OBSERVATIONS ON USE OF THE J INTEGRAL TO DETERMINE PLANE-STRAIN FRACTURE TOUGHNESS FROM SUBSIZED SPECIMENS OF A TITANIUM 6AL-4V ALLOY
J-integral procedures were used to obtain resistance curves of J versus crack extension from fatigue-precracked specimens of a titanium 6Al-4V alloy. Specimens of various geometries were employed, all in three-point bending. Crack extensions were delineated by heat tinting. The value of the J integral at the initiation of crack extension, J sub Ic, was determined from the resistance curves and compared with a valid K sub Ic value for this material. Comparison was made of the results obtained with the approximation equation J = 2A/Bb to those obtained with the more cumbersome compliance technique in which the analytical plane-stress solutions of Bucci et al. were used. The range of ratios of crack length to specimen width was examined over which J = 2A/Bb holds, as was the decrease in crack extension at the experimental limit load with increase in ratio of specimen thickness to uncracked ligament. Variation in J sub Ic from specimens cut from different positions through the plate thickness was also explored. (Author)
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Corporate Authors:
Naval Research Laboratory
4555 Overlook Avenue, SW
Washington, DC United States 20375-5320 -
Authors:
- Yoder, G R
- Griffis, C A
- Publication Date: 1974-9-3
Media Info
- Pagination: 21 p.
Subject/Index Terms
- TRT Terms: Cracking; Fracture mechanics; Fracture properties; Stresses
- Uncontrolled Terms: Crack propagation; Stress intensity factors
- Subject Areas: Marine Transportation; Materials;
Filing Info
- Accession Number: 00084821
- Record Type: Publication
- Source Agency: National Technical Information Service
- Report/Paper Numbers: NRL-7789 Final Rpt.
- Files: TRIS
- Created Date: May 19 1975 12:00AM