Crack Propagation In Compressive
Residual Stress Fields Of Crankshafts:
Experimental Study And Numerical Simulation
Author(s)
C. Gardin, S. Courtin, G. Bézine, D. Bertheau & H. Ben Hadj Hamouda
Abstract
This study deals with the influence of roller burnishing on fatigue crack
propagation in the fillet of a crankshaft. Destructive tests have enabled us to
obtain crack kinetics and shapes in a specimen close to the geometry of the
crankshaft. The beneficial effect of roller burnishing has been confirmed on both
crack initiation and propagation. Some cracks have even been stopped. These
mechanisms are likely to be linked to the compressive residual stresses induced,
and observed crack closure. At the same time, a numerical predictive method of
the crack propagation in roller-burnished specimens has also been implemented
and gives good results. It is based on a step-by-step process of stress intensity
factor calculations by elastic finite element analyses on models with an initial
roller burnishing stress field. A numerical modification concerning experimental
crack closure has to be considered. The proposed method and the developed
experimental discussion seem to possibly be extended to the case of the
crankshaft.
Keywords: crack propagation, fatigue, roller burnishing, fracture mechanics,
stress concentrators, crankshaft.
1 Introduction
Roller burnishing is a very commonly used industrial process. It involves a local
plastic deformation on surface that permits the fatigue strength of structures to be
increased. Crack propagation is indeed delayed by the introduction of
Keywords
crack propagation, fatigue, roller burnishing, fracture mechanics,
stress concentrators, crankshaft.
Related Book
Other papers in this volume
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