Accession Number:

AD0266345

Title:

COMBINED STRESSES IN AN ORTHOTROPIC PLATE HAVING A FINITE CRACK

Descriptive Note:

Corporate Author:

CALIFORNIA INST OF TECH PASADENA GRADUATE AERONAUTICAL LABS

Personal Author(s):

Report Date:

1961-07-01

Pagination or Media Count:

1.0

Abstract:

By using a formulation in integral equations, a solution for the combined extension-classical ben ing stress an displacement olution is presented for the case of an infinite orthotropic flat plate containing a finite crack. Primary emphasis is placed upon the stress s near the crack point. Qualitatively no major difference in behavior due to orthotropy was found, certain quantitative features are noted, mainly as a function of the characteristic rigidity ratio E sub xE sub y to the 12 power. The inverse square root character of the isotropic stress bending and extension is not changed by orthotropy, although amplitudes and distribution are affected. Account is taken of recen work of Knowles and Wang GALCIT SM 60-11, July 1960 dealing with Reissner bending of the plate in deriving a bending-extension interaction curve for fracture initiation. The interaction is linear if an octahedral shearing stress criterion is used. Author

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Distribution Statement:

APPROVED FOR PUBLIC RELEASE