Theoretical Study on Stress State in Adhesive Layer of Single Lap Joint under Eccentric Tensile Load

2010 ◽  
Vol 97-101 ◽  
pp. 3944-3947
Author(s):  
Chun Liang Li ◽  
Jia Zhou
Keyword(s):  
Stress State ◽  
Theoretical Study ◽  
Tensile Load ◽  
Adhesive Layer ◽  
Arbitrary Point ◽  
Calculation Model ◽  
Bond Stress ◽  
Lap Joint ◽  
Single Lap Joint ◽  
Stress States

The paper put forward the way to calculate the bond stress state in adhesive layer of single lap joint under eccentric tensile load. And based on elastic theory to establish the calculation model of the stress state in adhesive layer of single lap joint under eccentric tensile load. According to the calculation model, the real stress state at the arbitrary point in adhesive layer can be calculated accurately. At the time, the resultes of the bond stress states of different length and width of single lap joint are analyzed and compared.

The Effect of Fillet Geometry on Stress in Weld-Bonded Joints

2010 ◽  
Vol 97-101 ◽  
pp. 767-770 ◽  
Author(s):  
Jia Ling Yan ◽  
Min You ◽  
Xiao Ling Zheng ◽  
Ding Feng Zhu ◽  
Mei Rong Zhao
Keyword(s):  
Finite Element Method ◽  
Stress Distribution ◽  
Adhesive Layer ◽  
Bonded Joints ◽  
Lap Joint ◽  
Load Bearing Capacity ◽  
Single Lap Joint ◽  
Reducing Stress ◽  
Peak Value ◽  
Alloy Weld

The influence of fillets with different geometry shape on the stress distribution in aluminum alloy weld-bonded single lap joint was investigated using elasto-plastic finite element method (FEM). The results show that it is advantageous of reducing stress concentration in adhesive layer near the ends of the lap zone in single lap weld-bonded aluminum joints and part of the stress transferring from adhesive layer to the nugget when the joints with a couple of right triangle fillets over other shapes. The load-bearing capacity of the whole weld-bonded joints may be improved. The full-triangular fillet is recommended that it be more advantageous of decreasing the stress peak value and making the stress distribution in overlap zone more uniform.

Viscoelastic Analysis of Adhesively Bonded Double – Lap Joint

2007 ◽  
Vol 345-346 ◽  
pp. 1473-1476
Author(s):  
Sang Soon Lee
Keyword(s):  
Room Temperature ◽  
Viscoelastic Model ◽  
Tensile Load ◽  
Adhesive Layer ◽  
Lap Joint ◽  
Epoxy System ◽  
Adhesively Bonded ◽  
Viscoelastic Analysis ◽  
Edge Cracks ◽  
Local Yielding

In this paper, stress distribution in a double lap joint subjected to a tensile load is investigated using the boundary element method. The adhesive used in this study is a commercial epoxy system which can be cured at room temperature. The adhesive is assumed to be linearly viscoelastic. The order of the singularity is obtained numerically for a given viscoelastic model. The numerical results show that interface stresses are large enough to initiate local yielding or edge cracks. Since the exceedingly large stresses cannot be borne by the adhesive layer, edge cracks can occur at the interface corner.

On the Performance of Single-Lap Bonded Joints with Embedded Optical Fibers

2015 ◽  
Vol 732 ◽  
pp. 305-308
Author(s):  
Milan Dvořák ◽  
Milan Růžička
Keyword(s):  
Mechanical Properties ◽  
Shear Strength ◽  
Optical Fibers ◽  
Adhesive Layer ◽  
Adhesive Joints ◽  
Bonded Joints ◽  
Lap Joint ◽  
Single Lap Joint ◽  
Life Tests ◽  
Statistical Analysis Methods

This article describes experimental research on properties of adhesive joints with embedded optical fibers. The objective was to determine whether fibers may cause a reduction of mechanical properties of joints. Specimens with single-lap joint for tensile test were made with various configurations of optical fibers in an adhesive layer. Shear strength and fatigue life tests were performed and results were evaluated using the statistical analysis methods.

