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.

Nonlinear thermal buckling behaviour of laminated composite panel structure including the stretching effect and higher-order finite element

Katariya, Pankaj V.,Panda, Subrata K.,Mahapatra, Trupti R. Techno-Press 2017 Advances in materials research Vol.6 No.4

The nonlinear thermal buckling load parameter of the laminated composite panel structure is investigated numerically using the higher-order theory including the stretching effect through the thickness and presented in this research article. The large geometrical distortion of the curved panel structure due to the elevated thermal loading is modeled via Green-Lagrange strain field including all of the higher-order terms to achieve the required generality. The desired solutions are obtained numerically using the finite element steps in conjunction with the direct iterative method. The concurrence of the present nonlinear panel model has been established via adequate comparison study with available published data. Finally, the effect of different influential parameters which affect the nonlinear buckling strength of laminated composite structure are examined through numerous numerical examples and discussed in details.

Numerical frequency analysis of skew sandwich layered composite shell structures under thermal environment including shear deformation effects

Pankaj V. Katariya,Subrata K. Panda 국제구조공학회 2019 Structural Engineering and Mechanics, An Int'l Jou Vol.71 No.6

The numerical thermal frequency responses of the skew sandwich shell panels structure are investigated via a higher-order polynomial shear deformation theory including the thickness stretching effect. A customized MATLAB code is developed using the current mathematical model for the computational purpose. The finite element solution accuracy and consistency have been checked via solving different kinds of numerical benchmark examples taken from the literature. After confirming the standardization of the model, it is further extended to show the effect of different important geometrical parameters such as span-to-thickness ratios, aspect ratios, curvature ratios, core-to-face thickness ratios, skew angles, and support conditions on the frequencies of the sandwich composite flat/curved panel structure under elevated temperature environment.

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.

Experimental training of shape memory alloy fibres under combined thermomechanical loading

Digamber Shinde,Pankaj V Katariya,Kulmani Mehar,Md. Rajik Khan,Subrata K. Panda,Harsh K Pandey 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.68 No.5

In this article, experimental training of the commercial available shape memory alloy fibre (SMA) fibre under the combined thermomechanical loading is reported. SMA has the ability to sense a small change in temperature (≥10°C) and activated under the external loading and results in shape change. The thermomechanical characteristics of SMA at different temperature and mechanical loading are obtained through an own lab-scale experimental setup. The analysis is conducted for two types of the medium using the liquid nitrogen (cold cycle) and the hot water (heat cycle). The experimental data indicate that SMA act as a normal wire for Martensite phase and activated behavior i.e., regain the original shape during the Austenite phase only. To improve the confidence of such kind of behavior has been verified by inspecting the composition of the wire. The study reveals interesting conclusion i.e., while SMA deviates from the equiatomic structure or consist of foreign materials (carbon and oxygen) except nickel and titanium may affect the phase transformation temperature which shifted the activation phase temperature. Also, the grain structure distortion of SMA wire has been examined via the scanning electron microscope after the thermomechanical cycle loading and discussed in details.

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.

Theoretical and experimental modal responses of adhesive bonded T-joints

Mani Chandra Kunche,Pradeep K. Mishra,Hari Babu Nallala,Chetan K. Hirwani,Pankaj V. Katariya,Subhransu Panda,Subrata K. Panda 한국풍공학회 2019 Wind and Structures, An International Journal (WAS Vol.29 No.5

The modal frequency responses of adhesive bonded T-joint structure have been analyzed numerically and verified with own experimental data. For this purpose, the damped free frequencies of the bonded joint have been computed using a three-dimensional finite element model via ANSYS parametric design language (APDL) code. The practical relevance of the joint structure analysis has been established by comparing the simulation data with the in-house experimental values. Additionally, the influences of various geometrical and material parameters on the damped free frequency responses of the joint structure have been investigated and final inferences discussed in details. It is observed that the natural frequency values increase for the higher aspect ratios of the joint structure. Also, the joint made up of Glass fiber/epoxy with quasi-isotropic fiber orientation indicates more resistance towards free vibration.

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.

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.