Stress States and Interference in Double Adhesive Layer Scarf and Butt Joints

2002 ◽  
Author(s):  
Samar Teli ◽  
Erol Sancaktar
Keyword(s):  
Finite Element ◽  
Adhesive Layer ◽  
Load Ratio ◽  
Peak Stress ◽  
Interfacial Stress ◽  
Adhesively Bonded ◽  
Butt Joints ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Stress States

The stress interference effects adhesively bonded scarf and butt joints were investigated when an additional adhesive layer was incorporated in overall joint design. Finite element models were developed and analyzed to compare interfacial stress states and peak stresses on the double adhesive layer joints with those on the single adhesive layer joints with respect to the scarf angle, adhesive layer separation (ALS) and adhesive modulus. This comparison was done in terms of stress ratio calculated as a ratio of interfacial peak stress on double adhesive layer joint to that an single adhesive layer joint. The tensile task results were correlated with the finite element analysis (FEA) results in terms of load ratio calculated as a ratio of failure load on single adhesive layer joint to that on double adhesive layer joint. Six scarf angles (15°, 30°, 45°, 60°, 75° and 90°), three ALS and adhesives were analyzed for this study.

Reelability Assessment of Adhesively Bonded Mechanically Lined Pipe

2021 ◽  
Author(s):  
Grégory Alexandre Toguyeni ◽  
Jens Fernandez-Vega ◽  
Richard Jones ◽  
Martin Gallegillo ◽  
Joachim Banse
Keyword(s):  
Finite Element ◽  
Adhesive Layer ◽  
Element Model ◽  
Curing Temperature ◽  
Sensitivity Analyses ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Physical Test ◽  
Weld Overlay ◽  
Outer Pipe

Abstract A solution to prevent liner wrinkling in Mechanically Lined Pipes (MLP) with a standard 3.0mm thick liner during reeling, without the use of pressurisation, has been developed in the form of the GluBi® lined pipe. The liner being adhesively bonded to the outer pipe, its integrity is maintained despite the global plastic strain applied by the installation method. This new linepipe product has been qualified for offshore use through testing accompanied by a detailed Finite Element Analysis programme to fully capture the pipe and adhesive behaviours under and range of temperatures and loading conditions. The objective of this analysis program was to investigate the reelability of the GluBi® pipe. The instalability was defined as the capability of the pipe to tolerate cyclic plastic deformation representative of a typical pipeline installation by reeling without the formation of wrinkling of the CRA liner, and to maintain the integrity of the adhesive layer, particularly near the weld overlay at the pipe ends. Important areas of the GluBi® pipe design are the pipe extremities, particularly the transition between the liner and the weld overlay length. A detailed Finite Element model of the pipe was created. It captured all stages of the pipe manufacturing: pipe lining, hydrostatic expansion, adhesive curing, overlay weld deposition and reeling simulation. The pipe modelled was 312.1mm OD × 19.7mm WT SMLS 450 with a nominal 3.0mm thick Alloy 625 liner. An important validation work was performed to obtain a precise material response of the adhesive layer between liner and outer pipe. The adhesive mechanical properties were thus assessed in shearing and peeling over a range of temperatures covering all possible manufacturing and installation conditions. The model's elements and adhesive property modelling were validated against physical test results. Sensitivity analyses were done on the adhesive curing temperature, the geometry of the adhesive transition between the liner and the overlay weld at the pipe ends and on the liner thickness. The model was subjected to reeling simulation corresponding to Subsea 7's reel-lay vessels. The liner's integrity post reeling was assessed according to a range of acceptance criteria. These studies made it possible to establish parameter ranges for the safe installation of the linepipe.

Failure Analysis of Pipeline With Pore Defects

2015 ◽  
Author(s):  
Yan Li ◽  
Jian Shuai ◽  
Yan Zhou ◽  
Kui Xu
Keyword(s):  
Finite Element ◽  
Welding Process ◽  
Structural Condition ◽  
Element Analysis ◽  
Acceptance Criterion ◽  
The Finite Element Analysis ◽  
Numerical Research ◽  
Stress States ◽  
Welding Defect ◽  
Welding Procedure

During the welding process, the pore defects may be produced in the weld body. Statistic results showed that welding defect is one of the main causes for pipeline failure. According to this factor, this paper presents a detailed description of numerical research to assess the structural condition of circumferential weld seam pipeline with pore defects. Based on elastic-plastic theory, a set of nonlinear finite element analyses of pipelines with pore defects are carried out to study the influence of different sizes and locations on failure mode. Aimed at evaluating the load bearing capacity of pipeline with pore defects, limit stress states are investigated in this paper by using the finite element analysis. By comparing the present analysis results with the relevant standards, a proposed acceptance criterion is brought out. The results presented in this paper can be used to make suggestions on welding procedure qualification and continued safe operation of pipelines.

