scholarly journals Development of a Friction-Driven Finite Element Model to Simulate the Load Bridging Effect of Unit Loads Stored in Warehouse Racks

2021 ◽  
Vol 11 (7) ◽  
pp. 3029
Author(s):  
Eduardo Molina ◽  
Laszlo Horvath ◽  
Robert L. West
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Design Methodology ◽  
Load Capacity ◽  
Element Model ◽  
Raw Material ◽  
Affecting Factors ◽  
Unit Load ◽  
Load Beam ◽  
Bending Response

Current pallet design methodology frequently underestimates the load capacity of the pallet by assuming the payload is uniformly distributed and flexible. By considering the effect of payload characteristics and their interactions during pallet design, the structure of the pallets can be optimized, and raw material consumption reduced. The objective of this study was to develop and validate a finite element model capable of simulating the bending of a generic pallet while supporting a payload made of corrugated boxes and stored on a warehouse load beam rack. The model was generalized in order to maximize its applicability in unit load design. Using a two-dimensional, nonlinear, implicit dynamic model, it allowed for the evaluation of the effect of different payload configurations on the pallet bending response. The model accurately predicted the deflection of the pallet segment and the movement of the packages for a unit load segment with three or four columns of boxes supported in a warehouse rack support. Further refinement of the model would be required to predict the behavior of unit loads carrying larger boxes. The model presented provides an efficient solution to the study of the affecting factors to ultimately optimize pallet design. Such a model has not been previously developed. The model successfully acts as a tool to study and predict the load bridging performance of unit loads requiring only widely available input data, therefore providing a general solution.

Advanced design methodology for single and dual voltage wound core power transformers based on a particular finite element model

2006 ◽  
Vol 76 (9-10) ◽  
pp. 729-741 ◽  
Author(s):  
Marina A. Tsili ◽  
Antonios G. Kladas ◽  
Pavlos S. Georgilakis ◽  
Athanasios T. Souflaris ◽  
Dimitris G. Paparigas
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Design Methodology ◽  
Element Model ◽  
Power Transformers

scholarly journals Numerical analysis of concrete-filled spiral welded stainless steel tubes subjected to compression

2018 ◽  
Author(s):  
Dongxu Li ◽  
Brian Uy ◽  
Farhad Aslani ◽  
Chao Hou
Keyword(s):  
Finite Element ◽  
Stainless Steel ◽  
Finite Element Model ◽  
Mechanical Performance ◽  
Load Capacity ◽  
Element Model ◽  
Experimental Program ◽  
Design Parameters ◽  
Steel Tubes ◽  
Finite Element Software

Spiral welded stainless tubes are produced by helical welding of a continuous strip of stainless steel. Recently, concrete-filled spiral welded stainless steel tubes have found increasing application in the construction industry due to their ease of fabrication and aesthetic appeal. However, an in-depth understanding of the behaviour of this type of structure is still needed due to the lack of proper design guidance and insufficient experimental verification. In this paper, the mechanical performance of concrete-filled spiral welded stainless steel tubes will be numerically investigated with a commercial finite element software package, through which an experimental program can be designed properly. Specifically, the proposed finite element models take into account the effects of material and geometric nonlinearities. Moreover, the initial imperfections of stainless steel tubes and the form of helical welding will be appropriately included. Enhancement of the understanding of the analysis results can be achieved by extending results through a series of parametric studies based on the developed finite element model. Thus, the effects of various design parameters will be further evaluated by using the developed finite element model. Furthermore, for the purposes of wide application of such types of structure, the accuracy of the behaviour prediction in terms of ultimate strength based on current design codes will be studied. The authors herein compared the load capacity between the finite element analysis results and the existing codes of practice.

A Design Methodology for Tracked Vehicles Using Experimentally Identified Modal Parameters and the Finite Element Method

1994 ◽  
Author(s):  
M. K. Sarwar ◽  
A. A. Shabana ◽  
Toshikazu Nakanishi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Finite Element Model ◽  
Design Methodology ◽  
Element Model ◽  
Modal Parameters ◽  
The Finite Element Method ◽  
Tracked Vehicle ◽  
Made In ◽  
Element Method

Abstract The objective of this study is to develop a design procedure that integrates multibody techniques, the finite element method, and experimental modal analysis techniques. Multibody techniques and the finite element method are first used to develop and numerically test the performance of the proposed design. Based on this computer analysis, a prototype model can be built. The vibration modal parameters of this model can be determined experimentally and used with general purpose multibody computer programs to evaluate the performance of the design. The obtained numerical results can be compared with the results obtained previously using multibody techniques and the finite element method. Adjustments can then be made in the finite element description in order to obtain a more realistic model that compares well with the experimental data. Using the more realistic finite element model, design modifications can be made in order to improve the performance of the design model. The use of the design methodology proposed in this paper is demonstrated using a flexible tracked vehicle model that consists of fifty four interconnected bodies. In this model, the nonlinear contact forces that describe the interaction between the track links and the vehicle components and the ground are developed. The nonlinear dynamic equations of the vehicle are developed in terms of a coupled set of reference and chassis elastic modal coordinates. The flexibility of the chassis of the tracked vehicle is described using the finite element method and experimentally identified modal parameters. The results obtained using the finite element model are compared with the results obtained using experimentally identified modal parameters.

