Journals
2025 EN
Sahu Dhaneshwar Prasad · Mohanty Sukesh Chandra
This study explores the flexural behavior and free vibration analysis of sandwich plates including natural fiber-reinforced polymer composite faces and Polyethylene Terephthalate (PET) foam cores under a range of edge situations. ABAQUS is used to do numerical simulations with three-dimensional solid elements (C3D8R). To ascertain the natural frequencies of the plates, experimental procedures such as impact hammer testing and Fast Fourier Transform (FFT) analysis are carried out. The inference of different geometrical parameters on the natural frequencies is investigated through numerical simulation in ABAQUS. The study gives brief outlines regarding the sandwich plates for different engineering applications.
Journals
2025 EN
Prusty Jagesh Kumar · Papazafeiropoulos George · Sahu Dhaneshwar Prasad
+1 more
This article investigates the free vibration and damping characteristics of cylindrical sandwich shells with cutouts using both experimental and numerical approaches. The effects of cutout shape, size, and position on the dynamic response of cylindrical sandwich shells are explored. Moreover, Artificial Neural Network (ANN) models are constructed to predict the dynamic behavior of the sandwich shell with a cutout. A user-friendly application, Sandwich Shell Vibration Analysis (SSVibA), is developed, incorporating the ANN models to predict the non-dimensionalized natural frequencies and modal loss factors of the sandwich shell under different shell geometries, boundary conditions and cutout configurations. The objective of the present research is to advance the understanding of the dynamic behavior of sandwich structures by integrating experimental investigations, numerical analyses, and ANN modeling.
Journals
2025 EN
Prakash S. S. · Prusty J. K. · Das P.
+4 more
The thrust of present research focused on identifying the crack signatures in glass/epoxy laminated composite beams (LCB) through a novel crack-detection technique using buckling data and fuzzy logic. The technique is developed on MATLAB utilizing a hybrid fuzzy inference system (FIS) that combines three membership functions: Gaussian, trapezoidal, and triangular. Critical buckling loads, computed through ABAQUS finite element (FE) simulations, serve as inputs to the FIS. The FIS results show hybridization offer superior accuracy over standalone methods, closely matching the experimental results through INSTRON 8862 Universal Testing Machine (UTM) and presents an effective approach for crack detection in buckling domain.
Journals
2025 EN
Sahu Satish · Rajana Suresh Kumar · Neigapula Venkata Swamy Naidu
+1 more
This article presents a finite element (FE) model using curved isoparametric elements (Q8) to examine the static, stress and free vibration characteristics of laminated composite conoidal shells (LCCS) with displacements fields based on the Carrera Unified Formulation (CUF). CUF not only integrates an equivalent thickness concept with user-defined deformation theory order but also can take up curvature effects in strain displacement fields making it suitable for the analysis of thin and moderately thick LCCS. The study investigates the static and free vibration characteristics of thin and moderately thick LCCS under diverse practical boundary and loading conditions.
Resource
2025 EN
Ghume Prajakta · Sahu Apurva · Gupta Arushi
+2 more
Atrazine (ATZ), also known as 6-chloro-4-N-ethyl-2-N-propan-2-yl-1,3,5-triazine-2,4-diamine, is a common chlorinated triazine herbicide that has caused serious health and environmental concerns due to its persistence and classification as an endocrine-disrupting chemical. Atrazine (ATZ), a widely detected contaminant in drinking water, surface water, soil, and groundwater, has been associated with hormonal imbalances—particularly disrupting the luteinizing hormone (LH) and follicle-stimulating hormone (FSH) axis, which is essential for ovarian function and follicular development. Emerging findings suggest that ATZ may contribute to ovarian dysfunction and potentially accelerate processes associated with premature ovarian insufficiency (POI), characterized by oocyte depletion, diminished ovarian reserve, and hormonal imbalance leading to early infertility. Mechanistically, ATZ disrupts several cellular signaling pathways, including MAPK, TGF-β/Smad, and Nrf2/Keap1, contributing to oxidative stress, apoptosis, granulosa cell dysfunction, and DNA damage. These molecular alterations culminate in impaired folliculogenesis and hormonal instability. Regulatory agencies worldwide, including the WHO, European Union, US EPA, and authorities in Brazil, India, and Argentina, are continually revising atrazine exposure limits in response to increasing evidence of its endocrine-disrupting potential and ecological hazards. This review highlights the known and plausible mechanisms by which ATZ disrupts ovarian function and follicular dynamics, which could be among the contributing factors potentially leading to POI. In light of emerging evidence and global regulatory disparities, it underscores the urgent need for stricter environmental policies, comprehensive toxicological assessments, and mechanistic studies to better evaluate ATZ’s reproductive risks and inform future regulations.
