The Strength Analysis of Adhesive Joints of Pipe Lines in Deep Sea Environment by FEM

2014 ◽  
Author(s):  
Yu Zhang ◽  
Gui Chu ◽  
Pei Zhen Wu ◽  
Meng Lan Duan
Keyword(s):  
Adhesive Joint ◽  
Deep Sea ◽  
External Pressure ◽  
Adhesive Joints ◽  
Strength Analysis ◽  
Singular Stress ◽  
Element Analysis ◽  
Offshore Pipelines ◽  
Adhesive Thickness ◽  
Pipe Lines

Considering the adhesive joint widely used in industry, and its successful use in repairing systems in offshore pipelines, its application for pipe lines in deep sea is proposed. As pipe lines underwater are subjected to tension, bending, internal and external pressure, and adhesive joints have the singular stress fields at the end of interfaces of different materials, adhesive joints of pipes lines are the weakest parts in term of strength. This research studied the strength of adhesive joints of pipe lines under tension, bending, internal and external pressure, and the combination of these loadings using finite element analysis. It was determined that the adhesive joints of pipe lines are more prone to failure along the adhesive-pipe interface under bending compared to other loadings. Moreover, the effects of adhesive thickness and cover length on the strength of adhesive joint are investigated in this paper.

scholarly journals Failure Analysis on a Collapsed Flat Cover of an Adjustable Ballast Tank Used in Deep-Sea Submersibles

2019 ◽  
Vol 9 (23) ◽  
pp. 5258
Author(s):  
Fang Wang ◽  
Mian Wu ◽  
Genqi Tian ◽  
Zhe Jiang ◽  
Shun Zhang ◽  
...  
Keyword(s):  
Deep Sea ◽  
Material Selection ◽  
High Strength ◽  
External Pressure ◽  
Element Analysis ◽  
Ballast Tank ◽  
Material Inhomogeneity ◽  
Comprehensive Properties ◽  
Ultimate Cause ◽  
Flat Cover

A flat cover of an adjustable ballast tank made of high-strength maraging steel used in deep-sea submersibles collapsed during the loading process of external pressure in the high-pressure chamber. The pressure was high, which was the trigger of the collapse, but still considerably below the design limit of the adjustable ballast tank. The failure may have been caused by material properties that may be defective, the possible stress concentration resulting from design/processing, or inappropriate installation method. The present paper focuses on the visual inspections of the material inhomogeneity, ultimate cause of the collapse of the flat cover in pressure testing, and finite element analysis. Special attention is paid to the toughness characteristics of the material. The present study demonstrates the importance of material selection for engineering components based on the comprehensive properties of the materials.

scholarly journals Strength analysis of adhesive joints of riser pipes in deep sea environment loadings

2013 ◽  
Vol 1 (1) ◽  
pp. 9 ◽  
Author(s):  
Yu Zhang ◽  
Tai Qin ◽  
Nao Noda ◽  
Meng Duan
Keyword(s):  
Deep Sea ◽  
Adhesive Joints ◽  
Strength Analysis

Effect of Adhesive Thickness and Bonding Length on Behavior of Composite Adhesive Joints Subject to Torsion

2007 ◽  
Vol 124-126 ◽  
pp. 1313-1316
Author(s):  
Je Hoon Oh
Keyword(s):  
Finite Element Analysis ◽  
Thermal Stresses ◽  
Failure Modes ◽  
Adhesive Joints ◽  
Design Parameters ◽  
Stress Distributions ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Adhesive Thickness ◽  
Bonding Length

Combined thermal and mechanical analyses were used to investigate the effect of joint design parameters such as the adhesive thickness and bonding length on stress distributions and torque capacities of tubular adhesive joints with composite adherends. The finite element analysis was employed to calculate the residual thermal stresses due to fabrication, and the mechanical stresses were analyzed using the nonlinear analysis of tubular adhesive joints. The analyses reveal that the stacking angle, adhesive thickness and bonding length have a significant influence on residual thermal stresses, and consequently failure modes and joint strengths.

