Fatigue life prediction of shot peened components

 

R.A. Cláudio^*1, J.M. Silva², C.M. Branco³, J. Byrne⁴

 

¹Department of Mechanical Engineering, ESTSetúbal/Instituto Politécnico de Setúbal, Campus do IPS, Estefanilha, 2910-761 Setúbal.

²Department of Aerospace Sciences, Universidade da Beira Interior, Edifício II das Engenharias, 6201-001, Covilhã.

³Department of Mechanical Engineering, Instituto Superior Técnico, Av. Rovisco Pais, 1049-001 Lisboa.

⁴Department of Mechanical and Design Engineering, University of Portsmouth, Portsmouth, Hants PO1 3DJ, UK

rclaudio@est.ips.pt

 

ABSTRACT: Shot peening is one of the most effective surface treatments in order to prevent crack initiation and early crack propagation. Part of the studies to determine the fatigue performance of shot peening are based on experimental tests. Almost no work is published related with the prediction of shot peening behaviour. The present paper evaluates the ability of the current methodologies, used to predict fatigue life, on components treated with shot peening. The Finite Element Method was used to determine the stress, strain and strain energy due to shot peening of some specimens tested experimentally. These results were used to apply methods to predict the total fatigue life. A final discussion is presented about the ability of the methods used, to predict the fatigue life of the specimens tested experimentally.

Keywords: Shot Peening, Fatigue Life Prediction, Finite Element Method.

 

RESUMO: A grenalhagem é um dos tratamentos mais eficientes na prevenção da iniciação de fendas por fadiga e na fase inicial de propagação. Grande parte dos estudos sobre o feito da grenalhagem no comportamento à fadiga são experimentais. Praticamente não existem trabalhos publicados relativos ao estudo de previsão do comportamento da grenalhagem. Neste trabalho são usados modelos tradicionais, de determinação da vida à fadiga, em componentes grenalhados. O método dos elementos finitos é usado para determinar a tensão, extensão e energia de deformação de provetes grenalhados que foram testados experimentalmente. Estes resultados são usados em modelos de previsão da vida total à fadiga. É apresentada uma discussão sobre a capacidade dos modelos usados na previsão de vida à fadiga de provetes que foram testados experimentalmente.

Palavras chave: Grenalhagem, Previsão de Vida à Fadiga, Método dos Elementos Finitos.

 

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