1995 Volume 60 Issue 468 Pages 147-154
To obtain fracture toughness of inner corner part of cold formed steel rectangular hollow section, we carried out charpy impact test on SS400 and SM490A structural steel plates of 25mm thickness ,that are supplied compressive pre-strain ,0%〜20%, and tack welding. Results are mainly as follows. (1) The more compressive pre-strain value, transition curve moves to the higher temperature area, further that of welded steel plates moves the highest temperature area. (2) More than 10% pre-strained steel plates supplied welding show the highest transition temperature. (3) The fracture toughness of corner part of cold formed rectangular hollow section becomes very small.
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