Load Ratio and Environmental Effects on Fatigue Crack Growth Rates for Several Ship Steels

Fatigue crack growth rate tests were conducted on HY-100, high tensile steel (HS) and medium carbon ship steels. Tests were conducted in air at 5 Hz and in 3.5 percent NaCl salt water under freely corroding conditions at 0.5 Hz. Load ratios of 0.10, 0.67 and 0.80 were investigated in both environmen...

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Bibliographic Details
Main Authors: Gill, S J, Crooker, T W
Format: Report
Language:English
Subjects:
AIR
CARBON STEELS
CRACK PROPAGATION
CRACKING(FRACTURING)
CYCLIC TESTS
FATIGUE TESTS(MECHANICS)
FRACTURE(MECHANICS)
GROWTH(GENERAL)
LITERATURE SURVEYS
LOADS(FORCES)
Marine Engineering
Mechanics
PE62343N
Properties of Metals and Alloys
RATES
RATIOS
SALT SPRAY TESTS
SHIP HULLS
SHIP STRUCTURAL COMPONENTS
STEEL HY-100
STRESS CORROSION
STRUCTURAL STEEL
TENSILE STRENGTH
WU1086
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Summary:Fatigue crack growth rate tests were conducted on HY-100, high tensile steel (HS) and medium carbon ship steels. Tests were conducted in air at 5 Hz and in 3.5 percent NaCl salt water under freely corroding conditions at 0.5 Hz. Load ratios of 0.10, 0.67 and 0.80 were investigated in both environments. For data gathered in air, crack growth rates (da/dN) were insensitive to stress ratio and the data conformed to a Paris power law relationship between da/dN and stress-intensity range (delta K). Salt water exerted a minor effect on da/dN in the HS and medium carbon steels. However, in the higher strength HY-100, a combination of salt water and high load ratios accelerated crack growth rates by approximately a factor of five.