Finite element model simulation of hot forging of seamless elbow fittings

2005 ◽  
Vol 219 (2) ◽  
pp. 85-90 ◽  
Author(s):  
E Salas-Zamarripa ◽  
M P Guerrero-Mata ◽  
R Colás ◽  
J Martínez
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Simulation ◽  
Hot Forging ◽  
Element Model ◽  
Raw Material ◽  
Tooling Design ◽  
Critical Characteristics ◽  
Software Code ◽  
Hot Forging Process

This work presents the implementation of the hot-forging process of seamless elbow fittings into a finite element model (FEM) developed with the aid of a commercial software code. The strain gradients predicted by the FEM were compared with the strain distributions computed by a visioplastic analysis. Measurements made on forged elbows are used to validate the predictions of the FEM. Once the validation was successful, the FEM is used to evaluate the effect that the tooling design exerts on the final dimensions and characteristics of formed elbows; this was done by changing the design of the tooling (mandrel). Two critical characteristics are required in forged elbows; these are consistency in wall thickness and length of the external arc, as wall consistency is directly associated with product quality, whereas control on the length contributes to savings in raw material. Results found by the FEM allows the conclusion that these characteristics are related to each other.

scholarly journals Experimental and Numerical Investigation of Short-Term Behavior of Partially Precast and Partially Encased Composite Beams

2020 ◽  
Vol 28 (3) ◽  
pp. 29-39
Author(s):  
Liufeng Zhang ◽  
Yinghua Yang
Keyword(s):  
Finite Element ◽  
Load Capacity ◽  
Peak Load ◽  
Element Model ◽  
Bending Test ◽  
Test Results ◽  
Short Term ◽  
Element Analysis ◽  
The Finite Element Model ◽  
Bending Response

AbstractIn this paper, the short-term behavior of a new partially pre-cast and partially encased composite (PPEC) beam is studied. This paper reports the results of a 4-point bending test on a full-scale PPEC beam and sets out the load displacement response, short-term stiffness, peak load capacity and failure mode of the proposed PPEC beam. In addition, a finite element analysis of the PPEC beam is carried out, and the numerical simulation results are compared with the test results. The results show that the finite element model can reflect the bending response of the PPEC beam. In this paper, three different calculation methods are used to compare the deflection of the PPEC beam. The results show that the values calculated by the bending-shear coupling method formula agree relatively well with the test results.

scholarly journals A Pneumatic Novel Combined Soft Robotic Gripper with High Load Capacity and Large Grasping Range

Actuators ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 3
Author(s):  
Dan Wang ◽  
Xiaojun Wu ◽  
Jinhua Zhang ◽  
Yangyang Du
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Material Properties ◽  
Load Capacity ◽  
Element Model ◽  
High Load ◽  
Minimum Diameter ◽  
Practical Applications ◽  
Soft Actuator ◽  
High Load Capacity

Pneumatic soft grippers have been widely studied. However, the structures and material properties of existing pneumatic soft grippers limit their load capacity and manipulation range. In this article, inspired by sea lampreys, we present a pneumatic novel combined soft gripper to achieve a high load capacity and a large grasping range. This soft gripper consists of a cylindrical soft actuator and a detachable sucker. Three internal air chambers of the cylindrical soft actuator are inflated, which enables them to hold objects. Under vacuum pressure, the cylindrical soft actuator and the detachable sucker can both adsorb objects. A finite element model was constructed to simulate three inflation chambers for predicting the grasping range of the cylindrical soft actuator. The validity of the finite element model was established by an experiment. The mechanism of holding force and adsorption force were analyzed. Several groups of experiments were conducted to determine adsorption range, holding force, and adsorption force. In addition, practical applications further indicated that the novel combined soft gripper has a high load capacity (10.85 kg) at a low pressure (16 kPa) and a large grasping range (minimum diameter of the object: d = 6 mm), being able to lift a variety of objects with different weights, material properties, and shapes.

scholarly journals Analysis of RC Continuous Beams Strengthened with FRP Plates: A Finite Element Model

