FINITE ELEMENT SIMULATIONS OF A NEW METHOD TO THE FATIGUE LIFE ENHANCEMENT OF STRUCTURAL ELEMENTS WITH NONCIRCULAR OPENINGS
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- TITLE: FINITE ELEMENT SIMULATIONS OF A NEW METHOD TO THE FATIGUE LIFE ENHANCEMENT OF STRUCTURAL ELEMENTS WITH NONCIRCULAR OPENINGS
- ABSTRACT: The paper presents the outcomes from finite element simulations of a new method to enhancement of fatigue life of metal structural elements with noncircular openings. The method fulfils a process of “pure radial cold expansion” by means of a new patented tool. The study has been grounded on 3D finite element model of the process contains consecutively cold expansion of the preliminarily drilled two holes which correspond to the zones with fillets and next cutting the noncircular opening contour. On the basis of the finite element results it has been proved that the created compressive field around the fillet is symmetric in relation to the middle plane of the plate, i.e. the new method ensures the minimal axial gradient of the residual circumferential normal stresses. In conclusion, it have been determined the rational level of the degree of cold expansion – DCE=4%
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