scholarly journals Dynamic Characterization of Single Lap Joints in Composite Laminate over Experimental and Computational Approach

2018 ◽  
Vol 7 (3.12) ◽  
pp. 1062
Author(s):  
J V.Muruga Lal Jeyan ◽  
Akhila Rupesh ◽  
Jency Lal ◽  
. .
Keyword(s):  
Mechanical Characterization ◽  
Lap Joints ◽  
Computational Approach ◽  
Lap Joint ◽  
Dynamic Characterization ◽  
Single Lap Joints ◽  
Load Transmission ◽  
Single Lap Joint ◽  
Hybrid Joints

The purpose of the project investigates the mechanical characterization of single lap joints namely bonded, riveted & hybrid joints an experimentally and numerically. One of the primary entanglements in the investigation of the mechanics of the composite material is the multiphase disappointment conduct. In the meantime, it is hard to describe all the disappointment modes from a solitary situated example. The outcome of the present venture uncovers the way that the mechanical attributes of the half breed single lap joint is enhanced when contrasted and the qualities of adhesively fortified single lap joints in composite cover. The structure comprises of a get together of sub-structures appropriately masterminded and associated with frame a heap transmission way. Such load transmission way is accomplished utilizing joints. Joints constitute the weakest zones in the structure. Along these lines, to use the maximum capacity of composite materials, the quality and stress conveyance in the joints must be seen so reasonable arrangement can be decided for different applications, for example, aviation, car and marine enterprises.  

scholarly journals Characterization of Aluminium Single-Lap Joints for High Temperature Applications

2012 ◽  
Vol 730-732 ◽  
pp. 721-726 ◽  
Author(s):  
Mariana D. Banea ◽  
Lucas F.M. da Silva ◽  
Raul D.S.G. Campilho ◽  
Abílio M.P. de Jesus
Keyword(s):  
Shear Strength ◽  
Design Procedure ◽  
Lap Joints ◽  
Effect Of Temperature ◽  
Lap Joint ◽  
Single Lap Joints ◽  
Single Lap Joint ◽  
Lap Shear ◽  
Failure Loads

In this study, an experimental investigation into the shear strength behaviour of aluminium alloy single-lap adhesive joints was carried out in order to understand the effect of temperature on the strength of adhesively bonding joints. Single lap joints (SLJs) were fabricated and tested at RT and high temperatures (100°C, 125°C, 150°C, 175°C and 200°C). Results showed that the failure loads of the single-lap joint test specimens vary with temperature and this needs to be considered in any design procedure. It is shown that, although the tensile stress decreased with temperature, the lap-shear strength of the adhesive increased with increasing of temperature up to the glass transition of the adhesive (Tg) and decreased for tests above the Tg.

Numerical Study of the Prestressed Connectors and Their Distribution on the Strength of a Single Lap, a Double Lap and Hybrid Joints Subjected to Uniaxial Tensile Test

2013 ◽  
Vol 58 (2) ◽  
pp. 579-585 ◽  
Author(s):  
T. Sadowski ◽  
P. Golewski
Keyword(s):  
Mechanical Response ◽  
Numerical Study ◽  
Lap Joints ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Shear Stresses ◽  
Lap Joint ◽  
Positive Effects ◽  
Single Lap Joint ◽  
Hybrid Joints

