scholarly journals 3-DIMENTIONAL MODELING OF CYLINDRICAL CONCRETE UNDER AXIAL COMPRESSION WITH VARIATIONS OF MESH ELEMENT TECHNIC AND EFFECT OF REDUCED INTEGRATION

2021 ◽  
Vol 25 (1) ◽  
pp. 49
Author(s):  
I Gede Gegiranang Wiryadi
Keyword(s):  
Peak Load ◽  
Plastic Behavior ◽  
Load Effect ◽  
Reduced Integration ◽  
Concrete Damage ◽  
Integration Effect ◽  
Hourglass Control ◽  
Element Technique ◽  
Control Modeling

Research with numerical methods using computer programs has increased in recent years in various fields including the field of structural materials. However, this numerical analysis still needs to be developed in terms of modeling techniques in order to get the results according to the real condition. In this paper, modeling of concrete-cylinder with numerically method using a finite element based computer program, Abaqus®, presented.. Modeling technique to inventigate the mesh element technique and the reduced integration on hourglass control. Modeling specimen is in the form of cylindrical concrete measuring 150 mm x 300 mm with a quality of 25 MPa. Concrete plastic behavior is modeled with the concrete damage plasticity (CDP) feature. The results of the analysis show that the reduction-integration of hourglass control gives a lower peak load effect when the material passes the elastic limit. Meanwhile, a better mesh technique is to use 8-noded hexahedral because it is more stable and the reduction-integration effect of hourglass control can work.

scholarly journals Influences of Residual Stress, Surface Roughness and Peak-Load on Micro-Cracking: Sensitivity Analysis

Metals ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 320
Author(s):  
Jairan Nafar Dastgerdi ◽  
Fariborz Sheibanian ◽  
Heikki Remes ◽  
Hossein Hosseini Toudeshky
Keyword(s):  
Residual Stress ◽  
Surface Roughness ◽  
Crack Formation ◽  
Peak Load ◽  
Crack Size ◽  
Effective Parameters ◽  
Load Range ◽  
Load Effect ◽  
Damage Initiation ◽  
Load Conditions

This paper provides further understanding of the peak load effect on micro-crack formation and residual stress relaxation. Comprehensive numerical simulations using the finite element method are applied to simultaneously take into account the effect of the surface roughness and residual stresses on the crack formation in sandblasted S690 high-strength steel surface under peak load conditions. A ductile fracture criterion is introduced for the prediction of damage initiation and evolution. This study specifically investigates the influences of compressive peak load, effective parameters on fracture locus, surface roughness, and residual stress on damage mechanism and formed crack size. The results indicate that under peak load conditions, surface roughness has a far more important influence on micro-crack formation than residual stress. Moreover, it is shown that the effect of peak load range on damage formation and crack size is significantly higher than the influence of residual stress. It is found that the crack size develops exponentially with increasing peak load magnitudes.

Shelf Life Extension, Safety, and Quality of Fresh Pork Loin Treated with High Hydrostatic Pressure

1998 ◽  
Vol 61 (12) ◽  
pp. 1649-1656 ◽  
Author(s):  
VIDYA ANANTH ◽  
JAMES S. DICKSON ◽  
DENNIS G. OLSON ◽  
ELSA A. MURANO
Keyword(s):  
Shelf Life ◽  
Descriptive Analysis ◽  
Peak Load ◽  
Storage Period ◽  
Life Extension ◽  
Processing Temperature ◽  
Optimal Conditions ◽  
Pressure Time ◽  
Pork Loin

The optimal conditions of pressure, time, and processing temperature required to eliminate Listeria monocytogenes Scott A and Salmonella typhimurium ATCC 13311 in fresh pork loin and the effect of these optimal conditions on quality and shelf life were determined. Twenty-five grams of fresh pork loin were inoculated with either of the two organisms and were subjected to pressures between 414 and 827 MPa at either 2 or 25°C for 30 min. The was determined to be 2.17 min for L. monocytogenes and the was determined to be 1.48 min for S. typhimurium. Samples subjected to a 6D process were evaluated by sensory and objective tests as well as for shelf life. These samples were found to be different (P < 0.05) from controls when evaluated after cooking by a triangle test of difference, but only when the pressure was applied at 2°C and not at 25°C. The descriptive analysis test showed that cooked samples treated at 25°C were not different (P > 0.05) from controls in flavor, juiciness, and firmness. Color, peak load, water-holding capacity, and moisture were not found to be different (P > 0.05) between samples treated at 25°C and controls when both were cooked. However, in the raw state, differences were found in the values for color parameters L and b. The level of psychrotrophs was 5.7 log CFU/g for samples treated at 25°C after 33 days of storage at 4°C, as compared with 7.0 log CFU/g for controls. The color and peak load (texture) did not change over the storage period (P > 0.05) in any of the samples. All samples spoiled in 5 days when stored at 25°C.

