scholarly journals Hybrid (Bolted/Bonded) Joints Applied to Aeronautic Parts: Analytical One-Dimensional Models of a Single-Lap Joint

2007 ◽  
pp. 95-110 ◽  
Author(s):  
Eric Paroissien ◽  
Marc Sartor ◽  
Jacques Huet
Keyword(s):  
Bonded Joints ◽  
Lap Joint ◽  
One Dimensional ◽  
Single Lap Joint ◽  
Dimensional Models

X-Ray Stress Determination in a Single Lap- Joint Containing a Debonded Region*

1985 ◽  
Vol 29 ◽  
pp. 57-62
Author(s):  
A. Lankford ◽  
C. S. Barrett ◽  
Paul Predecki
Keyword(s):  
Joint Interface ◽  
X Rays ◽  
Bonded Joints ◽  
Lap Joint ◽  
Finite Element Program ◽  
X Ray ◽  
Single Lap Joint ◽  
Element Program ◽  
Adhesive Bonded Joints ◽  
Gain Access

XRD has been found to be a useful technique for investigating both surface and interior stresses in. adhesive bonded joints. For the interior stresses, to gain access to the joint interface, adherends were chosen such that one adherend was relatively transparent to the X-radiation used and the other was not. Incident X-rays then penetrated the first adherend and the adhesive, and were diffracted from just below the surface of the second adherend.In prior work it was shown that the measured stresses due to an applied load agreed quite well with stresses calculated for the same joint using the TEXGAP-2D finite element program, except at one extremity of the bond. One explanation proposed for the discrepancy was that a small debond was present at this extremity. In the present study, therefore, an investigation was made of a joint contfli'nitig an intentional debond at this extremity.

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.

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.

Strength of aluminum single-lap bonded joints in various disbond size at circular and semi-circular notches

2012 ◽  
Vol 14 (6) ◽  
pp. 753-768 ◽  
Author(s):  
Djamel Ouinas
Keyword(s):  
Stress Intensity Factor ◽  
Stress Intensity ◽  
Stress Concentration ◽  
Intensity Factor ◽  
Stress Concentration Factor ◽  
Concentration Factor ◽  
Bonded Joints ◽  
Lap Joint ◽  
Fe Method ◽  
Single Lap Joint

Applications of assembly bonded technique have been extended currently to various industrial fields. Adhesively bonded joints are widely used in the aeronautics and astronautics industry as a result of their high strength and convenience in using the single-lap joint. The geometry of bonded single-lap joint is nonlinear and causes the eccentricity due to the non-collinear applied load, which conducts to a significant stress concentration at the extremities of overlap area, where the cracks may initiate. In this article, the finite element (FE) method is used to analyze the behavior of a bonded lap joint of aluminum adherend. The comparison of stress concentration factor and stress intensity factor of crack emanating from the circular and semi-circular notches are investigated. The single-lap bonded joints were analyzed to study the combined effect of the notch and the disbond as they pertain to joint strength and failure conditions. The results show that the stress concentration factor and stress intensity factor are affected by the negative disbond effect and their values are strongly proportional to its size.

Nondestructive Evaluation of Adhesively Bonded Joints in Graphite/Epoxy Composites Using Acousto-Ultrasonics

1992 ◽  
Vol 114 (3) ◽  
pp. 344-352 ◽  
Author(s):  
S. Tanary ◽  
Y. M. Haddad ◽  
A. Fahr ◽  
S. Lee
Keyword(s):  
Mechanical Performance ◽  
Bonded Joints ◽  
Propagation Characteristics ◽  
Lap Joint ◽  
Adhesively Bonded ◽  
Shear Tests ◽  
Adhesively Bonded Joints ◽  
Testing Conditions ◽  
Single Lap Joint ◽  
Film Adhesive

This paper is concerned with the use of the acousto-ultrasonic technique to evaluate nondestructively the mechanical performance of composite bonded joints. In this context, acousto-ultrasonic measurements followed by destructive shear tests were performed on single lap joint specimens made from graphite/epoxy adherends joined with FM 300 film adhesive. The results indicate a good correlation between acousto-ultransonic wave propagation characteristics and the shear strength of the bonded joints under different testing conditions. These correlations suggest that an estimation of the joint strength can be made by using acousto-ultrasonics provided that the measurement system is calibrated for variations of the material and geometry of the specimen.

Stress Determination in an Adhesive Bonded Joint by X-Ray Diffraction

1983 ◽  
Vol 27 ◽  
pp. 251-260 ◽  
Author(s):  
Paul Predecki ◽  
Charles S. Barrett
Keyword(s):  
X Rays ◽  
Bonded Joints ◽  
Lap Joint ◽  
X Ray Diffraction ◽  
X Ray ◽  
Single Lap Joint ◽  
Structural Applications ◽  
Bonded Joint ◽  
Adhesive Bonded Joints ◽  
Gain Access

At the present time there is considerable interest in the use of adhesive bonded joints for structural applications. The design of such joints is based mostly on finite element calculations and failure tests rather than on strain or stress measurements. To our knowledge no measurements have been made of stresses at or near the adhesive/adherend interface (where many bond failures occur) because of difficulties with accessibility. The purpose of this work was therefore to try to make such measurements using X-ray diffraction.The approach taken was to gain access to the bond by making one of the adherends in a single lap joint to be relatively transparent to X-rays and the cither relatively opaque. Incident X-rays then penetrated the first adherend and the adhesive and were diffracted from gains in the second adherend adjacent to the adhesive/adherend interface. Stresses resulting from curing of the adhesive were determined first, after which a load was applied and the stresses redetermined.

The Effect of Adhesive for Fillet on Stress in Weld-Bonded Joints

2010 ◽  
Vol 450 ◽  
pp. 502-505 ◽  
Author(s):  
Min You ◽  
Jia Ling Yan ◽  
Xiao Ling Zheng ◽  
Nan Feng Xiong ◽  
Ding Feng Zhu
Keyword(s):  
Elastic Modulus ◽  
High Stress ◽  
Bonded Joints ◽  
Longitudinal Stress ◽  
Lap Joint ◽  
Load Bearing Capacity ◽  
High Stress Region ◽  
Single Lap Joint ◽  
Stress Region ◽  
Peak Value

The influence of the fillet with different elastic modulus on the stress distributed in weld-bonded aluminum alloy single lap joint was investigated using elasto-plastic finite element method. The results show that the peak values of the stress along the mid-bondline at the points near the fillet edge were increased as the elastic modulus of the fillet increased. But at points near the both ends of the adherend in over lap zone as well as in the region of the nugget the peak stresses were decreased except longitudinal stress Sx. The peak value of Seqv decreased first, and then it increased again as the elastic modulus in fillet increased. The load-bearing capacity of the whole weld-bonded joints may be improved for the fillet with Adhesive B (825 MPa) for the relative high stress region in nugget was wider and the stress distribution in overlap zone was more uniform.

Sign in / Sign up

Export Citation Format

Share Document