The Effects of Surface Layer on Plastic Deformation and Crack Propagation
MARTIN MARIETTA AEROSPACE DENVER CO
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Final rept.,FKramer,Irvin R. DAAG46-70-C-0102, ARPA Order- 188AMMRCCR-71-26aluminum alloys, crack propagation, titanium alloys, crack propagation, steel, crack propagation, crack propagation, metals, stresses, fatiguemechanics, surface properties, vanadium alloys, deformationaluminum alloy 2014, plastic deformation, steel 4130, titanium alloy 6al 4vThe crack propagation of 2014-T6 aluminum, titanium 6Al-4V, and 4130 steel YS 180,000 psi was measured under plane stress and plane strain, and a comparison was made to determine the effect of eliminating or decreasing the surface layer on the cracking resistance of the specimens. It was also shown that when specimens of 2014-T6 aluminum, titanium 6Al-4V, and 4130 steel were fatigued, the surface-layer stress increased. The number of cycles required to initiate a propagating crack was determined.
- Metallurgy and Metallography