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    Effect of stress wave propagation phenomenon on the determination of strain energy density theory parameters and dynamic J-integral
    (Wiley, 2023) Saribay, Murat
    Dynamic loading for stationary cracks leads to results that are many times greater in magnitude than their static counterparts. If the dynamic loading is in the form of impact type, stress wave propagation effects become dominant. FRAC3D program comprises enriched element formulation which doesn't require excessive mesh refinement around crack tip for accuracy. Strain energy density (SED) theory parameters and dynamic J-integral are sought in this study to simulate and understand wave propagation phenomenon in detail. Structures under the effect of wave propagations yield more reliable J-integral values by taking the average of the results from multiple domain sizes. Governed by stress waves, space-time variations of minimum energy density locations strongly influence fracture characterization for straight and curved crack fronts. Details given in numerical examples section of this paper make a great contribution to understanding of the response for cracked structures subjected to sudden loading.
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    Local and global energy densities associated with welding residual stresses of cracked structures
    (Elsevier, 2020) Saribay, Murat
    The residual stresses associated with fusion welding processes have recently become a popular issue considering the reliable design of structural components. In a welding problem, it is quite common that fracture is observed to initiate either directly from the welds or from fatigue cracks that develop in the weld's heat affected zone (HAZ). A recent study has investigated the effects of subsequent dynamic loading with stationary crack fronts, which assumes load being applied to the structure following the welding process. To analyze these types of problems, a computational procedure based on finite element methodology is developed to integrate the welding residual stresses with subsequent dynamic fracture behavior. The welding analysis is performed with a welding simulation program (SYSWELD). The inclusion of residual stresses and the determination of classical fracture parameters are handled with a specialized finite element program, called FRAC3D. The calculation of energy densities that are recently used in the analysis of cracked structures was shown to be an effective method for the solution of fracture problems. In this paper, a new methodology that is developed to determine local and global energy densities for the simulation of dynamic fracture behavior with initial welding residual stresses is presented.
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    Multiprocessing implementations for time-dependent fracture analysis of an electronic packaging structure
    (Korean Soc Mechanical Engineers, 2023) Saribay, Murat
    Investigation of fracture mechanics problems with computational tools has always been a great challenge due to singularities present at the crack tip. FRAC3D is an effective finite element tool that benefits from enriched element methodology. The dynamic version of this code enables the analysis of structures with stationary cracks subjected to impact loading. Response of the components in these problems are highly influenced by stress wave propagation phenomenon. In this study, bimaterial interface cracking in an electronic packaging structure is analyzed considering transient behavior. Besides the complications associated with the finite element solution of such a problem, long computational times may also be an issue considering model sizes. Multiprocessing of finite element codes could save significant times if corresponding algorithms are restructured with parallel processing tools in an efficient form. Up to 75 % reductions in time for the given example were obtained by using newly implemented multiprocessing code.