Burst Capacity of Reinforced Thermoplastic Pipe (RTP) Under Internal Pressure

2011 ◽  
Author(s):  
Yong Bai ◽  
Fan Xu ◽  
Peng Cheng ◽  
Mohd Fauzi Badaruddin ◽  
Mohd Ashri
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Internal Pressure ◽  
Mathematical Analysis ◽  
Low Cost ◽  
Failure Process ◽  
Shell Element ◽  
Element Analysis ◽  
Burst Strength ◽  
The Finite Element Analysis

Being corrosion resistant, light weight, and easy to install at relatively low cost, Reinforced Thermoplastic Pipe (RTP) is now increasingly being used for offshore operations. RTP pipe in this study is mainly composed of three layers: a wound high strength fiber reinforced layer to improve the resistance of the pipe to internal pressure; a plastic inner layer to transport fluid; a plastic outer layer to protect the pipe. A precise calculation of the burst strength of RTP pipe will be useful for the safe use of RTP pipe’s internal pressure resistance. The Finite Element Analysis (FEA) method and mathematical analysis are employed to study the properties of pipe under internal pressure. The Finite Element Analysis method is used to simulating the pipe under increasing internal pressure using ABAQUS. The model is established with the conventional shell element, and the anisotropic property of plastic is also considered in the model. In the mathematical analysis, the reinforcement layer of the pipe is assumed to be anisotropic and other layers are assumed to be isotropic. Based on the three-dimensional (3D) anisotropic elasticity theory, an exact elastic solution for burst strength of the pipe under internal pressure has been studied. This paper focus on the calculation of RTP pipe’s burst strength, using mathematical approach and FEA approach, on the basis of elaborated study of RTP pipe’s failure process. Our results from mathematical and FE simulation agree each other for burst pressure of the RTP pipe. Our FEA models are also compared with the experimental research in order to validate our FEA models.

Distortion Simulation of Unsymmetrical Composite Laminates Using the Finite Element Analysis Method

2007 ◽  
Vol 546-549 ◽  
pp. 1563-1566
Author(s):  
Min Li ◽  
Bao Yan Zhang ◽  
Xiang Bao Chen
Keyword(s):  
Experimental Data ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Composite Laminates ◽  
Shell Element ◽  
Element Analysis ◽  
Unsymmetric Laminates ◽  
The Finite Element Analysis ◽  
Simulation Results ◽  
The Difference

Unsymmetric composite laminates were benefit to reducing the structure weight of some aircrafts. However, the cured unsymmetric laminates showed distortion at room temperature. Therefore, predicting the deformation before using the unsymmetrical composite is very important. In this study an attempt was made to predict the shapes of some unsymmetric cross-ply laminates using the finite element analysis (FEA). The bilinear shell-element was adopted in the process. Then the simulation results were compared with the experimental data. The studies we had performed showed that the theoretical calculation agreed well with the experimental results, the predicted shapes were similar to the real laminates, and the difference between the calculated maximum deflections and the experimental data were less than 5%. Hence the FEA method was suitable for predicting the warpage of unsymmetric laminates. The error analysis showed that the simulation results were very sensitive to the lamina thickness, 2 α and (T.

scholarly journals Burst Strength Analysis of Casing With Geometrical Imperfections

2006 ◽  
Vol 129 (4) ◽  
pp. 763-770 ◽  
Author(s):  
Xiaoguang Huang ◽  
Yanyun Chen ◽  
Kai Lin ◽  
Musa Mihsein ◽  
Kevin Kibble ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Strength Analysis ◽  
Element Analysis ◽  
Burst Strength ◽  
The Finite Element Analysis ◽  
Geometrical Imperfections ◽  
Major Factors

Accurately predicting the burst strength is very important in the casing design for the oil and gas industry. In this paper, finite element analysis is performed for an infinitely long thick walled casing with geometrical imperfections subjected to internal pressure. A comparison with a series of full-scale experiments was conducted to verify the accuracy and reliability of the finite element analysis. Furthermore, three predictive equations were evaluated using the test data, and the Klever equation was concluded to give the most accurate prediction of burst strength. The finite element analysis was then extended to study the effects of major factors on the casing burst strength. Results showed that the initial eccentricity and material hardening parameter had important effects on the burst strength, while the effect of the initial ovality was small.

