Formability Evaluation of Steel Tubes Using a Simplified Hydraulic Bulging Test

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  • KUWABARA Toshihiko
    Division of Advanced Materials Science and Technology, Graduate School,Institute of Symbiotic Science and Technology, Tokyo University of Agriculture and Technology
  • MORIGUCHI Kyosuke
    Graduate School of Engineering, Department of Mechanical Systems Engineering, Tokyo University of Agriculture and Technology

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Other Title
  • 簡易液圧バルジ試験法による鋼管の成形性評価
  • カンイ エキアツ バルジ シケンホウ ニ ヨル コウカン ノ セイケイセイ ヒョウカ

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Abstract

A simple testing device for evaluating the formability of metal tubes is proposed. In this testing device a tubular specimen is subjected to internal hydraulic pressure to bulge freely with both ends sealed simply using O-rings; thus it bulges under a near uniaxial tension stress state in the circumferential direction. Formability tests using the hydraulic bulging device are performed for eight kinds of electric resistance welded tubes with different mechanical properties, thickness and manufacturing processes. The manufacturing processes of the tubes are classified into three groups: as-rolled, as-rolled and normalized and cold-drawn and normalized. It is found that the uniformity of initial thickness distribution of the tubes significantly depends on the manufacturing process and that the more uniform the thickness, the higher the formability (the limit strain in the circumferential direction) of the tube. The cold-drawn and normalized tubes exhibit anomalous bulging behavior; they do not bulge axisymmetrically and do not burst at the center of the tube. The anomalous behavior of the cold drawn and normalized tubes is successfully reproduced by a FEM analysis taking account of the inhomogeneous thickness and work hardening characteristics of the tube.

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 91 (12), 868-874, 2005

    The Iron and Steel Institute of Japan

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