Numerical Analysis of Powder Forging Under Various Initial Density Distributions and Friction Conditions

2005 ◽  
Author(s):  
T. Asawapishayachote ◽  
J. Carmai ◽  
A. Manonukul
Keyword(s):  
Finite Element ◽  
Density Distribution ◽  
Deformation Behaviour ◽  
Initial Density ◽  
Hot Forging ◽  
Finite Element Models ◽  
Porous Powder ◽  
Porous Preform ◽  
Density Distributions ◽  
Finite Element Software

Finite element models have been developed to simulate forging of sintered porous powder metal. The deformation behaviour of the porous preform during hot forging has been described by the Duva and Crow porous material constitutive model. It has been implemented into general purpose nonlinear finite element software within a large deformation formulation. Most of the previous finite element analyses of the deformation of this porous preform always assume an initial homogeneous density distribution within the compacted porous preform. However, the compacted parts obtained after compaction and sintering usually possess inhomogeneous density distribution. The present finite element models therefore take into account the initial distribution of relative density within the preform. The simulations have been conducted for various initial density distributions and under various frictional conditions in order to investigate the deformation characteristics and the evolution of voids in the forging process.

Wing-Fuselage Lug Stress Prediction Using Finite Element Method

2013 ◽  
Vol 393 ◽  
pp. 317-322
Author(s):  
Abdul Malik Hussein Abdul Jalil ◽  
Wahyu Kuntjoro
Keyword(s):  
Finite Element ◽  
Load Distribution ◽  
Applied Load ◽  
Maximum Stress ◽  
Finite Element Models ◽  
Finite Element Analyses ◽  
Finite Element Software ◽  
Stress Prediction ◽  
Reaction Forces ◽  
The Individual

This paper describes the methodology to predict the stress level that occurs at the wing-fuselage lugs (joints). The finite element models of the wing, the wing lugs and the fuselage lugs were developed. Finite Element Analyses were performed using NASTRAN finite element software. CQUAD4 and BAR2 elements were used to represent the individual structures of the wing such as the ribs and stringers. The applied load was based on the symmetrical level flight condition. Once the load distribution acting at the wing had been calculated and applied, reaction forces at the nodes representing the wing lugs were obtained and these values applied to the lug models where the maximum stress value acting at the lugs was obtained.

Coupled Porohyperelastic Mass Transport (PHEXPT) Finite Element Models for Soft Tissues Using ABAQUS

2011 ◽  
Vol 133 (4) ◽  
Author(s):  
Jonathan P. Vande Geest ◽  
B. R. Simon ◽  
Paul H. Rigby ◽  
Tyler P. Newberg
Keyword(s):  
Finite Element ◽  
Mass Transport ◽  
Soft Tissues ◽  
Convective Transport ◽  
Finite Deformations ◽  
Nonlinear Material ◽  
Finite Element Models ◽  
Finite Element Software ◽  
Mobile Species ◽  
Highly Nonlinear

Finite element models (FEMs) including characteristic large deformations in highly nonlinear materials (hyperelasticity and coupled diffusive/convective transport of neutral mobile species) will allow quantitative study of in vivo tissues. Such FEMs will provide basic understanding of normal and pathological tissue responses and lead to optimization of local drug delivery strategies. We present a coupled porohyperelastic mass transport (PHEXPT) finite element approach developed using a commercially available ABAQUS finite element software. The PHEXPT transient simulations are based on sequential solution of the porohyperelastic (PHE) and mass transport (XPT) problems where an Eulerian PHE FEM is coupled to a Lagrangian XPT FEM using a custom-written FORTRAN program. The PHEXPT theoretical background is derived in the context of porous media transport theory and extended to ABAQUS finite element formulations. The essential assumptions needed in order to use ABAQUS are clearly identified in the derivation. Representative benchmark finite element simulations are provided along with analytical solutions (when appropriate). These simulations demonstrate the differences in transient and steady state responses including finite deformations, total stress, fluid pressure, relative fluid, and mobile species flux. A detailed description of important model considerations (e.g., material property functions and jump discontinuities at material interfaces) is also presented in the context of finite deformations. The ABAQUS-based PHEXPT approach enables the use of the available ABAQUS capabilities (interactive FEM mesh generation, finite element libraries, nonlinear material laws, pre- and postprocessing, etc.). PHEXPT FEMs can be used to simulate the transport of a relatively large neutral species (negligible osmotic fluid flux) in highly deformable hydrated soft tissues and tissue-engineered materials.

