Search results for: I.V. Singh

Items from 1 to 20 out of 39 results

article

Experimental and numerical studies to estimate fatigue crack growth behavior of Ni-based super alloy

M. Kumar, S. Ahmad, I.V. Singh, A.V. Rao, more

Theoretical and Applied Fracture Mechanics > 2018 > 96 > C > 604-616

In this work, the fatigue crack growth behavior of the Nickel based super alloy is investigated at room (26 °C) and elevated temperature (650 °C). The fatigue crack growth experiments are performed to understand the effect of temperature and loading rate. The elasto plastic fracture toughness tests are performed to evaluate JIC. Paris law is used in conjunction with extended finite element method...

article

An adaptive multiscale phase field method for brittle fracture

R.U. Patil, B.K. Mishra, I.V. Singh

Computer Methods in Applied Mechanics and Engineering > 2018 > 329 > C > 254-288

In the present work, a multiscale finite element method (MsFEM) is coupled with hybrid phase field method to simulate brittle fracture problems. This approach along with adaptive meshing, known as adaptive multiscale phase field method (AMPFM), is quite useful for local mesh refinement. During mesh refinement, the degrees of freedom of coarse-mesh and fine-mesh are linked together using multiscale...

article

A two-scale stochastic framework for predicting failure strength probability of heterogeneous materials

Manik Bansal, I.V. Singh, B.K. Mishra, Kamal Sharma, more

Composite Structures > 2017 > 179 > C > 294-325

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 heterogeneities (pores and reinforced particles) are considered...

article

A stochastic XFEM model for the tensile strength prediction of heterogeneous graphite based on microstructural observations

Manik Bansal, I.V. Singh, B.K. Mishra, Kamal Sharma, more

Journal of Nuclear Materials > 2017 > 487 > C > 143-157

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 particles and pores. Both deterministic and stochastic approaches...

article

A simple, efficient and accurate Bézier extraction based T-spline XIGA for crack simulations

S.K. Singh, I.V. Singh, B.K. Mishra, G. Bhardwaj, more

Theoretical and Applied Fracture Mechanics > 2017 > 88 > C > 74-96

In the present work, a simple, efficient and accurate Bézier extraction based T-spline XIGA (BEBT-XIGA) has been proposed for the crack simulations. Bézier extraction maps T-spline basis functions over the element in the forms of Bernstein polynomial basis defined over the Bézier element. T-spline basis functions over the element can be written as linear combination of Bernstein polynomials basis...

article

A new multiscale XFEM for the elastic properties evaluation of heterogeneous materials

R.U. Patil, B.K. Mishra, I.V. Singh

International Journal of Mechanical Sciences > 2017 > 122 > C > 277-287

In the present work, extended finite element method (XFEM) in conjunction with multiscale finite element method (MsFEM) is employed to model heterogeneous materials i.e. matrix having particles and/or voids. This approach, named as multiscale extended finite element method (MsXFEM), is used to determine the effective elastic properties of heterogeneous materials. The elastic properties are calculated...

article

Simulation of 3-D Cracks under Thermo-Mechanical Environment

Himanshu Pathak, Ranjan Kumar Mishra, Akhilendra Singh, I.V. Singh

Materials Today: Proceedings > 2017 > 4 > 9 > 10259- 10263

This paper presents a simple and efficient extended finite element method (XFEM) approach to simulate three-dimensional crack geometry under thermo-mechanical loading conditions. In this proposed approach, thermo-mechanical problem decoupled and get solved for thermal and mechanical loading conditions separately. In-post processing phase, domain based interaction integral has been employed to get...

article

Nonlinear Fatigue Crack Growth Simulations using J-integral Decomposition and XFEM

Manish Kumar, A.S. Bhuwal, I.V. Singh, B.K. Mishra, more

Procedia Engineering > 2017 > 173 > C > 1209-1214

In the present work, nonlinear fatigue crack growth analysis of an inclined edge crack is performed by extended finite element method (XFEM) [1]. The material behavior is assumed to be nonlinear, which is modelled by Ramberg-Osgood model and von-Mises yield criterion. Due to inherent material nonlinearity, the interaction integral approach cannot be used for evaluating the individual stress intensity...

article

Numerical Prediction of Indentation Behavior of Metal Matrix Composites Using XFEM

