The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Burg Jean-pierre - One of the best experts on this subject based on the ideXlab platform.
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Shale-related minibasins atop a massive olistostrome in an active accretionary wedge setting: Two-dimensional numerical modeling applied to the Iranian Makran
European Geosciences Union, 2020Co-Authors: Ruh, Jonas Bruno, Vergés Jaume, Burg Jean-pierreAbstract:EGU General Assembly in Viena, Austria,7–12 April 2019Minibasins are sagging synformal depocenters surrounded by upsurging Ductile Material. They are traditionallyrelated to salt tectonics. The onshore Iranian Makran accretionary wedge exhibits closed minibasins developedonto a regional-scale olistostrome with a shaly matrix. Two-dimensional numerical experiments were carried out toinvestigate whether the growth of such minibasins above a shale-dominated unit is feasible and how the presence ofa regional, shale-dominated olistostrome may affect the structural evolution of active accretionary wedges. Modelresults indicate that rapid mass-flow emplacement triggers thickening of the rear of the wedge while minibasinsgrow in a more frontal, tectonically quiet region. Further wedge growth leads to a jump forward of frontal accretion.Compared to the case history, this jump would explain the structural characteristics of the Coastal Makran in Iran
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Shale-related minibasins atop a massive olistostrome in an active accretionary wedge setting: Two-dimensional numerical modeling applied to the Iranian Makran
'Geological Society of America', 2018Co-Authors: Ruh, Jonas Bruno, Vergés Jaume, Burg Jean-pierreAbstract:Minibasins are sagging synformal depocenters surrounded by upsurging Ductile Material. They are traditionally related to salt tectonics. The onshore Iranian Makran accretionary wedge exhibits closed minibasins developed onto a regional-scale olistostrome with a shaly matrix. Two-dimensional numerical experiments were carried out to investigate whether the growth of such minibasins above a shale-dominated unit is feasible and how the presence of a regional, shale-dominated olistostrome may affect the structural evolution of active accretionary wedges. Model results indicate that rapid mass-flow emplacement triggers thickening of the rear of the wedge while minibasins grow in a more frontal, tectonically quiet region. Further wedge growth leads to a jump forward of frontal accretion. Compared to the case history, this jump would explain the structural characteristics of the Coastal Makran in Iran.Financial support was provided by the Swiss National Science Foundation (grants 2-77644-09 and 2-77297-15).Peer reviewe
Zhengyi Jiang - One of the best experts on this subject based on the ideXlab platform.
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a comparison of hot deformation behavior of high cr white cast iron and high cr white cast iron low carbon steel laminate
Steel Research International, 2016Co-Authors: Jianzhong Xu, Zhengyi JiangAbstract:In order to study the plastic deformation characteristics of the brittle high-Cr white cast iron in upsetting process, and find out the mechanism for improving the formability of the cast iron within the laminated composite, the hot forging process of monolithic high-Cr white cast iron and high-Cr white cast iron/low carbon steel laminate is simulated by means of hot compression tests using Gleeble 3500 thermo mechanical simulator and professional plastic forming software DEFORM-3D. The results reveal that during hot compression process, the monolithic cast iron suffered severe barreling and cracking, whereas the cast iron layer within the laminate underwent large plastic deformation with barreling-free and crack-free. Such a significant improvement can be attributed to the simultaneous deformation of the cast iron together with the low carbon steel claddings, which is beneficial to relieving the stress in the cast iron and changing its deformation mode. Under the triaxial compressive stress state, the brittle high-Cr white cast iron within the laminate can flow like a Ductile Material at high temperatures and low strain rates.
S R Reid - One of the best experts on this subject based on the ideXlab platform.
