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This content will become publicly available on June 6, 2017

Title: A crystal plasticity-based study of the relationship between microstructure and ultra-high-cycle fatigue life in nickel titanium alloys

Nickel Titanium (NiTi) alloys are often used in biomedical devices where failure due to mechanical fatigue is common. For other alloy systems, computational models have proven an effective means of determining the relationship between microstructural features and fatigue life. This work will extend the subset of those models which were based on crystal plasticity to examine the relationship between microstructure and fatigue life in NiTi alloys. It will explore the interaction between a spherical inclusion and the material’s free surface along with several NiTi microstructures reconstructed from 3D imaging. This work will determine the distance at which the free surface interacts with an inclusion and the effect of applied strain of surface-inclusion interaction. The effects of inclusion-inclusion interaction, matrix voiding, and matrix strengthening are explored and ranked with regards to their influence on fatigue life.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2] ;  [5]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States); Northwestern Univ., Evanston, IL (United States). Dept. of Mechanical Engineering
  2. Northwestern Univ., Evanston, IL (United States). Dept. of Materials Science and Engineering
  3. QuesTek Inovations LLC,Evanston, IL (United States)
  4. Harvard Univ., Cambridge, MA (United States). School of Engineering and Applied Sciences (SEAS)
  5. Northwestern Univ., Evanston, IL (United States). Dept. of Mechanical Engineering
Publication Date:
OSTI Identifier:
1305843
Report Number(s):
LLNL-JRNL--675697
Journal ID: ISSN 0142-1123
Grant/Contract Number:
AC52-07NA27344; 70NANB13Hl94; 70NANB14H012
Type:
Accepted Manuscript
Journal Name:
International Journal of Fatigue
Additional Journal Information:
Journal Volume: 91; Journal Issue: P1; Journal ID: ISSN 0142-1123
Publisher:
Elsevier
Research Org:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE Microstructures; Finite elements; Surface effects; Image-based modeling