Analysis of the Stress Distribution in Adhesive Joints and Optimisation of the Design of Hybrid Bonded Assemblies

2009 ◽  
pp. 223-246
Author(s):  
J.Y. Cognard ◽  
R. Créac'hcadec ◽  
L. Sohier
Keyword(s):  
Stress Distribution ◽  
Adhesive Joints

Shear Stress Discontinuities in Adhesive Joints

2015 ◽  
Vol 1088 ◽  
pp. 758-762
Author(s):  
Xiao Cong He
Keyword(s):  
Shear Stress ◽  
Stress Concentration ◽  
Stress Distribution ◽  
Three Dimensional ◽  
Adhesive Layer ◽  
Adhesive Joints ◽  
Shear Stress Distribution ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This paper deals with the stress discontinuities in shear stress distribution of adhesive joints. The three-dimensional finite element analysis (FEA) software was used to model the joints and predict the shear stress distribution along the whole beam. The FEA results indicated that there are stress discontinuities existing in the shear stress distribution within adhesive layer and adherends at the lower interface and the upper interface of the boded section. The numerical values of the shear stress concentration at key locations of the joints and the stress concentration ratio are discussed.

Stress Analysis of Combination Joints of Adhesive With Tap Bolt Under External Tensile Loads

2002 ◽  
Author(s):  
Toshiyuki Sawa ◽  
Akira Moriuchi
Keyword(s):  
Finite Element Method ◽  
Plastic Deformation ◽  
Stress Distribution ◽  
Adhesive Joints ◽  
Bolted Joints ◽  
Strain Gauges ◽  
Screw Thread ◽  
Clamping Force ◽  
Stress Distributions ◽  
Bolted Joint

The stress distributions in a combination joint of an adhesive with a tap bolt under external tensile loadings are analyzed in elasto-plastic deformation using a finite element method. The FEM code employed is MARC. The effects of the initial clamping force (preload), external loadings and the position of engagement screw thread on the interface stress distributions are analyzed. In addition, the stress distribution in the combination joints of the adhesive with the tap bolt is compared with that in tap bolted joint without an adhesive and the adhesive joints without the tap bolt. As the results, it is found that the stress distribution (compression) in the combination joint is less than that of bolt joints. In addition, the experiments were carried out to measure the strain of the combination joint under external tensile loads using strain gauges. Furthermore, the joint strengths under external loadings were measured. Fairly good agreements are observed between the numerical and the measured results. In addition, the usefulness of the combination joints is demonstrated in comparison with the bolted joints and the adhesive joints.

scholarly journals Improvement of fatigue life of riveted joints in helicopter airframes

2021 ◽  
Vol 23 (1) ◽  
pp. 167-175
Author(s):  
Marek Rośkowicz ◽  
Jan Godzimirski ◽  
Michał Jasztal ◽  
Jarosław Gąsior
Keyword(s):  
Aluminum Alloy ◽  
Fatigue Life ◽  
Stress Distribution ◽  
Lap Joints ◽  
Adhesive Joints ◽  
Test Results ◽  
Threefold Increase ◽  
Riveted Joints ◽  
Hybrid Joints ◽  
Better Than

Using original cold-formed rivets in repairs of airframes of helicopters is difficult due to no access to inside parts of the airframe. Thus, the main aim of the study was to investigate the possibility to use the blind rivets or hybrid joints by verification the fatigue performance of such joints that must be better than with original rivets. Riveted and hybrid joints have been experimentally tested under static and fatigue loads. Furthermore, numerical calculations of stress distribution for strapped joint have been conducted. The test results covered fatigue life of lap joints and models of repaired airframe sheets using ordinary mushroom head rivets ref. 3558A-4-10, titanium driven blind bolts with pin, ref. MBF2110AB-05-150 and modified hybrid joints. Using titanium driven blind bolts with pin instead of ordinary hammer-bucked rivets, can improve the fatigue life of element made of aluminum alloy AW 2024T3. There are advantages of replacing riveted joints with modified hybrid (rivet & adhesive) joints in threefold increase in fatigue life of repaired airframe structures.

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