Решена задача о контактном взаимодействии элементов ствола электромагнитного ускорителя. Использовано двумерное упругое приближение. Расчетная область представляет собой одну четвертую часть поперечного сечения и включает в себя рельс, изолятор и силовую оболочку. Для решения задачи применен двухуровневый аддитивный метод Шварца, с помощью которого задача во всей области сведена к решению ряда локальных контактных задач во введенных подобластях. Представлены результаты трех расчетов: в первом применены реалистичные ортотропные свойства материалов, в двух других использованы изотропные приближения (для минимальных и максимальных значений модулей Юнга). Проведен сравнительный анализ напряженно-деформированного состояния ствола ускорителя для каждого случая.
The article discusses the implementation of the algorithm for solving axisymmetric contact problems of the thermoelasticity theory using the mortar method. This algorithm is used for numerical simulation of the contact interaction of several bodies under thermomechanical loading. The ill-conditioned system of linear algebraic equations obtained as a result of finite element discretization is numerically solved using the modified symmetric successive overrelaxation method (MSSOR), generalized to the case of contact of several bodies. The results of the algorithm application are demonstrated on a problem simulating some processes in a fuel element with a different number of bodies. The effect of the contacting bodies number and mesh steps on the number of iterations necessary to achieve a given accuracy while solving the system of equations is investigated.
An algorithm for solving axisymmetric contact problems of the theory of thermoelasticity with creep processes is considered. To take into account the contact interaction of bodies, the mortar method was used, a modified method of over relaxation was used to solve the obtained system of linear equations. For the test task, the resulting numerical solution is compared to the analytical solution. The results of application of the proposed algorithm for the demonstration problem simulating thermomechanical processes in the fuel element section including from 2 to 10 fuel pellets are presented..
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