scholarly journals Thermal-Mechanical Coupled Manufacturing Simulation in Heterogeneous Materials

2016 ◽  
Vol 2 (11) ◽  
pp. 600-606 ◽  
Author(s):  
Abdelouahid El Amri ◽  
M. El Yakhloufi Haddou ◽  
A. Khamlichi
Keyword(s):  
Finite Element ◽  
Mechanical Damage ◽  
Numerical Procedure ◽  
Calibration Procedure ◽  
Finite Element Analyses ◽  
Element Simulation ◽  
Proposed Model ◽  
Main Target ◽  
6061 Aluminium Alloy ◽  
Strength And Ductility

This work is aimed to investigate on thermal and thermo-mechanical behaviour of 6061 Aluminium alloy. The main target of the present investigation is to apply a numerical procedure to assess the thermo-mechanical damage. Finite element analyses of the notched tensile specimens at high temperature have been carried out using ABAQUS Software. The objective was to study the combined effects of thermal and mechanical loads on the strength and ductility of the material. The performance of the proposed model is in general good and it is believed that the presented results and experimental–numerical calibration procedure can be used in practical finite-element simulation.

Investigation on endurance evaluation of a portal crane: experimental, theoretical and finite element analysis

2020 ◽  
Vol 62 (4) ◽  
pp. 357-364
Author(s):  
Yusuf Aytaç Onur ◽  
Hakan Gelen
Keyword(s):  
Finite Element ◽  
Critical Points ◽  
Maximum Stress ◽  
Strain Gages ◽  
Finite Element Analyses ◽  
Element Analysis ◽  
Element Simulation ◽  
Main Girder ◽  
Stressed Component ◽  
Portal Crane

Abstract In this study, the stress on portal crane components at various payloads has been investigated theoretically, numerically and experimentally. The portal crane was computer-aided modeled and finite element analyses were performed so that the most stressed points at the each trolley position investigated on the main girder could be determined. In addition, the critical points were marked on the portal crane, and strain gages were attached to the those critical points so that stress values could be experimentally determined. The safety factor values at different payloads were determined by using finite element simulation. Results indicate that the most stressed component in the examined portal crane is the main girder. Experimental results indicate that the maximum stress value on the main girder is 3.05 times greater than the support legs and 8.99 times larger than the rail.

Using Finite Element Method and Support Vector Machine to Evaluate Scour Bridge Condition

2013 ◽  
Vol 330 ◽  
pp. 900-904 ◽  
Author(s):  
Chung Wei Feng ◽  
Hsun Yi Huang
Keyword(s):  
Support Vector Machine ◽  
Finite Element ◽  
Bridge Piers ◽  
Support Vector ◽  
Generic Model ◽  
Bridge Structure ◽  
Safety Level ◽  
Element Simulation ◽  
Proposed Model ◽  
Bridge Failure

Scouring around bridge piers is one of the major reasons for bridge failures and makes disaster since it tends to occur suddenly and without prior warning. However, the mechanism of water flow around the pier structure is complicated, which makes it is very difficult to develop a generic model to evaluate the scour bridge condition and provide a safety level. In this study, an integrated model that combines support vector machine (SVM) and finite element simulation technology is introduced to estimate the scour depth and determinate the safety level of scour bridge by using the natural frequency of the bridge structure. The proposed model in this study provides effective way to have a prior understanding of scour bridge condition and avoid the disaster of bridge failure.

New Analytical Model of Bolted Joints

2004 ◽  
Vol 126 (4) ◽  
pp. 721-728 ◽  
Author(s):  
Ouqi Zhang ◽  
Jason A. Poirier
Keyword(s):  
Finite Element ◽  
Analytical Model ◽  
External Load ◽  
Bolted Joints ◽  
Finite Element Analyses ◽  
Conventional Theory ◽  
New Model ◽  
Proposed Model ◽  
Compression Members ◽  
Additional Member

The conventional theory of bolted joints adopts equivalent cylinders, cones or spheres for compression members. In this model, the member deformation is determined by the member stiffness that remains unchanged whether the external load is present. In fact, the external load causes an additional member deformation that is not determined by the member stiffness measured at pre-load. The external load also causes a member rotation, which not only reduces the member stiffness, but also delays the separation of the joint. Based on these observations, a new model of bolted joints is developed. Finite element analyses is performed to verify the proposed model.

A Method for Characterizing Running-In of Sliding Contacts

2016 ◽  
Vol 681 ◽  
pp. 228-233
Author(s):  
R. Ismail ◽  
M. Tauviqirrahman ◽  
J. Jamari ◽  
D.J. Schipper
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Pressure Distribution ◽  
Sliding Contact ◽  
Wear Depth ◽  
Contact Pressure Distribution ◽  
Sliding Contacts ◽  
Element Analysis ◽  
Element Simulation ◽  
Proposed Model

Although in terms of conservation wear is undesirable, however, running-in wear is encouraged rather than avoided. Running-in is rather complex and most of the studies related to the change in micro-geometry have been conducted statistically. The purpose of this study was to characterize the running-in of sliding contacts using finite element analysis based on measured micro-geometries. The developed model combines the finite element simulation, Archard’s wear equation and updated geometry to calculate the contact pressure distribution and wear depth. Results show that the proposed model is able to predict the running-in phase of sliding contact system.

scholarly journals Finite element modeling of nanoindentation on an elastic-plastic microsphere

2020 ◽  
Author(s):  
Jialian Chen ◽  
Hongzhou Li
Keyword(s):  
Finite Element ◽  
Mechanical Behavior ◽  
Computational Study ◽  
Theoretical Method ◽  
Finite Element Analyses ◽  
Structured Materials ◽  
Elastic Plastic ◽  
Element Simulation ◽  
Insight Into

