非線形最小二乗法による炭素鋼の動的構成式推定 : 実験データによる検討

概要

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An entimation method for dynamic consitutive equations using the experimental data of strain time curves and the residual strain profile induced in a finite-length bar applied to longitudinal impact is described. The estimation was performed by means of the nonlinear least squares based on the Gauss-Newton method assuming the constitutive equation forms were given. The previous report explained that the method was applicable to estimation of dynamic consitutive equations for aluminium, stress-strain relations for which are weakly dependent on strain rates. In this study, in order to confirm that the present method could be applied to the estimation of dynamic consitutive equations of carbons steels, stress-strain relationships of which are highly depndent on strain rates, the estimations were performed using actual experimental data. Furthermore, by the comparison of estimated results and experimental results regarding stress-strain relationships with strain rates, it was clarified that the method might be applied to estimation of the dynamic constitutive equations of carbon steels.
1993-07-25