Abstract
Double edge notched axial compression specimens taken from thick welded steel joints have been used to grow fatigue craks under pulsating compressive loads at mean stresses up to 50% of that needed for general yielding. The redistribution of residual stresses during specimen preparation and during crack growth influences the nucleation, growth rate and extent of fatigue cracks. Crack growth rates which are comparable to the equivalent tensile situation have been observed in as-welded, welded plus overloaded and stress relieved plus overloaded joints. Multiple nucleation and curved crack profiles have been observed in all cases.
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