Journals
2025 EN
Singh Ashish Kumar · Pal Anwesha · Sahu Atanu
+1 more
Stiffened functionally graded (FG) folded plates are being widely used these days in aeronautical, automotive, and naval applications which are often exposed to extreme environmental conditions characterized by high temperature and moisture concentrations. However, a numerical model to estimate the dynamic response of such structures in hygrothermal environment is almost non-existent. It is from this perspective that, a MATLAB-based finite element (FE) model is developed to assess the free vibration characteristics of stiffened FG folded panels in hygrothermal environment and is presented for the first time in this article. The governing equation is derived following the first order shear deformation theory including hygro-elastic and thermo-elastic relations. Temperature and moisture concentrations are assumed to vary both linearly and uniformly through the plate’s thickness to numerically simulate hygrothermal environment. Non-linear strains are incorporated in the present FE model to consider the hygrothermal effect. Another FE model is also developed in COMSOL Multiphysics software for these structures and is compared with the MATLAB-based model. Numerical simulations reveal that the free vibration characteristics of stiffened FG folded plates are significantly affected by hygrothermal environment. The present FE models can be effectively utilized by engineers and researchers to analyze and optimize the dynamic behavior of stiffened FG folded plates. The results are also expected to serve as a benchmark for future research works.
Journals
2025 EN
Sahu Dhaneshwar Prasad · Das Ramyaranjan · Mohanty Sukesh Chandra
This study explores the dynamic response of a sandwich beam with isotropic face sheets on a Winkler elastic foundation using finite element (FE) modeling. A MATLAB-based numerical model is developed and validated through various examples. Hamilton’s principle is used to derive the governing equations. The model effectively predicts natural frequencies and loss factors, analyzing the influence of material and geometric properties. Additionally, artificial neural networks (ANNs) with a multilayer perceptron architecture predict the modal parameters. Model accuracy is assessed using R 2 , MAE, and RMSE, confirming the ANN’s reliability in capturing system dynamics. From the analysis, it has been observed that the natural frequency (NF) of the sandwich beam increases as the Winkler elastic foundation constant rises from 0 to 200 kN/m³, with the highest increase observed for the CC boundary condition and the lowest for the CF condition. The loss factor initially increases and then decreases with the same variation in foundation stiffness across all boundary conditions. Also, the parameter ranking reveals that the core thickness ratio and core loss factor most strongly influence the NF and loss factors. Finally, the NF and loss factors predicted by FEM and ANN models closely align, with errors within 5%.
Journals
2025 EN
Sahu Divya · Bajaj Badri
The objective of the study was to examine the mediating effects of psychological capital in the relationship of career calling with psychological well-being and social well-being. This study hypothesized that psychological capital may affect the relationship of career calling with psychological well-being and social well-being. The study was conducted using a sample of 336 higher education teachers in India. The correlation analysis showed a positive relationship among the study variables of career calling, psychological capital, psychological well-being, and social well-being. This study analyzed the relationship of career calling with psychological well-being and social well-being, including the indirect effect of psychological capital. The results showed that psychological capital has partial mediation effects on the relationship of career calling with psychological well-being and social well-being. The findings showed that psychological capital significantly affected the relationships among study variables. The study extends existing literature on career calling, psychological well-being, and social well-being; therefore, it concludes with implications and future directions for research in career calling.
Journals
2025 EN
Bankupalli Phani Teja · Ghosh Subhojit · Sahu Lalit Kumar
+1 more
Effective utilization of Polymer Electrolyte Membrane Fuel Cell (PEMFC) for power electronic applications demands a reliable model with accurate parameter estimation. Existing approaches for modeling the PEMFC using terminal characteristics are based on the assumption of uniform temperature throughout the fuel cell operation. However, stack temperature varies widely for different operating conditions. In this regard, the present work proposes a temperature dependent piecewise modeling approach by dividing the operating range into a set of piecewise regions with different model parameter characterizing each region. To achieve the same, the piecewise regions have been distributed using a fuzzy clustering approach by maintaining a compromise between precise representation of experimental data and reduced model complexity. The parameter estimation for each region is carried out using a novel hybrid optimization approach. The model can quantify the dependence of model parameters on temperature variation. With the temperature-dependent piecewise representation, the proposed model significantly outperforms the conventional uniform temperature model in representing the experimental data by achieving a fitting accuracy of 97.9% at 311 K and 99.8% at 319 K, respectively.
Journals
2025 EN
Sahu Susant Kumar · K Arjun Singh · Natarajan Sendhil Kumar
Utilization of solar energy through concentrated solar power technologies has become a leading technology in today’s world. Among all Concentrated Solar Power system solar parabolic dish collector system is a prominent technology due to its high energy conversion efficiency. In this paper, a double trumpet-shaped secondary reflector for a flat receiver in a dish collector system was proposed. The effect of the new secondary reflector on the flat receiver has been investigated experimentally. The thermal performance of the flat receiver with and without the secondary reflector was evaluated for four consecutive days in each case. A solar paraboloidal dish concentrator with a diameter of 4 m was used for the study. The result indicates that the addition of secondary reflector to the flat receiver increases the stagnation temperature to the maximum of 7.4 and 11.3% at bottom and top surfaces respectively. Likewise, an enhancement in average thermal efficiency of 6.3% was found. Such results have rendered the new flat receiver with secondary reflector an effective one.