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Kumar V.,Sathyabama Institute of Science and Technology | Ghosh A.,Sathyabama Institute of Science and Technology
Theoretical and Applied Fracture Mechanics | Year: 2015

The dynamic fragmentation of brittle materials using the cracking particles method (CPM) with obscuration zone is studied. The CPM is an effective meshfree method for arbitrary evolving cracks. The crack is modeled by piecewise straight crack segments and does not require any topological representation of the crack surface. To avoid artificial cracks observed in discrete continuum approaches, obscuration zones are used as suggested by Mott. The influence of the variation in material properties with different stochastic input parameters on the results is studied as well. © 2014 Elsevier Ltd. Source


Ghosh A.,Sathyabama Institute of Science and Technology | Kumar V.,Sathyabama Institute of Science and Technology
Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science | Year: 2013

We study dynamic fragmentation of metallic structures using the cracking particles method with obscuration zone. The cracking particles method is an efficient meshfree method for modeling dynamic fracture. Fracture is modeled by a set of crack segments. The cracking particles method does not require the representation of the crack topology. To avoid numerical fracture observed in discrete approaches, we employ obscuration zones proposed by Mott in his analytical work of fragmentation theory. We also study the influence of initial imperfections with different stochastic input parameters on the results. © 2012 IMechE. Source


Kumar V.,Sathyabama Institute of Science and Technology | Ghosh A.,Sathyabama Institute of Science and Technology
Computational Materials Science | Year: 2015

We study the dynamic fracture of thin metal rings with the Cracking Particles Method (CPM). The CPM models the crack as set of straight crack segments and does not require track cracking algorithms. No empirical criteria for branching and joining cracks as in method with continuous crack surface are required. The constitutive behavior is considered non-linear in this contribution. Our methodology is used for several experimental set-ups in order to study the influence of different parameters such as the loading rate, the strain-to-fracture, the fracture energy, among others. The results are compared to results based on linear elasticity. © 2014 Elsevier B.V. Source

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