A Numerical Investigation of the Performance of a Nacre-Like Composite under Blast Loading

2016 ◽  
Vol 846 ◽  
pp. 464-469 ◽  
Author(s):  
Abdallah Ghazlan ◽  
Tuan D. Ngo ◽  
Nelson Lam ◽  
Phuong Tran
Keyword(s):  
Finite Element ◽  
Blast Loading ◽  
Adhesive Layer ◽  
Organic Matrix ◽  
Adhesive Bond ◽  
Element Model ◽  
Element Analysis ◽  
Adhesive Bonds ◽  
The Finite Element Analysis ◽  
Brick And Mortar

This paper investigates the behaviour of a bio-inspired finite element composite model (that mimics the structure of nacre, the inner layer of molluscan shells) under blast loading. Nacre, which has attracted the attention of researchers over the past few decades, comprises 95% aragonite, brittle voronoi-like polygonal tablets that are joined by an organic matrix and arranged in a brick and mortar type structure. In this work, the finite element model developed herein was constructed using voronoi diagrams and geometric algorithms capable of automatically generating staggered layers of voronoi-like aluminium tablets bonded together by a vinylester adhesive layer. Many studies have led to the belief that the magnificent toughness of nacre is mainly attributed to the inter-platelet adhesive bonds. Results obtained from the finite element analysis show that this is indeed true, and it is imperative that the adhesive bond exhibits adequate toughness in order to be able to spread damage across the entire composite, thereby delaying localised failure.

scholarly journals Experimental Investigation on Hip Implant Materials Development through Analytical and Finite Element Analysis: 3D Modelled Computed Tomography

2021 ◽  
Vol 12 (3) ◽  
pp. 4103-4125
Keyword(s):  
Computed Tomography ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Peak Stress ◽  
Element Analysis ◽  
Materials Development ◽  
Analytical Analysis ◽  
Hip Implant ◽  
Material Development ◽  
The Finite Element Analysis

Biomechanics is the interdisciplinary area comprising biomedical and mechanical domain, continuations in research of alternative and sustainable materials, which refers to the mechanical examine. This current work focuses on hip implant material development through analytical and finite element analysis. The femur bone head is 3D modeled through computed tomography (CT) images extracted data and modeled in SOLIDWORKS. The analytical analysis is performed on the femur head through Hertzian theory. The finite element analysis (FEA) (static structural analysis) is carried out in the ANSYS 19.2. The materials considered for the FEA are NbTiZrMo alloy, PEEK and CFR-PEEK for the hip implant. The analytical analysis is performed for eight different human routine activities, and the highest peak stress value is obtained for walking fast. The peak stress values obtained in FEA for CFR-PEEK material implant are lower than the maximum peak stress obtained by analytical analysis. The stress value obtained for CFR-PEEK material is somewhat higher than PEEK, but the contact pressure for PEEK material is way higher than CFR-PEEK material implant. So, it is concluded that the CFR-PEEK material is the ideal alternative as compared to other materials.

Experimental and finite element investigation of a local dent on a pressurized pipe

1992 ◽  
Vol 27 (3) ◽  
pp. 177-185 ◽  
Author(s):  
L S Ong ◽  
A K Soh ◽  
J H Ong
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Surface Defect ◽  
Peak Stress ◽  
Plastic Collapse ◽  
Hoop Strain ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Local Dent ◽  
Good Agreement

The problem of a local dent on a pressurized pipe is studied in this paper. Two case problems of dent are considered - a plain local dent (a smooth local dent without a surface defect), and a local dent associated with a loss of thickness defect. The strain gauging test and the finite element analysis on the plain local dent showed that the strain distributions in the local dent are different from those of a long and continuous dent. The maximum hoop strain in the local dent is located at the flank of the dent, along the dent axial axis, whereas in the case of the long dent, it is located at the root of the dent. In addition, the peak stress in the local dent is generally lower than that in the long dent. To estimate the stress concentration in the local dent using the analysis for the long dent would be grossly overestimated. The burst pipe tests on 17 dented pipes showed that the pipe failures were generally insensitive to the existence of the local dents. The pipe failures were found to be due to the loss-of-thickness defect. The comparison of results between the burst pipe tests and the plastic collapse formula shows reasonably good agreement.

Normal Stress Distributions in a Single-Lap Adhesively Bonded Joint under Tension

2012 ◽  
Vol 530 ◽  
pp. 9-13 ◽  
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element ◽  
Normal Stress ◽  
High Stress ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Normal Stress Distribution ◽  
Bonded Joint ◽  
Adhesively Bonded Joint

This paper investigates normal stress distribution of a single-lap adhesively bonded joint under tension using the three-dimensional finite element methods. Five layers of solid elements were used across the adhesive layer thickness in order to obtain an accurate indication of the variation of normal stress. All the numerical results obtained from the finite element analysis show that the spatial distribution of normal stress are similar for different interfaces though the stress values are obviously different. It can also be seen from the results that the left hand region, which is very close to the left free end of the adhesive layer, is subjected to very high stress and the magnitude of the normal stress oscillates in value close to the left end of the adhesive layer.

