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Fracture mechanics and fatigue crack propagation in armor steel welds.

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Title: Fracture mechanics and fatigue crack propagation in armor steel welds.
Authors: Cabrilo, Aleksandar1 (AUTHOR) cabrilo@uns.ac.rs, Sedmak, Aleksandar2 (AUTHOR), Burzic, Zijah3 (AUTHOR), Perkovic, Srdja3 (AUTHOR)
Source: Engineering Failure Analysis. Dec2019, Vol. 106, pN.PAG-N.PAG. 1p.
Subjects: Crack propagation, Steel welding, Armored military vehicles, Fatigue crack growth, Welded joints, Metalwork, Material fatigue
Abstract: The welding process of armor steel is a complex process due to possible welding faults appearing in all zones of weld metal joint in the form of cracks and pores, as results of high percentage of carbon in the base metal. Military armored vehicles, are exposed to dynamic and impact loads. Hence, it is important to know the fracture toughness and fatigue crack propagation in all zones of the weld joint. Fatigue crack propagation testing was made on SEN (B) specimens. Fatigue threshold for weld metal is the lowest ΔKth = 10.1 MPa*m1/2, and for base metal is the highest ΔKth = 13.4 MPa*m1/2, while the notch values in HAZ is ΔKth = 12.6 MPa*m1/2. Due to a significant interest in quantification of material resistance to crack initiation and propagation, the fatigue crack growth rate was measured in the base metal, HAZ and welded metal zone. Accordingly, the most important attention should be paid to the zone of the base metal, while the weld metal and HAZ are safe zones. • Good tensile characteristics of welded joints can be achieved by automated welding due to more intensive mixing of the base and filler material. • The highest resistance to crack propagation in relation to all zones of welded joint has the heat affected zone and weld metal. • The most important attention should be paid to the zone of the base metal, where the danger is a crack of length of ~ 6 mm, while the weld metal and HAZ are safe zones. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:The welding process of armor steel is a complex process due to possible welding faults appearing in all zones of weld metal joint in the form of cracks and pores, as results of high percentage of carbon in the base metal. Military armored vehicles, are exposed to dynamic and impact loads. Hence, it is important to know the fracture toughness and fatigue crack propagation in all zones of the weld joint. Fatigue crack propagation testing was made on SEN (B) specimens. Fatigue threshold for weld metal is the lowest ΔKth = 10.1 MPa*m1/2, and for base metal is the highest ΔKth = 13.4 MPa*m1/2, while the notch values in HAZ is ΔKth = 12.6 MPa*m1/2. Due to a significant interest in quantification of material resistance to crack initiation and propagation, the fatigue crack growth rate was measured in the base metal, HAZ and welded metal zone. Accordingly, the most important attention should be paid to the zone of the base metal, while the weld metal and HAZ are safe zones. • Good tensile characteristics of welded joints can be achieved by automated welding due to more intensive mixing of the base and filler material. • The highest resistance to crack propagation in relation to all zones of welded joint has the heat affected zone and weld metal. • The most important attention should be paid to the zone of the base metal, where the danger is a crack of length of ~ 6 mm, while the weld metal and HAZ are safe zones. [ABSTRACT FROM AUTHOR]
ISSN:13506307
DOI:10.1016/j.engfailanal.2019.104155