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EFFECT OF DISPLACEMENT RATES ON EAC OF AISI 4340 STEEL
Author(s) -
Dietzel,
Subhas Ghosal
Publication year - 1998
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1046/j.1460-2695.1998.00100.x
Subject(s) - materials science , metallurgy , displacement (psychology) , psychology , psychotherapist
The environmentally assisted cracking (EAC) of AISI 4340 steel in synthetic ocean water was investigated using the rising displacement test method. The stress intensity factor for crack initiation, K init , in precracked compact tension specimens, was observed to increase with the displacement rates. However, a critical displacement rate existed which was associated with the K IEAC of the steel in the environment. Here, K IEAC is the threshold value of the stress intensity factor below which no EAC is expected. Constant load and constant deflection tests resulted in similar K IEAC values. The method pursued in this investigation for the determination of the initial displacement rate needed to obtain a valid K IEAC was found to be quite effective for the rapid and satisfactory evaluation of K IEAC , requiring a minimum number of tests.