Abstract Fatigue crack growth after single-cycle peak overload was investigated in Ti-6Al-4V sheet. Strain hardening was determined not to be the major controlling mechanism retarding crack growth after peak over-load, but instead, strain hardening slightly accelerated crack growth for the case when strain hardening was induced prior to crack initiation. Crack growth after peak overload was characterized by: (1) no effect after 20 per cent overload: (2) crack arrest immediately following 70 and 100 per cent overloads; (3) subsequent retarded crack growth rates after 70 and 100 per cent overloads; and (4) retardation but no arrest following 50 per cent overload. The Wheeler model of crack growth retardation was investigated. The physical appearance of post-test fracture surfaces were as hypothesized by the Elber concept of crack closure after overload. The The recovery of an overloaded crack was linear with respect to the constant load amplitude cyclic stress intensity.
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