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.

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.

scholarly journals Behavior of Interfaces between Granular Soil and Structure: A State-of-the-art Review

2015 ◽  
Vol 9 (1) ◽  
pp. 213-223 ◽  
Author(s):  
Yao-Kun Li ◽  
Xiao-Lei Han ◽  
Jing Ji ◽  
Dong-Long Fu ◽  
Yan-Kun Qiu ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Future Development ◽  
State Of The Art ◽  
Constitutive Relations ◽  
Granular Soil ◽  
Structural Components ◽  
The Finite Element Method ◽  
Numerical Techniques ◽  
Element Method

A state-of-the-art review of the behavior of interfaces between granular materials and solid structural components is presented. The review includes both the experimental and theoretical researches on the interfaces between soils and steel, as well as those between soils and concrete. Development of constitutive relations of such interfaces is also summarized. Furthermore, numerical techniques, both the Finite Element Method and the Discrete Element Method (DEM), to simulate the interface behaviors are stated. Aspects for future development in this area are also included.

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 Finite Element Method Application to Determine Appropriate Splitting Parameters for Dimensional Stone Quarries

2020 ◽  
Vol 1 (2) ◽  
Author(s):  
Pham VAN VIET ◽  
Nguyen ANH TUAN ◽  
Pham VAN HOA
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Regression Function ◽  
Practical Experience ◽  
Uniaxial Tensile ◽  
Dimension Stone ◽  
The Finite Element Method ◽  
Uniaxial Tensile Strength ◽  
Proper Splitting ◽  
Element Method

In dimension stone extraction, there have existed many block cutting techniques from intact rock or from a large block to smaller blocks such as disc sawing, chainsawing, diamond wire sawing and splitting techniques, one of which still has recently been used with the other modern methods is splitting techniques. The usage of the splitting methods has still based on the practical experience of mining workers on calculating the spacing of two holes in the co-planar line, resulting in increasing the roughness of the cutting face. The paper studies a relationship between beating force and two-hole spacing based on rock mass properties of dimension stone in order to find proper splitting parameters. The paper deploys the Finite Element Method (FEM) with computer simulation in 2D using Phase2 software. From input data including rock mechanics (unit density, Young’s modulus, Poisson’s rate), compressive pressure on the hole wall due to the force, the spacing, the simulation represents stress and displacement distributions along the two adjacent holes. A regression function for a relationship between the pressure and the spacing is established with the results of stress distribution along the two adjacent holes, compared to uniaxial tensile strength through running the software, which leads to making suggestions to appropriate splitting parameters.

scholarly journals Determining the Compression-Equivalent Deformation of SBR-Based Rubber Material Measured in Tensile Mode Using the Finite Element Method

2021 ◽  
Vol 2 (1) ◽  
pp. 195-208
Author(s):  
Sahbi Aloui ◽  
Mohammed El Yaagoubi
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Styrene Butadiene Rubber ◽  
Butadiene Rubber ◽  
Compression Tests ◽  
The Finite Element Method ◽  
Rubber Material ◽  
Styrene Butadiene ◽  
Element Method

A timesaving characterization approach of rubber materials in compression using the finite element method (FEM) is presented. Rubber materials based on styrene butadiene rubber (SBR) are subjected to tensile and compression tests. Using the neo–Hooke, Mooney–Rivlin and Yeoh material models, a compression-equivalent deformation of the SBR samples is derived from the tensile testing. The simulated state is then compared with the experimental results obtained from compression measurement. The deviation in the strain energy density between the measurements and the simulations depends on the quality of the fitting.

scholarly journals STUDY OF THE COMPRESSION BEHAVIOR OF SUNFLOWER SEEDS USING THE FINITE ELEMENT METHOD

AGROFOR ◽  
2019 ◽  
Vol 4 (1) ◽  
Author(s):  
Sorin-Ștefan BIRIȘ ◽  
Mariana IONESCU ◽  
Neluș-Evelin GHEORGHIȚĂ ◽  
Nicoleta UNGUREANU ◽  
Nicolae-Valentin VLĂDUȚ
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Mechanical Tests ◽  
Sunflower Seeds ◽  
Compression Tests ◽  
The Finite Element Method ◽  
Compression Process ◽  
Fem Model ◽  
Compression Behavior ◽  
Element Method

It is known that the phenomena that occur during compression of sunflower seedsare very complex. Comprehension of these phenomena is important for increasingthe performance of the equipment in the vegetable oil industry, both for thecracking of shells and for the grinding of kernels. Also for the pressing of oilseedmaterials it is helpful to understand the compression behavior of sunflower seeds.The major objective of this work is to find an easy way of highlighting how thestresses and deformations propagate in sunflower seeds kernels and shells duringthe compression process, with the aim of optimizing the energy consumptionrequired for the mechanical processing. Therefore, now days there is and we canuse the finite element method. This method is the most advanced engineering toolfor computing numerical and mathematical modeling of complex phenomenainvolving the propagation of stress and strain fields in continuous media. In thispaper a two-dimensional FEM model for analyzing sunflower seeds subjected atcompression by axial and lateral directions is presented. For experimentalvalidation of FEM model we made uniaxial compression tests on sunflower seeds,using a Hounsfield/Tinius Olsen unit for mechanical tests, H1KS model. Themodels used in this work highlight that the orientation of the seeds is veryimportant. There are situations when it is desirable that the stresses to be higher (atshelling, grinding, pressing, etc.) or situations when it is desirable that the stressesto be smaller (at transport, storage, etc.).

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