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RISS 인기검색어
- 검색키워드
- 저자 : Giuseppe Marannano (검색결과 2 건)
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Giuseppe Marannano,Francesco Parrinello,Antonio Giallanza 대한기계학회 2016 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.30 No.3
The generation of permanent compressive stresses around the holes is recognized as a valuable mean to delay the onset and propagation of the defects and to extend the fatigue life of the mechanical components. In the work, a bilateral indentation process, performed on each side of the component, is widely used in order to create a residual circumferential stress field around the area to be drilled and that persists after the drilling operation. In order to evaluate the process parameters and to identify optimal geometric solutions, several static and fatigue tests are conducted on AW 6082-T6 aluminum alloy specimen where two holes are created. In particular, experimental tests on only drilled specimens (OD) and specimens subjected to Indentation process (IP) varying the indentation depth and the center-tocenter distance of the holes are performed. Several numerical analyses, conducted in ANSYS APDL environment with explicit solver, allow to determine the influence of the distance between two adjacent holes and the effect of the indentation depth on the residual stress distribution.
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Effect of the indentation process on fatigue life of drilled specimens
Giuseppe Marannano,Antonino Pasta,Francesco Parrinello,Antonio Giallanza 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.7
Design and manufacture of mechanical elements are strongly influenced by the evaluation of the residual stresses due to their effectson the material strength. This paper presents numerical and experimental results performed on AW 6082-T6 aluminum alloy drilledspecimens when the hole is created after a bilateral indentation process. The plastic deformation induced by the indenters creates a compressiveresidual stress field around the hole, which persists after the drilling operation. Several numerical analysis have been carried outin ANSYS APDL explicit solver for different indentation depths and hole diameters in order to evaluate the compressive circumferentialstresses, optimal process parameters and relevant geometric features. Fatigue tests are performed in order to determine the cycles to failureand the corresponding Wöhler diagram.
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