Prestressed joints are widely used in construction using connectors in the form of screws, whose task is to strong clamping of joined parts, thereby the internal forces in joint are transferred by surface friction contact of the elements. In the automotive and aerospace industries hybrid joints are more widely applied. Mechanical connectors are added to the adhesive joint in form of rivets, screws or clinch increasing its strength properties. The aim of this study was to determine how the prestressed connectors influence the mechanical response of hybrid, single and double lap joints. The influence of different distribution of the connectors was also investigated. Numerical study was conducted in ABAQUS program. Mechanical connectors were modeled by using fasteners, that allowed for a considerable simplification of the numerical model. In their application, there is no need for an additional submodels for connectors in the form of the rivet or the bolt. Prestressing is activated by direct application of the force to the connector. In the numerical examples the authors assumed that the diameter of the mechanical connectors was equal to 6mm and shear strength was equal 1kN. Adhesive layers were modeled by using cohesive elements for which maximum shear stresses and fracture energy were specified. The layer thickness was assumed to be equal 0.1mm and it was initially removed from the areas where mechanical connectors were placed. Two types of joints were analysed in the study: the single lap joint with lap dimensions 40x40mm as well as the double lap joint with lap dimensions 40x20mm, from which it results that theoretical strength of both connections should be the same. The prestressing of connectors was introduced by the force 1.5kN. For all pure - mechanical joints and for single lap joints positive effects were obtained. For double lap joints additional prestressing did not significantly affect for their strength. The influence of distribution of mechanical connectors was additionally analyzed by consideration of three configurations, where the rows of rivets were located at distances of 5, 10 and 15mm from the lap edge. The maximum increase of the load capacity by 24% was achieved for single lap joint as well as 35.7% for double lap joint. The obtained numerical results indicate the positive effects of additional pressure and allows for practical suggestions how to correct and optimize spacing distance of mechanical connectors in hybrid joints to get better mechanical response.

A Coupled Peel and Shear Stress-Diffusion Model for Adhesively Bonded Single Lap Joints

2017 ◽  
Vol 139 (9) ◽  
Author(s):  
Emad Mazhari ◽  
Sayed A. Nassar
Keyword(s):  
Shear Stress ◽  
Diffusion Model ◽  
Adhesive Layer ◽  
Lap Joints ◽  
Fickian Diffusion ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Single Lap Joints ◽  
Single Lap Joint ◽  
Stress Diffusion

In this study, the Fickian diffusion formulation is extended to the adhesive layer of a single lap joint (SLJ) model, in order to develop a coupled peel and shear stress-diffusion model. Constitutive equations are formulated for shear and peel stresses in terms of adhesive material properties that are time- and location-dependent. Numerical solution is provided for the effect of diffusion on shear and peel stresses distribution. Detailed discussion of the results is presented.

Effect of Recessing in Bondline on Stress in Co-Axial Lap Joint

2010 ◽  
Vol 97-101 ◽  
pp. 952-955
Author(s):  
Xiao Ling Zheng ◽  
Mei Rong Zhao ◽  
Min You ◽  
Zhi Li ◽  
Jia Ling Yan
Keyword(s):  
Finite Element Method ◽  
Aluminum Alloy ◽  
Elastic Modulus ◽  
Middle Part ◽  
Lap Joints ◽  
Lap Joint ◽  
Single Lap Joints ◽  
Single Lap Joint ◽  
Significant Difference ◽  
Peel Stress

The effect of recessing on the stresses distributed along the mid-bondline in both standard single lap joints and co-axial ones were analyzed using elasto-plastic finite element method (FEM). The results obtained show that the values of the peak stresses of all the stresses distributed in the mid-bondline were changed greatly as the preformed angle in over lap zone was about 10 0 when the high elastic modulus adhesive is used. The effect of the elastic modulus level on the stress distribution (especially the peak stresses) is small in the middle part of the lap zone. When taken the stress distributed in the middle part of the lap zone into account, there is nearly no significant difference between the peel stress distributed in the standard joint and co-axial single lap joint when the adhesives with lower elastic modulus was used. It is recommended that a co-axial joint is suitable for the recessing joint made by aluminum alloy and a higher elastic modulus adhesive.

