scholarly journals Numerical and Experimental Stress-Strain Analysis of a Rubber Carousel

TEM Journal ◽  
2021 ◽  
pp. 1662-1667
Author(s):  
Peter Koščák ◽  
Ľubomír Ambriško ◽  
Karol Semrád ◽  
Marasová, Jr. Daniela ◽  
Vladimír Mitrík
Keyword(s):  
Mechanical Load ◽  
Impact Load ◽  
Mechanical Damage ◽  
Strain Analysis ◽  
Material Model ◽  
Stress Strain ◽  
Conveyor Belts ◽  
Optimal Material ◽  
Comparison Of The Results ◽  
The Impact

The effect of the impact load exerted by the baggage impacting light baggage carousels may be manifested as mechanical damage to the carousel as a result of the stress-strain processes. In order to describe the phenomena related to the baggage impact, it is important to monitor the tensile strength of rubber carousels of light conveyor belts intended for the conveyance of baggage at airports. The output of the article is monitoring the mechanical load of the carousel, the comparison of the results thereof with the outputs of the CAE analysis, as well as the determination of the optimal material model and the approximation thereof to the experimental model.

Delamination in the scoring and folding of paperboard

TAPPI Journal ◽  
2012 ◽  
Vol 11 (1) ◽  
pp. 61-66 ◽  
Author(s):  
DOEUNG D. CHOI ◽  
SERGIY A. LAVRYKOV ◽  
BANDARU V. RAMARAO
Keyword(s):  
Finite Element ◽  
Plane Deformation ◽  
Strain Analysis ◽  
Local Strain ◽  
Uniaxial Stress ◽  
Material Model ◽  
Element Model ◽  
Plastic Behavior ◽  
Stress Strain ◽  
Strain Fields

Delamination between layers occurs during the creasing and subsequent folding of paperboard. Delamination is necessary to provide some stiffness properties, but excessive or uncontrolled delamination can weaken the fold, and therefore needs to be controlled. An understanding of the mechanics of delamination is predicated upon the availability of reliable and properly calibrated simulation tools to predict experimental observations. This paper describes a finite element simulation of paper mechanics applied to the scoring and folding of multi-ply carton board. Our goal was to provide an understanding of the mechanics of these operations and the proper models of elastic and plastic behavior of the material that enable us to simulate the deformation and delamination behavior. Our material model accounted for plasticity and sheet anisotropy in the in-plane and z-direction (ZD) dimensions. We used different ZD stress-strain curves during loading and unloading. Material parameters for in-plane deformation were obtained by fitting uniaxial stress-strain data to Ramberg-Osgood plasticity models and the ZD deformation was modeled using a modified power law. Two-dimensional strain fields resulting from loading board typical of a scoring operation were calculated. The strain field was symmetric in the initial stages, but increasing deformation led to asymmetry and heterogeneity. These regions were precursors to delamination and failure. Delamination of the layers occurred in regions of significant shear strain and resulted primarily from the development of large plastic strains. The model predictions were confirmed by experimental observation of the local strain fields using visual microscopy and linear image strain analysis. The finite element model predicted sheet delamination matching the patterns and effects that were observed in experiments.

Numerical Modeling and Analytical Investigation of Autofrettage Process on the Fluid End Module of Fracture Pumps

2018 ◽  
Vol 140 (4) ◽  
Author(s):  
Mahdi Kiani ◽  
Roger Walker ◽  
Saman Babaeidarabad
Keyword(s):  
Residual Stresses ◽  
Kinematic Hardening ◽  
Analytical Formula ◽  
Strain Analysis ◽  
Material Model ◽  
Analytical Investigation ◽  
Stress Strain ◽  
Element Analysis ◽  
Hardening Material ◽  
Strain Evolution

One of the most important components in the hydraulic fracturing is a type of positive-displacement-reciprocating-pumps known as a fracture pump. The fluid end module of the pump is prone to failure due to unconventional drilling impacts of the fracking. The basis of the fluid end module can be attributed to cross bores. Stress concentration locations appear at the bores intersections and as a result of cyclic pressures failures occur. Autofrettage is one of the common technologies to enhance the fatigue resistance of the fluid end module through imposing the compressive residual stresses. However, evaluating the stress–strain evolution during the autofrettage and approximating the residual stresses are vital factors. Fluid end module geometry is complex and there is no straightforward analytical solution for prediction of the residual stresses induced by autofrettage. Finite element analysis (FEA) can be applied to simulate the autofrettage and investigate the stress–strain evolution and residual stress fields. Therefore, a nonlinear kinematic hardening material model was developed and calibrated to simulate the autofrettage process on a typical commercial triplex fluid end module. Moreover, the results were compared to a linear kinematic hardening model and a 6–12% difference between two models was observed for compressive residual hoop stress at different cross bore corners. However, implementing nonlinear FEA for solving the complicated problems is computationally expensive and time-consuming. Thus, the comparison between nonlinear FEA and a proposed analytical formula based on the notch strain analysis for a cross bore was performed and the accuracy of the analytical model was evaluated.

