SYMPOSIA PAPER Published: 01 January 1976
STP33939S

Application of the J-Integral to the Initiation of Crack Extension in a Titanium 6Al-4V Alloy

Source

Tests were conducted to determine JIc from resistance curves of J versus crack extension, obtained 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.

Results obtained with J computed from the equation, J = 2A/Bb, are compared to those obtained with the compliance technique, using the plane-stress solutions of Bucci et al. JIc results are compared with a valid KIc value for this material.

The range of ratios of crack length to specimen width (a/W) is explored over which the equation J = 2A/Bb applies. The decrease in crack extension at experimental limit load (Δapmax →Δac) is examined as the ratio of specimen thickness to uncracked ligament (B/b) is increased. Variation in JIc from specimens cut from different positions through the plate thickness is also examined.

Author Information

Yoder, GR
Naval Research Laboratory, Washington, D.C.
Griffis, CA
Naval Research Laboratory, Washington, D.C.
Price: $25.00
Contact Sales
Related
Reprints and Permissions
Reprints and copyright permissions can be requested through the
Copyright Clearance Center
Details
Developed by Committee: E08
Pages: 61–81
DOI: 10.1520/STP33939S
ISBN-EB: 978-0-8031-4669-3
ISBN-13: 978-0-8031-0509-6