Strength and Finite Element Analysis of Single-Lap Joints With Adhesively Filled Columns

2002 ◽  
Author(s):  
Jiemin Liu ◽  
Songjian He ◽  
Toshiyuki Sawa
Keyword(s):  
Finite Element ◽  
Joint Strength ◽  
Fiber Composite ◽  
Adhesive Layer ◽  
Lap Joints ◽  
Adhesive Joints ◽  
Strength Increase ◽  
Element Analysis ◽  
Single Lap Joints ◽  
Novel Approach

This paper introduces a novel approach to increasing the loading ability of adhesive joints by adding adhesively filled columns. Following procedures are taken for making adhesive joints with adhesively filled columns: At first, holes are drilled at the overlap region of adherends, and then these holes are filled with adhesive or reinforced columns (such as reinforced fiber composite, metal columns, etc.). At the same time, adhesive is also applied on the surfaces of the overlap of adherends. After cured, the reinforced columns and adhesive in the holes form so-called adhesively filled columns. In this study, strengths of single-lap adhesive joints with adhesively filled columns were measured experimentally. Stress and strain distributions at typical positions in adhesive layer were analyzed by using Finite Element Method (FEM). Failure mechanics of the joint were analyzed. It was found that to well-bonded joints, the metal columns make the joint strength increase obviously and the joint strength increases with increasing of adherend thickness. Therefore, using reinforced columns in adhesive joints is an effective approach to generalizing adhesive joints from thin-walled joints to loading sizable bulk ones.

Experimental study and finite element analysis on the joining performance of GF/PP rivets

2020 ◽  
pp. 089270572093914
Author(s):  
Yuan Wang ◽  
Yong Li ◽  
Dajun Huan ◽  
Lisha Li ◽  
Li Liu ◽  
...  
Keyword(s):  
Finite Element ◽  
Tensile Test ◽  
Joint Strength ◽  
Simulation Analysis ◽  
Lap Joints ◽  
Thermoplastic Composite ◽  
Failure Behavior ◽  
Element Analysis ◽  
Single Lap Joints ◽  
Riveted Joints

To improve the performance of thermoplastic composite joints and reduce the weight of joints, glass fiber (GF)/polypropylene (PP) thermoplastic composite rivets (GF/PP rivets) were prepared and tensile test and simulation analysis of GF/PP-riveted single-lap joints were carried out. Based on the tensile test, the optimum extension length of GF/PP rod with different diameters was determined by taking the specific joint strength (the ratio of joint strength to the weight of fasteners) as the evaluation index. The effects of the rivet diameter and the thickness of composite laminates on the specific joint strength and the weight reduction of GF/PP-riveted single-lap joints were studied. The joining mechanism and the failure behavior of GF/PP-riveted joints were analyzed by finite element simulation. The experimental results indicate that the specific joint strength of GF/PP-riveted joints decreased with increasing rivet diameter and laminate thickness. For the same specific joint strength, the weight of fasteners at joints could be reduced by 81.4% and 73.9%, respectively, by using GF/PP rivets instead of steel bolts and aluminum blind rivets. The simulation results show that the change of inclination angle of rivet body would cause the change of failure mode of joints.

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 Strength and Failure Mechanism of Composite-Steel Adhesive Bond Single Lap Joints

2018 ◽  
Vol 2018 ◽  
pp. 1-10
Author(s):  
Kai Wei ◽  
Yiwei Chen ◽  
Maojun Li ◽  
Xujing Yang
Keyword(s):  
Failure Mechanism ◽  
Shear Failure ◽  
Failure Load ◽  
Lap Joints ◽  
Adhesive Joints ◽  
Adhesive Failure ◽  
Interface Failure ◽  
Element Analysis ◽  
Single Lap Joints ◽  
Structural Adhesive

Carbon fiber-reinforced plastics- (CFRP-) steel single lap joints with regard to tensile loading with two levels of adhesives and four levels of overlap lengths were experimentally analyzed and numerically simulated. Both joint strength and failure mechanism were found to be highly dependent on adhesive type and overlap length. Joints with 7779 structural adhesive were more ductile and produced about 2-3 kN higher failure load than MA830 structural adhesive. Failure load with the two adhesives increased about 147 N and 176 N, respectively, with increasing 1 mm of the overlap length. Cohesion failure was observed in both types of adhesive joints. As the overlap length increased, interface failure appeared solely on the edge of the overlap in 7779 adhesive joints. Finite element analysis (FEA) results revealed that peel and shear stress distributions were nonuniform, which were less severe as overlap length increased. Severe stress concentration was observed on the overlap edge, and shear failure of the adhesive was the main reason for the adhesive failure.

Failure analysis of simple overlap bonding joints and numerical investigation of the adhered tip geometry effect on the joint strength

2021 ◽  
Vol 63 (11) ◽  
pp. 1007-1011
Author(s):  
İsmail Saraç
Keyword(s):  
Finite Element Analysis ◽  
Experimental Study ◽  
Finite Element ◽  
Reference Model ◽  
Lap Joints ◽  
Shear Stresses ◽  
Element Analysis ◽  
Single Lap Joints ◽  
Failure Loads ◽  
Previous Experimental Study