Optimization of Adhesively Bonded Single Lap Joints by Tapering of Adherends

2002 ◽  
Author(s):  
Prasad Nirantar ◽  
Erol Sancaktar
Keyword(s):  
Lap Joints ◽  
Material Behavior ◽  
Experimental Results ◽  
Shear Stresses ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Single Lap Joints ◽  
Single Lap Joint ◽  
Joint Deformation ◽  
Normal And Shear Stresses

The effect of tapering the ends of the adherend on the joint strength and joint deformation behavior of the single lap joint geometry was studied. First, the joints were geometrically modeled using finite element (FE) techniques involving linear, as well as nonlinear (bilinear) material behavior. Then, the FEA results were compared with the experimental results for different configurations of the single lap joints, and the FEA results were found to be consistent with the experimental results with the normal and shear stresses significantly decreasing in the modified geometries over those in unmodified geometries leading to increased loading capacity in modified joints, especially with small-angle taper (~10°).

Multifunctional Adhesive Joints for Composites Using Aligned Carbon Nanotube Nanofoam Films

2008 ◽  
Author(s):  
Vamshi M. Gudapati ◽  
Mehrdad N. Ghasemi-Nejhad
Keyword(s):  
Shear Strength ◽  
Carbon Nanotube ◽  
Mechanical Characterization ◽  
Epoxy Composite ◽  
Adhesive Joints ◽  
Lap Joint ◽  
Single Lap Joint ◽  
Multi Walled Carbon Nanotube ◽  
Average Shear

In this study, the effects of using aligned multi-walled carbon nanotube (MWCNT) nanofoam films as adhesive reinforcements to enhance the shear strength of composite joints are examined. The MWCNT reinforced adhesive nanofoam films are used to bond carbon/epoxy composite adherends. Mechanical characterization of the samples is performed using single lap joint samples to measure average shear strengths experimentally. Shear strength and other multifunctional properties of such nano-adhesives are discussed employing the results obtained in this work.

STRESS DISTRIBUTION OF SECONDARY BENDING IN SINGLE-LAP BOLTED JOINTS WITH DISSIMILAR JOINING PLATES AND PLATE TYPES

2016 ◽  
Vol 78 (5-5) ◽  
Author(s):  
Hilton Ahmad
Keyword(s):  
Fuel Efficiency ◽  
Plate Thickness ◽  
Stress Gradient ◽  
Lap Joints ◽  
Lap Joint ◽  
Single Lap Joints ◽  
Single Lap Joint ◽  
Joint Construction ◽  
Composite Joint ◽  
Composite Steel

Single-lap joints are an important class of bolted joint in the aerospace and civil engineering sectors. This type of joint is preferred as it can reduce weight and hence help to optimize fuel efficiency. However, bolted single-lap joints exhibit secondary bending due to eccentricity of the applied loads. Flexural of plates during tensile loading alters the contact regions in the single-lap joint significantly, resulting in more non-linear behaviour and a stress gradient across the plate thickness. 3-D bolted single-lap joint were modelled in ABAQUS CAE incorporating the effect of the bolt tension from application of a tightening torque. Current 3-D model used elastic properties based on smeared-out properties, the effect of joint construction is considered further by examining the stress in a composite-composite joint and comparing with a composite-steel joint. In a related investigation the effect of varying composite thickness in the composite-steel joints is also studied.  

Modeling of Moisture Diffusion Effect on Peel and Sheer Stresses in Adhesively Bonded Single Lap Joints Under Shear-Tensile Loading

2017 ◽  
Author(s):  
Emad Mazhari ◽  
Sayed A. Nassar
Keyword(s):  
Adhesive Layer ◽  
Moisture Diffusion ◽  
Lap Joints ◽  
Fickian Diffusion ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Adhesive Material ◽  
Single Lap Joints ◽  
Single Lap Joint ◽  
Stress Diffusion

In this study, the Fickian diffusion formulation is extended to the adhesive layer of a single lap joint model, in order to develop a coupled peel and shear stress-diffusion model. Constitutive equation are formulated for shear and peel stresses in terms of adhesive material properties that are time and location-dependent. Numerical solution is provided for the effect of diffusion on shear and peel stresses distribution. Detailed discussion of the results is presented.

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