ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Experimental analysis can be very costly and time consuming when searching for theoptimal process parameters of a new shot-peening configuration (new material, new geometry of thepart…).The prediction of compressive residual stresses in shot-peened parts has been an active field ofresearch for the past fifteen years and several finite elements models have been proposed. Thesemodels, although they give interesting qualitative results, over-estimate, most of the time, the levelof the maximal compressive stresses.A better comprehension of the phenomena and of the influence of the parameters used in the modelcan only carry a notable improvement to the prediction of the stresses. The fact that the loading pathis cyclic and is not radial led us to think that a model including kinematic hardening would be betteradapted for the modelling of shot peening.In this article we present the results of a simulation of a double impact for several constitutive laws.We study the effect of the chosen constitutive law on the level of residual stresses and, in particular,we show that kinematic hardening, even identified on the same tensile curve than isotropichardening, leads to lower stress levels as compared with isotropic hardening. Furthermore, theoverall shape of the stress distribution within the depth is significantly different for the two types ofhardening behaviour.Further, in order to check the modelisations, local measurements were carried on with X-raydiffraction on a large size impact and correlated with the topography of the impact
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.161.pdf
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