Abstract This study was carried out in two stages. In the first step, a numerical study was performed to verify the previous experimental study. In accordance with the previous experimental study data, single lap joints models were created using the ANSYS finite element analysis program. Then, nonlinear stress and failure analyses were performed by applying the failure loads obtained in the experimental study. The maximum stress theory was used to find finite element failure loads of the single lap joints models. As a result of the finite element analysis, an approximate 80 % agreement was found between experimental and numerical results. In the second step of the study, in order to increase the bond strength, different overlap end geometry models were produced and peel and shear stresses in the adhesive layer were compared according to the reference model. As a result of the analyses, significant strength increases were calculated according to the reference model. The strength increase in model 3 and model 5 was found to be 80 % and 67 %, respectively, relative to the reference model.

scholarly journals The Effect of Nanoparticles in Single Lap Joints Studied by Numerical Analyses

2020 ◽  
Vol 5 (10) ◽  
pp. 1288-1293
Author(s):  
Panagiotis J. Charitidis
Keyword(s):  
Finite Element ◽  
Failure Load ◽  
Tensile Loading ◽  
Lap Joints ◽  
Von Mises Stress ◽  
Adhesive Material ◽  
Element Analysis ◽  
Single Lap Joints ◽  
Epoxy Adhesives ◽  
Von Mises

The present study concerns with the finite element investigation of balanced aluminium single lap joints subjected to tensile loading. Epoxy adhesives were used for bonding having different nanoparticles rate in the epoxy resin (0.5, 1.0, 1.5 and to 2 wt. %, respectively). Two-dimensional (2D) finite element analysis has been employed to determine the peeling stress, von Mises stress, and the shear strain distribution across the midplane of the joints. The results mainly prove that the nanoparticles rate in the adhesive material directly affects the joint tensile strength. Nanocomposite adhesives present a higher failure load than that of neat adhesives. Furthermore, nanocomposite adhesive with 0.5 wt. % of nanoparticles generated strengths (shear and peeling strengths) more than neat adhesives, after which decreased by further addition of the nanoparticles.

Effect of Adhesive Behavior on Normal Stress Distributions in the Single-Lap Adhesive Joints

2015 ◽  
Vol 1088 ◽  
pp. 769-773
Author(s):  
Xiao Cong He
Keyword(s):  
Finite Element ◽  
Normal Stress ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Elastic Stiffness ◽  
Adhesive Joints ◽  
Stress Distributions ◽  
Element Analysis ◽  
Element Technique ◽  
Three Dimensional Finite Element

The effect of adhesives behavior on the normal stress distributions of single-lap adhesive joints is investigated using the three-dimensional finite element technique. Numerical examples are provided to show the influence on the normal stresses of the joints using adhesives of different characteristics which encompass the entire spectrum of elastic stiffness behaviour. finite element analysis solutions of the normal stress distributions in the adhesive layer have been obtained for four typical characteristics of adhesives. The results indicate that Young’s modulus and Poisson’s ratios of adhesives strongly affect the normal stress distributions of the joints.

The Research of Adhesively-Bond of Paster Single Lap Joints on Strength Based on ANSYS

2013 ◽  
Vol 785-786 ◽  
pp. 1236-1239
Author(s):  
Yu Qi Wang ◽  
Xiao Cong He ◽  
Bao Ying Xing ◽  
Sen Zhou
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Adhesive Bond ◽  
Lap Joints ◽  
Adhesive Joints ◽  
Single Lap Joints ◽  
Strength Based ◽  
Strength Of Adhesive Joints ◽  
Element Method

The adhesive-bond of paster single lap joints was put forward firstly. The strength of 5052Al-Al adhesive-bond of single lap joints (SLJ) and 5052Al-Al paster adhesive-bond of SLJ were investigated using finite element method (FEM). Results from the simulation showed that the paster adhesive-bond of SLJ was stronger than the adhesive-bond of SJL. So it can use the paster adhesive joints to improve the strength of adhesive joints.

Selective Use of Rubber Toughening to Optimize Lap-Joint Strength

1999 ◽  
Author(s):  
Erol Sancaktar ◽  
Sumeet Kumar
Keyword(s):  
Finite Element ◽  
Joint Strength ◽  
Lap Joints ◽  
Finite Element Models ◽  
Lap Joint ◽  
Bulk Properties ◽  
Rubber Toughening ◽  
Novel Approach ◽  
Rubber Toughened ◽  
Third Stage

Abstract This paper introduces a novel approach to increasing the lap joint strength, different than the traditional methods of either increasing the lap joint area or changing the joint geometry. This is accomplished by the selective use of rubber toughening in epoxy to optimize lap joint strength. This was accomplished in three stages, in the first stage an adduct was prepared, this was used to make bulk tensile specimens to calculate the bulk properties for various concentrations of rubber, i.e. 0, 10 & 20 parts per hundred parts of resin (epoxy). In the second stage finite element models were developed using the bulk properties previously obtained. Interfacial stresses were used to access the trends obtained by the selective use of rubber toughening at different location of the overlap in different configurations. The modeling of adhesive joints was done using ALGOR 2-D, linear and nonlinear Finite Element Analyses (FEA). In the third stage, conducting tensile shear tests on the lap joints validated the trends from the finite element models. Finite element modeling and meshing of the lap joints having 25.4 mm and 50.8 mm adhesive overlap lengths were completed. Different configurations of rubber toughened and untoughened adhesive were tried in these two overlaps. The validation was done by tensile lap joint tests conducted on an Instron mechanical tester coupled with an extensometer. Comparable strengths were obtained for completely toughened overlap and the configuration where only the edges of the adhesive overlap were toughened and the region in-between was untoughened. Also, the nonlinear FEA was shown to represent the experimental results more closely than the linear approach.

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