On the mechanical stability of nanostructured coatings by synchrontron radiation

Thomas Tsakalakos, Mark Croft, Igor Zakharchenko, Zhong Zhong, Yuri Gulak, Ronald Holtz

Research output: Contribution to journalConference articlepeer-review

1 Scopus citations

Abstract

We have been successful in the development of two new powerful techniques, the Scattered Intensity Tomographic Profiling (SITP) and the Energy Dispersive X-ray Diffraction (EDXRD), to probe internal stresses in inhomogeneous solids. This represents a major breakthrough in the field of nondestructive evaluation of localized and global strains in nano/polycrystalline materials for depths from a few micrometers to a few centimeters. We measured triaxial residual stress depth profiles, directly and accurately, using synchrotron light source methods. We performed control experiments using cantilever beam specimens, which verified the accuracy of our method. Examples of residual stresses profiles will be presented which include: blank steel specimens, grit blasted steels, the effects of Nanostructured Coatings on steels substrates. The results on WC/Co and Al2O3/TiO2 nanocoatings confirm the expectation of large distributions of compressive and tensile stresses. A critical comparison of internal stress distributions between nano and micro size grain coatings will be presented on specimens undergone a number of different deformation processes such as elastic, plastic, wear and fatigue. The stress field profiling method conveniently bridges a crucial gap in the lexicon of direct/non-destructive strain profilometry.

Original languageEnglish (US)
Pages (from-to)885-895
Number of pages11
JournalCollection of Technical Papers - AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference
Volume2
StatePublished - Jan 1 2002
Event43rd Structures, Structural Dynamics and Materials Conference - Denver, CO, United States
Duration: Apr 22 2002Apr 25 2002

All Science Journal Classification (ASJC) codes

  • Architecture
  • Materials Science(all)
  • Aerospace Engineering
  • Mechanics of Materials
  • Mechanical Engineering

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