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Raju Sethuraman

Bio: Raju Sethuraman is an academic researcher from Indian Institute of Technology Madras. The author has contributed to research in topics: Finite element method & Vibration. The author has an hindex of 15, co-authored 40 publications receiving 699 citations. Previous affiliations of Raju Sethuraman include Indian Institutes of Technology & Indian Institute of Technology Kanpur.

Papers
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Journal ArticleDOI
TL;DR: In this paper, a local crack growth initiation criterion is proposed, which makes use of the critical damage as the continuum parameter and the average austenite grain size as the characteristic length.

120 citations

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TL;DR: In this paper, a modified crack closure integral method with square root stress singularity elements is given for calculation of strain energy release rate for an in-plane extension of a crack.

69 citations

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TL;DR: In this article, the linear elastic solution of a boundary value problem is used as a basis to generate its inelastic solution, which is obtained in an iterative manner using the projection method, the arc length method, and Nueber's rule.

59 citations

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TL;DR: In this article, a J2 incremental flow theory along with a damage variable is used to model the material behavior in elasto-plastic regime. And the critical value of the damage variable can be taken as a crack initiation parameter.

54 citations

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TL;DR: In this paper, the authors investigated the linear buckling and free vibration behavior of layered and multiphase magneto-electro-elastic (MEE) beam under thermal environment and derived finite element equations involving the coupling between mechanical, electrical and magnetic fields.
Abstract: The paper deals with the investigation of linear buckling and free vibration behavior of layered and multiphase magneto‐electro‐elastic (MEE) beam under thermal environment. The constitutive equations of magneto‐electro‐elastic materials are used to derive finite element equations involving the coupling between mechanical, electrical and magnetic fields. The finite element model has been verified with the commercial finite element package ANSYS. The influence of magneto electric coupling on critical buckling temperature is investigated between layered and multiphase magneto‐electro‐elastic beam. Furthermore, the influence of temperature rise on natural frequencies of magneto‐electro‐elastic beam with layered and different volume fraction is presented.

46 citations


Cited by
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TL;DR: An overview of the virtual crack closure technique is presented, the approach used is discussed, the history summarized, and insight into its applications provided.
Abstract: : An overview of the virtual crack closure technique is presented. The approach used is discussed, the history summarized, and insight into its applications provided. Equations for two-dimensional quadrilateral elements with linear and quadratic shape functions are given. Formula for applying the technique in conjuction with three-dimensional solid elements as well as plate/shell elements are also provided. Necessary modifications for the use of the method with geometrically nonlinear finite element analysis and corrections required for elements at the crack tip with different lengths and widths are discussed. The problems associated with cracks or delaminations propagating between different materials are mentioned briefly, as well as a strategy to minimize these problems. Due to an increased interest in using a fracture mechanics based approach to assess the damage tolerance of composite structures in the design phase and during certification, the engineering problems selected as examples and given as references focus on the application of the technique to components made of composite materials.

1,354 citations

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TL;DR: In this article, a new plastic-damage constitutive model for concrete is proposed, where a tensile and a shear damage variable are adopted to describe the degradation of the macromechanical properties of concrete.

459 citations

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TL;DR: In this article, a series of tests on 2024-T351 aluminum alloy, including upsetting tests and tensile tests is carried out, and it is shown that different functions are necessary to predict crack formation for different ranges of stress triaxiality.
Abstract: Various fracture criteria, based on different assumptions and different mechanical models, have been proposed in the past to predict ductile fracture. The objective of this study is to assess their effectiveness and accuracy in a wide range of process parameters. A series of tests on 2024-T351 aluminum alloy, including upsetting tests and tensile tests is carried out. It is found that none of the existing fracture criteria give consistent results. Two totally different fracture mechanisms are clearly observed from microfractographs of upsetting and tensile specimens. This observation confirms that it is impossible to capture all features of ductile crack formation in different stress states with a single criterion. It is shown that different functions are necessary to predict crack formation for different ranges of stress triaxiality. Weighting functions in a wide range of stress states can be obtained by determining the fracture locus in the space of equivalent strain to fracture and stress triaxiality.

394 citations

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TL;DR: In this paper, a phenomenological fracture initiation model for metals is developed for predicting ductile fracture in industrial practice based on the assumption that the onset of fracture is imminent with the formation of a primary or secondary band of localization.

369 citations

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TL;DR: In this article, an elastoplastic constitutive model based on the disturbed state concept is adopted to characterize the behavior of the modeled rockfill materials, consisting of rounded and angular particles obtained from two dam sites are subjected to triaxial tests using large size specimens.
Abstract: Modeled rockfill materials consisting of rounded and angular particles obtained from two dam sites are subjected to drained triaxial tests using large size specimens. An elastoplastic constitutive model based on the disturbed state concept is adopted to characterize the behavior of the modeled rockfill materials. The material parameters for the two rockfill materials are determined from the experimental results. The variation of the material parameters with respect to the size of the particles for the rockfill material with the rounded particle is, in general, opposite to that for the rockfill material with the angular particles. The model is shown to provide satisfactory prediction of the behavior of the rockfill materials tested. Material parameters are predicted for prototype size of rockfill materials.

265 citations