NUMERICAL MODELLING OF SHOT PEENING AND STRESS PEENING PROCESSES APPLIED TO PARABOLIC LEAF SPRINGS

Authors

  • MIGUEL ANGEL GONZALES CALLE DEPARTMENT OF MECHATRONICS AND MECHANICAL SYSTEMS, POLYTECHNIC SCHOOL OF THE UNIVERSITY OF SãO PAULO
  • DANIEL BARRIOS BENíTEZ DEPARTMENT OF MECHANICAL ENGINEERING, MACKENZIE PRESBYTERIAN UNIVERSITY
  • NELSON BATISTA LIMA MATERIALS SCIENCE AND TECHNOLOGY CENTRE, NUCLEAR AND ENERGETIC RESEARCH INSTITUTE
  • EDISON GONçALVES DEPARTMENT OF MECHATRONICS AND MECHANICAL SYSTEMS, POLYTECHNIC SCHOOL OF THE UNIVERSITY OF SãO PAULO

Keywords:

SHOT PEENING, STRESS PEENING, RESIDUAL STRESSES, AUTOMOTIVE LEAF SPRING

Abstract

SHOT PEENING IS A COLD-WORKING MECHANICAL PROCESS IN WHICH A SHOT STREAM IS PROPELLED AGAINST A COMPONENT SURFACE. ITS PURPOSE IS TO INTRODUCE COMPRESSIVE RESIDUAL STRESSES ON COMPONENT SURFACES FOR INCREASING THE FATIGUE RESISTANCE. THIS PROCESS IS WIDELY APPLIED IN SPRINGS DUE TO THE CYCLICAL LOADS REQUIREMENTS. AN IMPROVED VARIANT FOR LEAF SPRINGS IS THE STRESS PEENING IN WHICH A FLEXION PRE-LOAD IS IMPOSED TO BEND THE LEAF SPRING WHILE CONVENTIONAL SHOT PEENING IS APPLIED. IT RESULTS IN INCREASING THE PEENING INTENSITY. THIS PAPER PRESENTS A NUMERICAL MODELLING OF SHOT AND STRESS PEENING PROCESSES USING THE FINITE ELEMENT METHOD. THE RESULTS ARE COMPARED WITH EXPERIMENTAL MEASUREMENTS OF THE RESIDUAL STRESSES IN LEAF SPRINGS SUBMITTED TO THESE PROCESSES. FOR THE EXPERIMENTAL MEASUREMENTS WAS USED THE X-RAY DIFFRACTION AND THE INCREMENTAL HOLE DRILLING TECHNIQUE (IHDT). FURTHERMORE, THE RESULTS ARE COMPARED WITH EMPIRICAL CORRELATIONS AND NUMERICAL MODELLINGS DEVELOPED BY OTHER AUTHORS.

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Published

2010-03-13

Issue

Vol. 7 No. 1 (2010)

Section

Articles

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