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An efficient method for the identification of the modified Cockroft–Latham fracture criterion at elevated temperature

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Abstract

The paper presents the theoretical part of a method for the identification of the modified Cockroft–Latham ductile fracture criterion at elevated temperature. Quite a general viscoplastic model is adopted to describe material behavior. The original criterion is path-dependent and involves stresses. Therefore, the identification of constitutive parameters of this criterion, as well as many other ductile fracture criteria, is rather a difficult task that usually includes experimental research and numerical simulation. The latter is impossible without a precisely specified material model and boundary conditions. It is shown in the present paper that for a wide class of material models usually used to describe the behavior of materials at elevated temperatures, the criterion is significantly simplified when the site of fracture initiation is located on traction-free surfaces. In particular, this reduced criterion solely depends on two in-surface logarithmic strains. Since there are well-established experimental procedures to measure surface strains, the result obtained can be considered as a theoretical basis for the efficient method for the identification of the modified Cockroft–Latham ductile fracture criterion at elevated temperature.

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Authors and Affiliations

  1. A.Yu. Ishlinskii Institute for Problems in Mechanics, Russian Academy of Sciences, 101-1 Prospect Vernadskogo, 119526, Moscow, Russia

    Sergei Alexandrov

  2. Department of Mechanical Engineering and Advanced Institute for Manufacturing with High-tech Innovations, National Chung Cheng University, Chia-Yi, 62102, Taiwan

    Sergei Alexandrov & Yeau-Ren Jeng

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  1. Sergei Alexandrov
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  2. Yeau-Ren Jeng
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Alexandrov, S., Jeng, YR. An efficient method for the identification of the modified Cockroft–Latham fracture criterion at elevated temperature. Arch Appl Mech 83, 1801–1804 (2013). https://doi.org/10.1007/s00419-013-0779-9

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  • DOI: https://doi.org/10.1007/s00419-013-0779-9

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