scholarly journals Design and Analysis of Disc Brake using ANSYS

2019 ◽  
Vol 8 (4) ◽  
pp. 10468-10470
Keyword(s):  
Friction Material ◽  
Heat Fluxes ◽  
Disc Brake ◽  
Pressurized Water ◽  
Flow Rates ◽  
Brake Rotor ◽  
Solid Works ◽  
Element Technique ◽  
Two Sides

Braking is a procedure that changes over the kinetic vitality of a vehicle into mechanical vitality, which must dissipate heat. A brake plate generally made of cast iron or clay composites is connected to the wheel. The friction material of brakes (i.e) brake cushions is upheld precisely by using pressurized water, pneumatically or electromagnetically to the two sides of the plate which holds the wheel. The present examination basically manages the modeling and breaking down a ventilated circle brake by Solid works and ANSYS. FE models of the brake are molded with solid works and reproduced by utilizing ANSYS which depends on the finite element technique (FEM). This thermal investigation is done as such as to get the quality of the brake. The suitable design is found and heat flow rates and heat fluxes in the thermal examination, are considered by fluctuating the cross segments and materials of the disc brake rotor

scholarly journals Experimental Laboratory Testing on Behavior of Dowels in Concrete Pavements

Materials ◽  
2020 ◽  
Vol 13 (10) ◽  
pp. 2343
Author(s):  
Andrea Zuzulova ◽  
Jiri Grosek ◽  
Michal Janku
Keyword(s):  
Slovak Republic ◽  
Experimental Tests ◽  
Concrete Pavements ◽  
The Czech Republic ◽  
Alternative Materials ◽  
Concrete Damage ◽  
Experimental Laboratory ◽  
And Behavior ◽  
Potential Use

This paper describes the testing of effectiveness and behavior of dowels placed in transversal joints of concrete pavements, while focusing on dimensions and quality of commonly used materials. The analysis uses experimental tests in laboratory conditions which were performed independently in the Czech Republic and Slovak Republic. The comparison of quality as well as potential use of alternative materials of dowels is made with the use of developed tests focusing on main requirements, such as longitudinal displacement in cement concrete, resistance of coating to damage, and reduced potential to concrete damage. Furthermore, the paper describes and compares loading results of the relative concrete deformations around dowels by strain gauges that were analyzed. Results of deformations on beams with an inserted dowel and the findings that were observed during the measurement are presented.

scholarly journals Passive Method for Estimating Available Throughput for Autonomous Off-Peak Data Transfer

2020 ◽  
Vol 2020 ◽  
pp. 1-12 ◽  
Author(s):  
Kozo Satoda ◽  
Eiji Takahashi ◽  
Takeo Onishi ◽  
Takayuki Suzuki ◽  
Daisuke Ohta ◽  
...  
Keyword(s):  
Mobile Networks ◽  
Data Transfer ◽  
Peak Load ◽  
Base Station ◽  
Base Stations ◽  
Recent Analysis ◽  
Data Traffic ◽  
End User ◽  
Lte Networks

Large demands for mobile traffic subject base stations to frequent short-term and sharp peak loads. Recent analysis of data traffic on commercial mobile networks reported that the traffic peaks can be reduced by an average of 40% without compromising the quality of experience provided to the end user, if a peak load can be shifted for at most 20 s. To reduce peak traffic, we previously proposed a method for off-peak data transfer, with which user equipment (UE) autonomously delays receiving data, and a peak load on a base station can be shifted. In terms of off-peak transfer of data, a significant problem is determining how each UE estimates available throughput. In this paper we propose a method of passively estimating available throughput of each UE. We evaluated the effectiveness of the proposed method through experiments on experimental and commercial LTE networks. The results indicate that our method obtains more than a 0.7 correlation between actual available throughput and estimated throughput.

Modeling the Crushing Response of PMC Tubes Under Quasi-Static and Dynamic Loading Conditions

2002 ◽  
Author(s):  
M. Abdel-Haq ◽  
G. Newaz
Keyword(s):  
Finite Element ◽  
Energy Absorption ◽  
Failure Modes ◽  
Peak Load ◽  
Finite Element Models ◽  
Failure Model ◽  
Axial Splitting ◽  
Element Technique ◽  
Dynamic Loading Conditions ◽  
Static And Dynamic Loading

Non-linear finite element technique was used to predict the crushing response and energy absorption of fiberglass/polyester tubes under quasi-static and dynamic conditions. The major failure modes including axial splitting of the tube wall and delamination were modeled using the available features in LSDYNA and ABAQUS codes for dynamic and quasi-static analysis, respectively. The results show that the finite element models were able to predict the average and peak load levels for the tubes with and without using an external constraint. Finally, it was concluded that modeling the major failure modes in the crushing process in addition to using an appropriate material failure model is essential to capture the load levels and specific energy absorption of the crushed tubes.

scholarly journals STUDI POWER QUALITY DI BALAI LATIHAN PENDIDIKAN TEKNIK (BLPT) YOGYAKARTA

