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Citations since 2016
6 Research Items
My expertise is in development of various novel stochastic multiscale algorithms for composite materials with complex microstructure including adaptive mesh algorithms, XFEM based numerical techniques (MsXFEM, multi-split XFEM, multi-split MsXFEM), and coupled XFEM-Gradient Enhanced Damage model. Currently, my research focus is to develop and optimize both numerical and experimentation methods for understanding the role of collagen fiber architecture on the biomechanics of soft tissues.
November 2014 - September 2019
- MHRD has provided the financial support for the PhD thesis entitled as "Computationally efficient multi-split XFEM for the analysis of heterogeneous materials"
August 2013 - October 2014
Lovely Professional University
- Professor (Assistant)
A coupling of extended finite element method (XFEM) and strain gradient enhanced damage method is proposed to model damage initiation and growth in the materials with reinforcement particles. The proposed model inherits the advantages of both methods i.e., simple definition of reinforcement particles from XFEM and numerical stability during damage...
In this article, a computationally efficient multi-split MsXFEM is proposed to evaluate the elastic properties of heterogeneous materials. The multi-split MsXFEM is the combination of multi-split XFEM with multiscale finite element methods (MsFEM). The multi-split XFEM is capable to model multiple discontinuities in a single element which leads to...
We propose a parallel and computationally efficient multi-split XFEM approach for 3-D analysis of heterogeneous materials. In this approach, multiple discontinuities (pores and reinforcement particles) may intersect any given element (we call those elements multi-split elements). These discontinuities are modeled by imposing additional degrees of f...
In the present study, a two-scale stochastic framework has been proposed for predicting the failure strength probability of heterogeneous materials. The analysis at both scales (meso and macro) is performed under plane stress condition. The meso-scale analysis is performed by XFEM whereas the macro-scale analysis is performed by FEM. The heterogene...
In this work, a strength pair model has been proposed for the numerical prediction of flexural strength probability of NBG-18 nuclear grade graphite. The input to the proposed model is a random strength pair of tensile and compressive strengths whose value is based on its probability of occurrence in the experimental data. A finite element–based de...
A stochastic XFEM model based on microstructural observations has been developed to evaluate the tensile strength of NBG-18 nuclear graphite. The nuclear graphite consists of pitch matrix, filler particles, pores and micro-cracks. The numerical simulations are performed at two length scales due to large difference in average size of filler particle...
Although stress intensity parameter is independent of plane stress and plane strain conditions, the energy release rate of the crack varies in these conditions. The energy release rate is higher in plane stress condition than in plane strain condition. The paper attempts to capture the magnitude of the effect of plane stress and plane strain condit...
In the present investigation safe internal pressure is determined in delaminated composite cylindrical shells with the consideration of absence of delamination growth. Critical strain energy release rate (CSERR) criterion is used to evaluate the allowable intensity of stresses in the structure near the delamination front. Virtual crack closer techn...
Although stress intensity parameter is independent of plane stress and plane strain conditions, the energy release rate varies in these condition. It is higher in plane stress than plane strain condition. The paper attempts to capture the magnitude of the effect of these conditions over energy release rate of the crack in SSY (LEFM) and EPFM regime...
The "*STATIC, Stabilize, Factor=2e-4" is commonly used in Abaqus to initiate adaptive automatic damping algorithm. I am looking to implement the same using Calculix but "Stabilize" is not recogonized by "Calculix". Kindly share your expertise to resolve the issue.
It has been documented (Grigoriev et al. 2010) that bending strength of ZrB2–SiC ceramics increases with increase in volume fraction (0-30%) of Sic particulates. Although both matrix and filler behave as brittle. Considering brittle behaviour, the composite strength should not exceed the matrix strength as matrix will fail first even if strength of particulates are more than matrix specially in tensile loading. Please correct me and comment
Thanks in advance
Most of the pressure dependent plasticity model like Drucker-Prager experiences volumetric plastic deformation. It is really doubtful to understand whether plastic incompressibility condition is valid or not ?? During there plane stress implementation of these pressure dependent plasticity models. In case, condition is not valid !! Then how to evaluate the plastic component of strain in z-z direction
Thanks in advance
Generally in the literature for the sample preparation of graphite it is mentioned to use 0.5 micron SiC powder in water based suspension system for polishing. But in case SiC powder is not available can we use Cerium oxide or Alumina powder ? or any other ???
Thanks in advance
In order to evaluate the reduced basis for the initiation of the simulation process we have to pre-compute the displacement vector for all the time steps. If through POD we have to escape the process of evaluating displacement vector for the large DOF system then what is the point of pre-evaluation of the displacement vectors ??? Please correct me if wrong
Thanks in advance
To develop a computationally efficient stochastic multiscale framework for the evaluation of bulk properties of the heterogeneous composite
The main objective of the work is to optimise the ply sequence in the laminated composite shells taking into account the delamination and other failure parameters