A welded joint generally has heterogeneity of strength, material, and fracture toughness. It is important to understand the characteristics of the strength and fracture of welded joints while considering the heterogeneous effect. In particular, the material behavior becomes more complicated when the welded joint with strength heterogeneity is subjected to dynamic rapid loading; for example, the welded heat-affected zone of pipeline steels is softened and welded underground pipelines are affected by a rapid ground sliding in an earthquake. In this paper, the characteristics of the strength and fracture of an undermatched joint under dynamic loading are studied by round-bar tension tests and thermal elastic-plastic analyses. The results show that the strength and fracture characteristics of the undermatched joints should be evaluated based on the effects of the strain rate and the temperature, including the temperature rise during dynamic loading. The tensile strength and the yield stress of the undermatched joints increase with the strain rate and with the decreasing temperature. The strength of the undermatched zone approaches that of the base metal when the thickness of the undermatched zone becomes smaller, and it does not depend on the strain rate. Finally, it is found that the stress-strain distribution affects fracture characteristics such as ductile-to-brittle transition behavior. The fracture characteristics are explained and predicted from the results of stress-strain relations obtained by numerical analysis.
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June 2011
Research Papers
Prediction of Ductile-to-Brittle Transition Under Different Strain Rates in Undermatched Welded Joints
Masahito Mochizuki,
Masahito Mochizuki
Associate Professor
Mem. ASME
Member of JSME, HPi-J, JWS, and AWS of Department of Manufacturing Science, Graduate School of Engineering,
e-mail: mmochi@mapse.eng.osaka-u.ac.jp
Osaka University
, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
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Masao Toyoda
Masao Toyoda
Fellow
Department of Manufacturing Science, Graduate School of Engineering,
Osaka University
, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japan
Search for other works by this author on:
Masahito Mochizuki
Associate Professor
Mem. ASME
Member of JSME, HPi-J, JWS, and AWS of Department of Manufacturing Science, Graduate School of Engineering,
Osaka University
, 2-1 Yamada-oka, Suita, Osaka 565-0871, Japane-mail: mmochi@mapse.eng.osaka-u.ac.jp
Masao Toyoda
Fellow
Department of Manufacturing Science, Graduate School of Engineering,
Osaka University
, 2-1 Yamada-oka, Suita, Osaka 565-0871, JapanJ. Pressure Vessel Technol. Jun 2011, 133(3): 031401 (8 pages)
Published Online: March 29, 2011
Article history
Received:
November 12, 2006
Revised:
August 25, 2009
Online:
March 29, 2011
Published:
March 29, 2011
Citation
Mochizuki, M., and Toyoda, M. (March 29, 2011). "Prediction of Ductile-to-Brittle Transition Under Different Strain Rates in Undermatched Welded Joints." ASME. J. Pressure Vessel Technol. June 2011; 133(3): 031401. https://doi.org/10.1115/1.4002670
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