LeafSpring1.pdf - See discussions stats and author profiles for this publication at https\/www.researchgate.net\/publication\/236174303 Residual stresses

LeafSpring1.pdf - See discussions stats and author profiles...

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See discussions, stats, and author profiles for this publication at: Residual stresses induced by shot-peening and fatigue durability of leaf springs Conference Paper · August 2012 CITATIONS 5 READS 2,162 3 authors: Some of the authors of this publication are also working on these related projects: Poster ABM-2 View project Development of Intermetallics View project Bruno Geoffroy Scuracchio Sampa USA 25 PUBLICATIONS 46 CITATIONS SEE PROFILE Nelson Batista de Lima Instituto de Pesquisas Energéticas e Nucleares 123 PUBLICATIONS 522 CITATIONS SEE PROFILE Cláudio Geraldo Schön University of São Paulo 133 PUBLICATIONS 714 CITATIONS SEE PROFILE All content following this page was uploaded by Cláudio Geraldo Schön on 22 May 2014. The user has requested enhancement of the downloaded file.
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Residual Stresses Induced by Shot-Peening and Fatigue Durability of Leaf Springs Scuracchio, Bruno Geoffroy 1 * , Lima, Nelson Batista 2 and Schön, Cláudio Geraldo 3 1 ThyssenKrupp Bilstein Brasil, Av. Abrahão Gonçalves Braga, 4, 04186-902, São Paulo, SP, Brazil. [email protected] 2 Comissão Nacional de Energia Nuclear, Instituto de Pesquisas Energéticas e Nucleares, Departamento de Caracterização de Materiais, Travessa R, 400, Cidade Universitária, 05508-900, São Paulo, SP, Brazil. [email protected] 3 Department of Metallurgical and Materials Engineering, Escola Politécnica da Universidade de São Paulo, Av. Prof. Mello Moraes, 2463, 05508-900, São Paulo, SP, Brazil. [email protected] * [email protected] Keywords: shot-blast, shot-peening, automotive springs, x-ray diffraction, residual stresses, fatigue life Abstract. The improvement of fatigue life in parts subjected to cyclic stresses by application of mechanical surface treatment processes is already well known, both in the industry and in the academy. Dealing with automotive springs, the shot peening process becomes an essential step in manufacturing these parts. In the case of leaf springs, however, a systematic investigation of the effect of shot peening on fatigue life is still required. The aim of this work is to improve the knowledge of shot peening on leaf springs for vehicles, through the analysis of residual stresses by x-ray diffraction and fatigue tests on a series of samples that were subject to ten different peening schedules. Among the investigated processes, the usage of 1.0 mm diameter cast steel shot followed by a second peening with 0.3 mm diameter cast steel shot leads to better performance, regarding fatigue life. X-ray diffraction analysis shows that this improved performance is may be attributed to residual compressive stress maintained until a depth of 0.05 mm below the surface, which directly influences the fatigue crack nucleation. Residual stresses induced by shot-peening in larger depths, have no influence on sample fatigue life, showing that crack propagation is not affected by the induced residual stresses. Consequently, the durability of parts is improved by shot-peening exclusively due to this influence on crack nucleation at sample’s surface.
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