Modelling the load–slip behaviour of timber joints with mechanical fasteners

1991 ◽  
Vol 18 (4) ◽  
pp. 607-616 ◽  
Author(s):  
M. A. Erki
Keyword(s):  
Finite Element ◽  
Joint Interface ◽  
Limit States ◽  
Finite Element Approximations ◽  
Axial Tension ◽  
Interface Characteristics ◽  
Model Predictions ◽  
Dimensional Finite Element ◽  
Timber Joints ◽  
Good Agreement

An analytical model of behaviour is presented, which uses one-dimensional finite element approximations to predict the short-term load – slip response of a single fastener joint. The model treats the elastoplastic behaviour of the fastener as well as the nonlinear, nonelastic properties of the wood. It accounts for some of the distinctive behaviour of timber joints such as fastener withdrawal, rotational restraint at the fastener ends, joint interface characteristics, and combined fastener bending and axial tension. Good agreement is obtained between model predictions and test behaviour for single fastener glulam rivet, nail, and bolt joints. The model can be adapted to include the variability in wood and fastener properties, and can be incorporated into a large number of computer simulations in order to predict the fifth fractiles of the populations of joint resistances, which can be used in a limit states design approach. Key words: timber structures, glulam rivet connections, nailed connections, bolted connections, mathematical model, finite element, nonlinear analysis.

Step Coverage Modeling of Thin Films Deposited by CVD Using Finite Element Method

1991 ◽  
Vol 250 ◽  
Author(s):  
Ching-Yi Tsai ◽  
Seshu B. Desu
Keyword(s):  
Finite Element ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Element Model ◽  
Number Ratio ◽  
Step Coverage ◽  
Model Predictions ◽  
Dimensional Finite Element ◽  
Deposition Processes ◽  
Good Agreement

AbstractA two—dimensional finite element model was developed to study the step coverage of submicron trenches with arbitrary shape under chemical vapor deposition processes. Parameters that characterize the step coverage were found to be the surface Damkohler number, ratio of diffusion coefficients inside and outside of the trench, and aspect ratio of the trench geometry. Efforts were concentrated on studying the step coverage of SiO2 film deposited from SiH4/O2 precursors within rectangular shape trenches. The model predictions were found to be in good agreement with reported experimental results.

Rigid-Plastic Impact of Single Angular Particles

2021 ◽  
Author(s):  
Sandeep Dhar
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Orientation Dependence ◽  
Particle Orientation ◽  
Rigid Plastic ◽  
Plastic Model ◽  
Model Predictions ◽  
Good Agreement ◽  
Angular Particles

The trajectory of an angular particle as it cuts a ductile target is, in general, complicated because of its dependence not only on particle shape, but also on particle orientation at the initial instant of impact. This orientation dependence has also made experimental measurement of impact parameters of single angular particles very difficult, resulting in a relatively small amount of available experimental data in the literature. The current work is focused on obtaining measurements of particle kinematics for comparison to rigid plastic model developed by Papini and Spelt. Fundamental mechanisms of material removal are identified, and measurements of rebound parameters and corresponding crater dimensions of single hardened steel particles launched against flat aluminium alloy targets are presented. Also a 2-D finite element model is developed and a dynamic analysis is performed to predict the erosion mechanism. Overall, a good agreement was found among the experimental results, rigid-plastic model predictions and finite element model predictions.

Residual Stress Prediction for Non-Axisymmetric Vessel Penetration Welds

2008 ◽  
Author(s):  
Kazuo Ogawa ◽  
Nobuyoshi Yanagida ◽  
Koichi Saito
Keyword(s):  
Residual Stress ◽  
Finite Element ◽  
Three Dimensional ◽  
Measurement Data ◽  
Fe Model ◽  
Stress Distributions ◽  
Dimensional Finite Element ◽  
Stress Prediction ◽  
Three Dimensional Finite Element ◽  
Good Agreement

Residual stress distribution in an oblique nozzle jointed to a vessel with J-groove welds was analyzed using a three-dimensional finite element method. All welding passes were considered in a 180-degree finite element (FE) model with symmetry. Temperature and stress were modeled for simultaneous bead laying. To determine residual stress distributions at the welds experimentally, a mock-up specimen was manufactured. The analytical results show good agreement with the experimental measurement data, indicating that FE modeling is valid.

