scholarly journals NUMERICAL-EXPERIMENTAL EVALUATION OF A HYPERELASTIC POLYURETHANE ADHESIVE

10.6036/9783 ◽  
2021 ◽  
Vol 96 (3) ◽  
pp. 246-249
Author(s):  
ADI CORRALES MAGALLANES ◽  
LUIS DEL LLANO VIZCAYA ◽  
CELSO EDUARDO CRUZ GONZALEZ ◽  
VICENTE BRINGAS RICO ◽  
ALDO AUGUSTO LOPEZ MARTINEZ ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Critical Load ◽  
Stress Test ◽  
Experimental Tests ◽  
Stress Tests ◽  
The Finite Element Method ◽  
Yeoh Model ◽  
Hyperelastic Model ◽  
Element Method

This article presents the results of the experimental tests carried out on a polyurethane hyperelastic adhesive. The Mooney-Rivlin, Ogden and Yeoh models were analyzed between others, with different order and parameters using the finite element method and the Ansys V17.1 package, with the aim of evaluating the convergence of a general hyperelastic model, to subsequently manufacture specimens and perform experimental uniaxial stress tests. The information obtained from the tests was supplied to a curve fitting model for several hyperelastic models, seeking to obtain a correlation between these tests. New analyzes were performed with the finite element method with the materials considered and the curves adjusted. The results were studied and the numerical hyperelastic model closest to reality was selected, observing that the 1st order Yeoh model presented significant deviations between -30% to 60% in the experimental stiffness, the 3rd order Yeoh model presented deviations of -5% to -30%, while Ogden models of 1st and 3rd order presented deviations of -3.5% to 25% and -3% to 20%, before approaching the critical load, where the model of Ogden of 1st order presented a deviation of 0.66% and that of 3rd order of -3.59%. The 2 parameter Mooney-Rivlin model presents a deviation of 3.9% when it approaches the critical load, but values from -2.04% to 15% during the development of the stress test, so that model proved to be the most appropriate to analyze the material investigated in this work. Key Words: Hyperelastic material, Experimental Methods, Numerical Methods, FEA

scholarly journals Cold Expansion Process with Multiple Balls—Numerical Simulation and Comparison with Single Ball and Tapered Mandrels

Materials ◽  
2020 ◽  
Vol 13 (23) ◽  
pp. 5536
Author(s):  
David Curto-Cárdenas ◽  
Jose Calaf-Chica ◽  
Pedro Miguel Bravo Díez ◽  
Mónica Preciado Calzada ◽  
Maria-Jose Garcia-Tarrago
Keyword(s):  
Numerical Simulation ◽  
Finite Element Method ◽  
Finite Element ◽  
Fatigue Life ◽  
Experimental Tests ◽  
The Finite Element Method ◽  
Expansion Process ◽  
Cold Expansion ◽  
Hoop Stresses ◽  
Element Method

Cold expansion technology is an extended method used in aeronautics to increase fatigue life of holes and hence extending inspection intervals. During the cold expansion process, a mechanical mandrel is forced to pass along the hole generating compressive residual hoop stresses. The most widely accepted geometry for this mandrel is the tapered one and simpler options like balls have generally been rejected based on the non-conforming residual hoop stresses derived from their use. In this investigation a novelty process using multiple balls with incremental interference, instead of a single one, was simulated. Experimental tests were performed to validate the finite element method (FEM) models and residual hoop stresses from multiple balls simulation were compared with one ball and tapered mandrel simulations. Results showed that the use of three incremental balls significantly reduced the magnitude of non-conforming residual hoop stresses and the extension of these detrimental zone.

Buckling and bending properties of aluminium plate with multiple cracks

2020 ◽  
Vol 2 (106) ◽  
pp. 49-53
Author(s):  
J.H. Mohmmed ◽  
N.Y. Mahmood ◽  
M. Ali ◽  
A.A. Zainulabdeen
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Critical Load ◽  
Critical Loads ◽  
Bending Strength ◽  
Multiple Cracks ◽  
The Finite Element Method ◽  
Model Data ◽  
Transverse Cracks ◽  
Element Method

Purpose: In this paper, the bending strength and buckling stability of (AA 7075-T6) aluminium plate weakened by many transverse cracks, which located at different positions, subjected to concentrated loads applied at the ends were analysed. Design/methodology/approach: Numerical modelling and calculation by the finite element method (ANSYS Package), for the critical load of bending and compression panel were estimated. Findings: It found that the variation of the critical stress in bending and buckling is proportional to the crack conditions (no. of crack and location). In general, the critical load in bending and buckling decreases with increasing the crack number in structure. Research limitations/implications: For both bending and buckling, two transverse cracks on one face of plate is more stable than two transverse cracks on opposite faces. Practical implications: In addition, many experimental tests were carried out by using an INSTRON test machine to obtain the buckling critical loads, where the experimental results were compared with the ones of the finite element method. Furthermore, bending strength was calculated theoretically for the cracked panel. Originality/value: Comparison between the experimental and numerical (FE based model) data and between the theoretical and nu-merical (FE based model) data for buckling and bending strength respectively indicate the precise and the simplicity of the developed models to determine the critical loads in such cases.

