STP1220

    The J Integral as a Fracture Criterion of Robber-Like Materials:A Comparative Study Between a Compliance Method and an Energy Separation Method

    Published: Jan 1995


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    Abstract

    The expression of the energetic parameter J proposed by Andrews is re-examined and the influence of finite dimensions is introduced, leading to a general expression of the form J=k(W0).W0.F(aw).a

    In this work, fracture tests have been performed on an EPDM based polymer, using two kinds of specimen geometry.

    The different terms of this expression are identified using two different approaches:- the first one is based upon a compliance method; - the second one is an energy separation procedure we have developed. Interesting results have been pointed out in this work: - In first, SENT and CCT specimen leads to a similar function k(W0) which is clearly depending on both the non linear behaviour of the material and of conditions of loading. - Secondly, when considering CCT specimen, the calibration factor F(a/w), derived from the second method, is in good agreement with the Linear Elastic Fracture Mechanics (LEFM) equivalent one. - At least, concerning the deeply cracked specimens, the J estimation using the above mentioned multiplicative form and the direct evaluation from the energy rate dU*/dA give quite concordant results.

    Keywords:

    Fracture, J-integral, crack initiation, rubber, polymer, calibration factor, finite size effects


    Author Information:

    NaÏt-Abdelaziz, M
    Assistant professor, assistant and professor, Laboratoire de Mecanique de Lille, IUT GMP, villeneuve d'Ascq,

    Ghfiri, H
    Assistant professor, assistant and professor, Laboratoire de Mecanique de Lille, IUT GMP, villeneuve d'Ascq,

    Mesmacque, G
    Assistant professor, assistant and professor, Laboratoire de Mecanique de Lille, IUT GMP, villeneuve d'Ascq,

    Nevière, RG
    Research scientist, Centre de Recherches du Bouchet, Vert-Le Petit,


    Paper ID: STP14605S

    Committee/Subcommittee: E08.06

    DOI: 10.1520/STP14605S


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