Investigation of Riveting Parameters Influence on the Riveted Joints Deformation During Slug Rivet Installation

2016 ◽  
Author(s):  
Zhengping Chang ◽  
Zhongqi Wang ◽  
Jinming Zhang ◽  
Yuan Yang ◽  
Yonggang Kang
Keyword(s):  
Rise Time ◽  
Dwell Time ◽  
Fem Simulation ◽  
Dimensional Accuracy ◽  
Quantitative Model ◽  
Fe Model ◽  
Clamping Force ◽  
Orthogonal Experiments ◽  
Riveted Joints ◽  
Slug Rivet

Slug rivet is widely used in aircraft assembly due to the higher interference fit level and the longer fatigue life. However, the inhomogeneity of riveting interference value along the thickness direction of the aircraft panels always leads to inevitable deformation, which significantly degrades the dimensional accuracy of the final products. In this study, a quantitative model is established to describe the relationship between several riveting parameters (i.e. squeezing force, buck cavity, upsetting rise time, upsetting dwell time and clamping force between sheets) and the deformation of a formed slug rivet joint. Then the coefficient of variance (CV) is introduced to evaluate the homogeneity of deformation. Subsequently, an optimized combination of the presented parameters is obtained by using finite element method (FEM) simulation so as to generate more uniform deformation. Finally, the FEM model is validated by a series of orthogonal experiments conducted in G86 fully automated C-frame riveting machine and the results show that the squeezing force and the buck cavity are the main significant factors and contributors to the riveted joints deformation, and the sequence of this effect from the high to low are: upsetting dwell time, clamping force, and upsetting rise time. The results also indicate that the developed FE model can be used for further analysis, including the prediction of large component riveting deformation and the mechanical properties of riveted joint.

scholarly journals Experimental Study on the Riveted Joints in Glass Fibre Reinforced Plastics (GFRP)

2017 ◽  
Vol 64 (3) ◽  
pp. 301-313 ◽  
Author(s):  
Radosław Bielawski ◽  
Michał Kowalik ◽  
Karol Suprynowicz ◽  
Witold Rządkowski ◽  
Paweł Pyrzanowski
Keyword(s):  
Finite Element Method ◽  
Experimental Study ◽  
Finite Element ◽  
Measurement Methods ◽  
Image Correlation ◽  
Clamping Force ◽  
Reinforced Plastics ◽  
Riveted Joints ◽  
Glass Fibre Reinforced ◽  
Glass Fibre Reinforced Plastics

Abstract The aim of the paper is to validate the use of measurement methods in the study of GFRP joints. A number of tests were carried out by means of a tensile machine. The studies were concerned with rivet connection of composite materials. One performed two series of tests for two different forces and two fibre orientations. Using Finite Element Method (FEM) and Digital Image Correlation (DIC), strain maps in the test samples were defined. The results obtained with both methods were analysed and compared. The destructive force was analysed and, with the use of a strain gauge, the clamping force in a plane parallel to the annihilated sample was estimated. Destruction processes were evaluated and models of destruction were made for this type of materials taking into account their connections, such as riveting.

Finite Element Analysis of Metal Flow of Finishing Groove in Hot Continuous Rolling Bar

2012 ◽  
Vol 510 ◽  
pp. 667-672
Author(s):  
Jia Lin Zhou ◽  
Chen Gang Pan ◽  
Xiao Yong Zhang
Keyword(s):  
Strain Distribution ◽  
Metal Flow ◽  
Dimensional Accuracy ◽  
Stress And Strain ◽  
Fe Model ◽  
Element Analysis ◽  
Iron And Steel ◽  
Expansion Angle ◽  
The Stability ◽  
Stress And Strain Distribution

This article established 3D FE model of dual-radius arc finishing groove and tangent expansion angle finishing groove using ANSYS / LS-DYNA software for Wuhan Iron and Steel plant Ф16 hot continuous bar, and analyzed metal flow pattern, stress and strain distribution of two types finishing grooves. The results show that surface stress and strain distribution of dual-radius arc finishing groove have better uniform than them of tangent expansion angle finishing groove, and dual-radius arc finishing groove ensures the stability of the rolled piece in finishing groove, improve the dimensional accuracy and surface quality of rolled finishing product.

