PROBABILITY BASED FRACTURE MECHANICS FOR IMPACT PENETRATION DAMAGE

This paper presents a new method for assessing the residual strength of structural components which have sustained impact penetration damage. The method is based upon the application of the Weibull probability density function to account for the significant scatter in residual strengths which result from the random nature of impact damage detail (cracks, holes, and spall surfaces). To measure the extent of an impact damage pattern, a new parameter is presented which is based upon the solution for a inclined crack in a uniaxial tension field and an experimentally obtained fracture criterion for mixed mode crack configurations. Test results are presented for residual strengths of machined damage specimens to ascertain the statistical nature which arises from extreme damage detail, smooth holes and sharp cracks. Finally, probability of failure curves are given for both machined (7075-T6) and impact damage (7075-T6 and 2024-T81) in aluminum uniaxial tension panels.

  • Supplemental Notes:
    • Published in International Journal of Fracture, Vol. 13, No. 4, August 1977, pp. 409-430.
  • Corporate Authors:

    Army Materials and Mechanics Research Center

    Mechanics and Materials Division
    Watertown, MA  USA  02172
  • Authors:
    • Rich, T P
    • Tracy, P G
    • Tramontozzi, L R
    • Adachi, J
    • Benicek, M
    • Katz, A H
    • Foster, W J
  • Publication Date: 1978-6

Media Info

  • Features: References;
  • Pagination: 24 p.

Subject/Index Terms

Filing Info

  • Accession Number: 00184799
  • Record Type: Publication
  • Source Agency: Army Materials and Mechanics Research Center
  • Report/Paper Numbers: AMMRC TR 78-24
  • Files: TRIS
  • Created Date: Jan 13 1979 12:00AM