Effect of the Metal Block on the Stress Distributed in the Adhesively Bonded Single Lap Steel Joint

2013 ◽  
Vol 644 ◽  
pp. 243-246
Author(s):  
Min You ◽  
Lai Hu Song ◽  
Jiang Cheng Zhang ◽  
Mei Li
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Adhesive Layer ◽  
Peak Stress ◽  
Adhesively Bonded ◽  
Steel Joint ◽  
Aluminum Block ◽  
Steel Joints ◽  
Metal Block

The effect of 4 mm long metal block bonded to the end of the overlap zone on the stress distributed in adhesively bonded single lap steel joint was investigated using elasto-plastic finite element method (FEM). The results from the numerical simulation showed that the stress is varied a little when the joints with a couple of 4 mm long metal block adhered to both ends of the over lap or with a couple of adhesive fillet. Compared to the joint without the metal block, it is advantageous of reducing the peak stress in the adhesive layer near the ends of the lap zone in adhesively bonded single lap steel joints but its effect is less than that of the joint with a couple of adhesive fillet. There is no evidential difference in the effects between the steel and aluminum block.

The Analysis of Bonding Shear Stress of Affixed Reinforced RC Beams

2012 ◽  
Vol 599 ◽  
pp. 358-362
Author(s):  
De Sun Yu ◽  
Tian Qin Yu ◽  
Jun Feng Shi
Keyword(s):  
Shear Stress ◽  
Plate Thickness ◽  
Adhesive Layer ◽  
Reinforced Concrete Beams ◽  
Interfacial Stress ◽  
Effective Technique ◽  
Element Analysis ◽  
Factors Affecting ◽  
The Finite Element Analysis ◽  
Two Factors

Bonding a strengthening plate to the tension face is an effective technique to repair reinforced concrete beams; however, much large shear stress along the adhesive line at the plate end will occur. The stress may cause the plate bonded at its end and the strengthened beams fail prematurely. In this paper, the finite element analysis software ANSYS was applied to study the interfacial stress distribution among the adhesive layer. The main factors affecting the peak values of the interfacial stress was also investigated entirely. The effect depends on two factors such as the distance of plate end from the support and plate thickness.

Effect of Recessing Length in Adhesive Layer on the Cleavage Joints

2008 ◽  
Vol 385-387 ◽  
pp. 225-228 ◽  
Author(s):  
Min You ◽  
Zhi Li ◽  
Xiao Ling Zheng ◽  
Zhan Mou Yan
Keyword(s):  
Finite Element Analysis ◽  
Ultimate Load ◽  
Adhesive Layer ◽  
Peak Stress ◽  
Adhesively Bonded ◽  
Left Edge ◽  
Element Analysis ◽  
Cleavage Strength ◽  
Fea Simulation ◽  
The One

The elastic finite element analysis (FEA) and the experimental method of testing the cleavage strength of the joint were used to investigate the effect of the recessing as well as its length on the stress distribution in both the mid-bondline and the adherend near the interface along the bondline of adhesively bonded steel cleavage joint. The results from the FEA simulation showed that the peak values of the stresses distributed in the mid-bondline were nearly the same when the length of the arranged recessing was not greater than 10 mm except that the shear stress Sxy was increased a little when the length of the recessing was increased. For the normal stress Sy near the interface of the joint with a 16 mm length recessing, the peak stress in the adherend is about 49% higher than the one in the adhesive at the left edge of the joint. And it is supported with the results from the experiments that the ultimate load of the steel-to-steel cleavage joint decreased a little when the gap length was less than 10 mm.

The Influence of Suture Density on Bioprosthetic Heart Valve

2013 ◽  
Vol 300-301 ◽  
pp. 1654-1657
Author(s):  
Quan Yuan ◽  
Hai Bo Ma ◽  
Xu Huang
Keyword(s):  
Finite Element ◽  
Heart Valve ◽  
Computer Aided Design ◽  
Dynamic Properties ◽  
Peak Stress ◽  
Bioprosthetic Heart Valve ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Aided Design

This paper constructs the parametric model of the spherical heart valve via computer aided design, a series of accurate parameters of the bioprosthetic heart valve, such as the radius of the sutural ring, height of the supporting stent and inclination of the supporting stent are determined. The finite element method is used to determine the effect of the suture density on the dynamic properties of the bioprosthetic heart valve. The finite element analysis results show that the suture has a significant effect on the dynamic properties of the leaflets. The peak stress with different suture density is quite different and the stress distribution with higher suture density is more reasonable than that with lower suture density. In addition, the suture density has more effect at the top of the attachment edge than the other parts of the valve leaflets. This work is very helpful to manufacture the bioprosthetic heart valve with long term durability.

Sign in / Sign up

Export Citation Format

Share Document