A Study on Plastic Zones of 3 Point Bend Specimens under Various Impact Velocities

2003 ◽  
Vol 17 (08n09) ◽  
pp. 1349-1354
Author(s):  
Moon Sik Han ◽  
Jae Ung Cho ◽  
Ouk Sub Lee
Keyword(s):  
Impact Load ◽  
Compressive Load ◽  
Material Model ◽  
Static Displacement ◽  
Plastic Zones ◽  
Point Bend ◽  
Displacement Speed ◽  
Von Mises ◽  
The Impact ◽  
Uncertain Boundary

In this paper, computer simulations of the mechanical behavior of 3 point bend (3PB) specimens with a quarter notch under impact load are performed. The cases with various impact velocities applied at the side of the specimen are considered. An elastic-plastic von Mises material model is chosen. Results from no viscoplastic and viscoplastic materials are compared. Their materials are applied with static displacement speed and various impact velocities. The configuration of the specimen has the reduced width at the ends. This modified 3PB specimen design has been studied in order to avoid the initial compressive load of the crack tip and also to avoid the uncertain boundary conditions at the impact heads.

scholarly journals Drop Simulation of 6M Drum With Locking-Ring Closure and Liquid Contents

2006 ◽  
Author(s):  
Tsu-Te Wu
Keyword(s):  
Impact Load ◽  
Three Dimensional ◽  
Structural Response ◽  
Material Model ◽  
Element Model ◽  
Ring Closure ◽  
Foot Drop ◽  
Torque Load ◽  
Three Dimensional Finite Element ◽  
The Impact

This paper presents the dynamic simulation of the 6M drum with a locking-ring type closure subjected to a 4.9-foot drop. The drum is filled with water to 98 percent of overflow capacity. A three dimensional finite-element model consisting of metallic, liquid and rubber gasket components is used in the simulation. The water is represented by a hydrodynamic material model in which the material’s volume strength is determined by an equation of state. The explicit numerical method based on the theory of wave propagation is used to determine the combined structural response to the torque load for tightening the locking-ring closure and to the impact load due to the drop.

scholarly journals Railway Track Stress–Strain Analysis Using High-Precision Accelerometers

2021 ◽  
Vol 11 (24) ◽  
pp. 11908
Author(s):  
Alexandr Avsievich ◽  
Vladimir Avsievich ◽  
Nikita Avsievich ◽  
Dmitry Ovchinnikov ◽  
Anton Ivaschenko
Keyword(s):  
High Precision ◽  
Strain Analysis ◽  
Railway Track ◽  
Rolling Stock ◽  
Mathematical Methods ◽  
Stress Strain ◽  
Technical Parameters ◽  
The Impact ◽  
The Internet Of Things ◽  
Track Line

We propose a new approach for railway path diagnostics on the basis of track line stress–strain analysis using the data provided by high-precision accelerometers. This type of sensor provides sufficient accuracy with lower costs, and enables the development of a railway digital twin, according to the concept of the Internet of Things. The installation of sensors on a railway track along its entire length allows real-time monitoring of the states of the technical parameters of the railway track, and using mathematical methods to evaluate its wear on the basis of constantly received data. This paper presents an original 3D model of a railway track line and the results of its analysis using a finite element method. To test the model, we performed an analysis of the normal stresses and deformations in the elements of a railway track by simulating the impact of rolling stock on a section of a railway track with intermediate rail fastenings, ZhBR-65SH. The research results were probated and tested at the testing ground of the Kuibyshev branch of Russian Railways, the Samara track. The proposed approach makes it possible to determine the load of the track, and knowing the movement of the rail, to calculate the structural stress in the elements of the railway track, to constantly monitor the parameters of the slope and rail subsidence.

Study on Stress-Strain Model of Metallic Materials with Shot Peening Residual Stress

2012 ◽  
Vol 591-593 ◽  
pp. 1121-1126 ◽  
Author(s):  
Tie Shan Zhang ◽  
Jing Hu ◽  
Jin Shui Wu
Keyword(s):  
Residual Stress ◽  
Strain Analysis ◽  
Material Model ◽  
Metallic Materials ◽  
Model Combination ◽  
Stress Strain ◽  
Modeling Tools ◽  
The Relationship ◽  
Strain Model ◽  
Test Result

Study on Stress-strain model of metallic materials with residual stress. First of all, Stress-strain model of metallic materials with residual stress was analyzed, then, derivation of a stress-strain model was done. Finally, according to the model of stress and strain analysis and derivation of results, taking diaphragm spring as an example, using methods of derivation of kinds of material obtained from this model portfolio, using finite element modeling tools, calculate the relationship between load and deformation. The test result indicated that, using the method of many kinds of material model combination can get the higher precision of calculation.

scholarly journals Determination of stress-strain state of reinforced slabs from non-linear material taking into account the influence of aggressive environment

2019 ◽  
Vol 27 (4) ◽  
pp. 488-503
Author(s):  
Alexandr Anatolyevich Treschev ◽  
Alexander Anatolyevich Bobryshev ◽  
Victor Grigoryevich Telichko ◽  
Lenar Nurgaleevich Shafigullin ◽  
Alexander Valeryevich Bashkatov
Keyword(s):  
Strain State ◽  
Mechanical Load ◽  
Basic Material ◽  
Stress Strain ◽  
Plastic Deformations ◽  
Aggressive Environment ◽  
Stress Strain State ◽  
Joint Influence ◽  
Non Linear ◽  
The Impact

