Перегляд за Автор "Dimitrova, Svetlana"
Зараз показуємо 1 - 3 з 3
Результатів на сторінці
Налаштування сортування
Документ Dynamics and fracture of impacted sandwich composites under time varying loads: Numerical modelling and simulations(CongressLine Ltd., Hungary, 2017) Burlayenko, Vyacheslav. N.; Sadowski, Tomasz; Dimitrova, SvetlanaIn this study, the dynamics and fracture of sandwich plates containing a pre-existing skin-to-core interfacial damage and subinterfacial core damage induced by an incident impact is examined. The dynamic response of sandwich plates with debonding that is allowed to be growing with a time, is simulated by using the finite element method within the ABAQUS code. The forced vibration analysis of impact-damaged sandwich plates is carried out accounting for contact and friction conditions within the debonded region in the simulations with ABAQUS. The damage mechanics approach implemented into ABAQUS via cohesive elements is used for modelling the debonding propagation under impulsive and harmonic loading. The influence of the skin-to-core debonding growth on the global nonlinear dynamics and strength of the sandwich plates is studied in detail.Документ Nonlinear fracture dynamics of double cantilever beam sandwich specimens(Sapienza University of Rome, 2019) Burlayenko, V. N.; Sadowski, Tomasz; Dimitrova, SvetlanaA virtual testing of double cantilever beam interlaminar fracture toughness sandwich specimens under different types of dynamic loads and loading rates is considered. The nonlinear dynamic response of those sandwich specimens being fractured during the test is numerically examined using the two-dimensional finite element model within the ABAQUSTM code. The interaction integral method is exploited to extract the dynamic stress intensity factor. Cohesive elements allocated along the face/core interface are used to simulate the dynamic fracturing of the specimens.Документ Three-dimensional free vibration analysis of thermally loaded fgm sandwich plates(2020) Burlayenko, V. N.; Sadowski, Tomasz; Dimitrova, SvetlanaUsing the finite element code ABAQUS and the user-defined material utilities UMAT and UMATHT, a solid brick graded finite element is developed for three-dimensional (3D) modeling of free vibrations of thermally loaded functionally gradient material (FGM) sandwich plates. The mechanical and thermal material properties of the FGM sandwich plates are assumed to vary gradually in the thickness direction, according to a power-law fraction distribution. Benchmark problems are firstly considered to assess the performance and accuracy of the proposed 3D graded finite element. Comparisons with the reference solutions revealed high efficiency and good capabilities of the developed element for the 3D simulations of thermomechanical and vibration responses of FGM sandwich plates. Some parametric studies are carried out for the frequency analysis by varying the volume fraction profile and the temperature distribution across the plate thickness.