Numerical Analysis of Additional Stresses in Railway Track Elements Due to Subgrade Settlement Using FEM Simulation

Ramadan, Ahmed Nabil; Jing, Peng; Zhang, Jinxi; Zohny, Haytham N.

doi:10.3390/app11188501

Cited by 10 publications

(7 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The finite element (FE) method is a numerical technique used to analyze various engineering problems [28][29][30][31]. This technique separates a large system into smaller and simpler parts, called finite elements.…”

Section: Mesh Generation Using the Finite Element Methodsmentioning

confidence: 99%

Skull Thickness Calculation Using Thermal Analysis and Finite Elements

et al. 2021

View full text Add to dashboard Cite

In this study, the skull bone thicknesses of 150 patients ranging in age from 0 to 72 years were calculated using a novel approach (thermal analysis), and thickness changes were analyzed. Unlike conventional thickness calculation approaches (Beam Propagation, Hildebrand), a novel heat transfer-based approach was developed. Firstly, solid 3D objects with different thicknesses were modeled, and thermal analyses were performed on these models. To better understand the heat transfer of 3D object models, finite element models (FEM) of the human head have been reported in the literature. The FEM can more accurately model the complex geometry of a 3D human head model. Then, thermal analysis was performed on human skulls using the same methods. Thus, the skull bone thicknesses at different ages and in different genders from region to region were determined. The skull model was transferred to ANSYS, and it was meshed using different mapping parameters. The heat transfer results were determined by applying different heat values to the inner and outer surfaces of the skull mesh structure. Thus, the average thicknesses of skull regions belonging to a certain age group were obtained. With this developed method, it was observed that the temperature value applied to the skull was proportional to the thickness value. The average thickness of skull bones for men (frontal: 7.8 mm; parietal: 9.6 mm; occipital: 10.1 mm; temporal: 6 mm) and women (frontal: 8.6 mm; parietal: 10.1 mm; occipital: 10 mm; temporal: 6 mm) are given. The difference (10%) between men and women appears to be statistically significant only for frontal bone thickness. Thanks to the developed method, bone thickness information at any desired point on the skull can be obtained numerically. Therefore, the proposed method can be used to help pre-operative planning of surgical procedures.

show abstract

Section: Mesh Generation Using the Finite Element Methodsmentioning

confidence: 99%

Skull Thickness Calculation Using Thermal Analysis and Finite Elements

et al. 2021

View full text Add to dashboard Cite

show abstract

“…The second la the subgrade-simulates a layer of infinite thickness. In this case, a thickness of 15 was selected, due to the research already carried out in this area published in se publications, e.g., [30,31] For the recording of the individual pulses, a single-axis sensor IEPE A/140/SC and a PULSE measurement system by Brüel & Kjaer [28] were used. It is a sophisticated system designed to measure and evaluate vibrations propagating from different vibration sources.…”

Section: Computational Model Of the Experimental Standmentioning

confidence: 99%

Experimental Monitoring of Dynamic Parameters of the Sub-Ballast Layers as a Prerequisite for a High-Quality and Sustainable Railway Line

Ižvolt,

Dobeš,

Papánová

et al. 2024

Sustainability

View full text Add to dashboard Cite

Monitoring dynamic load transfer from train traffic to sub-ballast layers is crucial for verifying the reliability and safety of railway lines, assessing the design cost-effectiveness and achieving minimum environmental impact. For this purpose, measurements in labs, in situ or modeling the influence of dynamic loads on the immediate and long-term roadway quality are often performed using suitable software. The available test sections enabled monitoring of the dynamic loads and optimizing the critical spots where increased dynamic effects from railway traffic may occur. The subject of this paper is the calibration of the sensors installed in the different test sections of the trans-European corridor number V. As a result, the necessary input parameters for the subsequent numerical modeling of the dynamic effects on the track substructure and vibration propagation on the available sections of the upgraded railway line were obtained. The sensor calibration was carried out on the experimental field, part of the Experimental Basis of the Department of Railway Engineering and Track Management. As part of the calibration, the sensitivity of the sensors embedded in the track bed to the applied dynamic loads resulting from the impact effects of the lightweight deflectometer was assessed. The result of the calibration was the demonstration of sufficient sensitivity of the sensors and their suitability for implementation in an actual railway track structure, with the aim of obtaining relevant values of the response of the sub-ballast layers to dynamic loads and assessing the operational impacts on the sustainable environment. Also, the main result of the research was the possibility of using the theoretical–experimental route to optimize the layers of the railway body.

show abstract

“…The authors obtained relevant insights regarding vertical strains and tensile forces in geogrid and ballast settlement and justified that the method is convenient and economical for this purpose. Ramadan et al [27] evaluated the influence of subgrade settlement on stresses for different loads and boundary condition scenarios. All of these mentioned works could reproduce different railway structural problems through the simplification of 2D plane strain FEM numerical models, as well as achieving important and accurate results.…”

Section: Introductionmentioning

confidence: 99%

Evaluating Different Track Sub-Ballast Solutions Considering Traffic Loads and Sustainability

Castro,

Saico,

de Moura

et al. 2024

Infrastructures

View full text Add to dashboard Cite

The railway industry is seeking high-performance and sustainable solutions for sub-ballast materials, particularly in light of increasing cargo transport demands and climate events. The meticulous design and construction of track bed geomaterials play a crucial role in ensuring an extended track service life. The global push for sustainability has prompted the evaluation of recycling ballast waste within the railway sector, aiming to mitigate environmental contamination, reduce the consumption of natural resources, and lower costs. This study explores materials for application and compaction using a formation rehabilitation machine equipped with an integrated ballast recycling system designed for heavy haul railways. Two recycled ballast-stabilised soil materials underwent investigation, meeting the necessary grain size distribution for the proper compaction and structural conditions. One utilised a low-bearing-capacity silty sand soil stabilised with recycled ballast fouled waste (RFBW) with iron ore at a 3:7 weight ratio, while the second was stabilised with 3% cement. Laboratory tests were conducted to assess their physical, chemical, and mechanical properties, and a non-linear elastic finite element numerical model was developed to evaluate the potential of these alternative solutions for railway sub-ballast. The findings indicate the significant potential of using soils stabilised with recycled fouled ballast as sub-ballast for heavy haul tracks, underscoring the advantages of adopting sustainable sub-ballast solutions through the reuse of crushed deteriorated ballast material.

show abstract

Numerical Analysis of Additional Stresses in Railway Track Elements Due to Subgrade Settlement Using FEM Simulation

Cited by 10 publications

References 32 publications

Skull Thickness Calculation Using Thermal Analysis and Finite Elements

Skull Thickness Calculation Using Thermal Analysis and Finite Elements

Experimental Monitoring of Dynamic Parameters of the Sub-Ballast Layers as a Prerequisite for a High-Quality and Sustainable Railway Line

Evaluating Different Track Sub-Ballast Solutions Considering Traffic Loads and Sustainability

Contact Info

Product

Resources

About