Fatigue crack growth behavior of an 8090 Al-Li alloy under mixed mode 1--mode 3 loading conditions

Journal Article · Mon Nov 15 00:00:00 EST 1993 · Scripta Metallurgica et Materialia

DOI:https://doi.org/10.1016/0956-716X(93)90141-E· OSTI ID:139986

Kamat, S V; Prasad, N E ^[1]

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1. Defence Metallurgical Research Lab., Hyderabad (India)

Aluminum-lithium alloys have evoked considerable interest in recent years because of their high specific strengths and stiffness. An additional advantage of these alloys is their superior fatigue crack growth resistance as compared to the conventional aluminium alloys. However, most of the fatigue crack growth investigations have dealt with crack propagation behavior under mode 1 and loading. A recent study on monotonic fracture behavior of 8090 Al-Li alloys has shown that these alloys possess lower fracture toughness under mode 3 loading as compared to mode 1 loading. The fracture resistance under mixed mode 1 - mode 3 loading was also found to be lower than that under pure mode 1 loading. However, no experimental data is available on the mixed mode 1--mode 3 fatigue crack growth behavior in Al-Li alloys. The objective of the present paper is to study the effect of combined mode 1--mode 3 loading on the fatigue crack growth behavior of an 8090 Al-Li alloy.

• OSTI ID: 139986
• Journal Information: Scripta Metallurgica et Materialia, Vol. 29, Issue 10; Other Information: PBD: 15 Nov 1993
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM BASE ALLOYS
CRACK PROPAGATION
LITHIUM ALLOYS
FATIGUE
STATIC LOADS
DYNAMIC LOADS