كواحد من قادة A Numerical Model For Ice Crushing On Concave الصناعة ، تسعى SBM دائمًا إلى الابتكار والتميز.
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The local crushing of ice is presented by the elastoplastic softening constitutive model of ice material, while the cracks caused by bending failures are realized by cohesive element method. Firstly, the proposed numerical models are introduced and the ice elastoplastic constitutive model is calibrated through simulating an ice crushing experiment. Then the continuous icebreaking process is
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The numerical ice material model was based on a crushable model (MAT 63) with modified material properties applied. To simulate the saw tooth load–displacement pattern, which is commonly observed in experiments in ice, an additional function of ''maximum principal stress'' failure criteria was
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Ice breaking process and patterns in level ice of ice breaking ship are numerically calculated in time domain. For commercial ice breaking ships, ice resistance increases excessively in ice breaking procedure with constant crushing stress. Thus, varying crushing stress depending on the velocity vectors and the contact area is newly introduced to reproduce its breaking patterns around the ships
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[A numerical model is proposed as well as during ice jam formation under the effect of a release wave. The model is based on the solution of onedimensional Saint Venant equations and Eksner''s continuity equation for the solid phase of transported material.] Brekhovskikh, Debolskaya, Debolsky, Mordasov (1997).
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· The numerical ice material model was based on a crushable model (MAT 63) with modified material properties applied. To simulate the saw tooth load–displacement pattern, which is commonly observed in experiments in ice, an additional function of ''maximum principal stress'' failure criteria was added.
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Numerical Simulation of Ice Ridge Breaking "EMSHIP" Erasmus Mundus Master Course, period of study September 2014 February 2016 3 ABSTRACT Increasing economic and industrial activities in Polar Regions require new engineering solutions to deal with arctic hazards. One of the main challenges for vessel navigation in ice are pressure ice ridges — sets of randomly oriented large pieces of
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The objective of this master thesis was to develop and implement algorithms in a numerical tool, capable of simulating the process of ship hull breaking through pressure ice ridge. The tool is based on the idea to implement Discrete Element Method (DEM) and corresponding code developed at Hamburg Ship Model Basin (HSVA) for simulation of ice ridges creation.
WhatsAppعرض المزيدthe corresponding numerical model, with variable ice thickness but still infinite ice strength, is compared to the Lagrangian one of Part 1 in sections 3 and 4. In section 5, then, ice strength is limited, and ice is allowed to yield. For the parameterization of ice strength, we rely on suggestions from the literature. (Note that, as we are not carrying out quantitative studies or direct
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A numerical model for ice crushing has been constructed that takes into account the physical processes identified in many experimental studies. These include the presence and evolution of highpressure and lowpressure zones, the rapid removal of ice through melting, and the transformation of relatively intact ice (highpressure zone material) to lowpressure pulverized ice through the creation
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A simplified numerical model is introduced to predict ice impact force acting on the ship hull in level ice condition. The model is based on icehull collision mechanisms and the essential ice breaking characteristics. The two critical ice failure modes, localized crushing and bending breaking, are addressed. An energy method is used to estimate the crushing force and the indentation
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point reaches to crushing strength of ice. Crushing leads to milled ice packs with several block sizes and an increased number of contact points. As a result, distinct gliding plane will develop when shear forces are applied. The smaller ice pieces may act like roller bearings for the bigger blocks and small pieces may also be compacted to become bigger mass. Ettema and Urroz (1989) stated
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The validated numerical model was in turn used toinvestigate and clarify issues that have not been previously icebreaker typically breaks ice by its power, its weight and a strengthened bowwith low stem angle. The continuous icebreaking process involves heave and pitchmotions that may not be negligible. The numerical procedure was formulated toaccount for all of the possible
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Gagnon [33] established a numerical model for ice crushing failure. Sopper [34] performed a series of ice crushing tests to investigate the e ects of external boundary conditions and geometric contact shapes under ice force. In fact, ice force and the seismic e ect have many similar characteristics,, both of them are dynamic and stochastic with a specific frequency spectrum. Referred to
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Abstract:A simplified numerical model is introduced to predict ice impact force acting on the ship hull in level ice condition. The model is based on icehull collision mechanisms and the essential ice breaking characteristics. The two critical ice failure modes, localized crushing and
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The isotropic elastoplastic material model is used for the level ice, in which ice crushing failure is considered. The effects of ice mesh size and ice failure strain on ice forces are investigated. The results indicate that these parameters have a significant effect on the ice crushing loads.
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A finite element sea ice model of the Canadian Arctic Archipelago, Ocean Dynamics 60, 1539‐1558, 2010 Modeled mean ice thickness for September 1979‐2009. Jeroen Hoving Delft University of Technology Arctic Battle Symposium ‐Friday, 09 March 2012 3 Numerical applications for icestructure interaction Current and past numerical modelling for ice‐structure
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The Numerical Setup and the Cohesive Zone Model The Numerical Setup The target of this paper is to simulate the bending failure of a wedge shaped ice with different numerical methods. Different from previous simulations, a contact scenario is set up in this study to obtain the boundary condition of the ice wedge in this study. A pressureover closure relationship is assumed to simulate
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Manual of numerical methods in concrete aims to present a unified approach for the available mathematical models of concrete, linking them to finite element analysis and to computer programs in which special provisions are made for concrete plasticity, cracking and crushing with and without concrete aggregate interlocking. Creep, temperature, and shrinkage formulations are included and
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The paper describes a numerical model to simulate the process of ship–ice interaction in realtime . New analytical closed form solutions are established and used to represent the ice breaking process. PhysX is used for the first time to solve the equations of rigid body motions in 6 degrees of freedom for all ice floes in the calculation domain. The results of the simulator are validated
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Abstract: A simplified numerical model is introduced to predict ice impact force acting on the ship hull in level ice condition. The model is based on icehull collision mechanisms and the essential ice breaking characteristics. The two critical ice failure modes, localized crushing and bending breaking, are addressed. An energy method is used to estimate the crushing force and the
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Numerical river ice models have become valuable tools for investigating many aspects of river ice. The accuracy of a numerical river ice model, as with all numerical models of physical systems, reflects the accuracy of the model input, the empirical coefficients (or parameters), and the model structure. The model input includes the description of the channel geometry, the timevarying boundary
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The proposed numerical simulation model was extended to a 25 cm diameter coneshaped ice specimen and a number of concaveshaped indenter cases were validated. Abstract Laboratory scale coneshaped ice compressive tests were performed, and a corresponding numerical simulation model using LSDYNA® was conducted. The numerical ice material model was based on a crushable model
WhatsAppعرض المزيدare made to find a numerical material model for ice that represents a wide range of measurements and is logical in terms of its physical characteristics. The Finite Element Method (FEM) can be combined with a failure criterion that simply deletes elements when a certain criterion is satisfied. In fact, the material behavior is more complex. Ice could still withstand compression as crushed
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The isotropic elastoplastic material model is used for the level ice, in which ice crushing failure is considered. The effects of ice mesh size and ice failure strain on ice forces are investigated. The results indicate that these parameters have a significant effect on the ice crushing loads. To validate and benchmark the numerical simulations, experimental data on level icewind turbine
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