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Use of a Ring DWTT Specimen for Determination of Steel NDT from Pipe of Diameter Less than DN500

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Abstract

It has become recognized that the drop weight tearing test (DWTT) energy better represents the ductile fracture resistance of pipe steels since it utilizes a specimen that has the full thickness of the pipe and has a fracture path long enough to reach steady-state fracture resistance. However, the API 5L code does not require it for pipe sizes less than DN500. The aim of this paper is to propose a DWTT specific to small diameter pipes based on a new specimen, the ring drop weight tearing test (RDWTT) specimen; to evaluate the transition temperature T t, DWTT and nil ductility temperature of the pipe steel API 5L X65; to introduce the transition temperature T t, DWTT in the transition temperature material master curve of the API 5L X65 steel; and to compare the prediction of the crack ductile extension in a pipe based on the RDWTT’s energy and crack tip opening angle in the case of the steel API 5L X65.

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Authors and Affiliations

  1. ENIM, 57078, Metz, France

    M. Ben Amara, J. Capelle & Z. Azari

  2. FM.C, 57530, Silly sur Nied, France

    G. Pluvinage

Authors
  1. M. Ben Amara
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  2. J. Capelle
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  3. Z. Azari
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  4. G. Pluvinage
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Correspondence to G. Pluvinage.

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Ben Amara, M., Capelle, J., Azari, Z. et al. Use of a Ring DWTT Specimen for Determination of Steel NDT from Pipe of Diameter Less than DN500. J Fail. Anal. and Preven. 16, 941–950 (2016). https://doi.org/10.1007/s11668-016-0194-y

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