Effect of Alkali on the Impact Toughness of Adhesively Bonded Joints

2012 ◽  
Vol 166-169 ◽  
pp. 1904-1907
Author(s):  
Min You ◽  
Chun Zhi Mei ◽  
Wen Jun Liu ◽  
Jing Rong Hu ◽  
Ling Wu
Keyword(s):  
Impact Toughness ◽  
Moisture Absorption ◽  
Adhesive Layer ◽  
Epoxy Adhesive ◽  
Alkali Solution ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Single Lap Joint ◽  
The Impact

The effect of the temperature and immersed time of the alkali solution on the impact toughness of the adhesively bonded steel single lap joint under impact loading is studied using the experimental method. The results obtained show that the impact toughness of the specimen increased when the immersed time increased then it decreased as it beyond 3 days. When the immersed time is longer than 72 h, the higher the temperature is, the lower the impact toughness of the joint. The moisture absorption of the adhesive layer with the immersed time was also investigated and it was found that there is a relationship to the impact toughness of the adhesively bonded single lap joint. The epoxy adhesive layer was analyzed with FT-IR and it was found that the hydroxyl enhanced and bonding strength may increase after 72 h immersed in alkali solution.

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.

Free Asymmetric Vibrations of Composite Full Circular Cylindrical Shells With a Bonded Central Lap Joint

2003 ◽  
Author(s):  
V. O¨zerciyes ◽  
U. Yuceoglu
Keyword(s):  
Cylindrical Shell ◽  
Differential Equations ◽  
Shell Theory ◽  
Natural Frequencies ◽  
Cylindrical Shells ◽  
Adhesive Layer ◽  
Lap Joint ◽  
First Order ◽  
Single Lap Joint ◽  
Circular Cylindrical Shells

In this study, the problem of the free asymmetric vibrations of composite “full” circular cylindrical shells with a bonded single lap joint is considered. The “full” circular cylindrical shell adherends to be made of dissimilar and orthotropic materials are connected by relatively very thin, yet flexible and linearly elastic adhesive layer. The bonded single lap joint is a centrally located in the composite shell system. The analysis is based on a “Timoshenko-Mindlin (and Reissner) Type Shell Theory” which is a “First Order Shear Deformation Shell Theory (FSDST)”. In the formulation, the set of governing differential equations is reduced to a system of first order ordinary differential equations in the “state vector” form. Then, they are integrated by means of a numerical procedure, that is, the “Modified Transfer Matrix Method (with Chebyshev Polynomials)”. The mode shapes and the natural frequencies of the “full” cylindrical shell lap joint system are investigated for various boundary conditions. Also, the effects, on the modes and natural frequencies, of the “hard” (or rather relatively stiff) and the “soft” (or relatively very flexible) adhesive layer cases are considered and presented. Some of the numerical results of the important parametric studies are computed and plotted.

Effects of Loading Speed and Shear Prestrain on Adhesive Fatigue Strength in Single-Lap Joint

2007 ◽  
Vol 340-341 ◽  
pp. 1479-1484 ◽  
Author(s):  
Michihiro Takiguchi ◽  
Fusahito Yoshida
Keyword(s):  
Fatigue Strength ◽  
Low Cycle Fatigue ◽  
Adhesive Layer ◽  
Fatigue Tests ◽  
Strain Accumulation ◽  
Cycle Fatigue ◽  
Lap Joint ◽  
Final Fracture ◽  
Single Lap Joint ◽  
Lap Shear

The adhesive fatigue strength was investigated by performing repeated tensile lap shear experiments of an aluminum single-lap joint bonded with highly ductile acrylic adhesive. In load-controlled fatigue tests, progressive transverse shear deformation of the adhesive layer took place, and it led to the final fracture of the joint. The fatigue strength becomes higher with increasing loading speed, especially at low-cycle fatigue region. From experiments on shear-prestrained specimens, it was found that the prestrain does not affect so much the fatigue life. In order to discuss the behavior of progressive shear strain accumulation (viscoplastic ratcheting) of adhesive under cyclic loading, the numerical simulation of ratcheting was conducted using a constitutive model of elasto-viscoplasticity for the adhesive.

Sign in / Sign up

Export Citation Format

Share Document