A Study on Evaluation of Impact Strength of Adhesive Joints Subjected to Impact Shear Loadings

2008 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Toshimasa Nagai ◽  
Takeshi Iwamoto ◽  
Hideaki Kuramoto
Keyword(s):  
Impact Strength ◽  
Adhesive Joint ◽  
Static Loading ◽  
Split Hopkinson Pressure Bar ◽  
Shear Loading ◽  
Adhesive Joints ◽  
Stress Distributions ◽  
Adhesive Thickness ◽  
The Impact ◽  
Strength Of Adhesive Joints

Adhesive joints in mechanical structures are subjected to static loading as well as impact loading. It is desired for the adhesive joints to have sufficient strength under both static and impact loadings. A lot of studies on the adhesive joints and the joint strength subjected to static loading have been carried out and examined. A few research works on the adhesive joint subjected to dynamic loading have been done, however, it has not fully elucidated for applying the joints to important sections in mechanical structures. In this study, the impact strength of adhesive joints subjected to impact shear loading is investigated using modified split Hopkinson pressure bar (SHPB) apparatus. The shear strength of adhesive joint, in which a solid cylinder is bonded to a hollow cylinder by an adhesive, is determined from maximum applied shear stress. A commercial thermosetting epoxy adhesive is used in the experiments. At the same time, the stress distributions in the joints subjected to impact shear loading are simulated by the finite-element analyses (FEA). The effect of adhesive thickness is investigated experimentally and computationally. It is shown that the strength is greatly affected by the adhesive thickness and the effect on the stress distributions in the joint is discussed.

Effect of Supports on Stress Distributions in the Adhesive Joints

2011 ◽  
Vol 130-134 ◽  
pp. 1495-1498 ◽  
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Adhesive Joints ◽  
Element Analysis ◽  
Accurate Indication ◽  
Dimensional Finite Element ◽  
Centre Region ◽  
Adhesive Thickness ◽  
Three Dimensional Finite Element

The aim of this paper is to investigate the effect of supports on the actual stress distribution of the single-lap adhesive joints under tension using the three-dimensional finite element methods. Five layers of elements were used across the adhesive thickness in order to obtain an accurate indication of the variation of stresses. All the numerical results obtained from the finite element analysis show that the spatial distribution of all components of stress are similar for different interfaces though the stress values are obviously different. The results also show that most of the maximum stresses occur at the interface 1. It can be seen from the results that the stresses are concentrated near the left free ends of the adhesive layer while the centre region of the adhesive layer is mostly stress-free.

Effect of Parameters on Strength of Composites Single-Lap Adhesive Joints

2012 ◽  
Vol 490-495 ◽  
pp. 2250-2253
Author(s):  
Yin Huan Yang
Keyword(s):  
Finite Element ◽  
Shear Stress ◽  
Numerical Study ◽  
Maximum Shear Stress ◽  
Adhesive Layer ◽  
Adhesive Joints ◽  
Element Analysis ◽  
Adhesive Thickness ◽  
The Times ◽  
Peel Stress

Based on popular and maturate application of the finite element analysis method, a numerical study is presented for effect of parameters, that are composed of lap length, adhesive thickness and ply styles of adherend, on maximum peel/shear stress of T700/EXOPY composite single-lap adhesive joints in this paper. Finite element simulations are carried out to analyze the peel/shear stress fields along the interfaces between the adhesive and the adherends. The simulation results show that the joint maximum peel/shear stress decreases with increasing the lap length, and peel stress of the joint of adherends of ply style [0/90/±45/0]S is much less, and the maximum shear stress in the interfaces between the adhesive layer and the adherends do not dcreases all the times with increasing the adhesive thickness. Good agreements between the present simulations and the experimental results are found.

