Simulation and visualization of the mechanical components have become a predominant phase during the design and the production stages. Several means are used to improve the design and to reduce study time. Today, the powerful hardware and the software available on the market have contributed greatly on the improvement of design, visualization and manufacturing process of complex parts (turbine blade). In this context, our study is a contribution to the establishment of a methodology to a CAD modelling and finite element analysis, which allows us to identify the mechanical behavior of a gas turbine blade. The profile of the blade turbine model is obtained after regeneration using the CATIA V5R20 software from the retro-design technique using a FARO-type scanner. The turbine blade is analyzed under a static mechanical behavior. It has been observed that the maximum stresses and deformations are located in the vicinity of the root and the upper surface along the turbine blade. On the other hand, the elastic energy is located at a distance from the root of the turbine blade.
In the present work, an analysis of influence of the notch on the toughness of material KI is presented. A notched plate made out of structural steel is considered and subjected to uniformly tensile loading. Different values of angle and notch radius were selected. The material is assumed to be elastic perfectly plastic and the analysis was made according to a local approach defined by the volumetric approach. The parameters of the volumetric approach are the effective distance, effective stress and relative stress gradient and are determined by using the finite element method (F.E.M). The variation of the weight function affects the calculation of effective stress. The results obtained are confronted with models of Irwin and Creager - Paris. The results obtained show that for small radii, the stress intensity factor calculated by the weight function unit is close to those obtained by the models of Irwin and Creager-Paris. The increasing in the notch angle influences on the assessment of fracture toughness.
This study has used the strain energy density (SED) approach to evaluate the stress intensity factor (SIF) of cracked cruciform welded joints in Hardox 450 steel. A microstructural analysis was made of Hardox 450 steel which is composed of refined and tempered low carbon martensite. The obtained results of simulation will be compared with those provided by J-integral methode for different enriched zones and contours based on the extended finite element method (XFEM) coupled with the level set technique (LST). Crack initiation and propagation under cyclic loading have been adopted for the modeling of cruciform welded joints.
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