NUMERICAL FINITE ELEMENT ANALYSIS OF RESIDUAL STRESSES GENERATED BY TREATED PHASE CHANGES IN THERMICALLY STELLS / ANÁLISE NUMÉRICA POR ELEMENTOS FINITOS DE TENSÕES RESIDUAIS GERADAS POR MUDANÇA DE FASE EM AÇOS TRATADOS TERMICAMENTE

AUTOR(ES)

MARCELLO GOULART TEIXEIRA

DATA DE PUBLICAÇÃO

2002

RESUMO

The objective of this thesis is to perform a finite element analysis of residual stress in Fe-Ni alloys and carbon steel heat-treated pieces, considering phase changes. To achieve this goal, a object oriented computer code for the non-linear thermal analysis coupled with a code for a micro-structural analysis were developed. OPP codes were also created for an elasto-plastic analysis, with temperature distribution and constituents partial fraction as input data. The material properties are considered dependent on both the temperature and the partial fraction for all analyses.In the thermal treatment, the martensite transformation according to Koistinen &Marburger (1959) scheme and the diffusional formation of pearlite and bainite according to Avrami (1939) are considered. Finally, a new model to calculate the kinetics parameters of the diffusional austenite-pearlite and austenite-bainite transformations is presented.

ASSUNTO(S)

phase change tensoes residuais elementos finitos mudanca de fase finite elements residual stresses

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