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Autore:Giannella, Venanzio
Titolo:Enhanced FEM-DBEM approach for fatigue crack-growth simulation
Pubblicazione:: Universita degli studi di Salerno, 2018-12-13T14:55:10Z
Abstract: To comply with fatigue life requirements, it is often necessary to carry out fracture mechanics assessments of structural components undergoing cyclic loadings. Fatigue growth analyses of cracks is one of the most important aspects of the structural ...sments of structural components undergoing cyclic loadings. Fatigue growth analyses of cracks is one of the most important aspects of the structural integrity prediction for components (bars, wires, bolts, shafts, etc.) in presence of initial or accumulated in-service damage. Stresses and strains due to mechanical as well as thermal, electromagnetical, etc., loading conditions are typical for the components of engineering structures. The problem of residual fatigue life prediction of such type of structural elements is complex, and a closed form solution is usually not available because the applied loads not rarely lead to mixed-mode conditions. Frequently, engineering structures are modelled by using the Finite Element Method (FEM) due to the availability of many well-known commercial packages, a widespread use of the method and its well-known flexibility when dealing with complex structures. However, modelling crack-growth with FEM involves complex remeshing processes as the crack propagates, especially when mixed-mode conditions occur. Hence, extended FEMs (XFEMs) and meshless methods have been widely and successfully applied to crack propagation analyses in the last years. These techniques allow a mesh-independent crack representation, and remeshing is not even required to model the crack growth. The drawbacks of such mesh independency consist of high complexity of the finite elements, of material law formulation and solver algorithm. On the other hand, the Dual Boundary Element Method (DBEM) both simplifies the meshing processes and accurately characterizes the singular stress fields at the crack tips (linear assumption must be verified). Furthermore, it can be easily used in combination with FEM and, such a combination between DBEM and FEM, allows to simulate fracture problems leveraging on the high accuracy of DBEM when working on fracture, and on the versatility of FEM when working on complex structural problems... [edited by Author]
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Note:In relazione con PON 2000-2006 “Ricerca Scientifica, Sviluppo Tecnologico, Alta Formazione”. Regioni dell’Obiettivo 1 – Misura III.4 “Formazione superiore ed universitaria”
Autori secondari:Reverchon, Ernesto
Citarella, Roberto Guglielmo
Esposito, Renato
Risorsa digitale:Copia depositata in BNCF Repository di Ateneo
Copia depositata in BNCF Repository di Ateneo
Copia depositata in BNCF Repository di Ateneo
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200 1 |a Enhanced FEM-DBEM approach for fatigue crack-growth simulation  |b Tesi di dottorato 
210 1 |c Universita degli studi di Salerno  |d 2018-12-13T14:55:10Z 
300 |a In relazione con PON 2000-2006 “Ricerca Scientifica, Sviluppo Tecnologico, Alta Formazione”. Regioni dell’Obiettivo 1 – Misura III.4 “Formazione superiore ed universitaria” 
328 0 |b tesi di dottorato  |e Universita degli studi di Salerno 
330 |a 2016 - 2017  |a To comply with fatigue life requirements, it is often necessary to carry out fracture mechanics assessments of structural components undergoing cyclic loadings. Fatigue growth analyses of cracks is one of the most important aspects of the structural integrity prediction for components (bars, wires, bolts, shafts, etc.) in presence of initial or accumulated in-service damage. Stresses and strains due to mechanical as well as thermal, electromagnetical, etc., loading conditions are typical for the components of engineering structures. The problem of residual fatigue life prediction of such type of structural elements is complex, and a closed form solution is usually not available because the applied loads not rarely lead to mixed-mode conditions. Frequently, engineering structures are modelled by using the Finite Element Method (FEM) due to the availability of many well-known commercial packages, a widespread use of the method and its well-known flexibility when dealing with complex structures. However, modelling crack-growth with FEM involves complex remeshing processes as the crack propagates, especially when mixed-mode conditions occur. Hence, extended FEMs (XFEMs) and meshless methods have been widely and successfully applied to crack propagation analyses in the last years. These techniques allow a mesh-independent crack representation, and remeshing is not even required to model the crack growth. The drawbacks of such mesh independency consist of high complexity of the finite elements, of material law formulation and solver algorithm. On the other hand, the Dual Boundary Element Method (DBEM) both simplifies the meshing processes and accurately characterizes the singular stress fields at the crack tips (linear assumption must be verified). Furthermore, it can be easily used in combination with FEM and, such a combination between DBEM and FEM, allows to simulate fracture problems leveraging on the high accuracy of DBEM when working on fracture, and on the versatility of FEM when working on complex structural problems... [edited by Author] 
610 0 |a Finite Element Method (FEM) 
610 0 |a Dual Boundary Element Method (DBEM) 
700 0 |a Giannella, Venanzio 
702 0 |a Reverchon, Ernesto 
702 0 |a Citarella, Roberto Guglielmo 
702 0 |a Esposito, Renato 
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Tesi di dottorato | Lingua: | Paese: | BID: TD20019401
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