SYMPOSIA PAPER Published: 24 August 2020
STP791B1983012

Evaluation of * Parameter for Creep Crack Growth in Type 316 Stainless Steel

Source

The fracture mechanics approach to creep crack growth in Type 316 stainless steel at 593°C has been studied using compact tension and center-notched specimens. Crack growth rates were analyzed using the stress-intensity parameter K and strain energy rate parameter J*-integral to evaluate which of the two parameters correlates the growth rates better. The J* values were determined both by an elaborate data reduction scheme and by an analytical estimation procedure.

In terms of K the crack growth rates for the two specimen geometries form two distinct nonoverlapping bands indicating that K is not a valid parameter to characterize creep crack growth in this steel. In contrast, in terms of J* parameter, the growth rates overlap over a range of the parameter although there is considerable spread in the data. In spite of this spread, the J* parameter still is better than K to characterize the growth. The extent of the data spread in terms of J* is much larger than that observed at 650°C by other investigators. This larger spread at the lower temperature is attributed to the crack growth behavior, particularly to the formation of fissures at the crack tip, the nature and distribution of which varies with load.

Author Information

Sadananda, K.
Thermostructural Materials Branch, Materials Science and Technology Division, Naval Research Laboratory, Washington, D.C., US
Shahinian, P.
Thermostructural Materials Branch, Materials Science and Technology Division, Naval Research Laboratory, Washington, D.C., US
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: 182–196
DOI: 10.1520/STP791B1983012
ISBN-EB: 978-0-8031-7720-8
ISBN-13: 978-0-8031-0729-8