A.S. Shedbale, I.V. Singh, B.K. Mishra, S.K. Singh

Procedia Engineering > 2017 > 173 > C > 1071-1078

In this study, the effects of particle volume fraction, particle size and particle distribution is investigated on the indentation behavior of metal matrix composites (MMCs) using extended finite element approach. The particles are assumed to be circular in shape. The matrix (Zr2.5Nb) is assumed to have an elasto-plastic behaviour whereas the particles (SiC) are assumed to have linear elastic behavior...

article

Fatigue crack growth analysis of an interfacial crack in heterogeneous materials using homogenized XIGA

G. Bhardwaj, S.K. Singh, I.V. Singh, B.K. Mishra, more

Theoretical and Applied Fracture Mechanics > 2016 > 85 > PB > 294-319

In this work, the fatigue life of an interfacial cracked plate is evaluated in the presence of flaws by homogenized extended isogeometric analysis (XIGA). In XIGA, the crack faces are modeled by discontinuous Heaviside jump functions, whereas the singularity in the stress field at the crack tip is modeled by crack tip enrichment functions. Holes and inclusions are modeled by Heaviside function and...

article

New enrichments in XFEM to model dynamic crack response of 2-D elastic solids

Sachin Kumar, I.V. Singh, B.K. Mishra, Akhilendra Singh

International Journal of Impact Engineering > 2016 > 87 > C > 198-211

In the present work, three different enrichment schemes are proposed in conjunction with XFEM to investigate the dynamic response of cracked structures. In the proposed enrichment schemes, only two additional degrees of freedom are added at each node of the crack tip element to reduce the matrix size. In the first enrichment scheme, only Heaviside function is used to model the crack tip. In the second...

article

Fatigue crack growth in functionally graded material using homogenized XIGA

G. Bhardwaj, I.V. Singh, B.K. Mishra

Composite Structures > 2015 > 134 > C > 269-284

In this work, the effect of defects/flaws (holes, inclusions, cracks) on the fatigue life of functionally graded material (FGM) is analyzed by homogenized extended isogeometric analysis (XIGA). In FGM, the gradation in the material properties is taken along the length of the plate. In XIGA, the crack faces are modeled by discontinuous Heaviside jump function, whereas the singularity in stress field...

article

Numerical simulation of functionally graded cracked plates using NURBS based XIGA under different loads and boundary conditions

Gagandeep Bhardwaj, I.V. Singh, B.K. Mishra, T.Q. Bui

Composite Structures > 2015 > 126 > Complete > 347-359

In this paper, extended isogeometric analysis (XIGA) is performed to simulate the cracked functionally graded material (FGM) plates using first order shear deformation theory (FSDT) under different types of loading and boundary conditions. The gradation in material properties of the plate vary exponentially along thickness direction. The top and bottom surfaces of the plate are composed of ceramic...

article

A homogenized XFEM approach to simulate fatigue crack growth problems

Sachin Kumar, I.V. Singh, B.K. Mishra

Computers and Structures > 2015 > 150 > Complete > 1-22

In this work, a homogenized XFEM approach has been proposed to evaluate the fatigue life of an edge crack plate in the presence of discontinuities (holes, inclusions and minor cracks). In this approach, the central 20% region of the plate is discretized by fine-mesh whereas remaining 80% region is discretized by coarse mesh. In case of holes and inclusion, the 80% continuum region of the plate has...

article

Stochastic fatigue crack growth simulation of interfacial crack in bi-layered FGMs using XIGA

G. Bhardwaj, I.V. Singh, B.K. Mishra

Computer Methods in Applied Mechanics and Engineering > 2015 > 284 > Complete > 186-229

In this work, extended isogeometric analysis (XIGA) is employed to compute the fatigue life of interfacial edge cracked functionally graded materials (FGMs). The effect of multiple defects (holes, inclusions and minor cracks) on the fatigue life of the interfacial cracked FGM plate is evaluated by XIGA. The bottom layer of the bi-layered plate is made of aluminum alloy while the upper one is made...

article

Elasto-Plastic Finite Deformation Simulations using 3-D Parallel XFEM

A.K. Sharma, A.S. Shedbale, I.V. Singh, B.K. Mishra

Materials Today: Proceedings > 2015 > 2 > 4-5 > 2030-2036

In this work, a parallel XFEM is presented to solvenonlinear solid mechanics problems. The material behavior is modeled using isotropic hardening based on J₂ theory of plasticity. The geometrical nonlinearity is modeled through updated Lagrangian formulation. Penalty approach is employed to impose the contact constraint at the material interfaces. A node-to-node technique is used to model the contact...