2016 ◽  
Vol 2 (11) ◽  
pp. 576-589 ◽  
Author(s):  
Mohamed A. Sakr ◽  
Tarek M. Khalifa ◽  
Walid N. Mansour
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Load Capacity ◽  
Element Model ◽  
Mixed Mode Fracture ◽  
Zone Model ◽  
Fe Model ◽  
Rc Beams ◽  
Continuous Beams ◽  
Externally Bonded

Strengthening of reinforced concrete (RC) beams with externally bonded fibre reinforced polymer (FRP) plates/sheets technique has become widespread in the last two decades. Although a great deal of research has been conducted on simply supported RC beams, a few studies have been carried out on continuous beams strengthened with FRP composites.  This paper presents a simple uniaxial nonlinear finite-element model (UNFEM) that is able to accurately estimate the load-carrying capacity and the behaviour of RC continuous beams flexurally strengthened with externally bonded FRP plates on both of the upper and lower fibres. A 21-degree of freedom element is proposed with layer-discretization of the cross-sections for finite element (FE) modelling. Realistic nonlinear constitutive relations are employed to describe the stress-strain behaviour of each component of the strengthened beam. The FE model is based on nonlinear fracture mechanics. The interfacial shear and normal stresses in the adhesive layer are presented using an analytical uncoupled cohesive zone model with a mixed-mode fracture criterion. The results of the proposed FE model are verified by comparison with various selected experimental measurements available in the literature. The numerical results of the plated beams (beams strengthened with FRP plates) agreed very well with the experimental results. The use of FRP increased the ultimate load capacity up to 100 % compared with the non-strengthened beams as occurred in series (S). The major objective of the current model is to help engineers’ model FRP-strengthened RC continuous beams in a simple manner.

scholarly journals Vertical Stress in the Gravel Decking of Log Bridges

2006 ◽  
Vol 21 (2) ◽  
pp. 61-67 ◽  
Author(s):  
C. Kevin Lyons ◽  
Matthew Lansdowne
Keyword(s):  
Finite Element ◽  
Stress Field ◽  
Finite Element Model ◽  
Element Model ◽  
Single Equation ◽  
Vertical Stress ◽  
Forest Industry ◽  
Horizontal Distance ◽  
Unit Load ◽  
Second Growth

Abstract As the forest industry moves into second growth stands with smaller tree diameters the design of gravel-decked log stringer bridges becomes more critical. This article considers the stress field at the base of the gravel decking. The results of this article indicate that stress equations derived from elastic theory for a semi-infinite solid underestimate the magnitude of the maximum vertical stress at the base of the gravel decking. Therefore, a finite element model (FEM) was used to estimate the stress field at the base of the gravel decking. A single equation was fit to the FEM results for a range of gravel depths using a unit load. This equation provides a method for estimating the vertical stress at the base of the gravel decking that is a function of the horizontal distance from the center of the tire contact patch and the total depth of the gravel decking.

Evaluation for RC Column Confined Partially with Externally FRP Wrapping Sheet Using Nonlinear FE Analysis

2019 ◽  
Vol 972 ◽  
pp. 129-133
Author(s):  
Yasmeen Taleb Obaidat
Keyword(s):  
Finite Element ◽  
Reinforced Concrete ◽  
Finite Element Model ◽  
Load Capacity ◽  
Element Model ◽  
Material Behavior ◽  
Nonlinear Material ◽  
Concrete Column ◽  
Reinforced Concrete Column ◽  
Number Of Layers

Little research has been carried out in validating, fiber reinforced polymer (FRP) concrete strengthened column and the effective using partial wrapping. Also the effect of several parameter on strengthen column using the partial wrapping sheet of desired width and thickness around column have not been found out. To this end, a nonlinear 3D finite element model has been developed in current study for CFRP strengthened reinforced concrete column to simulate the behavior accompanied by the effect of partial wrapping with emphasis on load capacity and failure mode. The finite element simulation of CFRP strengthened RC columns is performed using commercial finite element program ABAQUS. Modelling was conducted on reinforced concrete columns with dimensions of 160 x 250 x 960 mm. The finite element model incorporates the nonlinear material behavior of concrete, bilinear stress-strain curve of steel and linear elastic behavior of CFRP material. The concrete was modeled using a plastic damage model. The performance of the FE model was studied by simulating experimental columns from the literature. The load, and strain of CFRP obtained from the FE study were compared with the corresponding experimental results. The FEM results agreed well with the experiments. In addition, to enhance our understanding of the behavior of strengthened reinforced concrete column capacity using partial wrapping the effect of changing the spacing between the CFRP sheets and number of layers were examined. The increase number of layers and decrease spacing give a higher ultimate load capacity, and delay the failure.

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