Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern Research Station
Help
 

Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

View PDF (1.7 MB)

Title: Evaluation of crack-tip stress fields on microstructural-scale fracture in Al-Al2O3 interpenetrating network composites

Author: Moon, Robert J.; Hoffman, Mark; Rödel, Jurgen; Tochino, Shigemi; Pezzotti, Giuseppe;

Date: 2009

Source: Acta materialia. Vol. 57, no. 2 (Jan. 2009): p. 570-581.

Publication Series: Miscellaneous Publication

Description: The influence of local microstructure on the fracture process at the crack tip in a ceramic–metal composite was assessed by comparing the measured stress at a microstructural level and analogous finite element modelling (FEM). Fluorescence microprobe spectroscopy was used to investigate the influence of near-crack-tip stress fields on the resulting crack propagation at the microstructural scale. The high spatial resolution was effective at mapping the localized crack-tip stress distributions within the complex Al–Al2O3 phase morphologies, where the localized stress distribution about the crack tip within the Al2O3 phase could be measured. Regions of high-localized tensile stress within the microstructure resulting from a combination of applied load and thermal residual stress were identified and could be used in predicting the subsequent crack extension direction. Stress distributions calculated from spectroscopy results were compared with microstructural level FEM of the same structure and general agreement between the two techniques was observed.

Keywords: Composite materials, mechanical properties, testing, ceramic materials, properties, aluminum, microstructure, strains, stresses, aluminum oxide, elasticity, finite element method, microprobe analysis, spectroscopy, fluorescence, loads, Raman spectroscopy, ceramics, fracture mechanics, tensile strength

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Moon, Robert J.; Hoffman, Mark; Rödel, Jörgen; Tochino, Shigemi; Pezzotti, Giuseppe; 2009. Evaluation of crack-tip stress fields on microstructural-scale fracture in Al-Al2O3 interpenetrating network composites. Acta materialia. Vol. 57, no. 2 (Jan. 2009): p. 570-581.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.