Vaishali Vaishali

• Ph.D
• Assistant professor at Government engineering college, Samastipur

This study investigates the mechanical properties and microstructural characteristics of aluminum/silicon nitride (Al/SiN) composites fabricated via the powder metallurgy process. Optimal processing conditions, including 7% silicon nitride content and sintering at 550 °C for 120 min, were identified, leading to significant improvements in both comp...

Sandwich structures are highly advanced engineering constructs widely used in fields such as marine science, automotive engineering, aerospace, etc. Recent research has shifted towards exploiting the unique benefits of laminated composites, sandwich structures, and functionally graded (FG) materials, each offering advantages over traditional solid...

The computational study for strut and parallel cavities Supersonic Combustor Ramjet (SCRAMJET) combustor is executed by adopting Reynolds Averaged Navier Stokes (RANS) equations for compressible and steady flow. The combustion phenomenon in SCRAMJET occurs at supersonic velocities, due to which severe instabilities in the flow is observed. The turb...

This paper portrays the natural frequencies and mode shapes of composite circular plate being inspired from the construction of annual rings at stem of the tree. This bio-inspired concentric circular orientation of fibers unlike annual ring model can be utilized as structural components of engineering systems. Each layer of concentric circular fibe...

This paper presents the surrogate-based predictive dynamic behavior of hybrid functionally graded sandwich cylindrical shells. The material properties are graded based on the power law for functionally graded structures to comply with high strength and stiffness at an elevated temperature. At the same time, the sandwich composite is employed to ens...

This chapter presents the stochastic low-velocity impact responses of a cantilever plate composed of functionally graded materials (FGM) by employing the radial basis function (RBF) model. A novel algorithm is developed to ascertain the stochastic transient impact responses experienced by the FGM plates due to the central impact of a spherical stee...

First-order shear deformation theory (FSDT) is less accurate compared to higher-order theories like higher-order zigzag theory (HOZT).In case of large-scale simulation-based analyses like uncertainty quantification and optimization using FSDT, such errors propagate and accumulate over multiple realizations, leading to significantly erroneous result...

PurposeThe aim of this paper is to quantify the stochastic effect for functionally graded (FG) plate in conjunction to free vibration and impact loading.Method The variabilities in geometric and materials properties are considered. A support vector machine (SVM) is employed to construct the surrogate model. The constructed model portrays significan...

This article reflects the effect of relative thickness of various components of hybrid structures on random natural frequencies of hyperbolic paraboloid shells. The total thickness, other geometrical parameters and the material properties are kept constant. Here, the hybrid shell structure is composed of three different components: laminated compos...

Purpose: This paper presents the sensitivity analysis (SA) of the random natural frequency responses of hybrid multi-functionally graded sandwich (HMGS) shells for establishing a unified measure in the case of multi-objective performances. The functionally graded materials, laminated composites, and sandwich cores are employed to develop such novel...

In structural applications, laminated composites are typically the best choice for providing a high strength-to-weight ratio. The composite laminates, on the other hand, are susceptible to the first ply failure (FPF), which can result in delamination, matrix cracking, and fibre breaking. As a result, it's critical to map the FPF of laminated compos...

This paper showcases the outcome of thickness on probabilistic natural frequencies of hybrid functionally graded (FG)-sandwich materials with cylindrical shell geometry. The top facesheet of the sandwich structure is replaced by functionally graded material, while the bottom facesheet is that of laminated composites. An eight noded isoperimetric qu...

Purpose: To investigate the probabilistic low-velocity impact of functionally graded (FG) plate using the MARS model, considering uncertain system parameters. Design/methodology/application: The distribution of various material properties throughout FG plate thickness is calculated using power law. For finite element (FE) formulation, isoparametric...

The present chapter investigates the moment-independent sensitivity analysis for hybrid sandwich structures (having cylindrical shell geometry) subjected to low-velocity impact. These hybrid structures are extensively used in lightweight applications where thermal exposure/resistance is of prime importance. Here, the FG facesheet is placed at the u...

This paper presents the effect of temperature on random natural frequencies of spherical shells, composed of functionally graded materials (FGM) with zirconia (ceramic rich) and aluminium (metal rich). An eight noded isoperimetric quadratic element is considered for the finite element formulation. The power law is employed to construct the material...

This paper presents the effect of temperature on stochastic natural frequencies of cylindrical shells, composed of functionally graded materials (FGM) by using machine learning quadratic Support Vector Machine (SVM). An eight noded isoperimetric quadratic element is considered for the finite element formulation. The power law is employed to constru...

Functionally graded materials, sandwich structures and composite laminates have been widely investigated individually in last few decades for their respective set of advantages over conventional monolithic structures. However, the tremendous recent advances in manufacturing processes have opened up new frontiers of research specifically to form hyb...

This paper presents stochastic dynamic characterization of functionally graded shells based on an efficient Support Vector Machine assisted finite element (FE) approach. Different shell geometries such as cylindrical, spherical, elliptical paraboloid and hyperbolic paraboloid are investigated for the stochastic dynamic analysis. Monte Carlo Simulat...

This study presents the effect of skewness in natural frequency responses of sandwich plates. The free vibration analysis is carried out by using higher order zigzag theory (HOZT) considering random input parameters. It satisfies the transverse shear stress continuity condition and the transverse flexibility effect. The in-plane displacement throug...

Purpose – The purpose of this paper is to investigate the first three stochastic natural frequencies of skewed sandwich plates, considering uncertain system parameters. To conduct the sensitivity analysis for checking the criticality of input parameters. Design/methodology/approach – The theoretical formulation is developed based on higher-order zi...