Journal of the Society of Naval Architects of Japan · 1975 · 26 citations · 2 references
EngineeringMechanical EngineeringFatigue Crack GrowthFatigueFracture ModelingStructural MaterialsDynamic Crack PropagationStrength PropertyStressstrain AnalysisSurface Crack GrowthMaterials ScienceMechanical BehaviorSemi-elliptical Surface CrackSolid MechanicsBending Fatigue ProcessLow-cycle FatigueCombined TensileCrack FormationStructural MechanicsDamage EvolutionMechanics Of MaterialsFracture Mechanics
Fatigue tests have been carried out under combined tensile and bending loading on plate specimens containing a surface flaw.The characteristics of fatigue crack growth are studied by a crack-morphological approach. Surface crack growth exhibits two different modes ; “equilibrated growth” and “non-equilibrated growth”. Experimental results are well characterized by the following formulas, a/ (bn-b0n) 1/n= (0.98+0.07RB) - (0.06 + 0.94RB) ·a/hdb/dN=C [(ΔσT+ΔσB/2) · (πb) 1/2] mThe direct application of Paris formula using numerical solutions of stress intensity factor in semi-elliptical surface crack has not much advantage in precision nor in simplification of analysis.
2