Recent Advances in Dry-Bag Cip Equipment

2007 ◽  
Vol 534-536 ◽  
pp. 1625-1628 ◽  
Author(s):  
Yoshikazu Kishi ◽  
Yasuhide Miyashita ◽  
Yasuo Manabe ◽  
Takao Fujikawa
Keyword(s):  
Fem Simulation ◽  
Dimensional Accuracy ◽  
Research Results ◽  
High Productivity ◽  
Higher Dimensional ◽  
Powder Flowability ◽  
Volume Production ◽  
Powder Compacts ◽  
Line Type ◽  
Selection Of

Dry-bag CIP process has become a very popular method in the large volume production of powder compacts in the P/M and ceramic industries. Intensive technological research on the Drybag equipment has been carried out to improve the dimensional accuracy and the productivity. In this study, the rubber mold design technology with FEM simulation during pressing has been introduced, in order to achieve higher dimensional preciseness, and criteria for the selection of Drybag equipment, namely the In-line type or Off-line type, have been established based on the powder flowability index proposed by Carr. Based on these research results, high productivity Off-line Drybag CIP equipment, which can realize good dimensional accuracy with high productivity, was developed even for non granulated powders with poor packing density. This paper describes the research results and the present status of the most advanced Off-line Dry-bag CIP equipment technologies.

Effect of Inter-Layer Dwell Time on Distortion and Residual Stresses of Laser Metal Deposited Wall

2019 ◽  
Vol 822 ◽  
pp. 445-451
Author(s):  
Sergei Yu. Ivanov ◽  
Artur Vildanov ◽  
Pavel A. Golovin ◽  
Antoni Artinov ◽  
Ivan Karpov
Keyword(s):  
Stress Distribution ◽  
Yield Strength ◽  
Dwell Time ◽  
Local Heating ◽  
Dimensional Accuracy ◽  
Free Edge ◽  
Substrate Material ◽  
Metal Deposition ◽  
Laser Metal Deposition ◽  
Aisi 316

The laser metal deposition is an advanced manufacturing technology enabling the production of large-sized parts and partially or completely elimination of machining and welding. The process is characterised by a non-uniform local heating of the buildup leading to a stress distribution, which may exceed the yield strength of the material and leads to loss of dimensional accuracy. The interlayer dwell time has a strong influence on the temperature field. The effect of the interlayer dwell time on the distortion and the stress distribution during laser metal deposition of a single-pass wall on the edge of 2 mm thick plate was studied experimentally and numerically. The deposited material was IN625 and the substrate material was AISI 316. A decrease of the residual displacement, due to a uniform shrinkage after the deposition of the last layer and a lower level of the residual compressive longitudinal plastic strain, has been observed in the studies without a dwell time. The peak increment of the free edge displacement corresponds to the first layer and hence the subsequent layers will be deposited on the already plastically deformed buildup. The tensile residual longitudinal stress near the top of the buildup and transverse stress near the edges of the buildup is higher than yield strength in the studies with dwell time.

Effect of Process Routing on Machining Deformation for Multi-Frame Double Sided Monolithic Components

2010 ◽  
Vol 97-101 ◽  
pp. 2894-2897 ◽  
Author(s):  
Zhi Tao Tang ◽  
Zhan Qiang Liu ◽  
Li Qiang Xu
Keyword(s):  
Finite Element ◽  
Residual Stresses ◽  
Coordinate Measuring Machine ◽  
Element Model ◽  
Fe Model ◽  
Clamping Force ◽  
Optimal Process ◽  
Machining Deformation ◽  
Measuring Machine ◽  
Monolithic Components

When machining aerospace monolithic components, a severe deformation can be observed due to the release and redistribution of the original residual stresses, together with the action of cutting loads and clamping force. In this paper, a finite element model predicting machining deformation was developed considering the above mentioned multi-factors coupling effects. Based on the model, the effect of process routing on machining deformation for multi-frame double sided monolithic components was studied. To validate the FE model, true frame components were machined and deformations were measured on a Coordinate Measuring Machine. The result revealed that the prediction model is credible. At last the paper puts forwards optimal process routing based on minimizing the machining deformation.

