Accession Number:

ADA523967

Title:

Simulated Microstructure-Sensitive Extreme Value Probabilities for High Cycle Fatigue of Duplex Ti-6Al-4V

Descriptive Note:

Journal article (preprint)

Corporate Author:

GEORGIA INST OF TECH ATLANTA SCHOOL OF MATERIALS SCIENCE AND ENGINEERING

Report Date:

2010-04-01

Pagination or Media Count:

49.0

Abstract:

A newly developed microstructure-sensitive extreme value probabilistic framework for fatigue variability based on computational polycrystal plasticity is exercised to compare the driving forces for fatigue crack formation nucleation and early growth at room temperature for four different microstructure variants of duplex a Ti-alloy. The aforementioned probabilistic framework links certain extreme value fatigue response parameters with microstructure attributes at fatigue critical sites through use of marked correlation functions. By applying this framework to study the driving forces for fatigue crack formation in these microstructure variants of Ti-4V, these microstructures can be ranked in terms of relative high cycle fatigue HCF performance and the correlated microstructure attributes that have the most influence on the predicted fatigue response can be identified. Nonlocal fatigue indicator parameters FIPs based on the cyclic plastic strain averaged over domains on the length scale of the microstructure attributes e.g. grains, phases are used to estimate the driving forces for fatigue crack formation are estimated using these FIPs.

Subject Categories:

  • Inorganic Chemistry
  • Properties of Metals and Alloys

Distribution Statement:

APPROVED FOR PUBLIC RELEASE