Abstract
Fatigue tests of aluminum-silicone alloy were carried out under compressive load using round bars with circumferential notch. Cracks were observed propagating at the notch bottom of the specimens that were not fractured after 1×107 cycles under the repeated compressive load. The change of the stress intensity factor range ΔK accompanied by the crack propagation was studied based on fracture mechanics, considering the residual tensile stress distribution due to the plastic deformation. The applied and residual stresses were calculated by elastic-plastic finite element method. Compared with the estimated ΔK and ΔKth of short crack taking intrinsic crack length α0 into consideration, it is verified that in a notched specimens under compressive load a crack initiates but will stop in short, because ΔK decreases in accordance with crack propagation and being below ΔKth.
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