ELASTIC-PLASTIC HYSTERESIS LOOPS INDUCED BY COMPLEX LOADING / LAÇOS DE HISTERESE ELASTOPLÁSTICOS GERADOS SOB CARREGAMENTO COMPLEXOS

AUTOR(ES)
FONTE

IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia

DATA DE PUBLICAÇÃO

17/01/2000

RESUMO

The main objective of this work was to experimentally study the cyclic elastoplastic behavior under complex leading of two structural steels, named API S-135 and AISI 4340. In order to minimize experimental errors, some problems were studied with unusual care. The influence of the residual bending moment on the EN tests was measured, using a special specimen instrumented with eight strain-gagers. The performance of the clip-gage was checked with a calibration in the test specimen was quantified. And the inelastic buckling of the tst specimen under hysteresis loops of constant amplitude was modeled, considering the effects of cyclic softening. The experimental results include EN tests under constant amplitude of deformation, to obtain the Coffin-Manson and the Ramberg-Osgood curves of the two steels. The softening transient was studied, and the best way to measure the cyclic strain hardening constant K and exponent N in order to optimize the description of the stable hysteresis loops was discussed. This optimization is fundamental for the correct modeling of the complex loops done in the ViDa 99 program. Finally, predicted and experimentally measured loops were successfully compared.

ASSUNTO(S)

fadiga fatigue lacos de histerese hysteresis loops

ACESSO AO ARTIGO

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