An improved 2D finite element model for bolt load distribution analysis of composite multi-bolt single-lap joints

2020 ◽  
Vol 253 ◽  
pp. 112770
Author(s):  
Fengrui Liu ◽  
Wanting Yao ◽  
Libin Zhao ◽  
Hao Wu ◽  
Xi Zhang ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Load Distribution ◽  
Element Model ◽  
Lap Joints ◽  
Distribution Analysis ◽  
Single Lap Joints

An Experimental and Numerical Analysis of Riveted Single Lap Joints

1994 ◽  
Vol 208 (2) ◽  
pp. 79-90 ◽  
Author(s):  
C-P Fung ◽  
J Smart
Keyword(s):  
Finite Element ◽  
Stress Concentration ◽  
Three Dimensional ◽  
Element Model ◽  
Lap Joints ◽  
Published Data ◽  
Single Lap Joints ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Stress Patterns

Countersunk and snap riveted single lap joints have been examined both experimentally and numerically. A total of 11 specimens were fatigued to failure with failures occurring in either the plate or the rive***r. The failures have been metallurgically examined to determine the cause of failure. The joints have also been analysed using the finite element method. Initially a single lap joint has been modelled as a ‘stepped plate’ and the results for the stress concentration factor found to be in reasonable agreement with published data. However, the stress concentration for this joint occurred at a point away from the point of failure of a riveted joint. A fuller three-dimensional finite element model has been constructed and the stress patterns around the rivet determined. These stress patterns are discussed in relation to the results from the metallurgical examination.

Effects of missing fasteners on the mechanical behavior of double-lap, multi-row composite bolted joints

2018 ◽  
Vol 52 (28) ◽  
pp. 3919-3933
Author(s):  
Fujian Zhuang ◽  
Puhui Chen
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Load Distribution ◽  
Mechanical Characteristics ◽  
Joint Stiffness ◽  
Element Model ◽  
Bolted Joints ◽  
Explicit Finite Element ◽  
Single Column ◽  
Failure Loads

This paper presents a numerical investigation into the effects of missing fasteners on the mechanical characteristics of double-lap, multi-row composite bolted joints. A highly efficient explicit finite element model, which was validated effective and accurate by experiments, was developed and employed to conduct the virtual tests. Single-column and multi-column joints with various positions of missing fastener were considered. It is shown that the removal of fasteners can reduce the joint stiffness significantly, especially in joints with fewer columns or missing fasteners in the outside rows. The removal of fasteners can also cause considerable reductions in both the initial significant failure loads and ultimate loads of multi-column joints, while in single-column joints only the initial significant failure loads are influenced. Considering the load distribution, it is suggested that bolts in the same column as or in the adjacent column to the missing fastener experience a notable growth in load. Meanwhile, if a bolt bears more loads in the pristine joint, the larger changes in stiffness, ultimate strength, and load distribution may be obtained when it is lost.

scholarly journals Effect of Riveting Angle and Direction on Fatigue Performance of Riveted Lap Joints

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 236
Author(s):  
Qingxiao Liang ◽  
Tianpeng Zhang ◽  
Chunrun Zhu ◽  
Yunbo Bi
Keyword(s):  
Finite Element ◽  
Stress Distribution ◽  
Finite Element Model ◽  
Three Dimensional ◽  
Element Model ◽  
Fatigue Tests ◽  
Lap Joints ◽  
Fatigue Performance ◽  
Riveting Process ◽  
Three Dimensional Finite Element

Riveting is the most commonly used connection method in aircraft assembly, and its quality has a crucial effect on the fatigue performance of aircraft. Many factors affect the riveting quality, among which the influence of the riveting angle and direction is not clear. In this paper, a three-dimensional finite element model of single-rivet lap joints is established and verified by the driven head geometry and the riveting force data obtained from the riveting experiments. Then, by adjusting the angle and direction of the punch in the finite element model, the riveting process is simulated at the angles of 0°, 1°, 2°, and 3° and the directions of 0° and 180° to investigate the deformation of the lap joints, the stress distribution around the hole, and the stress distribution of the rivet. Finally, the fatigue tests of the single-rivet lap joints are performed and the influence of the riveting angle and direction on the connection quality and fatigue performance of the riveting joints is analyzed.