Finite Element Analysis of Woven Airbeams

2006 ◽  
Author(s):  
Christopher G. Malm ◽  
William G. Davids ◽  
Michael L. Peterson ◽  
Hui Zhang
Keyword(s):  
Finite Element ◽  
Finite Element Models ◽  
Storage Space ◽  
Element Analysis ◽  
Irreversible Damage ◽  
Three Point Bending ◽  
Finite Element Software ◽  
Mesh Density ◽  
Explicit Solver ◽  
Solution Accuracy

The underlying mechanics of airbeam structures continues to be a topic of current research. Airbeams are attractive because they have the advantage of outstanding strength-to-weight ratios, can deform without causing irreversible damage to the structure, and the deflated storage space is small. Major challenges in the analysis of airbeams include capturing fabric wrinkling under small compressive strains and incorporating the effects of internal pressure. This paper presents results from analyses of cylindrical woven airbeams using the commercial finite element software package ABAQUS. Models are created using a combination of shell and membrane elements, and loaded in three point bending. The models are solved as quasi-static using the ABAQUS/Explicit solver. The effects of mesh density and material damping on solution accuracy are investigated. Results of the finite element models are compared to experimental data.

scholarly journals High throughput phenotyping of cross-sectional morphology to assess stalk lodging resistance

Plant Methods ◽  
2022 ◽  
Vol 18 (1) ◽  
Author(s):  
Yusuf A. Oduntan ◽  
Christopher J. Stubbs ◽  
Daniel J. Robertson
Keyword(s):  
Finite Element ◽  
High Throughput ◽  
Plant Traits ◽  
Finite Element Models ◽  
Vascular Bundles ◽  
Lodging Resistance ◽  
Cross Sectional ◽  
Conium Maculatum ◽  
Finite Element Software ◽  
Stalk Lodging

Abstract Background Stalk lodging (mechanical failure of plant stems during windstorms) leads to global yield losses in cereal crops estimated to range from 5% to 25% annually. The cross-sectional morphology of plant stalks is a key determinant of stalk lodging resistance. However, previously developed techniques for quantifying cross-sectional morphology of plant stalks are relatively low-throughput, expensive and often require specialized equipment and expertise. There is need for a simple and cost-effective technique to quantify plant traits related to stalk lodging resistance in a high-throughput manner. Results A new phenotyping methodology was developed and applied to a range of plant samples including, maize (Zea mays), sorghum (Sorghum bicolor), wheat (Triticum aestivum), poison hemlock (Conium maculatum), and Arabidopsis (Arabis thaliana). The major diameter, minor diameter, rind thickness and number of vascular bundles were quantified for each of these plant types. Linear correlation analyses demonstrated strong agreement between the newly developed method and more time-consuming manual techniques (R2 > 0.9). In addition, the new method was used to generate several specimen-specific finite element models of plant stalks. All the models compiled without issue and were successfully imported into finite element software for analysis. All the models demonstrated reasonable and stable solutions when subjected to realistic applied loads. Conclusions A rapid, low-cost, and user-friendly phenotyping methodology was developed to quantify two-dimensional plant cross-sections. The methodology offers reduced sample preparation time and cost as compared to previously developed techniques. The new methodology employs a stereoscope and a semi-automated image processing algorithm. The algorithm can be used to produce specimen-specific, dimensionally accurate computational models (including finite element models) of plant stalks.

Research on the Influence of the Stiffening Plates on the Stress of Hold Hoop of Bent Cap

2019 ◽  
Vol 815 ◽  
pp. 223-228
Author(s):  
Qin Tian ◽  
Cheng Hao Hang ◽  
Yun Peng Zou ◽  
Zi Xin Wan
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Stress Concentration ◽  
Structural Parameters ◽  
Great Influence ◽  
Finite Element Models ◽  
Finite Element Software ◽  
Bridge Steel ◽  
Calculation Results ◽  
Shell Finite Element

In order to improve the mechanical behaviour of bridge steel hoops, the plate shell finite element models of several steel hoops were established by using the general finite element software ABAQUS. Through changing the structural parameters of the stiffening plates, the influence of the stiffening plates on the mechanical properties of the steel hoops was explored. The calculation results show that the stress distribution at both ends of the steel hoop is uneven and there is a phenomenon of stress concentration. The spacing of stiffening plates has great influence on the mechanical properties of steel hoop. Some measures to improve the mechanical properties of steel hoop are given.

