis and prediction of ellipsoidal heads forming quality, with different degrees of reduction deformation at different binder forces considered, and self-adaptive mesh were adopted to improve computational efficiency and quality. And the results of simulation was validated by experimental results. Based on this finite element model, the distributions of stress, strain and wall thickness during this process were obtained.

Collapse Behaviour of Damaged Panels With a Dimple Imperfection

2007 ◽  
Author(s):  
Rui M. Lui´s ◽  
Malgorzata Witkowska ◽  
C. Guedes Soares
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Linear Analysis ◽  
Severe Problem ◽  
Collapse Strength ◽  
Non Linear ◽  
Compressive Loads ◽  
The Finite Element Model

This paper deals with the influence that a localised damage induced dimple imperfection can have on the ability of a panel to resist in-plane compressive loads. A single damaged plate on a ship is not a severe problem, but if enough plates have been damaged then the ability of a panel to carry its intended load can be compromised. In this study a finite element non-linear analysis of panels having different geometry is carried out in order to identify the influence of various parameters on the collapse strength. The finite element model used is of a panel, 3 plates long and 3 plates across. It was found that the position of the dimple imperfection on the panel is an important factor, that the dimple imperfection not only reduces the collapse strength but induces a more violent collapse and that it has an influence over the mode of collapse.

Simulation of Taper Roll Deviation Rectification Ability in Continuous Annealing Furnace

2014 ◽  
Vol 904 ◽  
pp. 320-324
Author(s):  
Jian Shao ◽  
An Rui He ◽  
Wen Quan Sun
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Optimization Design ◽  
Element Model ◽  
Continuous Annealing ◽  
Straight Section ◽  
Annealing Furnace ◽  
Calculation Results ◽  
Continuous Annealing Furnace ◽  
Better Than

Running deviation of cold strip affects smooth operation in continuous annealing furnace, and the taper roll technology has positive significance for the prevention of strip deviation. In this paper, a finite element model of cold strip in continuous annealing furnace is established, and it can be used to analysis deviation rectification ability of single taper roll with different conical height and straight section length, double taper roll with different total conical height, straight section length and taper ratio. The calculation results show that the conical height is the most important factor for deviation rectification, and the deviation rectification ability of double taper roll is better than single taper roll. The results provide reference for taper roll optimization design in continuous annealing furnace.

Finite Element Analysis of Woven Fabric Laminates Structural Strength

2013 ◽  
Vol 785-786 ◽  
pp. 199-203 ◽  
Author(s):  
Gang Tong ◽  
Tong Fei Liu
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Finite Element Model ◽  
Structural Strength ◽  
Element Model ◽  
Finite Element Calculation ◽  
Woven Fabric ◽  
Element Calculation ◽  
Element Analysis

The characteristics of the woven fabric laminates structure is described. The steps and method of building the woven fabric laminates structure finite element model in MSC Patran is provided. The accuracy of this method is verified by a group of finite element calculation and experimental data.

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