A Simplified Finite Element Riveted Lap Joint Model in Structural Dynamic Analysis

2014 ◽  
Vol 1016 ◽  
pp. 185-191
Author(s):  
Marco Daniel Malheiro Dourado ◽  
José Filipe Bizarro de Meireles
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Dynamic Analysis ◽  
Numerical Models ◽  
Element Model ◽  
Lap Joints ◽  
Mode Shapes ◽  
Lap Joint ◽  
Structural Dynamic ◽  
Riveted Lap Joints

This paper proposes a simplified finite element model to represent a riveted lap joint in structural dynamic analysis field. The rivet is modeled byspring-damperelements. Several numerical models are studied with different quantities of rivets (1, 3 and 5) andspring-damperelements (4, 6, 8, 12, 16 and 20) per rivet. In parallel, samples of two aluminum material plates connected by different quantities of rivets (1, 3 and 5) are built and tested in order to be known its modal characteristics – natural frequencies and mode shapes. The purpose of the different settings is to get the best numerical riveted lap joint representation relatively to the experimental one. For this purpose a finite element model updating methodology is used. An evaluation of the best numerical riveted lap joint is carried out based on comparisons between the numerical model after updating and the experimental one. It is shown that the riveted lap joints composed by eight and twelvespring-damperelements per rivet have the best representation. A stiffness constant valuekis obtained for the riveted lap joints in study.

Study on the Pin-Load Distribution of Multiple-Bolted Composite to Metal Joints

2012 ◽  
Vol 525-526 ◽  
pp. 285-288 ◽  
Author(s):  
Xiang Dong Liu ◽  
Ya Zhi Li ◽  
Zhen Hua Yao ◽  
Huai Shu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Strain Measurement ◽  
Load Distribution ◽  
Lap Joints ◽  
Strain Gages ◽  
Element Analysis ◽  
Single Lap Joints ◽  
Sheet Surface ◽  
The Finite Element Analysis

The experiment and finite element analysis were made to determine the pin-load distribution of multiple countersunk bolted single-lap joints. In the experiment, the pin-load fractions were evaluated indirectly by the lap-sheet surface strains collected from a few rows of strain gages. The joint strains and pin-load distribution were also obtained directly in the finite element analysis. The calculated strains correlated well with the experiment. Nevertheless, the pin-load fraction results of the both techniques are quite different. The further analysis revealed that the procedure of transforming the measured strains into pin loads is not reliable, since the intrinsic additional bending had not been taken into account. Therefore the appropriate way to determine the pin-load distribution should be the numerical analysis validated by the strain measurement. The another attempt showed that the pin-load distribution can be evaluated by the finite element modeling of two-dimensional shells and beams as well with satisfied accuracy.

Changes of Load Distribution on Cup-Bone Interface at the Different Positions of Non-Cemented Acetabular Cup

2014 ◽  
Vol 510 ◽  
pp. 297-301
Author(s):  
Dong Song Li ◽  
Shu Qiang Li ◽  
Bo Cai ◽  
Wei Feng ◽  
Jian Guo Liu
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Load Distribution ◽  
Shear Force ◽  
Element Model ◽  
Abduction Angle ◽  
3D Measurement ◽  
Acetabular Cup ◽  
3D Finite Element ◽  
Cup Position

Objective To explore the relationship between acetabular cup position and the load distribution within the acetabulum and to confirm an optimal range of cup position, thereby providing a theoretical criterion from a biomechanical aspect for proper cup implantation in clinical work. Methods A male adult cadaveric pelvic was scanned with spiral CT, and then the two-dimensional images were evaluated using GE medical systems software and the outline of the pelvis was identified by the edge detective estimation. Pelvic coordinate data were put into the computer to build up a three-dimensional (3D) finite element model of the pelvic using Solidworks software . A φ48 non-cemented cup from Tianjin Huabei Medical Instrument Factory was used, and the 3D measurement of the cup was carried out by CLY single-arm 3D measurement apparatus, which was made in Testing Technology Institute of China. The measurement data were transferred into computer. Through the CAD Sliod Works 2010 software, the 3D model of the cup was automatically reconstructed. After wards, one-foot standing position was simulated to conduct the loading and constraint of the model, the Mises and shear force distributing of the cup were analyzed, forecasting the mechanical risk of prosthetic failure. Results In the 3D finite element model of human pelvis, the number of total nodes was 103043 and the number of total elements was 69271. Abduction angle did not affect the Mises and shear force distributions between the range of 40°-50°(P>0.05). However, significant affects appeared in Mises and shear force once the abduction angle was < 35° or > 50°. The change of the cup anteversion within5°-30°would not affect the Mises and shear forces in the acetabulum (P > 0.05). Conclusion A uniform load distribution on the cup-bone interface can be obtained when the cup abduction angle is from 40°to 50°. The change of the cup anteversion angle can not affect the load distribution in the acetabulum, therefore the cup abduction range of 40°-50°can be confirmed as the safe range for cup implantation.

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