AVALIAÇÃO EXPERIMENTAL DOS PARÂMETROS DE TENACIDADE CTOD E INTEGRAL J EM ESPÉCIMES DE FLEXÃO SE(B) UTILIZANDO O MÉTODO ETA
EXPERIMENTAL EVALUATION OF CTOD AND J INTEGRAL TOUGHNESS PARAMETERS FOR BEND SPECIMENS SE(B) USING THE ETA METHOD
Donato, Gustavo H. B.; Cravero, Sebastian; Ruggieri, Claudio
http://dx.doi.org/10.4322/tmm.00302006
Tecnol. Metal. Mater., vol.3, n2, p.29-33, 2006
Resumo
Este trabalho apresenta um procedimento para determinação experimental dos parâmetros de tenacidade J e CTOD em espécimes de flexão SE(B) utilizando o método eta. O objetivo central é a obtenção de fatores adimensionais h ( e t a ) calibrados numericamente e aplicáveis a uma faixa abrangente de dimensões relativas de trincas (0.05 £ a / W £ 0 . 7 ) e propriedades de encruamento do material. Os resultados das análises permitem estabelecer curvas do fator adimensional h em função da dimensão da trinca (a/W) e das propriedades de encruamento do material as quais permitirão a determinação mais acurada dos parâmetros J e CTOD obtidos experimentalmente.
Palavras-chave
Integral J, CTOD, Método ETA
Abstract
This work presents an estimation procedure to determine the fracture toughness parameters J and CTOD for SE(B) specimens using the eta method. The main purpose is to obtain numerically calibrated h (eta) factors which are applicable to an extensive range of relative crack dimensions (0.05 £ a/W £ 0.7) and material hardening properties. The analysis results enable the construction of functional forms which describe the variation of the h factors with crack size (a/W) and material hardening properties, n. The procedure provides more accurate toughness values of J and CTOD from laboratory experimental measurements of fracture toughness.
Keywords
J Integral, CTOD, ETA method
Referências
1 ANDERSON, T. L. Fracture mechanics: fundaments and applications. 3rd Ed. New York: CRC Press, 2005.
2 AMERICAN SOCIETY FOR TESTING AND MATERIALS. ASTM E-1820: Standard test methods for measurements of fracture toughness. West Conshohocken, PA, 1996.
3 AMERICAN SOCIETY FOR TESTING AND MATERIALS. ASTM E-1290: Standard test method for crack-tip opening displacement (ctod) fracture toughness measurement. West Conshohocken, PA,1993.
4 BRITISH STANDARD. BS 7448: Fracture mechanics toughness tests – Part I: method for determination of KIc, critical CTOD and critical j values of metallic materials. London, 1991.
5 KOPPENHOEFER, K., GULLERUD, A., RUGGIERI, C., DODDS, R.; HEALY, B. WARP3D: dynamic non-linear analysis of solids using preconditioned conjugated gradient software architecture. Urbana Champaign: University of Illinois, 1994. (Structural Research Series (SRS) 596, UILU-ENG-94-2017)
6 OHATA, M. The effect of specimen geometry on CTOD -values based upon the local approach. 1993. [Ms.C. Thesis - Department of Manufacturing Science]. Osaka: Osaka University, 1993. [Em Japonês].
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