Accession Number:

ADA503540

Title:

Mean vs. Life-Limiting Fatigue Behavior of a Nickel-Based Superalloy (Postprint)

Descriptive Note:

Conference proceedings

Corporate Author:

UNIVERSAL TECHNOLOGY CORP DAYTON OH

Personal Author(s):

Report Date:

2008-09-01

Pagination or Media Count:

10.0

Abstract:

The mean and the life-limiting behavior under fatigue of the nickel-based superalloy, IN100, separated or converged as a function of stress level and dwell loading. This behavior was related to the control of the life-limiting behavior by the small-crack growth regime, producing its much slower response to stress level and dwell-time, relative to the mean-lifetime behavior. The lifetime probability density is therefore, modeled as a superposition of the crack growth lifetime density and a mean-lifetime density. The crack growth density is calculated with the help of small-crack growth data and the distribution in the crack initiation size. The mean-lifetime density is estimated from a relatively small number of total lifetime fatigue tests. In IN100, we apply this approach to predict the effects of stress level and dwell time on the lifetime distribution and the B0.1 1 in 1000 probability of failure lifetime limit.

Subject Categories:

  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE