Abstract
The development of crack closure load with increasing crack length for noncrystallographic transgranular surface microcracks produced by cyclic fatigue of Al 2219-T851 is studied for two environmental relative humidities (5 and 30 pct). Closure loads are found to be initially low for short cracks and increase with subsequent crack propagation. The increase in closure with crack length is faster if the humidity is low or if the initiation crack size is large, as determined by the size of the surface intermetallic particle initiation site. At 30 pct humidity it is possible to associate the closure load increase observed to a decreasing crack planarity with increasing crack length.
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