article

Modeling and simulation of kinked cracks by virtual node XFEM

Sachin Kumar, I.V. Singh, B.K. Mishra, Timon Rabczuk

Computer Methods in Applied Mechanics and Engineering > 2015 > 283 > C > 1425-1466

In the present work, virtual node extended finite element method (VNXFEM) is proposed for modeling and simulation of kinked cracks in a single element. The kinked crack growth in an element is performed using the concept of virtual nodes to model and improve the accuracy of the solution. The virtual nodes are enriched with additional degrees of freedom. In the proposed approach, an actual tip element...

article

A multigrid coupled (FE-EFG) approach to simulate fatigue crack growth in heterogeneous materials

Sachin Kumar, I.V. Singh, B.K. Mishra

Theoretical and Applied Fracture Mechanics > 2014 > 72 > Complete > 121-135

In the present work, a multigrid coupled finite element (FE) and element free Galerkin (EFG) approach has been proposed to evaluate the fatigue life of cracked heterogeneous plate under plane stress condition. The discontinuities located away from the major crack have negligible effect on the fatigue life. Therefore, discontinuities are modeled only in a small region near the major crack. This small...

article

Mechanical behaviour and microstructural characterizations of ultrafine grained Zircaloy-2 processed by cryorolling

Sunkulp Goel, Nachiket Keskar, R. Jayaganthan, I.V. Singh, more

Materials Science & Engineering A > 2014 > 603 > Complete > 23-29

The mechanical properties and microstructural characteristics of ultrafine grained Zircaloy-2 processed by cryorolling (CR) were investigated in the present work. The solutionised Zircaloy-2 was rolled at liquid nitrogen temperature (77K) with different thickness reductions (25–85%). The dislocation density 〈ρ〉 in the cryorolled Zircaloy-2 increases with increasing true strain due to the suppression...

article

Fatigue life simulation of functionally graded materials under cyclic thermal load using XFEM

S. Bhattacharya, I.V. Singh, B.K. Mishra

International Journal of Mechanical Sciences > 2014 > 82 > Complete > 41-59

In this work, the fatigue life of a functionally graded material (FGM) plate made of aluminum alloy and alumina (ceramic) is simulated under cyclic thermal load. The various discontinuities such as minor cracks, holes and inclusions of arbitrary size are randomly distributed in the plate. The fatigue lives of aluminum alloy, FGM and an equivalent composite (having the same composition as of FGM) plates...

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Keywords

XFEM (10)
FATIGUE LIFE (7)
EFGM (4)
INTRINSIC ENRICHMENT (4)
CRYOROLLING (3)
DISCONTINUITIES (3)
HOLES (3)
INCLUSIONS (3)
LARGE DEFORMATION (3)
STRESS INTENSITY FACTORS (3)
VON-MISES YIELD CRITERION (3)
XIGA (3)
BI-MATERIAL (2)
EXTENDED FINITE ELEMENT METHOD (2)
FATIGUE CRACK GROWTH (2)
FGM (2)
HEAT TRANSFER (2)
HOMOGENIZATION (2)
INTERFACIAL CRACKS (2)
MESHLESS METHOD (2)
PARALLEL COMPUTING (2)
RAMP FUNCTION (2)
SIF (2)
SIFS (2)
STOCHASTIC ANALYSIS (2)
TENSILE STRENGTH (2)
UPDATED LAGRANGIAN APPROACH (2)
ZIRCALOY-2 (2)
3-D CRACKS (1)
6082 AL-ALLLOY (1)
A. NON-FERROUS METALS AD ALLOYS (1)
ADAPTIVE HANGING NODE (1)
ADAPTIVE MESH REFINEMENT (1)
AMPFM (1)
ARBITRARY SHAPE HETEROGENEITIES (1)
B. INTERFACE (1)
B. STRENGTH (1)
BEND (1)
BI-LAYERED FGM (1)
BI-METALLIC (1)
BRITTLE FRACTURE (1)
BÉZIER ELEMENT (1)
BÉZIER EXTRACTION (1)
C. COMPUTATIONAL MODELLING (1)
C. HEAT TREATMENT (1)
CHARACTERIZATIONS (1)
COMPRESSIVE STRENGTH (1)
CONTACT (1)
CONTACT MODELING (1)
COUPLED FE–EFG APPROACH (1)
CPU TIME (1)
CRACK (1)
CRACK GROWTH (1)
CRACKS (1)
DARCY–FORCHHIMER POROUS MEDIUM (1)
DEFECTS (1)
DYNAMIC FRACTURE MECHANICS (1)
DYNAMIC STRESS INTENSITY FACTOR (1)
E. MECHANICAL (1)
EDGE CRACK (1)
EDGE CRACK PLATE (1)
EFG METHOD (1)
ELASTIC MODULUS (1)
ELASTIC PROPERTIES (1)
ELASTIC-PREDICTOR AND PLASTIC-CORRECTOR ALGORITHM (1)
ELEMENT FREE GALERKIN METHOD (1)
ENRICHMENT FUNCTIONS (1)
EQUIVALENT COMPOSITE PLATE (1)
EXTENDED ISOGEOMETRIC ANALYSIS (1)
EXTENDED ISOGEOMETRIC ANALYSIS (XIGA) (1)
FATIGUE CRACK PROPAGATION (1)
FGM PLATE (1)
FINITE ELEMENTS METHOD (1)
FIRST ORDER SHEAR DEFORMATION THEORY (1)
FLAWS (1)
FRACTURE TOUGHNESS (1)
FREE CONVECTION (1)
GALERKIN ELEMENT FREE METHOD (1)
HEAVISIDE FUNCTION (1)
HETEROGENEOUS MATERIAL (1)
HETEROGENEOUS MATERIAL (1)
HOMOGENIZED XFEM (1)
HOMOGENIZED XIGA (1)
INDENTATION (1)
INTERFACE CRACK (1)
INTERFACE CRACKS (1)
ISOTROPIC STRAIN HARDENING (1)
J-DECOMPOSITION (1)
J-INTEGRAL (1)
JUMP FUNCTION (1)
KINKED CRACK (1)
LAGRANGE MULTIPLIER TECHNIQUE (1)
LAGRANGIAN FORMULATION (1)
LOCAL MESH REFINEMENT (1)
M-INTEGRAL (1)
MACRO-ELEMENT (1)
MECHANICAL CHARACTERIZATION (1)
MHD (1)
MICRO-ELEMENT (1)
MICRO-MACRO MODEL (1)
more