Abstract The understanding of the mechanical indentation on a curved specimen (e.g., microspheres and microfibers) is of paramount importance in the characterization of curved micro-structured materials, but there has been no reliable theoretical method to evaluate the mechanical behavior of nanoindentation on a microsphere. This article reports a computational study on the instrumented nanoindentation of elastic-plastic microsphere materials via finite element simulation. The finite element analyses indicate that all loading curves are parabolic curves and the loading curve for different materials can be calculated from one single indentation. The results demonstrate that the Oliver-Pharr formula is unsuitable for calculating the elastic modulus of nanoindentation involving cured surfaces. The surface of the test specimen of a microsphere requires prepolishing to achieve accurate results of indentation on a micro-spherical material. This study provides new insight into the establishment of nanoindentation models that can effectively be used to simulate the mechanical behavior of a microsphere.

Surface to Through-Wall Crack Transition Model for Circumferential Cracks in Pipes

2021 ◽  
Author(s):  
Do Jun Shim ◽  
Jeong-Soon Park ◽  
Robert Kurth ◽  
David L. Rudland
Keyword(s):  
Finite Element ◽  
Crack Growth ◽  
Surface Crack ◽  
Outer Diameter ◽  
Transition Model ◽  
Finite Element Analyses ◽  
Transition Behavior ◽  
Final Surface ◽  
Proposed Model ◽  
Crack Transition

Abstract In the present paper, finite element analyses were performed to update and also extend the applicable ranges of the existing KI and COD solutions for non-idealized through-wall cracks. Then, a surface to through-wall crack transition model was proposed based on these solutions. The proposed model provides a criterion which determines when the final surface crack should transition to a through-wall crack. It also provides a criterion to determine the two crack lengths (at the inner and outer diameter surfaces) of the initial non-idealized through-wall crack. Furthermore, crack growth of non-idealized through-wall cracks can be simulated by using the proposed method. Finally, the proposed model was verified by demonstrating that it can well predict the surface to through-wall transition behavior when compared to the natural crack growth simulations.

scholarly journals Modeling the influence of connecting elements in wood products behavior: a numerical multi-scale approach

2018 ◽  
Vol 19 (3) ◽  
pp. 301 ◽  
Author(s):  
Luc Chevalier ◽  
Heba Makhlouf ◽  
Benoît Jacquet-Faucillon ◽  
Eric Launay
Keyword(s):  
Finite Element ◽  
Finite Element Simulation ◽  
Failure Process ◽  
Numerical Procedure ◽  
Wood Products ◽  
Image Correlation ◽  
Bending Test ◽  
3D Finite Element ◽  
Multi Scale ◽  
Element Simulation

Wood furniture is often composed of simple parts that may be modeled as beams or plates. These particularities allow using simplified approaches that reduces the number of degrees of freedom (dof for short) in a finite element simulation of the furniture's behavior. Generally, connections are not taken into account in such simulations but these connections are critical in the failure process of the furniture and it worth studying it precisely. Using a multi-scale approach, this paper introduces a numerical procedure to identify the connection contribution in the furniture's stiffness. Comparing 3D finite element calculations with a Timoshenko's beam calculation on a corner of two wooden parts, we identify the specific behavior of the connection elements (pins, nut, screw… and local 3D effects) to introduce it as a punctual 0D element in the beam code. Two validations of the approach are presented here: (i) a numerical validation by comparing the result of the beam code with a complete 3D finite element simulation on a representative plane structure of wooden furniture; (ii) an experimental validation by managing a global bending test and measuring the displacement field using digital image correlation (DIC for short).

A Parametric Modeling Method for Thin-Walled Frame Parts

2010 ◽  
Vol 426-427 ◽  
pp. 13-16
Author(s):  
H.B. Wu ◽  
Yuan Wei Liu
Keyword(s):  
Finite Element ◽  
Prediction Method ◽  
Element Model ◽  
Parametric Modeling ◽  
Modeling Method ◽  
Element Simulation ◽  
Proposed Model ◽  
Distortion Analysis ◽  
House Building ◽  
The Finite Element Model

In this study, a method called “house-building frame modeling” based on the APDL language is introduced firstly, and the finite element model of the milling distortion analysis is established for a platform structure with 192 frames by the method, and the prediction analysis of the milling distortion under different milling conditions is carried out, by means of 3-D finite element simulation technology. Comparing the simulation results and the measurement ones of the milling distortion, the proposed model is modified; the modeling method and prediction method are proved to be effective.

An inverse method for prediction of the required temperature distribution in the creep forming process

1998 ◽  
Vol 212 (1) ◽  
pp. 7-11 ◽  
Author(s):  
P Moreau ◽  
D Lochegnies ◽  
J Oudin
Keyword(s):  
Finite Element ◽  
Temperature Distribution ◽  
Inverse Method ◽  
Numerical Procedure ◽  
Small Variation ◽  
Optimization Method ◽  
Glass Sheet ◽  
Finite Element Analyses ◽  
Forming Process ◽  
Identification Procedure

To achieve the creep forming of glass sheet from designer specifications, the manufacturer has to know the required temperature distribution in the glass sheet accurately: a small variation of the temperature produces great change in the viscosity, and therefore, in the final shape of the sheet. In order to find this distribution, the authors propose an inverse identification procedure based on an optimization method and finite element analyses. The inverse problem is solved using a modified Levenberg—Marquardt method to match the measured displacements to the finite element solutions which depend on the unknown forming parameters. The manufacture of recent rear automotive screens illustrates this efficient numerical procedure.

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