Experimental and numerical bending deflection of cenosphere filled hybrid (Glass/Cenosphere/Epoxy) composite

Harsh Kumar Pandey,Himanshu Agrawal,Subrata Kumar Panda,Chetan Kumar Hirwani,Pankaj V Katariya,Hukum Chand Dewangan 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.73 No.6

The influence on flexural strength of Glass/Epoxy laminated composite curved panels of different geometries (cylindrical, spherical, elliptical, hyperboloid and flat) due to inclusion of nano cenosphere filler examined in this research article. The deflection responses of the hybrid structure are evaluated numerically using the isoparametric finite element technique and modelled mathematically via higher-order displacement structural kinematics. To predict the deflection values, a customised in-house computer code in MATLAB environment is prepared using the higher-order isoparametric formulation. Subsequently, the numerical model validity has been established by comparing with those of available benchmark solution including the convergence characteristics of the finite element solution. Further, a few cenosphere filled hybrid composite are prepared for different volume fractions for the experimental purpose, to review the propose model accuracy. The experimental deflection values are compared with the finite element solutions, where the experimental elastic properties are adopted for the computation. Finally, the effect of different variable design dependent parameter and the percentages of nano cenosphere including the geometrical shapes obtained via a set of numerical experimentation.

Effect of nano glass cenosphere filler on hybrid composite eigenfrequency responses - An FEM approach and experimental verification

Pandey, Harsh Kumar,Hirwani, Chetan Kumar,Sharma, Nitin,Katariya, Pankaj V.,Dewangan, Hukum Chand,Panda, Subrata Kumar Techno-Press 2019 Advances in nano research Vol.7 No.6

The effect of an increasing percentage of nanofiller (glass cenosphere) with Glass/Epoxy hybrid composite curved panels modeled mathematically using the multiscale concept and subsequent numerical eigenvalues of different geometrical configurations (cylindrical, spherical, elliptical, hyperboloid and flat) predicted in this research article. The numerical model of Glass/Epoxy/Cenosphere is derived using the higher-order polynomial type of kinematic theory in association with isoparametric finite element technique. The multiscale mathematical model utilized for the customized computer code for the evaluation of the frequency data. The numerical model validation and consistency verified with experimental frequency data and convergence test including the experimental elastic properties. The experimental frequencies of the multiscale nano filler-reinforced composite are recorded through the impact hammer frequency test rig including CDAQ-9178 (National Instruments) and LABVIEW virtual programming. Finally, the nano cenosphere filler percentage and different design associated geometrical parameters on the natural frequency data of hybrid composite structural configurations are illustrated through a series of numerical examples.

Large Amplitude Hygrothermal Dependent Frequency and Post-Buckling Behaviour of Smart Skew Sandwich Shell Panels -A Macromechanical FE Approach

Pankaj V. Katariya,Subrata Kumar Panda,Chetan Kumar Hirwani 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11

The large geometrical distortion effect on the skew sandwich panel and improvement of the eigenvalue responsesdue to the embedded functional material (shape memory alloy, SMA) is investigated for the first time in this research. Thestructural responses are numerically predicted via a macro-mechanical nonlinear finite element model with the alternatingelastic constants due to the change in environmental conditions. The nonlinear formulation is derived mathematically viathird-order deformation kinematics including the through-thickness elongations. Moreover, the large geometrical shapechanges of the skew sandwich shell panels are described by Green-Lagrange strain whereas the material nonlinearity due tothe functional fibre inclusion modelled through the step-wise temperature-dependent properties of the individual panelconstituents (face skins, core and SMA fibre). The proposed macro-mechanical material model is helping to evaluate thecomposite sandwich properties due to the variation of hygrothermal environment. The eigenvalue type of system equation isderived through variation principle with and without excess geometrical alteration and solved via the robust Picard’s iterationtechnique in association with nonlinear finite element steps. The marching technique is adopted to include the materialnonlinearity within the mathematical model to include the variation of SMA elastic properties (volume fraction, pre-strainand blocking stress). The viability of the proposed model to compute the responses are tested by checking a few examplesconsidering the curvature parameter, layer sequence, SMA layer and the environmental changes. Additionally, it is extendedto figure out the influences of individual and combined cases of parameters on the nonlinear frequency and bucklingcharacteristics of SMA bonded sandwich shell panel with and without skew angle.

Numerical analysis of thermal post-buckling strength of laminated skew sandwich composite shell panel structure including stretching effect

Pankaj V. Katariya,Subrata Kumar Panda 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.34 No.2

The computational post-buckling strength of the tilted sandwich composite shell structure is evaluated in this article. The computational responses are obtained using a mathematical model derived using the higher-order type of polynomial kinematic in association with the through-thickness stretching effect. Also, the sandwich deformation behaviour of the flexible soft-core sandwich structural model is expressed mathematically with the help of a generic nonlinear strain theory i.e. Green-Lagrange type strain-displacement relations. Subsequently, the model includes all of the nonlinear strain terms to account the actual deformation and discretized via displacement type of finite element. Further, the computer code is prepared (MATLAB environment) using the derived higher-order formulation in association with the direct iterative technique for the computation of temperature carrying capacity of the soft-core sandwich within the post-buckled regime. Further, the nonlinear finite element model has been tested to show its accuracy by solving a few numerical experimentations as same as the published example including the consistency behaviour. Lastly, the derived model is utilized to find the temperature load-carrying capacity under the influences of variable factors affecting the soft-core type sandwich structural design in the small (finite) strain and large deformation regime including the effect of tilt angle.

