Fracture toughness of laminated steels

✍ Scribed by N.G. Ohlson

• Publisher: Elsevier Science
• Year: 1974
• Tongue: English
• Weight: 929 KB
• Volume: 6
• Category: Article
• ISSN: 0013-7944
• DOI: 10.1016/0013-7944(74)90004-6

✦ Synopsis

Lamination occurs spontaneously in the transverse direction in many commercially available steel plates, if the transverse stresses are sufficiently high. Previous investigations have indicated that lamination is often accompanied by an improvement in the fracture toughness of the plate material. In the vicinity of the crack tip, the stress concentration is so large that the bond between adjacent layers will break before crack propagation sets in. If these layers are sufficiently thin, a state of plane stress is approached near the crack tip. In the present study, the infhrence of layer thickness and bond strength on the fracture toughness is investigated. It is shown that lamination does improve the toughness, if certain conditions in these variables are fulfilled. This offers a possibility to build up structures with high yield stress and high fracture toughness at the same time, since the permissible defect size to prevent unstable crack growth need not be uncomfortably small.