Comparisons of Finite Element Models of Bonded Bonded Joints

2011 ◽  
Vol 66-68 ◽  
pp. 2192-2197 ◽  
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element ◽  
Adhesive Layer ◽  
Finite Element Models ◽  
Bonded Joints ◽  
Reduced Integration ◽  
Hybrid Formulation

Thispaperdealswithcomparisonsoffiniteelementmodelsofadhesivelybondedjoints. Inordertoincreasetheaccuracyoftheresults,fivelayersofsolidelementswereusedacrossthe adhesivelayerwhichwasonly0.05mminthickness.Thefiniteelementswererefinedgraduallyin steps from adherends to adhesive layer. In these models, most regions of the adherends and adhesiveweremodelledusingsolidbrickelementsbutsomesolidtriangularprismelementswere usedforasmoothtransition.Insomeofthemodels,linearinterpolationelementsoffullorreduced integrationandofhybridformulationwereused.Inothermodels,quadraticinterpolationelements of full or reduced integration and of hybrid formulation were used. Comparisons are performed betweenmodelswithdifferentmodellingapproachinordertofindasuitablemodeltopredictthe mechanicalbehaviourofadhesivelybondedjoints.

scholarly journals Numerical Studies on Mechanical Behavior of Adhesive Joints

2015 ◽  
Vol 2015 ◽  
pp. 1-13 ◽  
Author(s):  
Xiaocong He ◽  
Yue Zhang
Keyword(s):  
Mechanical Behavior ◽  
Adhesive Layer ◽  
Linear Interpolation ◽  
Adhesive Joints ◽  
Smooth Transition ◽  
Triangular Prism ◽  
Suitable Model ◽  
Reduced Integration ◽  
Hybrid Formulation ◽  
Quadratic Interpolation

This paper describes some finite element models for analyzing the mechanical behavior of adhesive joints. In these models five layers of solid elements were used across the adhesive layer in order to increase the accuracy of the results. The finite elements were refined gradually in steps from adherends to adhesive layer. In these models, most of the adherends and adhesive were modeled using solid brick elements but some solid triangular prism elements were used for a smooth transition. In some of the models, linear interpolation elements of full or reduced integration and of hybrid formulation were used. In other models, quadratic interpolation elements of full or reduced integration and of hybrid formulation were used. Comparisons are drawn between models with different modeling approaches as well as different types of element combinations in order to find a suitable model to predict the behavior of adhesive joints.

Stress Analysis of Bonded Joint Using Solid Element Combinations

2013 ◽  
Vol 467 ◽  
pp. 332-337
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element ◽  
Mechanical Behaviour ◽  
Adhesive Layer ◽  
Smooth Transition ◽  
Triangular Prism ◽  
Suitable Model ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Bonded Joint

This paper describes some finite element combinations to analyse the mechanical behaviour of bonded joints. In finite element models five layers of solid elements were used across the adhesive layer in order to increase the accuracy of the results. The finite elements were refined gradually in steps from adherends to adhesive layer. In these models, most of the adherends and adhesive were modeled using solid brick elements but some solid triangular prism elements were used for a smooth transition. Comparisons are performed between different types of first-order element combinations in order to find a suitable model to predict the mechanical behaviour of adhesively bonded joints.

Computational Approach for Adhesively Bonded Composite Joints

2000 ◽  
Author(s):  
Iqbal Anwar ◽  
Golam Newaz
Keyword(s):  
Finite Element ◽  
Adhesive Layer ◽  
Limit Load ◽  
Element Model ◽  
Composite Joints ◽  
Bonded Joints ◽  
Failure Model ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Nodal Failure

Abstract A computational intensive study was performed to assess an efficient way to model adhesively bonded glass fiber reinforced composite joints in automotive applications. Three different finite element modeling techniques had been implemented. First, adhesive was represented by 1D-spring elements. Spring stiffness was calculated from adhesive property. This model is inadequate to assess stresses developed in the adhesive layer directly. So adhesive was modeled with 2D elements for better assessment of state of stress in the adhesive and the substrate. Both the model provide limit load, but crack initiation and failure of the bond can not be captured. The third approach adopted was the nodal failure model. In the nodal failure model, to understand the failure of adhesively bonded joints, bond strength had been specified to the interface nodes of the composite substrate. Combined failure criteria had been used. Cracks propagated and interface debonded when interface stress exceeded the failure limit. Finite element model results compared well with the experimental data. This modeling approach was later adopted for dynamic modeling of adhesively bonded joints, which shows promise.

Effect of Adhesive Layer’s Voids on Stress Distribution of Adhesively Bonded Joints

2010 ◽  
Vol 139-141 ◽  
pp. 986-989 ◽  
Author(s):  
Hai Long Zhao ◽  
Zong Zhan Gao ◽  
Zhu Feng Yue ◽  
Zhi Feng Jiang
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Adhesive Layer ◽  
Shear Loading ◽  
Lap Joints ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Single Lap Joints

The stress distribution of adhesively-bonded single lap joints under tensile shear loading is analyzed using 2-dimensional elastic-plastic finite element method (FEM). Special attentions have been put on the influence of void in adhesive on the stress distribution of adhesively-bonded joints. The results show that the stress concentration of the void is less than that of the end part of the joints when adhesive layer’s deformation was in the range of elastic. Moreover, the influence of the void on the stress distribution becomes less when the void moving from the end-part to the middle. The stress concentration becomes larger and the stress distribution of adhesive’s mid-thickness region becomes flatter when adhesive layer has biggish plastic deformation. Finite element results show an agreement with the theoretical results.

Efficient Stress Analysis of Adhesively Bonded Joints by Finite Element Techniques

2006 ◽  
Author(s):  
Davide Castagnetti ◽  
Eugenio Dragoni
Keyword(s):  
Finite Element ◽  
Stress Analysis ◽  
Plane Stress ◽  
Single Layer ◽  
Adhesive Layer ◽  
Element Model ◽  
Analytical Models ◽  
Bonded Joints ◽  
Ongoing Research ◽  
Strength Assessment

The paper documents ongoing research on the field of stress calculations in the adhesive layer of bonded joints and bonded structures. Aim of the research is to develop simple, general, portable, efficient and accurate finite element techniques for adhesive stress analysis and strength assessment of the joint. Among four methods envisioned, two methods are presented for 2D configurations and applied to a reference single-lap configuration. In both methods, the adherends are described by means of beam elements and the adhesive layer by a single string of plane-stress solid elements. The plane-stress elements have either the original thickness of the true adhesive layer or an expanded thickness up to the offset between adherends. Beams and plane-stress elements are connected by standard constraining techniques (tied mesh) offered by the package employed (ABAQUS). The stress results provided by the two methods are compared step by step with the predictions of analytical models retrieved from the literature and with the outcome of a full, computationally-intensive finite element model using solid plane-stress elements for both adhesive and adherends. The simplified method using a single layer of plane-stress elements with the same thickness and properties as the true adhesive layer provides very promising results in terms of stress accuracy and computational efficiency.

Sign in / Sign up

Export Citation Format

Share Document