Article
Mechanics
Paul Koenig, Patrick Salcher, Christoph Adam, Benjamin Hirzinger
Summary: This paper introduces a new semi-analytical approach for analyzing the dynamic response of railway bridges under high-speed trains. The coupling of bridge and track models is achieved through complex modal expansion and component mode synthesis, demonstrating the influence of soil-structure interaction and track subsystem on dynamic response.
Article
Construction & Building Technology
Amin Khajehdezfuly, Davood Poorveis, Amir Mohammad Amiri
Summary: This research developed a numerical model and a MATLAB code to investigate the effects of rail-pad and interlayer stiffness on the flexibility and fatigue life of railway concrete slab track. The findings show that reducing rail-pad stiffness and increasing interlayer stiffness can simultaneously improve the flexibility and fatigue life.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Construction & Building Technology
Mohammad Siahkouhi, Junyi Wang, Xiaodong Han, Peyman Aela, Yi-Qing Ni, Guoqing Jing
Summary: Health monitoring of railway tracks is becoming increasingly important, and a new method using carbon nanotubes as a functional filler to provide self-sensing properties for railway sleepers has been proposed. Experimental results show that the sensitivity of the specimens with 0.5% and 0.75% CNT is the highest, with respective values of 0.043 and 0.036 10-6.N-1.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Polymer Science
Choman Salih, Allan Manalo, Wahid Ferdous, Rajab Abousnina, Peng Yu, Tom Heyer, Peter Schubel
Summary: A new five-point bending test method was developed to evaluate the flexural behavior of alternative railway sleeper technologies. The test results can precisely predict the bending behavior of the sleepers. The most suitable material for the middle support was also determined based on the different modulus of elasticities of the sleepers.
Article
Engineering, Civil
H. D. Phadke, O. R. Jaiswal
Summary: This study investigates the dynamic response of an infinite railway track under the action of a harmonic moving load, considering the variable foundation stiffness along the track length. The combined influence of frequencies of moving load and spatial frequency of foundation stiffness variation is explored. The results show that wavelength and amplitude of stiffness variation significantly affect the dynamic properties of the system.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART F-JOURNAL OF RAIL AND RAPID TRANSIT
(2022)
Article
Engineering, Civil
Zhenwei Xiong, Jianxing Liu, Ping Wang, Ganzhong Liu, Jieling Xiao, Sixin Yu
Summary: The study compared the dynamic performances of a polyurethane-reinforced ballast bed and an unreinforced ballast bed using impact excitation technique, focusing on their influence on natural frequency and vibration transmission characteristics. The results showed that the polyurethane-reinforced ballast bed decreased rail vibration in the lower frequency range but increased it in the higher range, while significantly increasing sleeper vibration frequencies. As the frequency increased, the polyurethane track structure transitioned from flexible to rigid, absorbing and dissipating impact load, thus damping vibration in the range of 90-470 Hz.
JOURNAL OF CIVIL STRUCTURAL HEALTH MONITORING
(2021)
Article
Engineering, Civil
Wahid Ferdous, Allan Manalo, Omar AlAjarmeh, Ali A. Mohammed, Choman Salih, Peng Yu, Mojdeh Mehrinejad Khotbehsara, Peter Schubel
Summary: This study proposed three new railway sleeper concepts and evaluated them experimentally and numerically. The results show that these new concepts have the potential to replace traditional wooden railway sleepers in terms of structural performance and commercial viability.
ENGINEERING STRUCTURES
(2021)
Review
Engineering, Civil
Angie C. Lamprea-Pineda, David P. Connolly, Mohammed F. M. Hussein
Summary: This paper presents a technical review of the widely employed beam on elastic foundation theory in studying railway track behavior and explores recent advancements in the field. It discusses various modeling strategies and solution methods for computing track behavior, including considerations for train-track and track-ground interaction. Benchmark solutions for three common problem types are also provided.
TRANSPORTATION GEOTECHNICS
(2022)
Article
Multidisciplinary Sciences
Xianxian Yin, Xiukun Wei, Haichao Zheng
Summary: This paper proposes an intelligent method based on axle-box vibration acceleration and deep learning network to detect fastener defects in railway tracks. By investigating the dynamic relationship between fastener defects and axle-box vibration acceleration, and building a defect recognition network, this method achieves effective classification of fastener defects.
