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Crack tip fields in a viscoplastic solid: monotonic and cyclic loading

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Abstract

The asymptotic stress and strain field near the tip of a plane strain Mode I stationary crack in a viscoplastic material are investigated in this work, using a unified viscoplastic model based on Chaboche (Int J Plast 5(3):247–302, 1989). Asymptotic analysis shows that the near tip stress field is governed by the Hutchinson–Rice–Rosengren (HRR) field (Hutchinson in J Mech Phys Solids 16(1):13–31, 1968; Rice and Rosengren in J Mech Phys Solids 16(1):1–12, 1968) with a time dependent amplitude that depends on the loading history. Finite element analysis is carried out for a single edge crack specimen subjected to a constant applied load and a simple class of cyclic loading history. The focus is on small scale creep where the region of inelasticity is small in comparison with typical specimen dimensions. For the case of constant load, the amplitude of the HRR field is found to vanish at long times and the elastic K field dominates. For the case of cyclic loading, we study the effect of stress ratio on inelastic strain and find that the strain accumulated per cycle decreases with stress ratio.

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Authors and Affiliations

  1. Mechanical and Aerospace Engineering, Cornell University, Ithaca, NY, 14850, USA

    Jing Ning

  2. Field of Theoretical and Applied Mechanics, Cornell University, Ithaca, NY, 14850, USA

    Chung Yuen Hui

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  1. Jing Ning
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  2. Chung Yuen Hui
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Correspondence to Chung Yuen Hui.

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Ning, J., Hui, C.Y. Crack tip fields in a viscoplastic solid: monotonic and cyclic loading. Int J Fract 175, 39–51 (2012). https://doi.org/10.1007/s10704-012-9699-x

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