Journal

Procedia Engineering (6)
Theoretical and Applied Fracture Mechanics (5)
International Journal of Mechanical Sciences (4)
Composite Structures (3)
Computer Methods in Applied Mechanics and Engineering (3)
Materials and Design (3)
Materials Science & Engineering A (2)
Materials Today: Proceedings (2)
Procedia Materials Science (2)
Advances in Engineering Software (1)
Applied Mathematical Modelling (1)
Applied Mathematics and Computation (1)
Composites Part B (1)
Computers and Structures (1)
International Journal of Fatigue (1)
International Journal of Heat and Mass Transfer (1)
International Journal of Impact Engineering (1)
Journal of Nuclear Materials (1)
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INFONA - science communication portal

Search results for: I.V. Singh

Experimental and numerical studies to estimate fatigue crack growth behavior of Ni-based super alloy

An adaptive multiscale phase field method for brittle fracture

A two-scale stochastic framework for predicting failure strength probability of heterogeneous materials

A stochastic XFEM model for the tensile strength prediction of heterogeneous graphite based on microstructural observations

A simple, efficient and accurate Bézier extraction based T-spline XIGA for crack simulations

A new multiscale XFEM for the elastic properties evaluation of heterogeneous materials

Simulation of 3-D Cracks under Thermo-Mechanical Environment

Nonlinear Fatigue Crack Growth Simulations using J-integral Decomposition and XFEM

Numerical Prediction of Indentation Behavior of Metal Matrix Composites Using XFEM

Fatigue crack growth analysis of an interfacial crack in heterogeneous materials using homogenized XIGA

New enrichments in XFEM to model dynamic crack response of 2-D elastic solids

Fatigue crack growth in functionally graded material using homogenized XIGA

Numerical simulation of functionally graded cracked plates using NURBS based XIGA under different loads and boundary conditions

A homogenized XFEM approach to simulate fatigue crack growth problems

Stochastic fatigue crack growth simulation of interfacial crack in bi-layered FGMs using XIGA

Elasto-Plastic Finite Deformation Simulations using 3-D Parallel XFEM

Modeling and simulation of kinked cracks by virtual node XFEM

A multigrid coupled (FE-EFG) approach to simulate fatigue crack growth in heterogeneous materials

Mechanical behaviour and microstructural characterizations of ultrafine grained Zircaloy-2 processed by cryorolling

Fatigue life simulation of functionally graded materials under cyclic thermal load using XFEM

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