Accession Number:

AD0767614

Title:

Development and Evaluation of Methods of Plane Stress Fracture Analysis. Part 1. Review and Evaluation of Structural Residual Strength Prediction Techniques

Descriptive Note:

Final rept. Jul 1972-Feb 1973

Corporate Author:

NORTHROP CORP HAWTHORNE CA AIRCRAFT DIV

Personal Author(s):

Report Date:

1973-05-01

Pagination or Media Count:

113.0

Abstract:

The treatment of residual strength prediction for aircraft structures having through flaws is considered in this report. A discussion of the circumstances which normally give rise to plane stress or mixed mode fracture is presented along with a summary of those elements which would constitute an ideal residual strength method.. This method would be capable of prescribing the remaining strength possessed by a broad variety of flawed aircraft structures under actual service environments. Currently available prediction techniques fall considerably short of the desired goal, and the strong and weak points of existing methods, as well as comparisons with test results, are presented. A recommended technique is described for residual strength prediction which bridges the gap between the existing methods and the ideal. The recommended approach will account for slow crack growth and plasticity. It appears that the approach will utilize the J integral in combination with a modified form of the crack growth resistance curve in making residual strength predictions.

Subject Categories:

  • Aircraft
  • Metallurgy and Metallography

Distribution Statement:

APPROVED FOR PUBLIC RELEASE