Effects of Materials on Formation of Double-Layered Liners Shaped Charges

2009 ◽  
Vol 79-82 ◽  
pp. 1277-1280
Author(s):  
Yu Zheng ◽  
Xiao Ming Wang ◽  
Wen Bin Li ◽  
Wen Jin Yao
Keyword(s):  
Numerical Simulation ◽  
Finite Element ◽  
Numerical Simulations ◽  
Double Layer ◽  
Two Dimensional ◽  
Materials Properties ◽  
X Ray ◽  
Dimensional Finite Element ◽  
Simulation Results ◽  
Good Agreement

In order to study the effects of liner materials on the formation of Shaped Charges with Double Layer Liners (SCDLL) into tandem Explosively Formed Projectile (EFP), the formation mechanism of DLSCL was studied. Utilizing two-dimensional finite element dynamic code AUTODYN, the numerical simulations on the mechanical phenomenon of SCDLL forming into tandem EFP were carried out. X-ray pictures were obtained after Experiments on SCDLL. Comparisons between experimental results and numerical simulation results have good agreement. It can be concluded from the results that the materials properties and configurations of both liners are crucial to the formation of tandem EFP.

Finite Element Model of a Heated Wire Catalyst in Cross Flow

2008 ◽  
Author(s):  
Katie Leichliter ◽  
Bob Lounsbury ◽  
Judi Steciak ◽  
Ralph Budwig ◽  
Steve Beyerlein
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Cross Flow ◽  
Element Model ◽  
Trailing Edges ◽  
Dimensional Finite Element ◽  
Fuel Mixtures ◽  
Three Dimensional Finite Element ◽  
Calculated Average ◽  
Good Agreement

Experimentally obtained temperatures of a heated coiled platinum wire in low Reynolds Number cross-flow were compared with a three-dimensional finite element (finite volume) model. The calculated average wire temperature was in good agreement with experimentally obtained values with deviations close to experimental uncertainty bounds at temperatures between 530K and 815K. The model predicted a temperature variation along each coil, with the lowest temperatures along the leading edges of the coil and the higher temperatures at the trailing edges. The rate of heat generated at the wire surface from catalytic reactions was found for the ignition of lean propane/oxygen/nitrogen mixtures. We studied the coiled catalytic wire as part of our efforts to ignite very lean homogeneous air-fuel mixtures in transportation engines under conditions approaching Homogeneous Charge Compression Ignition (HCCI).

Stress analysis of adhesive-bonded lap joints

1974 ◽  
Vol 9 (3) ◽  
pp. 185-196 ◽  
Author(s):  
R D Adams ◽  
N A Peppiatt
Keyword(s):  
Finite Element ◽  
Adhesive Layer ◽  
Lap Joints ◽  
Elastic Behaviour ◽  
Lap Joint ◽  
Linear Elastic ◽  
Rubber Model ◽  
Dimensional Finite Element ◽  
Linear Elastic Behaviour ◽  
Good Agreement

Stresses in a standard metal-to-metal adhesive-bonded lap joint are analysed by a two-dimensional finite-element method and comparisons are made with previous analyses. Particular attention is paid to the stresses at the ends of the adhesive layer. Unlike previous work, which assumes the adhesive to have a square edge, the adhesive spew is treated as a triangular fillet. The highest stresses exist at the adherend corner within the spew. Linear elastic behaviour is assumed throughout. A rubber model is reported which confirms these results physically. Good agreement was also obtained between some practical results and the finite-element predictions.

