THE EFFECT OF INTERMEDIATE HEAT TREATMENTS ON OVERLOAD INDUCED RETARDATIONS DURING FATIGUE CRACK GROWTH IN AN Al-ALLOY

— Crack growth fatigue tests were carried out on 2024‐T3 specimens. Constant‐amplitude loading was periodically interrupted by 10 overload cycles. Intermediate heat treatments (T4) were applied to remove the residual stress in the crack tip zone and the crack closure wake behind the crack tip. Retar...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 1992-05, Vol.15 (5), p.421-430
Main Authors: Ling, M. R., Schijve, J.
Format: Article
Language:English
Subjects:
aluminum alloys
crack propagation
fatigue testing
heat treatment
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Summary:— Crack growth fatigue tests were carried out on 2024‐T3 specimens. Constant‐amplitude loading was periodically interrupted by 10 overload cycles. Intermediate heat treatments (T4) were applied to remove the residual stress in the crack tip zone and the crack closure wake behind the crack tip. Retardation effects induced by crack closure due to the previous load history were fully erased by the heat treatments. Overload effects were easily introduced again by new overload cycles afterwards. Crack growth rate results and fractographic observations indicate that primary crack tip plastic deformation (in virgin material) is more effective for crack extension than secondary plastic deformation in an existing plastic zone. This conclusion is significant for cycle‐by‐cycle crack growth prediction models for variable‐amplitude loading.
ISSN:8756-758X
1460-2695
DOI:10.1111/j.1460-2695.1992.tb01284.x