The aim of the present work was the assessment of the impact of deep-rolling and shot-peening performed in the underhead and in the unthreaded shank of two high strength screws (36 NiCrMo and 42 CrMoV) for fatigue life enhancement. The experimental campaign consisted of six combinations, including the non-treated state. The aforementioned treatments were evaluated alone or with shot-peening performed after deep-rolling in the underhead fillet of the screws. Deep rolling was carried out at the optimal rolling force, whereas two shot diameters were considered for shot-peening (Z100 and UFS70). The results have been evaluated in terms of fatigue limits and factor effects have been assessed by marginal mean plots.
Effects of Surface Treatments on the Fatigue Response of High Strength Fasteners / Reggiani, Barbara; Olmi, Giorgio; Orazi, Leonardo; Tomesani, Luca; Fini, Stefano; Barozzi, Lorenzo; Pelaccia, Riccardo; Bandini, Michele. - 813:(2019), pp. 352-357. (Intervento presentato al convegno SMT33 - 33rd International Conference on Surfcae Modification Technologies tenutosi a Napoli nel 26-27-28 Giugno 2019) [10.4028/www.scientific.net/KEM.813.352].
Effects of Surface Treatments on the Fatigue Response of High Strength Fasteners
Barbara Reggiani
;Leonardo Orazi;Riccardo Pelaccia;
2019
Abstract
The aim of the present work was the assessment of the impact of deep-rolling and shot-peening performed in the underhead and in the unthreaded shank of two high strength screws (36 NiCrMo and 42 CrMoV) for fatigue life enhancement. The experimental campaign consisted of six combinations, including the non-treated state. The aforementioned treatments were evaluated alone or with shot-peening performed after deep-rolling in the underhead fillet of the screws. Deep rolling was carried out at the optimal rolling force, whereas two shot diameters were considered for shot-peening (Z100 and UFS70). The results have been evaluated in terms of fatigue limits and factor effects have been assessed by marginal mean plots.
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