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Pre-strain effect of on fracture performance of high-strength steel welds.

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Title: Pre-strain effect of on fracture performance of high-strength steel welds.
Authors: An, Gyubaek1, Park, Jeong-Ung2 jupark@chosun.ac.kr, Ohata, Mituru3, Minami, Fumiyoshi4
Source: Journal of Mechanical Science & Technology. Jul2018, Vol. 32 Issue 7, p3145-3151. 7p.
Subjects: Steel welding, High strength steel, Metal fractures, Strains & stresses (Mechanics), Fracture toughness
Abstract: Fracture toughness of pre-strain effect was determined as a function of the temperature in structural steels of the 600 to 780 MPa class. Cyclic loading during earthquakes produces pre-strain in the component, which is enhanced at the region of strain concentration. During the Kobe Great Earthquake in 1995 in Japan, 10 to 15 % pre-strain was recorded at the beam-to-column connection. The relationship between critical CTOD and CGHAZ length was sampled by fatigue pre-crack for pre-strained HAZ, which is a significant decrease compared to that of the base metal. Furthermore, the effect of pre-strain is discussed in terms of the CTOD and Charpy impact energy of the local brittle zone. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Fracture toughness of pre-strain effect was determined as a function of the temperature in structural steels of the 600 to 780 MPa class. Cyclic loading during earthquakes produces pre-strain in the component, which is enhanced at the region of strain concentration. During the Kobe Great Earthquake in 1995 in Japan, 10 to 15 % pre-strain was recorded at the beam-to-column connection. The relationship between critical CTOD and CGHAZ length was sampled by fatigue pre-crack for pre-strained HAZ, which is a significant decrease compared to that of the base metal. Furthermore, the effect of pre-strain is discussed in terms of the CTOD and Charpy impact energy of the local brittle zone. [ABSTRACT FROM AUTHOR]
ISSN:1738494X
DOI:10.1007/s12206-018-0617-7