Analysis of Diametrical Error of Machined Workpieces in Ultrasonic Vibration Assisted Turning

2011 ◽  
Vol 264-265 ◽  
pp. 1079-1084 ◽  
Author(s):  
H. Soleimanimehr ◽  
Mohammad Javad Nategh ◽  
Saeed Amini
Keyword(s):  
Ultrasonic Vibration ◽  
Cutting Tool ◽  
Fem Simulation ◽  
Glass Ceramics ◽  
Dimensional Accuracy ◽  
Work Piece ◽  
Spring Back ◽  
Dimensional Error ◽  
Machining Force ◽  
Advanced Machining

The elastic compliance of a work-piece under machining forces during machining operation and its subsequent spring back causes dimensional error. This phenomenon is more critical in turning process especially when long work-pieces are machined between chuck and center or between centers. Ultrasonic vibration assisted turning (UAT) where the cutting tool is put into an ultrasonicfrequency vibration during the ordinary cutting process leads to considerable improvement of the machined work-piece including increase in the dimensional accuracy. This is partly attributable to the noticeable decrease of the machining force in UAT compared with those occurring in conventional turning (CT). It is noteworthy that UAT is regarded as an advanced machining technique which is especially suitable for machining of brittle and hard-to-cut materials such as glass, ceramics and super alloys. In the present study, the diametrical error due to the spring back of work-piece being machined between chuck and center in turning operation is first analyzed. A model is then presented for prediction of this error in UAT by statistical analysis of extant experimental results. All influencing parameters are thus taken into consideration when deriving the predicting model. This model is verified by FEM simulation.

Dynamics Modeling and Analysis of Riveted Mainframe Computer Structure

2017 ◽  
Author(s):  
Budy Notohardjono ◽  
Richard Ecker ◽  
Shawn Canfield
Keyword(s):  
Test Data ◽  
Dominant Mode ◽  
Mode Shapes ◽  
Dynamic Mode ◽  
Fe Model ◽  
Dynamics Modeling ◽  
Actual Structure ◽  
Beam Elements ◽  
Mainframe Computer ◽  
Riveted Joints

A typical mainframe computer rack is narrow, tall and long. In certain installations, during its functional operation, the server can be subjected to earthquake events. The rack is a steel structure joined together with steel rivets. One of the rack’s functions is to protect the critical components such as the processor, input-output and storage drawers from excessive motion by minimizing the amount of deflection. The riveted joints pose a challenge in accurately representing more than three thousand joints in a finite element (FE) model. In the FE model, bonding together sheet metal regions around the rivet joints will lead to a significantly stiffer model than the actual structure. On the other hand, an accurate representation of the riveted joints will lead to a better representation of the dynamic response of the server rack under vertical and horizontal loadings. This paper presents a method of analyzing rivet joints. The rivet joints are represented by beam elements with cylindrical cross-sections in the FE model. This is accomplished by identifying two parallel or overlapping plates and inserting discrete beam elements at the riveted joint. This method will be used to predict the dynamics modes of the structure. To validate the FE model, a prototype server rack was subjected to side to side vibration tests. A sine sweep vibration test identifies dominant mode shapes and the transmissibility of the input vibration. The results of the tests on the prototype rack serve as input for FE model refinement. The test data show that representing the riveted joints with beams does provide results that closely match the actual test data. A validated FE model will be used to evaluate dominant vibration modes for several configurations of rack weight as well as configurations to stiffen the structure in the side to side direction. The dynamic mode shapes visualize the effect of stiffening brackets on dominant frequencies of the rack. The optimal stiffening design will be the one that results in the minimum deflection under the standard testing profile.