Experimental and numerical investigation of wrinkling and tube ovality in the rotary draw bending process

2019 ◽  
Vol 233 (16) ◽  
pp. 5568-5584 ◽  
Author(s):  
R Safdarian
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Experimental Tests ◽  
Steel Tube ◽  
Numerical Results ◽  
The Finite Element Method ◽  
Rotary Draw Bending ◽  
Bending Process ◽  
Draw Bending ◽  
Element Method

The tube wrinkling, ovality, and fracture are the main defects in the rotary draw bending process, which happen by incorrect selection of process parameters. In the present study, the wrinkling, fracture, and ovality of BS 3059 steel tube in the rotary draw bending were investigated using the experimental tests and the finite element method. The numerical results were verified using the experimental tests for tube ovality prediction. The tube fracture was predicted using the Gurson–Tvergaard–Needleman damage model in the rotary draw bending numerical simulations. The design of experiment based on the response surface method and the finite element method was used to investigate the effects of rotary draw bending parameters such as boosting velocity of pressure die, mandrel position, number of balls, and pressure of pressure die on the wrinkling, fracture, and tube ovality. The experimental and numerical results indicated that the mandrel position was one of the main parameters, which influence the tube ovality. The tube ovality and wrinkling increased with the increase in the mandrel position.

scholarly journals Internal ballistics of polygonal and grooved barrels: A comparative study

2021 ◽  
Vol 104 (2) ◽  
pp. 003685042110169
Author(s):  
Usiel S Silva-Rivera ◽  
Luis Adrian Zúñiga-Avilés ◽  
Adriana H Vilchis-González ◽  
Pedro A Tamayo-Meza ◽  
Wilbert David Wong-Angel
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Comparative Study ◽  
Experimental Tests ◽  
Loading Conditions ◽  
The Finite Element Method ◽  
Maximum Deformation ◽  
Internal Ballistics ◽  
Internal Deformation ◽  
Element Method

As a parameter important ballistic, the research about polygonal and grooved barrels’ behavior has not been widely carried out. The pressures, velocities, stresses, deformations, and strains generated by the firing of 9 mm × 19 mm ammunition in weapons with polygonal barrels are analyzed numerically and experimentally, compared with those generated in pistols with grooved barrels. The Finite Element Method with equal boundary and loading conditions was used in both types of guns, specifying the actual materials of the projectile and the barrels. Subsequently, experimental tests were carried out on various weapons with 9 mm ammunitions of 115, 122, and 124 gr. The results show that the 9 mm bullet fired in a polygonal barrel undergoes a maximum deformation towards its exterior of 0.178 mm and interior of 0.158 mm, with stress up to 295.85 MPa. Compared with 0.025 mm maximum external deformation and 0.112 mm internal deformation of 9 mm projectiles fired in a grooved barrel, with stress up to 269.79 MPa. The deformation in the polygonal barrel is in a greater area, but the rifling impression left is less deep, making its identification more difficult. Although there are differences in the stresses and strains obtained, similar velocity and pressure parameters are achieved in the two types of barrels. This has application in the development and standardization of new kinds of barrels and weapons.

scholarly journals Assessment of the Suitability of Elastomeric Bearings Modeling Using the Hyperelasticity and the Finite Element Method

Materials ◽  
2021 ◽  
Vol 14 (24) ◽  
pp. 7665
Author(s):  
Marcin Daniel Gajewski ◽  
Mikołaj Miecznikowski
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Constitutive Relations ◽  
Experimental Tests ◽  
Uniaxial Tensile ◽  
Uniaxial Tensile Test ◽  
Compression Tests ◽  
The Finite Element Method ◽  
Elastomeric Bearings ◽  
Element Method

The paper presents modeling of bridge elastomeric bearings using large deformation theory and hyperelastic constitutive relations. In this work, the simplest neo-Hookean model was compared with the Yeoh model. The parameters of the models were determined from the elastomer uniaxial tensile test and then verified with the results from experimental bearing compression tests. For verification, bearing compression tests were modeled and executed using the finite element method (FEM) in ABAQUS software. Additionally, the parameters of the constitutive models were determined using the inverse analysis method, for which the simulation results were as close as possible to those recorded during the experimental tests. The overall assessment of the suitability of elastomer bearings modeling with neo-Hookean and Yeoh hyperelasticity models is presented in detail.

Test Study on Bearing Behaviors of Piles Considering the Influence of Caves

2012 ◽  
Vol 204-208 ◽  
pp. 848-852
Author(s):  
Sheng Gen Huang ◽  
Hui Cao
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Static Load ◽  
Stress Tests ◽  
The Finite Element Method ◽  
Test Study ◽  
Load Tests ◽  
Bearing Behavior ◽  
Element Method

Based on the static load tests and stress tests results of two cases in Karsts area, the bearing behavior of piles were analyzed and compared in this paper, caves in the base of piles not only affect the base resistances, but also affect the frictions of piles. The finite element method was applied to analyze the influence of rocks in the base of piles on bearing capacities of piles, according to the calculated results; the modulus of rocks affects the bearing capacities greatly, bearing capacities increase with the modulus of rocks increasing.

Nonlinear Analysis of Elastomeric Keyboard Domes

1989 ◽  
Vol 56 (4) ◽  
pp. 751-755 ◽  
Author(s):  
John H. Lau ◽  
Albert H. Jeans
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Large Deflection ◽  
The Finite Element Method ◽  
Closed Form Solutions ◽  
Nonlinear Responses ◽  
Calculated Load ◽  
Hyperelastic Model ◽  
Load Deflection Curve ◽  
Element Method

The large deflection of an elastomeric dome is studied using the finite element method. The material properties of the elastomer are described by a hyperelastic model in order to capture the strain energy stored in the dome during deformation. The nonlinear responses are determined by the modified Riks procedure, and the calculated load-deflection curve agrees well with experimental results. In addition, a pressurized thick-walled spherical hyperelastic shell is analyzed and the stress results obtained by the finite element method are in excellent agreement with the closed-form solutions. The results provide a better understanding of the mechanical behavior of elastomeric keyboard domes and demonstrate the feasibility of using the finite element method to design such structures.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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