Nowadays, the Finite Element Analysis method is widely used, including in the field of fracture mechanics, because to the grown of computing power. Numerical modeling of fracture mechanics is a developing method in the Ice-Structure Interaction field. One of the approaches to modeling ice failure is the Finite Element Method with Element Erosion Technique, which is widely used among researchers. However, the question of using a material model that most accurately describes the behavior of ice taking into account its physical and mechanical characteristics remains open. Also, researchers often overlook the question of the strain rate effect on the values of ice load. This article presents the results of numerical modeling of the interaction of level ice with a conical support of offshore structure. The dependences of the ice load value on the ice velocity are also presented and compared with the results obtained according to regulatory documents.
В последние годы выполнено большое количество численных экспериментов для оценки величины воздействия льда на сооружения континентального шельфа с использованием различных моделей материалов. Однако корректных обоснований для применения таких моделей сравнительно мало. В связи с этим вопрос о достоверности характера поведения моделируемого льда, испытывающего значительные деформации, остается открытым. Хотя во многих программных комплексах имеется возможность интеграции сторонних моделей, созданных для описания поведения материалов под нагрузкой, использование этого инструмента требует от пользователя дополнительных знаний и навыков. В связи с этим в данной работе проведен анализ конститутивных моделей пластичности материала, имеющихся в базовых библиотеках программных комплексов ANSYS и SIMULIA Abaqus и учитывающих различные факторы, которые оказывают значительное влияние на прочностные характеристики льда. Для данных моделей выполнен анализ параметров, влияющих на критерий начала пластического течения. Сделан вывод о возможности и целесообразности применения рассмотренных моделей для различных условий. Проведен обзор численных исследований процессов взаимодействия в системе «лед–сооружение», выполненных различными авторами, в части применяемых конститутивных моделей.
: In recent years, a large number of numerical experiments have been performed to estimate the magnitude of the impact of ice on offshore structures, with a variety of used material models. However, there are relatively few correct substantiations for using such models. In this regard,
the question of reliability of the behavior of the modeled ice undergoing significant deformations
remains open. Although in many software systems it is possible to integrate side user-defined models designed to describe the behavior of materials under load, the use of this tool requires the user to
apply additional knowledge and skills. In this regard, this paper analyzes the constitutive models of
plasticity of the material available in the ANSYS and SIMULIA Abaqus software packages which
properly consider various factors that have a significant effect on the strength characteristics of ice.
For these models, the analysis of parameters affecting the criterion of the onset of plastic flow is
carried out. Conclusions are made on the possibility and advisability of using the considered models
for various conditions. A review of numerical studies of the processes of interaction in the icestructure system performed by various authors, regarding the applied constitutive models, is carried
out.
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