Study on Bending Behaviour of Triangular Web Profile Steel Section by Finite Element Analysis

2011 ◽  
Vol 94-96 ◽  
pp. 1539-1544 ◽  
Author(s):  
Fatimah De’nan ◽  
Nor Salwani Hashim
Keyword(s):  
Finite Element ◽  
Shell Element ◽  
Finite Element Models ◽  
Element Analysis ◽  
Bending Performance ◽  
Finite Element Software ◽  
Triangular Profile ◽  
Steel Sections ◽  
Element Type ◽  
Steel Section

A triangular web profile (TRIWP) steel section is a built-up section made up of two flanges connected to a web plate of triangular profile. This paper describes the study on the bending performance in major (Ix) and minor (Iy) axes of Triangular Web Profile (TRIWP) compared to flat web (FW) steel sections. A number of finite element models were developed using finite element software LUSAS version 14.3. Thin shell element which is a family of shell element in 3D dimension was chosen to represent the element type of the model. Two sizes of FW as control specimens and two sizes of TRIWP steel section which is 200×100×6×3 mm and 180×75×5×2 mm were used. Each of steel section was modeled using several spans such as 3m, 4m and 4.8m. The finite element results show that the deflections in major axes for TRIWP more than FW steel section. It was noted that, the value of Ix for the TRIWP is 0.754 to 1.523 times the Ix of FW steel section. On the other hand, the deflections in minor axes for TRIWP lower than FW steel section. The value of Iy for the TRIWP is 1.818 to 1.686 times the Iy of FW steel section. It can be concluded that the TRIWP is stiffer compared to FW steel section in minor axes and TRIWP has a higher resistance to bending in minor axes than FW steel section.

Numerical Analysis of Influence of Connection Stiffness on Dynamic Behaviors of Connected High-Rise Buildings

2011 ◽  
Vol 94-96 ◽  
pp. 393-396
Author(s):  
Lie De Wang ◽  
Wei Bin Yuan ◽  
Cheng Min Ye
Keyword(s):  
Finite Element ◽  
Dynamic Properties ◽  
Flexible Structures ◽  
Finite Element Models ◽  
Lateral Stiffness ◽  
Acceleration Response ◽  
Dynamic Behaviors ◽  
High Rise ◽  
Finite Element Software ◽  
Lateral Forces

With the increase of the height, the lateral stiffness of high-rise buildings decreased. The high and flexible structures would have large movement when they are suffered lateral forces arising from earthquakes and winds. In order to investigate the influence mechanisms on dynamic behaviors of three-towers-connected high-rise building that caused by connection stiffness, various finite element models with different connection location and number are established and the dynamic properties are analyzed by finite element software ADINA. The results show that the influences of connection stiffness on structural natural cycle are obvious, and the impacts on displacement and acceleration response are minor.

scholarly journals High Throughput Phenotyping of Cross-sectional Morphology to Assess Stalk Lodging Resistance

2021 ◽  
Author(s):  
Yusuf A Oduntan ◽  
Christopher J Stubbs ◽  
Daniel J Robertson
Keyword(s):  
Finite Element ◽  
High Throughput ◽  
Plant Traits ◽  
Finite Element Models ◽  
Vascular Bundles ◽  
Lodging Resistance ◽  
Cross Sectional ◽  
Conium Maculatum ◽  
Finite Element Software ◽  
Stalk Lodging

Abstract Background Stalk lodging (mechanical failure of plant stems during windstorms) leads to global yield losses in cereal crops estimated to range from 5% - 25% annually. The cross-sectional morphology of plant stalks is a key determinant of stalk lodging resistance. However, previously developed techniques for quantifying cross-sectional morphology of plant stalks are relatively low-throughput, expensive and often require specialized equipment and expertise. There is need for a simple and cost-effective technique to quantify plant traits related to stalk lodging resistance in a high-throughput manner.Results A new phenotyping methodology was developed and applied to a range of plant samples including, maize (Zea mays), sorghum (Sorghum bicolor), wheat (Triticum aestivum), poison hemlock (Conium maculatum), and Arabidopsis (Arabis thaliana). The major diameter, minor diameter, rind thickness and number of vascular bundles were quantified for each of these plant types. Linear correlation analyses demonstrated strong agreement between the newly developed method and more time-consuming manual techniques (R2>0.9). In addition, the new method was used to generate several specimen-specific finite element models of plant stalks. All the models compiled without issue and were successfully imported into finite element software for analysis. All the models demonstrated reasonable and stable solutions when subjected to realistic applied loads.Conclusions A rapid, low-cost, and user-friendly phenotyping methodology was developed to quantify two-dimensional plant cross-sections. The methodology offers reduced sample preparation time and cost as compared to previously developed techniques. The new methodology employs a stereoscope and a semi-automated image processing algorithm. The algorithm can be used to produce specimen-specific, dimensionally accurate computational models (including finite element models) of plant stalks.

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