ADVANCED THEORY AND SIMULATIONS
(2022)
Article
Metallurgy & Metallurgical Engineering
Jian Yu, Li-zhong Jiang, Wang-bao Zhou, Xiang Liu
Summary: Railway transportation plays a crucial role in earthquake mitigation and post-earthquake reconstruction. This research focuses on track irregularities caused by earthquakes and proposes a target seismic residual track irregularity based on the distribution mode analysis, along with calculating the driving speed threshold after earthquakes. The findings indicate that transverse earthquakes lead to noticeable alignment irregularities in rails, with smaller amplitudes in vertical irregularities. The distribution mode of alignment irregularities can be categorized into unimodal and bimodal, with the latter showing significantly smaller amplitudes and vehicle responses. It is found that when the peak acceleration of transverse earthquakes is less than 0.25g, no deceleration is needed, while a moderate deceleration is required when it exceeds 0.25g to ensure comfort.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2023)
Article
Engineering, Civil
Chen Yan-fei, Zang Zhi-peng, Dong Shao-hua, Ao Chuan, Liu Hao, Ma Shang, Hou Fu-heng, Feng Wei
Summary: The flapwise bending vibrational equations of tapered Rayleigh beam were derived using Hamilton's principle and investigated using VIM. The study focused on the vibrational characteristics of rotating tapered Rayleigh beams under different conditions, and results showed that VIM can efficiently and accurately yield precise results.
CHINA OCEAN ENGINEERING
(2021)
Review
Acoustics
Lokanna Hoskoti, Shakti S. Gupta, Mahesh M. Sucheendran
Summary: This paper reviews different modeling approaches for the geometrical or centrifugal stiffening of beams due to rotation. The longitudinal displacement of the beam consists of three components: axial displacement, rotation-induced displacement, and displacement due to foreshortening effect. Nonlinear strain-displacement relations are used to model geometrical stiffening, resulting in nonlinear equations of motion. Various nonlinear models and their solution procedures are discussed based on different approximations of the strain-displacement relation. The applicability of these models is tested, and the impact of geometric properties on the modal characteristics is analyzed.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
Qiang Yi, Caiyou Zhao, Ping Wang
Summary: The study utilizes the Floquet transform method and supercell technology to analyze defect states and the propagation characteristics of elastic waves in periodic track structures. The presence of defects disrupts the periodicity of the structure, leading to the formation of multiple defect states and enhancing vibration in neighboring structures.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2022)
Article
Multidisciplinary Sciences
Mohd Iqbal, Anil Kumar, Mahesh Murugan Jaya, Oreste Salvatore Bursi
Summary: This paper explores the unique band gap characteristics of periodic structures in vibro-acoustic filters, and their application in vibration control of railway tracks. The study includes the design of tuned mass dampers with different mass ratios, investigation of the influence of damping on band gap characteristics, and the potential use of lateral distributed resonators for vibration control.
SCIENTIFIC REPORTS
(2021)
Article
Construction & Building Technology
Linchang Miao, Lijian Lei, Chao Li, Haizhong Zheng, Zhendong Qian
Summary: A new phononic-like crystal metaconcrete material was developed to decrease vibrations induced by trains in subway engineering. The optimization of the original phononic-like crystal model improved the vibration reduction effect for low-frequency bandgaps. The metaconcrete track beds, based on the new model, were installed and monitored in the Ning-Ju line of Nanjing Metro, showing excellent vibration reduction performance for rail transportation.
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
(2023)
Article
Mechanics
Alireza Enferadi, Majid Baniassadi, Mostafa Baghani
Summary: This study presents the design and analysis of an SMP microvalve, where the thermomechanical response of the SMP is investigated using a nonlinear constitutive model that incorporates hyperelasticity and viscoelasticity. The model accounts for fluid-solid interaction and heat transfer in both fluid and solid physics. Numerical simulations are carried out to examine the important characteristics of the SMP valve. The results demonstrate the significance of employing fluid-solid interaction conjugated heat transfer analysis for the efficient development of microvalves in diverse applications.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Hridya P. Lal, B. R. Abhiram, Debraj Ghosh
Summary: Higher-order elasticity theories are used to model mechanics at the nanoscale, but the length-scale parameters in these theories need to be evaluated through experiments or MD simulations. This study shows that the length-scale parameter in the modified strain gradient theory varies with dimensions, boundary conditions, and deformation level for carbon and boron nitride nanotubes. To address this issue, a supervised ML-based framework is developed, combining MD simulations, continuum formulation, and ML to predict the length-scale parameter for a given material, dimension, and boundary condition. This predictive tool reduces the need for expensive MD simulations and opens up possibilities for applying non-classical continuum theories to nanoscale mechanics problems.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Geng Chen, Shengzhen Xin, Lele Zhang, Min Chen, Christian Gebhardt
Summary: This paper develops a multiscale numerical approach to predict the failure probability of additive manufacturing (AM) structures subjected to time-varied loadings. The approach combines statistical homogenization, shakedown analyses, and reliability methods to consider the influence of microstructural features on load bearing capacity. Through case studies on exemplary structures and different material randomness assumptions, the robustness of the results is confirmed and the mechanism of how micropores influence structural reliability is explained.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Guillaume Cadet, Manuel Paredes
