Dr. Ramesh Pandey
@mnnit.ac.in
Associate Professor
Director MNNIT Allahabad Prayagraj- Uttar Pradesh
EDUCATION
Ph.D. MNNIT Allahabad Prayagraj
RESEARCH INTERESTS
Smart Composite plate and Structures
Scopus Publications
Scopus Publications
Sajal Kumar Babu Degala, Ravi Prakash Tewari, Pankaj Kamra, Uvanesh Kasiviswanathan, and Ramesh Pandey
Elsevier BV
Divya Pandey, Ramesh Pandey, Ashutosh Mishra, and Ravi Prakash Tewari
Springer Science and Business Media LLC
Dwijendra Dubey, Ashutosh Mishra, Hithesh Chandrakant Shriyan, Tej Pratap, and Ramesh Pandey
Wiley
Elevated battery temperature and its heterogeneity are responsible for many battery‐related problems such as short lifespan and thermal runaway. For longer life and safe functionality of lithium‐ion battery (LIB), both the average battery temperature and temperature heterogeneity must be controlled. The present work analyzes a modified cooling channel design that can control both the average battery temperature and its heterogeneity. The design adopts microtexturing approach for the heat transfer augmentation of the serpentine cooling channels. First, the transient thermal analysis of different geometry of microtextures, viz., microchannels (MCs) and microdimples (MDs), is carried out on an aluminum slab. The rectangular MCs and square MDs are found to be the most efficient among the other considered microtexture geometries. Further, the modified design is employed for a 19‐cell battery pack to analyze the thermal performance, pressure drop, and coolant pump power requirements. A decrease in maximum temperature difference (MTD) by 6.03 % and 3.72% is observed for 380 MCs (rectangular) and 960 MDs (squared), respectively. While MDs improve the temperature homogeneity within the LIBs, the coolant pump power requirement and pressure drop (by ≈15.42%) are higher for it compared to the MC‐based design for a given MTD.
Dwijendra Dubey, A. Mishra, Subrata Ghosh, M.V. Reddy, and Ramesh Pandey
Elsevier BV
Divya Pandey, Ramesh Pandey, and Ravi Prakash Tewari
Begell House
The objective of the present work is to study the influence of process parameters on the mechanical behavior of composite material parts developed by Fused Deposition Modeling (FDM). Carbon-PLA-based composite specimens are used in the present work. Experimental results have shown that with increases in printing temperature from 225°C and 240°C, there is an increase in tensile strength, whereas flexural strength decreases with the temperature rise. The effect of printing orientation is the same on both tensile and flexural strength. Tensile and flexural strengths are higher for flat orientation (0°) than for upright orientation (90°). It is also found that when layer height decreases from 0.3 mm to 0.2 mm, both the tensile and flexural strength increases. The experimental results of the present study signify the importance of Carbon-PLA-based composites for orthotic and prosthetic devices due to their high strength, low cost, and biocompatibility.
Sajal Kumar Babu Degala, Ramesh Pandey, Ashutosh Mishra, Abhishek Kumar Tiwari, and Ravi Prakash Tewari
Springer Nature Switzerland
Jitendra Mehta, Ramesh Pandey, and Ravi Prakash Tewari
Springer Nature Switzerland
Ashwin Pandey, Ankit Prakash, Ramesh Pandey, and Anubhav Rawat
Springer Singapore
Ankit Prakash, Nishant Sati, Piyush Pratap Singh, Sajal K. B. Degala, Anubhav Rawat, Ramesh Pandey, and R.P. Tiwari
IOP Publishing
Abstract The outbreak of SARS-CoV-2, namely Covid-19, one of the greatest pandemics in human history posed some new challenges to the human beings for its prevention and control as it is an airborne respiratory disease and highly contagious. The most common practices suggested by WHO and government of India are; to wear a face mask, keep social distancing etc. It becomes much more important when the whole world is opening its economy. In such situations, there are a number of places where maintaining social distances or wearing a face mask is quite a tough job for example Laboratories and eating messes and canteens of schools and colleges. Thus, the present studies focus on the designing of economic PODS which may be helpful in controlling the spread of airborne disease in mass gathering places like in educational institutions in particular laboratories and eating messes. The present studies first emphasize on the flow field analysis of human cough by assuming it as a turbulent jet using CFD. Then, based on the physical dimensions covered by the coughing jets a further detailed study is conducted on 23 number of PODS of various shapes and sizes using CFD to select a suitable POD so that the effect of coughing in a laboratory/mess can be minimized to contain the infections. A POD with 1 m length and 30 cm height having an arc inside (POD 20) is found to be the best POD to contain the airborne infections.