Displacement Measurement of Derrick Model Base on the Non-Contact Type Video Measurement Technology

2013 ◽  
Vol 318 ◽  
pp. 125-129
Author(s):  
Xiao Bing Xu ◽  
Xing Han ◽  
Li Yu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Low Cost ◽  
Displacement Measurement ◽  
Measurement Technology ◽  
Element Analysis ◽  
Model Base ◽  
Contact Type ◽  
The Finite Element Analysis ◽  
Measurement Results

In this paper, a non-contact type video measurement technology is introduced, and the displacements of derrick model are measured by this technology. Then comparative analysis between this measurement results and the finite element analysis results showed that the precision of measurement displacement of derrick model used this technology is good. Therefore, this technology is an effective, convenient, safe, low cost, low labor and a new method of derrick displacement measurement.

Analysis of Polyester Reinforced Flexible Composite Pipe Under Internal Pressure

2019 ◽  
Author(s):  
Xinyu Sun ◽  
Yong Bai ◽  
Xiaojie Zhang ◽  
Chang Liu ◽  
Jiannan Zhao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Internal Pressure ◽  
Polyester Fiber ◽  
Burst Pressure ◽  
Market Demand ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Composite Pipe ◽  
Composite Pipes

Abstract In recent years, petroleum and natural gas industry technology continues to develop, so the market demand for polyester fiber reinforced flexible composite pipe is increasing. Polyester reinforced flexible composite pipe is widely used in practical production, which is based on thermoplastic material and winded by polyester fiber. Based on the anisotropic uniformity of polyester reinforced flexible composite pipes, this paper focuses on the mechanical behavior of flexible composite pipes under internal pressure. By using numerical analysis method, the stress-strain change and burst pressure model of polyester reinforced pipe under internal pressure are established. The short-term burst pressure test is carried out to obtain the burst pressure of the reinforced pipe. The finite element analysis software ABAQUS is used to establish finite element model for simulation analysis. According to the generated test data, the correctness of the finite element analysis results is verified. The sensitivity of winding angle and diameter-thickness ratio to the pressure was studied to further understand the mechanical properties of polyester reinforced composite pipe.

Study on statics and fatigue analysis of dental implants in the descending process of alveolar bone level

2020 ◽  
Vol 234 (8) ◽  
pp. 843-853
Author(s):  
Xuetao Zhang ◽  
Jian Mao ◽  
Yufeng Zhou ◽  
Fangqiu Ji ◽  
Xianshuai Chen
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dental Implants ◽  
Alveolar Bone ◽  
Failure Process ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Bone Level ◽  
Implant System

Alveolar bone atrophy can directly cause a decrease in bone level. The effect of this process on the service life of dental implants is unknown. The aim of this study was to determine the failure forms of the two-piece dental implants in the descending process of alveolar bone level, and the specific states of the components during the failure process. The CAD software SolidWorks was used to establish the model of alveolar bone and dental implants in this article. The finite element analysis was used to analyze the statics of the dental implants in the host oral model. The finite element analysis results showed that the stress concentration point of the implant and abutment in the implant system has changed greatly during the descending process of alveolar bone level, and indirectly increased the fatigue life of the same fatigue risk point. At the same time, the dental implants were tested in vitro in the descending process of alveolar bone level. Then, the fracture of the implant system was scanned by scanning electron microscope. The fatigue test results proved the finite element analysis hypothesis the central screw first fractured under fatigue and then caused an overload break of the implant and abutment.

Finite Element Analysis of the Shock Absorber for Vehicle

2013 ◽  
Vol 706-708 ◽  
pp. 1361-1364
Author(s):  
Chao Fu Liu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Elastic Modulus ◽  
Internal Pressure ◽  
Shock Absorber ◽  
Structural Features ◽  
Static Characteristic ◽  
Characteristic Analysis ◽  
Element Analysis ◽  
The Finite Element Analysis

As for the structural features and the characteristics of fiber-reinforced rubber of a shock absorber for vehicle, this paper mainly focuses on its deformation and static characteristic analysis. A shock absorber whose type is JW2-5202 was analyzed in its performance characteristics of deformation with variations in cord elastic modulus and cord angle. According to the finite element analysis on the load vs. the displacement, and the internal pressure vs. the displacement, the results are in accordance with the test ones.