Summary: This study proposes a comprehensive solution for calculating the stress field on the surface of a curved beam with a circular cross section, which is crucial for probabilistic fatigue life analysis.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Hongshi Ruan, Xiaozhe Ju, Junjun Chen, Lihua Liang, Yangjian Xu
Summary: This paper proposes a data-driven approach to improve the efficiency of computational homogenization for nonlinear hyperelastic materials. By combining clustering analysis, Proper Orthogonal Decomposition (POD), and efficient sampling, a reduced order model is established to accurately predict elastoplasticity under monotonic loadings. The numerical results show a significant acceleration factor compared to a purely POD-based model, which greatly improves the applicability for structural analysis.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Pep Espanol, Mark Thachuk, J. A. de la Torre
Summary: The motion of a rigid body, described by Euler's equations in Classical Mechanics, assumes that the distances between constituent particles are fixed. However, real bodies cannot meet this assumption due to thermal fluctuations. In order to incorporate dissipative and thermal fluctuation effects into the description, a generalization of Euler's equations is proposed. This theory explains the origin of these effects as internal, rather than caused by an external thermal bath, and derives the stochastic differential equations governing the body's orientation and central moments.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Prateek Chandrakar, Narayan Sharma, Dipak Kumar Maiti
Summary: The current study focuses on the deterioration in thermal buckling performance of variable angle tow laminated (VATL) plates caused by damages in various composite and damage characteristics. Through numerical simulations and surrogate models, it was found that damages reduce the sensitivity of composite properties to buckling response, and a distinctive pattern of buckling response was observed when composite properties vary.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Liangteng Guo, Shaoyu Zhao, Jie Yang, Sritawat Kitipornchai
Summary: This study introduces composites reinforced with graphene origami nanofillers into functionally graded multilayered phononic crystals. Numerical investigations reveal that these materials possess negative Poisson's ratio and offer unique mechanical properties, which can be tuned by adjusting the weight fraction and hydrogen coverage of the graphene fillers.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Kai Li, Haiyang Wu, Yufeng Liu, Yuntong Dai, Yong Yu
Summary: This paper presents a novel self-oscillating liquid crystal elastomer fiber-beam system that can sway continuously and periodically under steady illumination. The governing equations of the system are established and the self-swaying process and motion mechanism are described in detail. Numerical results show the system undergoes supercritical Hopf bifurcation and the effects of system parameters on the self-swaying amplitude and frequency are discussed quantitatively.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Lingkang Zhao, Peijun Wei, Yueqiu Li
Summary: This paper proposes a spatial-temporal fractional order model to study the dynamic behavior of thermoelastic nanoplates in a thermal environment. The model provides a flexible approach to describe the small-scale effects and complex history-dependent effects. Analytical and numerical methods verify the reliability of the model, and the effects of parameters on the dynamic response are discussed.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
A. N. O'Connor, P. G. Mongan, N. P. O'Dowd
Summary: This research presents an autonomous framework that combines Bayesian optimization and finite element analysis to identify ductile damage model parameters. The framework has been successfully applied to P91 material datasets and demonstrates the impact of algorithm hyperparameters on the resulting non-unique ductile damage parameters.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
S. V. Sorokin, S. Lenci
Summary: This paper reconsiders the nonlinear coupling between flexural and longitudinal vibrations of ideally straight elastic beams, using a nonlinear theory of curved beams and employing class-consistent boundary conditions. A paradoxical difference in the nonlinear parts of the Duffing equations obtained in the limit of vanishing curvature and in the case of an ideally straight beam is demonstrated and explained.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
C. Hari Manoj Simha
Summary: Dynamic Mode Decomposition (DMD) can be used to construct deformation fields for linear solids without making constitutive assumptions or knowing material properties. It operates on time-shifted data matrices and selects dominant modes using singular value decomposition. DMD can be used for reconstructing displacement states in elastic solids and identifying the onset of plasticity in elastic-plastic solids.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
C. Ren, K. F. Wang, B. L. Wang
Summary: An electromechanical model is established to investigate the characteristics of a bilayer structure consisting of a piezoelectric semiconductor film and an elastic substrate. The combined effects of piezoelectricity and flexoelectricity are considered, and closed-form expressions for the distributions of electron concentrations and relevant electromechanical fields are obtained. The effects of interfacial parameter, flexoelectricity, and initial carrier concentration are discussed. The research highlights the importance of the interfacial parameter and the weakening effect of flexoelectricity on the imperfect interface of the bilayer system.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)
Article
Mechanics
Yu Sun, Qiang Han, Chunlei Li
Summary: This paper presents the design of a tunable functionally graded metamaterial beam for flexural wave attenuation through the integration of a piezomagnetic shunt damping system and an inertial amplification mechanism. The proposed system demonstrates tunable and strong wave attenuation capability through local resonance and energy consumption. The theoretical and numerical results verify that the system can achieve significant wave attenuation at defined frequencies and also be optimized for maximal attenuation at various frequency ranges.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2024)