Sangharsh Kumar Singh, Ramesh Pandey, and Ashutosh Upadhyay
Elsevier BV
Abstract The present work analyzes the crashworthiness characteristics of thin walled tube, by introducing the combination of groove shape. A three combination of groove shape, V shape-Rectangular, Circular-Rectangular, Circular-V shape has been taken for the analysis. These combined grooves shape are introduced at the tube outer wall. A 4, 6 and 8 no of groove specimen for each combined shape are prepared, and effect of no of groove variation is also analyzed. ABAQUS software is used for the numerical analysis of the groove tube and finds the crashworthiness characteristics such as peak load and energy absorption. Load vs displacement curve is analyze for all the groove tube and compare the result from the simple tube. It was seen that combination of groove shape and variation of groove no’s minimizes the shocks and affect the crashworthiness parameter efficiently.
N. Devi, A. Bhar, and R. Pandey
Springer Singapore
Non-uniform rational B-Splines (NURBS) are used in Computer Aided Design (CAD) for many of their desired properties, including ability to accurately model complicated geometries. The newly developed Isogeometric finite element Analysis (IGA) method, based on the use of NURBS basis as the interpolation function, has the potential to revolutionize the industry, by integrating the design and analysis parts. This would otherwise not be possible with the conventional Finite Element Method (FEM) based on polynomial interpolation functions. This paper, presents static analysis of laminated composite plates of arbitrary material configuration using the isogeometric method based on first order as well as a semi refined Higher order Shear Deformation Theory (HSDT). Results from the developed computer program for IGA are compared with those from analytical as well as FE method for different problems with varying parameters and boundary conditions. The accuracy of the results demonstrates the capacity of the developed program for isogeometric analysis of such laminated composite plates.
Sangharsh Kumar Singh, Ashutosh Upadhyay, and Ramesh Pandey
Elsevier BV
Abstract Crashworthiness characteristics of structures which may undergo impact loading is one of the most critical parameters and are important to evaluate in order to ensure minimum structural damage. The present work is focused on to analyze crash-worthiness characteristics of thin-walled tubes numerically through ABAQUS 6.5. The tubes were incorporated with different number of semi-circular grooves on their outer walls. In the computational analysis, the number of grooves is varied as 4, 6 and 8 and its effects on the crashworthiness parameters have been evaluated. Load-displacement curves for different cases have been plotted and parameters such as peak load and energy absorption are calculated and compared with that of a simple thin wall tube. A detailed analysis of the fold formation mechanism for all the tubes has been carried out. It is clearly seen that the crashworthiness characteristics of grooved tubes are much better than that of the simple tube.
G. Bhardwaj, A.K. Upadhyay, R. Pandey, and K.K. Shukla
Elsevier BV
Abstract The paper presents the non-linear flexural and dynamic response of CNT reinforced laminated composite plates using fast converging finite double Chebyshev polynomials. Halpin–Tsai model is used for evaluating the properties of matrix by dispersing CNT in it. Thereafter, CNT reinforced polymer matrix is treated as new matrix and then reinforced with E-Glass fiber in an orthotropic manner. Mathematical formulation of the laminated plate is based on first order shear deformation theory and von-Karman non-linear kinematics. Houbolt time marching scheme and quadratic extrapolation techniques are used for temporal discretization and linearization, respectively. The effects of CNT % and its aspect ratio on the non-linear flexural and dynamic response of the laminated composite plates are presented.
Ramesh Pandey, A. K. Upadhyay, K. K. Shukla, and Anuj Jain
Informa UK Limited
The large amplitude response of elastically supported shear deformable laminated composite plates subjected to uniform step loading in a hygrothermal environment is presented in this article. The problem is formulated utilizing a higher-order shear deformation theory and von-Karman non-linear kinematics. The elastic subgrade is modeled as shear deformable with cubic nonlinearity. The elastic and hygrothermal properties of the fiber composite material are considered to be dependent on temperature and moisture concentration. A fast converging finite double Chebyshev series is used to obtain the semi-analytical solution of nonlinear governing differential equations of motion along with Houbolt time marching scheme and Quadratic extrapolation technique. The effects of plate parameters, foundation parameters (Winkler and Pasternak type), temperature, and moisture on nonlinear dynamic response of laminated composite plates with classical and non-classical boundary conditions are studied.
Sandeep Singh, Kamlesh Kulkarni, Ramesh Pandey, and Harpreet Singh
Emerald
Purpose – The purpose of this paper is to present elastic buckling behaviour of simply supported and clamped thin rectangular isotropic plates having central circular cutouts subjected to uniaxial partial edge compression. Analysis is carried out for four different kinds of partial edge compression and it is extended to study the effect of aspect ratio of plate on buckling load.Design/methodology/approach – A finite element method technique is used in the current work to solve the buckling problem of plate using eight node quadrilateral element and plate kinematics based on first order shear deformation theory. Results obtained from finite element analysis are first validated for isotropic square plates, without cutouts, subjected to uniaxial partial edge compression with some earlier published literature.Findings – From the current work it is concluded that the buckling strength of square plates is highly influenced by partial edge compression, as compared to plate subjected to uniform edge compression; ...
