Elastoplastic stress-strain behavior at notch roots in sheet specimens under constant-amplitude loading
John H. Crews, United States. National Aeronautics and Space Administration, Langley Research Center
National Aeronautics and Space Administration, 1969 - Science - 33 pages
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2024-T3 aluminum alloy 30 cycles AISI 4130 normalized calculating local stress companion specimen companion-specimen method concentration factors CONSTANT-AMPLITUDE LOADING curves for equation cycle of reversed cyclic loading cyclic stress cyclic stress-strain curve dashed curves Edge-notched sheet specimens elastic stress-concentration factor ELASTOPLASTIC STRESS-STRAIN BEHAVIOR Estimated local stress estimates of stabilized experimental curves experimental results fatigue figure 15 full-cycle residual stresses K-pSmax value Kexp Krp values KrpSmax ksi MN/m2 KTSmax Langley Research Center loading cycle material maximum and minimum minimum stabilized minimum stresses MN/nA modified Stowell equation monotonic local stress monotonic nominal stress NACA nominal net-section stress normalized and stress notch root notched specimens procedure represent residual stress-strain residual stress-strain values reversed loading roots for cyclic SAE 4130 normalized shown in figure Smax Stabilization of experimental stabilized local stress strain at notch strain gages strain histories strain-gage readings stress and strain stress relieved symbols represent residual U.S. Customary Unit uniaxial unnotched