Treatment of industrial effluent to reclaim copper using adsorption technique

Bawkar Shilpa Kalamani,Choubey Pankaj Kumar,Parween Rukshana,Panda Rekha,Singh Pramod Kumar,Jha Manis Kumar,Lee Jae-chun 한국자원공학회 2022 Geosystem engineering Vol.25 No.4

Effluent generated during metal finishing in industries contains large amount of heavy metals, which get discharged into water bodies and creates environmental pollution as well as loss of metal values. Present studies report the adsorption of copper (Cu) from the effluent using Tulsion T-42 resin. Experiments were carried out for the adsorption of Cu from the effluent of Chemical and Mechanical Polishing (CMP) industries using cationic resin Tulsion T-42 (adsorbent). To get the optimized adsorption condition for copper the studies were carried out with varying process parameters i.e., contact time, adsorbent dose, pH, etc. Result of the batch experiments shows that 95% copper was adsorbed from the effluent containing 100 ppm copper using 0.1 g Tulsion T-42 in 50 mL feed solution at pH 4.0 in contact time of 30 min. The obtained data from Cu adsorption studies fitted well with Freundlich adsorption isotherm and followed second-order rate reaction. The 99% copper was found to be eluted from loaded adsorbent using 10% sulfuric acid in 60 min contact time. FT-IR result confirmed that complex with active sulphonic group of Tulsion T-42 was formed. The findings of the studies will be useful for the reclamation of copper from the waste water of metal finishing industries.

Potential hydrometallurgical processes to recycle metals from discarded personal computer

Dinkar Om Shankar,Parween Rukshana,Panda Rekha,Choubey Pankaj Kumar,Ambade Balram,Jha Manis Kumar 한국자원공학회 2022 Geosystem engineering Vol.25 No.3

Rapid technological modernization has accelerated the replacement of older electronic goods with newer ones, which has led to the generation of huge quantities of discarded electronic items at its end-of-life, known as electronic wastes (e-wastes). The growing quantity of e-wastes has become a major threat to the society as well as environment. On the other hand, e-wastes contain several valuable metals and materials of high economic value, which compels researchers to work in the area for secondary resources for metal recovery. Metal recovery from such secondary resources will not only preserve the primary resources but also reduce the loss of valuable metals/materials, protect the environment from their hazardous effects as well as reduce the demand-supply gap of metals up to some extent. In view of the above, present study is focused on the possible effort to figure out variety of metals present in the component of waste personal computers (WPCs) as well as different recycling processes implemented for the efficient recovery of metals.

Nonlinear deflection responses of layered composite structure using uncertain fuzzified elastic properties

B.K. Patle,Chetan K. Hirwani,Subrata Kumar Panda,Pankaj V. Katariya,Hukum Chand Dewangan,Nitin Sharma 국제구조공학회 2020 Steel and Composite Structures, An International J Vol.35 No.6

In this article, the influence of fuzzified uncertain composite elastic properties on non-linear deformation behaviour of the composite structure is investigated under external mechanical loadings (uniform and sinusoidal distributed loading) including the different end boundaries. In this regard, the composite model has been derived considering the fuzzified elastic properties (through a triangular fuzzy function, α cut) and the large geometrical distortion (Green-Lagrange strain) in the framework of the higher-order mid-plane kinematics. The results are obtained using the fuzzified nonlinear finite element model via in-house developed computer code (MATLAB). Initially, the model accuracy has been established and explored later to show the dominating elastic parameter affect the deflection due to the inclusion of fuzzified properties by solving a set of new numerical examples.

Total marrow and lymphoid irradiation with helical tomotherapy: a practical implementation report

Srinivas Chilukuri,Sham Sundar,Rajesh Thiyagarajan,Jose Easow,Mayur Sawant,Ganapathy Krishanan,Pankaj Kumar Panda,Dayananda Sharma,Rakesh Jalali 대한방사선종양학회 2020 Radiation Oncology Journal Vol.38 No.3

Purpose: To standardize the technique; evaluate resources requirements and analyze our early experience of total marrow and lymphoid irradiation (TMLI) as part of the conditioning regimen before allogenic bone marrow transplantation using helical tomotherapy. Materials and Methods: Computed tomography (CT) scanning and treatment were performed in head first supine (HFS) and feet first supine (FFS) orientations with an overlap at mid-thigh. Patients along with the immobilization device were manually rotated by 180° to change the orientation after the delivery of HFS plan. The dose at the junction was contributed by a complementary dose gradient from each of the plans. Plan was to deliver 95% of 12 Gy to 98% of clinical target volume with dose heterogeneity <10% and pre-specified organs-at-risk dose constraints. Megavoltage-CT was used for position verification before each fraction. Patient specific quality assurance and in vivo film dosimetry to verify junction dose were performed in all patients. Results: Treatment was delivered in two daily fractions of 2 Gy each for 3 days with at least 8-hour gap between each fraction. The target coverage goals were met in all the patients. The average person- hours per patient were 16.5, 21.5, and 25.75 for radiation oncologist, radiation therapist, and medical physicist, respectively. Average in-room time per patient was 9.25 hours with an average beam-on time of 3.32 hours for all the 6 fractions. Conclusion: This report comprehensively describes technique and resource requirements for TMLI and would serve as a practical guide for departments keen to start this service. Despite being time and labor intensive, it can be implemented safely and robustly.