Fatigue Performance of Hybrid Adhesive Dissimilar Joint

2015 ◽  
Vol 786 ◽  
pp. 48-52 ◽  
Author(s):  
Ku Hafizan ◽  
Mohd Afendi ◽  
A. Logashanmugam
Keyword(s):  
Fatigue Life ◽  
Stress Reduction ◽  
Adhesive Joint ◽  
High Performance ◽  
Research Study ◽  
Epoxy Adhesive ◽  
Adhesive Joints ◽  
Fatigue Performance ◽  
Stainless Steel 304 ◽  
Adhesive Thickness

A research study on the fatigue performance of hybrid adhesive joints was carried out to investigate the fatigue performance of adhesive joint and hybrid adhesive joint using dissimilar material. A 3 mm thin plate of aluminium A7075 and stainless steel 304 are used as the adherend material for experimental test and the adhesive used was high performance Araldite epoxy adhesive. Maximum fatigue life was achieved for the hybrid adhesive joint with an optimum overlap length of 59 mm and the adhesive thickness of 0.2 mm. The fatigue damaged occurs on the adherend surface for adhesive joint and adherend crack for hybrid adhesive joint. Results showed an increment of fatigue life with shear stress reduction.

Finite Element Modeling of the Geometry Size Effect for Adhesive Joints Strength

2010 ◽  
Vol 129-131 ◽  
pp. 1212-1216
Author(s):  
Chao Lu ◽  
Mei Ling Xia
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Size Effect ◽  
Finite Element Modeling ◽  
Adhesive Joint ◽  
Joint Strength ◽  
Adhesive Joints ◽  
Adhesive Thickness ◽  
Overlap Area

Based on 3D elastic-plastic finite element method (FEM), the geometry size effect on strength in aluminum alloy adhesive joints is presented in this paper. The numerical and experimental results show that with the adhesive thickness increased, the adhesive joint strength first increases then decreases, and in a certain range, with the adhesive thickness increased, the adhesive joint strength is nonlinear to the overlap length but linear to the overlap area. In the case of the same overlap area, the adhesive joint strength can be increased by increasing overlap length and decreasing overlap width.

Bond Thickness Effects upon Dynamic Behaviour in Adhesive Joints

2010 ◽  
Vol 97-101 ◽  
pp. 3920-3923 ◽  
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Dynamic Behaviour ◽  
Adhesive Layer ◽  
Adhesive Joints ◽  
Response Functions ◽  
Frequency Range ◽  
Element Analysis ◽  
Cantilevered Beam ◽  
Different Thickness

The influence of adhesive layer thickness on the dynamic behaviour of the single-lap adhesive joints is investigated in this paper. The ABAQUS finite element analysis (FEA) software was used to predict the frequency response functions (FRFs) of the single-lap adhesive joints of different thickness of the adhesive layer. As a reference, the FRFs of a cantilevered beam without joint were investigated as well. It is clear that the FRFs of the four beams are close to each other within the frequency range 0~1000 Hz. It is also found that the composite damping of the single-lap adhesive joint increases as the thickness of the adhesive layer increases.

scholarly journals Apparent Young’s Modulus of the Adhesive in Numerical Modeling of Adhesive Joints

Materials ◽  
2021 ◽  
Vol 14 (2) ◽  
pp. 328
Author(s):  
Kamil Anasiewicz ◽  
Józef Kuczmaszewski
Keyword(s):  
Numerical Model ◽  
Young’S Modulus ◽  
Adhesive Joint ◽  
Young's Modulus ◽  
Precise Determination ◽  
Adhesive Joints ◽  
Experimental Conditions ◽  
Element Simulation ◽  
Joint Material

This article is an evaluation of the phenomena occurring in adhesive joints during curing and their consequences. Considering changes in the values of Young’s modulus distributed along the joint thickness, and potential changes in adhesive strength in the cured state, the use of a numerical model may make it possible to improve finite element simulation effects and bring their results closer to experimental data. The results of a tensile test of a double overlap adhesive joint sample, performed using an extensometer, are presented. This test allowed for the precise determination of the shear modulus G of the cured adhesive under experimental conditions. Then, on the basis of the research carried out so far, a numerical model was built, taking the differences observed in the properties of the joint material into account. The stress distribution in a three-zone adhesive joint was analyzed in comparison to the standard numerical model in which the adhesive in the joint was treated as isotropic. It is proposed that a joint model with three-zones, differing in the Young’s modulus values, is more accurate for mapping the experimental results.

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