A.K. Upadhyay, Ramesh Pandey, and K.K. Shukla
Elsevier BV
Abstract An analytical solution methodology for the non-linear dynamic displacement response of laminated composite plates subjected to different types of pulse loading is presented. The mathematical formulation is based on third-order shear deformation plate theory and von-Karman non-linear kinematics. Fast-converging finite double Chebyshev series is employed for evaluating the displacement response. Houbolt time marching scheme is used for temporal discretization and quadratic extrapolation technique is used for linearization. The effects of magnitude and duration of the pulse load, boundary conditions and plate parameters on the central displacement and bending moment responses are studied.
Ramesh Pandey, A. K. Upadhyay, and K. K. Shukla
American Society of Civil Engineers (ASCE)
The paper deals with the effect of moisture and temperature on the postbuckling response of a laminated composite plate subjected to hygrothermomechanical loadings. Mechanical loading consists of uniaxial, biaxial, shear, and their combinations. The distribution of temperature and moisture on the surface is considered to be uniform. The degradation in material properties due to moisture and temperature is taken into account using a micromechanical model. The mathematical formulation is based on higher order shear deformation theory and von Karman’s nonlinear kinematics. The quadratic extrapolation technique and fast converging finite double Chebyshev series are used for linearization and spatial discretization of the governing nonlinear equations of equilibrium, respectively. The effects of temperature rise, moisture concentration, fiber-volume fraction, and plate parameters on buckling and postbuckling response of the plate are presented.
A.K. Upadhyay, Ramesh Pandey, and K.K. Shukla
Elsevier BV
Abstract The paper deals with Chebyshev series based analytical solution for the nonlinear flexural response of the elastically supported moderately thick laminated composite rectangular plates subjected to hygro-thermo-mechanical loading. The mathematical formulation is based on higher order shear deformation theory (HSDT) and von-Karman nonlinear kinematics. The elastic foundation is modeled as shear deformable with cubic nonlinearity. The elastic and hygrothermal properties of the fiber reinforced composite material are considered to be dependent on temperature and moisture concentration and have been evaluated utilizing micromechanics model. The quadratic extrapolation technique is used for linearization and fast converging finite double Chebyshev series is used for spatial discretization of the governing nonlinear equations of equilibrium. The effects of Winkler and Pasternak foundation parameters, temperature and moisture concentration on nonlinear flexural response of the laminated composite rectangular plate with different lamination scheme and boundary conditions are presented.
Ramesh Pandey, K.K. Shukla, and Anuj Jain
Elsevier BV
Abstract The paper presents Chebyshev series based analytical solutions for the postbuckling response of the moderately thick laminated composite rectangular plates with and without elastic foundations. The plate is assumed to be subjected to in-plane mechanical, thermal and thermomechanical loadings. In-plane mechanical loading consists of uniaxial, biaxial, shear loadings and their combinations. The temperature induced loading is due to either uniform temperature or a linearly varying temperature across the thickness. The mathematical formulation is based on higher order shear deformation theory (HSDT) and von-Karman nonlinear kinematics. The elastic foundation is modeled as shear deformable with cubic nonlinearity. The thermal and mechanical properties of the composites are assumed to be temperature dependent. The quadratic extrapolation technique is used for linearization and fast converging finite double Chebyshev series is used for spatial discretization of the governing nonlinear equations of equilibrium. The effects of plate parameters and foundation parameters on buckling and postbuckling response of the plate are presented.
K. K. SHUKLA, K. V. RAVI KUMAR, RAMESH PANDEY, and Y. NATH
World Scientific Pub Co Pte Lt
The present work deals with the stability analysis of shear deformable functionally graded rectangular plates subjected to thermo-mechanical loads. The material properties of the functionally graded plates are assumed to vary continuously through the thickness, according to a simple power law distribution of the volume fraction of the constituents. An analytical approach based on fast converging Chebyshev polynomials is presented. The formulation is based on first-order shear deformation plate theory and von-Karman nonlinearity. The temperature-dependent thermal and mechanical properties of FGM plate are considered. The variations in the buckling load/temperature due to various parameters are studied. The postbuckling response of the clamped FGM plate, subjected to in-plane edge compressive mechanical loading (uniaxial, biaxial, shear), thermal (uniform in-plane temperature, transverse temperature gradient) and thermo-mechanical loading are presented. It is observed that volume fraction index greatly affects the buckling load/temperature of the plate.