In this article, the construction of finite-elemental model of definition of stress-strain state of reinforced concrete plates in conditions of active deformation and simple loading in combination with long-term influence of chloride-containing operating environment. Non-linear behavior of concrete is simulated based on the determining relations proposed by Treschev, cracking and plastic deformations in armature are taken into account. The impact of the aggressive environment is taken into account in accordance with the model proposed by Petrov and Penina. In the article all basic correlations of finite elements method in convenient for software realization on a computer are given. As the object of research for this article is a concrete plate reinforced with steel reinforcement in a stretched area, which is under the joint influence of mechanical load and aggressive chloride-containing environment on the protective polymer–concrete layer. The load was taken evenly distributed across the entire slab area. At the solution of this problem the non-linear sensitivity of the basic material (concrete) to the type of the tense condition, plastic deformations in armature, degradation of a protective concrete at influence of external aggressive environment are taken into account. In the article some especially characteristic results of mathematical modeling of the specified model problem are given. The obtained results of joint influence on the plate of mechanical load and aggressive environment are analyzed.

scholarly journals Wave processes in determining mechanical characteristics of soils

2019 ◽  
Vol 97 ◽  
pp. 04009 ◽  
Author(s):  
Karim Sultanov ◽  
Pavel Loginov ◽  
Sabida Ismoilova ◽  
Zulfiya Salikhova
Keyword(s):  
Soil Sample ◽  
Strain State ◽  
Wave Equations ◽  
Mechanical Characteristics ◽  
Impact Load ◽  
Wave Processes ◽  
Stress Strain ◽  
Stress Strain State ◽  
The Impact ◽  
The Relationship

Mechanical characteristics of soils under dynamic and static loads are determined in laboratory conditions on special devices. Dynamic loads in the devices are initiated by an impact on a soil sample. Under the impact the waves are initiated in soil; they significantly affect the stress-strain state of soil samples placed in the device. Depending on the parameters of the impact load in the device, in different sections of soil sample there arise the stress-strain states, different in quality and quantity. Mechanical characteristics of soil, determined by this stress-strain state, also differ. The effect of stress-strain state of soil on its mechanical characteristics can be estimated theoretically. The initiation of the wave process and dynamic stress-strain state in soil sample placed in the device can be theoretically examined in detail. In this regard, the wave problem is set, which corresponds to the statement of experiments on the device of dynamic loading of soil. The law of soil strain is taken as an elastic-viscoplastic one. Numerical solution of wave equations is obtained by the finite difference method. Based on the analysis of stress-strain state of soil in various sections, obtained by numerical calculations, the condition is derived under which the effect of wave processes on mechanical characteristics of soils is eliminated. This condition (formula) establishes the relationship between the wavelength, the velocity of wave propagation in soil, the thickness of the soil sample in the device and the duration of dynamic load.

Belt Damage Aspect to Impact Loading

2014 ◽  
Vol 683 ◽  
pp. 102-107 ◽  
Author(s):  
Ľubomír Ambriško ◽  
Vladimír Taraba ◽  
Stanislav Szabo ◽  
Martin Leco
Keyword(s):  
Design Of Experiments ◽  
Support System ◽  
Impact Loading ◽  
Impact Load ◽  
Conveyor Belt ◽  
Limit Value ◽  
Tension Load ◽  
Conveyor Belts ◽  
Effect Of The Support ◽  
The Impact

This paper presents the results of rubber products testing (rubber conveyor belt type P 2000/4, 8+4) with regard to their quality in order to establish the limit value of impact load, i.e. establish the maximum breakdown resistance. Outputs of measurements are in addition to the impact load also duration of impact, size of tension load and determination the effect of the support system for conveyor belts breakdown resistance. Using Design of Experiments method are identified factors that significantly affect the value of the impact load.

Heart Composite Material Model for Stress-Strain Analysis

2003 ◽  
Author(s):  
Zhenhua Hu ◽  
Dimitris Metaxas ◽  
Leon Axel
Keyword(s):  
Fiber Orientation ◽  
Strain Energy ◽  
Strain Analysis ◽  
Material Model ◽  
Time Step ◽  
Stress Strain ◽  
Energy Functions ◽  
Strain Energy Functions

Mechanical properties of the myocardium have been investigated intensively in the past four decades. Due to the non-linearity and history dependence of myocardial deformation, many complex strain energy functions have been used to describe the stress-strain relationship in the myocardium. These functions are good at fitting in-vitro experimental data from myocardial stretch testing into strain energy functions. However, it is difficult to model in-vivo myocardium by using strain energy functions. In a previous paper [1], we have implemented a transversely anisotropic material model to estimate in-vivo strain and stress in the myocardium. In this work, the fiber orientation is updated at each time step from the end of diastole to the end of systole; the stiffness matrix is recalculated using the current fiber orientation. We also extend our model to include residual ventricular stresses and time-dependent blood pressure in the ventricular cavities.

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