A generalized parametric approach to creep crack growth

Journal Article · Sun Jan 01 04:00:00 EST 1984 · Scr. Metall.; (United States)

DOI:https://doi.org/10.1016/0036-9748(84)90088-7· OSTI ID:6468997

Radhakrishnan, V M; McEvily, A J

The topic of creep crack growth has attracted increased attention in recent years. However, as yet no generally valid means for relating experimental data to a relatively simple correlating parameter such as K, the stress intensity factor, or C*, the creep equivalent to Rice's J-integral, has been established. In retrospect this lack of correlation may not be surprising in view of the variation in behavior of different alloys, e.g., creep brittle vs. creep ductile, as well as the uncertainty as to whether or not the assumed test conditions, usually steady state creep, are actually being realized in the process zone at the advancing crack tip. As an alternative a straightforward parametric approach has been proposed in which the load point deflection rate, ..delta.., is expressed as a function of the crack growth rate, a, and the load P in the following form. A correlation of creep crack growth data for the creep ductile aluminum alloy 6061 has been obtained in terms of a parameter which involves the deflection rate and bending moment for two types of pin-loaded specimens.

• Research Organization: DMRL, Hyderband
• OSTI ID: 6468997
• Journal Information: Scr. Metall.; (United States), Journal Name: Scr. Metall.; (United States) Vol. 18:1; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
BRITTLENESS
CORRELATIONS
CRACK PROPAGATION
CREEP
CRYSTAL DEFECTS
CRYSTAL STRUCTURE
DUCTILITY
DYNAMIC LOADS
FRACTURE MECHANICS
GEOMETRY
MATHEMATICS
MECHANICAL PROPERTIES
MECHANICS
POINT DEFECTS
STRESS ANALYSIS
STRESS INTENSITY FACTORS
TENSILE PROPERTIES