Comparison of crack-arrest fracture toughness between low and high heat-input thick weld specimens

Brittle crack-arrest fracture toughness ( K Ia ) was determined in low (1.5 kJ/mm) and high (53 kJ/mm) heat-input weld specimens with a large scale ( 1 × 1  m) and thickness (50 and 80 mm). An instant impact having energy of 2.7 kJ was imposed into the full-thickness notch tip at low temperature and...

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Bibliographic Details
Published in:International journal of fracture 2015-08, Vol.194 (2), p.197-203
Main Authors: An, Gyu Baek, Woo, Wanchuck, Park, Jeong Ung, Em, Vyacheslav
Format: Article
Language:English
Subjects:
Automotive Engineering
Brief Note
Brittle fracture
Characterization and Evaluation of Materials
Chemistry and Materials Science
Civil Engineering
Classical Mechanics
Correlation
Crack propagation
Fracture mechanics
Fracture toughness
Grain size
Heat treating
Impact strength
Materials Science
Mechanical Engineering
Notches
Thickness
Welded joints
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Summary:Brittle crack-arrest fracture toughness ( K Ia ) was determined in low (1.5 kJ/mm) and high (53 kJ/mm) heat-input weld specimens with a large scale ( 1 × 1  m) and thickness (50 and 80 mm). An instant impact having energy of 2.7 kJ was imposed into the full-thickness notch tip at low temperature and initiates crack propagation toward a higher temperature region where the crack stopped due to the improved fracture toughness. The relationship between the toughness and crack-arrest temperature provides the K Ia at - 10 ∘ C of about 2700 and 2200 N/mm 3 / 2 in the low and high heat-input weld specimens, respectively. This discrepancy was correlated to the grain size and Charpy impact energy of the notch region caused by the amounts of heat inputs in each weld specimen.
ISSN:0376-9429
1573-2673
DOI:10.1007/s10704-015-0041-2