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Title: Finite Elements Model of Shot Peening, Effects of Constitutive Laws of the Material
Author: Rouhaud Ouakka Ould Chaboche François
Source: Conf Proc: ICSP-9 (pg 107-112)
Publication year 2005
Document number: 2005059
Number of pages: 6
Abstract:
ABSTRACT
While very useful to understand the phenomena at hand, experiments can be very costly and time consuming if done for the purpose of setting a new set of shot peening
parameters for the treatment of a new part. In the last 15 years, many finite element models have been proposed. Existing simulations show their efficiency to better
understand the mechanism of residual stress introduction and better evaluate the influence of the shot peening parameters on the residual stress profile although some
discrepancies still remain.
It is not necessary to say that the constitutive law chosen to model the shot peened material strongly influences the residual stress field obtained after finite element
computation. In this paper, we wish to address the following question:
Should the model take kinematic hardening into account?
Indeed, with a kinematic hardening model, plastic effects can appear during unloading as well as during loading. It seems very likely that such effects do appear during shot
peening. Further, kinematic hardening effects are particularly influential when the loading is cyclic. As the numbers of impacts at one location on a shot peened surface
with a high coverage can be important, cyclic effects do occur during the process. We thus discuss the different options offered for constitutive laws with a presentation of
numerical strategies for cyclic plasticity modeling and the residual stress field obtained.
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