2020 ◽  
Vol 3 (2) ◽  
Author(s):  
Alex Sandria Jaya Wardhana
Keyword(s):  
Power Quality ◽  
Reactive Power ◽  
Electrical Power ◽  
Peak Load ◽  
Current Voltage ◽  
Quality Profile ◽  
Measurement Results ◽  
Power Frequency ◽  
Voltage Harmonics

The quality of electrical power is a common condition that describes the characteristics of the parameters of electrical quantities. This study aims to determine the power quality profile that includes current, voltage, active power , reactive power , apparent power, frequency , harmonic current and voltage harmonics. Power quality profile is done by measuring for 24 hours to determine the characteristic qualities of the object of research in Balai Latihan Pendidikan Teknik (BLPT) Yogyakarta. Measurements were taken at each of output transformer 250 kVA at BLPT Yogyakarta . Based on the measurement results , the total peak load for loading in BLPT Yogyakarta is 129.242,45 VA or equal to 51.70% of the installed transformer capacity. The most prominent conditions of measurement results are any indication of the current flow in the neutral wire is high enough, ie 103,05 amperes, which will impact on the value of the energy loss in the neutral wire and losses in the transformer.

Home Load-Side Management in Smart Grids Using Global Optimization

2019 ◽  
pp. 127-161
Author(s):  
Abdelmadjid Recioui
Keyword(s):  
Smart Grids ◽  
Energy Use ◽  
Peak Load ◽  
Computational Cost ◽  
Demand Side Management ◽  
Demand Side ◽  
Demand And Supply ◽  
Management Techniques ◽  
Increasing Demand

Demand-side management (DSM) is a strategy enabling the power supplying companies to effectively manage the increasing demand for electricity and the quality of the supplied power. The main objectives of DSM programs are to improve the financial performance and customer relations. The idea is to encourage the consumer to use less energy during peak hours, or to move the time of energy use to off-peak times. The DSM controls the match between the demand and supply of electricity. Another objective of DSM is to maintain the power quality in order to level the load curves. In this chapter, a genetic algorithm is used in conjunction with demand-side management techniques to find the optimal scheduling of energy consumption inside N buildings in a neighborhood. The issue is formulated as multi-objective optimization problem aiming at reducing the peak load as well as minimizing the energy cost. The simulations reveal that the adopted strategy is able to plan the daily energy consumptions of a great number of electrical devices with good performance in terms of computational cost.

The applicability of analytical elasto-plastic solutions and issues of the formation of shear bands zones

2020 ◽  
Author(s):  
Elena Grishko ◽  
Artyom Myasnikov ◽  
Denis Sabitov ◽  
Yuri Podladchikov ◽  
Aboozar Garavand
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Analytical Solutions ◽  
Applied Mathematics ◽  
Shear Bands ◽  
Wellbore Stability ◽  
Plastic Behavior ◽  
Frictional Material ◽  
Support Of Research ◽  
Element Technique

<p><strong>Key Words:</strong> numerical modelling, elasto-plastic analytical solutions, shear bands, geomechanics.</p><p>The correct analysis of wellbore stability in unconventional reservoirs receives much interest from the industry as shale rock and tar sands demonstrate perceptible plastic behavior which influences the estimation of rock failure. To tackle this problem the 3D finite element code has been developed for computing the stress-strain state in the elastoplastic medium near a borehole. The accuracy of the results, obtained due to the application of the finite element technique, can be affected by various numerical effects. Since the theory of plasticity assumes infinitesimal load increments, errors associated with finite increments are almost inevitable. The accuracy of the numerical solution can be verified by comparing the numerical results with the analytical solutions. Elasto-plastic analytical solutions [1], [2] stand out among others because they are the only ones among many others, mentioned in the cited monographs, that consider analytical solutions under conditions of non-hydrostatic loading.</p><p>In this study, the numerical and analytical solutions were verified and relative errors were calculated for different loading paths. It turned out, for example, that Galin’s analytical solution works well not only in the field of its applicability, but also outside of it, despite different errors. This work discusses questions related to the influence of the increment of the applied load on the structure of a stationary elasto-plastic solution, including in the case of the formation of zones of localized plastic deformation. The issue of the appearance of shear bands zones is also considered: these bands develop directly around the hole under certain boundary conditions or gradually grow out of the zones of elliptical plastic deformation.</p><p>The first, third and fifth authors acknowledge support of research by Geosteering technologies company within the scope of Geonaft project sponsored by Skolkovo foundation, Russia.</p><p>The second and fourth authors acknowledge support of research by Government of Russian Federation under grant 2019-220-07-9139.</p><p><strong>REFERENCES</strong></p><p>[1] Detournay, E. (1986). An approximate statical solution of the elastoplastic interface for the problem of Galin with a cohesive-frictional material. International Journal of Solids and Structures, 22(12), 1435–1454.</p><p>[2] Galin, L.A. (1946). Plane elastoplastic problem. Applied Mathematics and Mechanics, 10 (3), 365–386.</p>

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