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a computational model for failure of Ductile Material under impact
International Journal of Impact Engineering, 2017Co-Authors: Rushdie Ibne Islam, Sukanta Chakraborty, Amit Shaw, S R ReidAbstract:Abstract In addition to an accurate mathematical representation of the Material, a computational modelling method for assessing impact problems involving large plastic deformation, damage localization, fracture etc. requires a suitable discretization scheme which can simulate the relevant physical processes without introducing any numerical artifact or being unstable. In this paper, a computational framework based on Smoothed Particle Hydrodynamics (SPH) is presented for studying the deformation and failure of Ductile Material, steel plate, under impact loading. This provides a useful design tool to simulate penetration of the plate. Crack propagation is modelled through a pseudo spring analogy wherein the interacting particles are assumed to be connected through pseudo-springs and the interaction is continuously modified through an order-parameter based on the accumulated damage in the spring. At the onset of crack formation i.e., when the accumulated damage reaches the critical value, the spring breaks which results in termination of interaction between particles on either sides of the spring. A key feature of the computational model is that it can capture arbitrary propagating cracks without introducing any special treatment such as discontinuous enrichment, particle-splitting etc. This computational framework is used herein to study adiabatic shear plugging in metal plates when modelling penetration under impact loading by a flat-ended, cylindrical projectile. The effects of different damage criteria are discussed. Computed results are compared with the experimental observation given in the literature and the efficacy of the framework is demonstrated.
Ruh, Jonas Bruno - One of the best experts on this subject based on the ideXlab platform.
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Shale-related minibasins atop a massive olistostrome in an active accretionary wedge setting: Two-dimensional numerical modeling applied to the Iranian Makran
European Geosciences Union, 2020Co-Authors: Ruh, Jonas Bruno, Vergés Jaume, Burg Jean-pierreAbstract:EGU General Assembly in Viena, Austria,7–12 April 2019Minibasins are sagging synformal depocenters surrounded by upsurging Ductile Material. They are traditionallyrelated to salt tectonics. The onshore Iranian Makran accretionary wedge exhibits closed minibasins developedonto a regional-scale olistostrome with a shaly matrix. Two-dimensional numerical experiments were carried out toinvestigate whether the growth of such minibasins above a shale-dominated unit is feasible and how the presence ofa regional, shale-dominated olistostrome may affect the structural evolution of active accretionary wedges. Modelresults indicate that rapid mass-flow emplacement triggers thickening of the rear of the wedge while minibasinsgrow in a more frontal, tectonically quiet region. Further wedge growth leads to a jump forward of frontal accretion.Compared to the case history, this jump would explain the structural characteristics of the Coastal Makran in Iran
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Shale-related minibasins atop a massive olistostrome in an active accretionary wedge setting: Two-dimensional numerical modeling applied to the Iranian Makran
'Geological Society of America', 2018Co-Authors: Ruh, Jonas Bruno, Vergés Jaume, Burg Jean-pierreAbstract:Minibasins are sagging synformal depocenters surrounded by upsurging Ductile Material. They are traditionally related to salt tectonics. The onshore Iranian Makran accretionary wedge exhibits closed minibasins developed onto a regional-scale olistostrome with a shaly matrix. Two-dimensional numerical experiments were carried out to investigate whether the growth of such minibasins above a shale-dominated unit is feasible and how the presence of a regional, shale-dominated olistostrome may affect the structural evolution of active accretionary wedges. Model results indicate that rapid mass-flow emplacement triggers thickening of the rear of the wedge while minibasins grow in a more frontal, tectonically quiet region. Further wedge growth leads to a jump forward of frontal accretion. Compared to the case history, this jump would explain the structural characteristics of the Coastal Makran in Iran.Financial support was provided by the Swiss National Science Foundation (grants 2-77644-09 and 2-77297-15).Peer reviewe
L. De Lorenzis - One of the best experts on this subject based on the ideXlab platform.
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Phase-field modeling of Ductile fracture
Computational Mechanics, 2015Co-Authors: M. Ambati, T. Gerasimov, L. De LorenzisAbstract:Phase-field modeling of brittle fracture in elastic solids is a well-established framework that overcomes the limitations of the classical Griffith theory in the prediction of crack nucleation and in the identification of complicated crack paths including branching and merging. We propose a novel phase-field model for Ductile fracture of elasto-plastic solids in the quasi-static kinematically linear regime. The formulation is shown to capture the entire range of behavior of a Ductile Material exhibiting $$J_2$$ J 2 -plasticity, encompassing plasticization, crack initiation, propagation and failure. Several examples demonstrate the ability of the model to reproduce some important phenomenological features of Ductile fracture as reported in the experimental literature.
