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.  

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°).

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.

scholarly journals Single Lap Joints Numerical Modelling and Comparison with Experimental Testing

2018 ◽  
Vol 2 (1) ◽  
pp. 11-20 ◽  
Author(s):  
Daniel F. O. Braga ◽  
Lucas F. M. Da Silva ◽  
Pedro M. G. P. Moreira
Keyword(s):  
Structural Design ◽  
Adhesive Bonding ◽  
Experimental Testing ◽  
Lap Joints ◽  
Lap Joint ◽  
Joint Configuration ◽  
Single Lap Joints ◽  
Single Lap Joint ◽  
Different Types ◽  
Structural Adhesive

Adhesive bonding is a joining technique which has been extensively employed in structural design as its ability to join different types of materials allows higher freedom for designers when choosing materials. One of the most common joint configuration used is the single lap joint configuration. In this work a set of experimental procedures were undertaken to characterize a structural adhesive and model the behaviour of a single lap joint manufactured using this adhesive. Two types of surface preparations were used to study its effect in single lap joint strength.

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.  

Numerical Analysis of Co-Cured Composite Single Lap Joint with Spew Fillets

2011 ◽  
Vol 279 ◽  
pp. 219-223
Author(s):  
Guo Hua Zhao ◽  
Qing Lian Shu ◽  
Bo Sheng Huang
Keyword(s):  
Finite Element ◽  
Tensile Load ◽  
Lap Joints ◽  
Finite Element Code ◽  
Lap Joint ◽  
Single Lap Joints ◽  
Single Lap Joint ◽  
Static Tensile ◽  
The Subject ◽  
Failure Location

Spew fillet is common in co-cured composite single lap joint. It plays an important role in the safety of the joint. But few attentions were paid to the subject in former investigations. In this paper, co-cured composite single lap joints with spew fillets under static tensile load were investigated numerically using the commercial finite element code ANSYS. The submodeling technique was employed to overcome the problem caused by extra aspect ratio of elements. The computation results indicated that the existence of spew fillets will not change the possible failure location, but will improve the anti-failure performance of single lap joint.

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.

Effect of interface non-flatness on the fatigue behavior of adhesively bonded single lap joints

2017 ◽  
Vol 233 (7) ◽  
pp. 1277-1286 ◽  
Author(s):  
SMJ Razavi ◽  
MR Ayatollahi ◽  
M Samari ◽  
LFM da Silva
Keyword(s):  
Fatigue Life ◽  
Bearing Capacity ◽  
Fatigue Behavior ◽  
Fatigue Loading ◽  
Lap Joints ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Load Bearing Capacity ◽  
Load Bearing ◽  
Single Lap Joints

This paper addresses numerical and experimental examination of the role of zigzag interface shapes on the load bearing capacity and fatigue life of adhesively bonded single lap joints. Aluminum adherends with non-flat zigzag interfaces were tested under both quasi-static and fatigue loading conditions. The quasi-static test results revealed that the non-flat adhesive joints have higher load bearing capacity compared to the conventional flat single lap joints. Comparative fatigue tests with different loading levels revealed that the non-flat zigzag single lap joint had considerably higher fatigue life than the conventional lap joint.

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