Three-Dimensional Finite Element Analysis on Open-Die Block Forging Design

1992 ◽  
Vol 114 (4) ◽  
pp. 459-464 ◽  
Author(s):  
Chinghua Hung ◽  
Shiro Kobayashi
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Rigid Plastic ◽  
Flat Bottom ◽  
Element Analysis ◽  
Dimensional Finite Element ◽  
Die Set ◽  
Cylindrical Workpiece ◽  
Three Dimensional Finite Element ◽  
Good Agreement

Three-dimensional rigid-plastic finite element method was used to analyze the practice of open-die block forging, focusing on the effects of die configurations and forging pass designs. Four combinations of die configurations were investigated: conventional flat dies, top flat/bottom V-shaped dies, and double V-shaped dies with 120 and 135 deg included angles. Two different pass designs, 90 and 180 deg rotation angles between succeeding passes, were applied to each die set. The results include the magnitude and distribution of effective strains along the center line of the cylindrical workpiece and the final shape of the workpiece. Good agreement was observed in comparison with experimental data from physical modeling method, and several suggestions were made for choosing suitable dies.

scholarly journals FINITE ELEMENT ANALYSIS OF SHADED POLE MOTOR BASED ON MAXWELL2D

2021 ◽  
Vol 25 (Special) ◽  
pp. 1-115-1-220
Author(s):  
Adnan J. Kazem ◽  
◽  
Amer M. Ali ◽  
Keyword(s):  
Finite Element Method ◽  
Finite Element Analysis ◽  
Finite Element ◽  
Induction Motor ◽  
Single Phase ◽  
Two Dimensional ◽  
Element Analysis ◽  
Analytical Results ◽  
Dimensional Finite Element ◽  
Good Agreement

Shaded pole induction motor is one of the simplest and least expensive types of single-phase motors, but one of the most difficult to analyze. In this paper, we adopted a two-dimensional finite element method 2DFEM, which is one of the most accurate methods to analyze such motors. We used Ansys Maxwell2D software with assist of AutoCAD software in modeling and analyzing a reluctance-augmented shaded pole motor. The 2DFEM results of torques and currents for this motor obtained from Maxwell2D were compared with the analytical results and appeared a good agreement.

Study on Forming Mechanism of Bimetal-Pipe by External Hydraulic Contraction

2018 ◽  
Author(s):  
Quanzhao Sun ◽  
Guolai Yang ◽  
Jianli Ge ◽  
Baochun Lu ◽  
Yanming Song
Keyword(s):  
Finite Element ◽  
Elastic Recovery ◽  
Hydraulic Pressure ◽  
Forming Process ◽  
Element Analysis ◽  
Forming Mechanism ◽  
Upper Limits ◽  
Dimensional Finite Element ◽  
Good Agreement ◽  
Outer Pipe

It is widely known that a bimetal-pipe can be produced by internal hydraulic expansion. An inevitable limitation of which is that the elastic recovery of the outer pipe should be greater than that of the inner pipe when the forming pressure is released. And the existing techniques usually result in plastic deformation of the inner pipe. Considering the circumstance that elastic recovery of the inner pipe is greater than that of the outer pipe, or only elastic deformation in the inner pipe is allowed, an analytical model was developed to investigate the forming process of bimetal-pipes by external hydraulic contraction. The deformation compatibility condition of the bimetal-pipe was obtained according to the deformation rule. The formula relating the applied external hydraulic pressure and the residual contact pressure between the inner and the outer pipes was derived, and the lower and upper limits of the external hydraulic forming pressures were studied. A two-dimensional finite element analysis of the hydraulic contraction forming process of the bimetal-pipe was conducted. The comparison between the theoretical results and the finite element solutions shows that they are in good agreement. The presented methodology can be used in design and manufacturing of bimetal-pipes where the forming pressure should be applied on the outside surface.

Finite Element Modeling of Shear-Slitting Process

2012 ◽  
Vol 459 ◽  
pp. 3-6 ◽  
Author(s):  
Mang Ding ◽  
Di Ping Wu ◽  
Qin Qin
Keyword(s):  
Finite Element ◽  
Metal Cutting ◽  
Shear Failure ◽  
Element Model ◽  
Failure Criteria ◽  
Mass Scaling ◽  
Dimensional Finite Element ◽  
Material Separation ◽  
Sheet Metal Cutting ◽  
Good Agreement

Shear-slitting is a sheet metal cutting process used for dividing coiled sheet into narrower coils. In this paper, a two-dimensional finite element model was developed for the calculation of the shear-slitting process by using ABAQUS/Explicit. The shear failure criteria and the element-delete method were adopted to model the material separation. Mass scaling was used to reduce the solution time. The effect of clearance on the burr height was investigated. The simulation results show good agreement with experimental results. The critical clearance values was suggested for decreasing the burr.

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