Evaluation of “Linearized” Stresses Without Linearization

2007 ◽  
Author(s):  
Andrzej T. Strzelczyk ◽  
San S. Ho
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Stress Concentration ◽  
Shell Element ◽  
Original Model ◽  
Element Analysis ◽  
Solid Element ◽  
The Finite Element Analysis ◽  
Inner Surface ◽  
Element Approach

ASME Code stress assessment of pressure vessels in the power generation industry is usually done by finite element analysis using one of the two approaches. In the first, “shell-element” approach, vessels are modeled out of shell elements; primary plus bending and primary plus secondary stresses are taken directly from the finite element analysis results and the alternating stresses are based on primary plus secondary stresses prorated by respective stress concentration factors. The strength of the “shell-element” approach is its simplicity; its weakness is problematic modeling of the stress concentration and some modeling difficulties (varying wall thickness, nozzle/vessel connectivity, pressure applied to the mid-surface instead of to the inner surface.) In the second, “solid-element” approach, vessels are modeled out of solid elements; “linearized” stresses can not be taken directly from the finite element analysis results, first they must be linearized, and only then, can be compared against their allowable counterparts; the alternating stresses can be based directly on the outer/inner-surface-node-stresses, provided that the mesh of the model is fine enough to account for the stress concentration effect. The strength of the “solid-element” approach is its high accuracy; its weakness is the time consuming, sometimes ambiguous, stress linearization process. This paper proposes a modification of the “solid-element” approach, in which the time consuming linearization process is replaced by a modification of the original model. To do so, a vessel must be modeled out of quadratic 20 node solid elements; the mesh density of the model (on its surface and through thickness) must be adequate for stress concentration representation and the mesh lines in the thickness direction must be more or less normal to the surfaces. The results from this original model can be taken directly for fatigue evaluation. To obtain the “linearized” stresses the original model must be slightly modified, specifically the number of elements through thickness must be reduced to one, and the reduced integration technique is recommended. For such a modified model, the nodal stresses are equivalent to the “linearized stresses” of the original model. The equivalence is discussed on a model of a circular nozzle attached to a cylindrical vessel. The vessel loads are pressure and thermal expansion.

scholarly journals Finite Element Analysis of Three-ring Reducer

2021 ◽  
Vol 1 (1) ◽  
Author(s):  
Emma Srebnik
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Building Materials ◽  
Low Cost ◽  
Analysis Method ◽  
Element Analysis ◽  
Compact Structure ◽  
Finite Element Analysis Method ◽  
The Finite Element Analysis ◽  
Working Principle

The tricycle reducer is widely used in many fields such as mining, petroleum and building materials because of its characteristics of large transmission ratio, compact structure and wide application, as well as its excellent carrying capacity and low cost. In order to understand the force of three-ring reducer, the finite element analysis method should be adopted. This paper, starting with the structure and working principle, carries out the multi-tooth meshing effect and the whole machine statics analysis, aiming to provide a reference for the optimization and perfection of the products.

scholarly journals FE Model of Low Grade Rubber for Modeling Housing’s Low-Cost Rubber Base Isolators

2018 ◽  
Vol 4 (1) ◽  
pp. 24 ◽  
Author(s):  
Hidajat Sugihardjo ◽  
Tavio Tavio ◽  
Yudha Lesmana
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Curve Fitting ◽  
Low Cost ◽  
Low Grade ◽  
Actual Behavior ◽  
Element Analysis ◽  
Fitting Procedure ◽  
The Finite Element Analysis ◽  
Ogden Model

An accurate selection of strain energy function (SEF) plays a very important role for predicting the actual behavior of rubber material in the finite element analysis (FEA). The common method for selecting the SEF is by using the curve fitting procedure. However, the behavior of some typical rubbers, such as low grade rubbers (average hardness value of 47.2), cannot be predicted well by only using the curve fitting procedure. To accurately predict the actual behavior of such specifically nearly incompressible material, a series of FEA were carried out to simulate the actual behavior of four physical testing materials, namely the uniaxial, the planar shear, the equibiaxial, and the volumetric tests. This FEA is intended to examine the most suitable constitutive model in representing the rubber characteristics and behavior. From the comparisons, it can be concluded that the Ogden model provides a reasonably accurate prediction compared to the remaining investigated constitutive material models. Finally, the appropriate SEF, i.e. the Ogden model, was adopted for modeling a low-cost rubber base isolator (LCRBI) in the finite element analysis (FEA). The simple uniaxial compression test of the LCRBI is required for validating that the selected SEF works for predicting the actual behavior of LCRBI.

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