Quality Analysis of Friction Stir Welded Butt Joints by Means of Experiments and Simulations

2012 ◽  
Vol 504-506 ◽  
pp. 759-764 ◽  
Author(s):  
Gianluca D'Urso ◽  
Michela Longo ◽  
Claudio Giardini ◽  
Elisabetta Ceretti
Keyword(s):  
Structural Characteristics ◽  
Three Dimensional ◽  
Fem Simulation ◽  
Welding Process ◽  
Quality Analysis ◽  
Mechanical Resistance ◽  
Fe Model ◽  
Softening Effect ◽  
Friction Stir ◽  
Set Up

Friction Stir Welding (FSW) is a solid-state welding process introduced and developed in last decades. In this process a rotating tool is pressed on the two parts to be welded (mainly two plates), driven into the material and then translated along the parts interface. Academic and industrial interest is focused on the characteristics of the joined part in terms of mechanical resistance and fatigue resistance of the joints. These characteristics are heavily related to the process parameters chosen since the material stirring and the material temperature greatly depend on the pin rotating and translating speed. In fact, the stirring phenomena and the friction acting between the shoulder of the pin and the sheets, greatly increase the part temperature so that the material greatly changes its structural characteristics due to softening effect: grain dimensions, local hardness, grain orientation. Moreover, due to the physical material movement different types of defects (mainly voids) can be present in the welded zone (nugget). In particular three different areas can be identified: the heat affected zone (HAZ), the thermo-mechanical affect zone (TMAZ) and the nugget. The extension and the characteristics of these zone are very important in order to define the joint quality. These investigations are very important especially when FSW is applied in industrial fields such as aerospace, automotive and naval. To cut and to investigate an experimentally obtained joint is interesting for understanding the weld quality, but FEM simulation of the process can add very useful information in defining how the process parameter influence the joint behaviour and the three different zone extensions. As an example the heat flux, and consequently the temperature distribution inside the material, depend on the combination of rotation and welding speeds. For this reason, in the last years several efforts were oriented to the numerical simulation of the process, in order to investigate thermo-mechanical aspects, stress and strain distributions, thermal flow, residual stresses. The present paper deals with the set up of a FE model for the simulation of the FSW process whose results are correlated with the experimental observations carried out when joining AA6060-T6 aluminium alloy plates 5mm thick with a cylindrical tool with flat shoulder. The experimental campaign was performed under different welding conditions varying the tool rotational speed and the welding speed. A three-dimensional piezoelectric load cell was used to measure the welding forces in the main directions. The numerical model was developed and set up in DEFORM 3D environment. The information obtained from the model helped in the understanding of the welding phenomena.

scholarly journals Local Phenomena During Riveting Process

2014 ◽  
Vol 2013 (5) ◽  
pp. 66-78
Author(s):  
Jerzy Kaniowski ◽  
Wojciech Wronicz
Keyword(s):  
Fatigue Life ◽  
Numerical Study ◽  
Numerical Models ◽  
Stress System ◽  
Strain Effect ◽  
Fe Model ◽  
Force Increase ◽  
Riveted Joints ◽  
Riveting Process ◽  
Strain Signal

Abstract The paper presents experimental and numerical study of the local phenomena during the riveting process. It is commonly accepted that technological factors of the riveting process has a strong influence on the fatigue life of riveted joints. The authors analysed the papers concerned the experimental researches of the riveting force influence on fatigue life. The magnitude of the life increase caused by the riveting force increase suggests the authors that this is not only the result of beneficial stress system but the change of the joint formation mechanism has taken place. This was an inspiration to undertake more detailed researches of the riveting process. The strain progress during the riveting process has been experimentally investigated for four types of aluminium rivets used in airframes. Measurements confirm very high strains near the driven head. For some types of rivets the reversal strain signal has been recorded. Several FE model has been use to investigate the riveting process. The axisymmetric and solid models were used. The agreement of experimental and numerical results in some cases were good, in other cases the numerical models demand further development. In any calculations, the reversal strain effect has not been obtained, This suggest that it is result of the phenomenon which has not been taken into account in numerical modelling. The working hypothesis has been assumed that during the riveting process adhesive joints (called cold welding) were formed and destroyed during the process, what was the reason of the observed reversal strain signal. The authors are going to continue this investigation.

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