Accession Number : AD0624168

Title :   TRANSIENT ANALYSIS IN A FRACTURING EPOXY PLATE WITH A CENTRAL CRACK.

Descriptive Note : Interim technical rept.,

Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Kobayashi,A. S. ; Bradley,W. B. ; Selby,R. A.

Report Date : 15 AUG 1965

Pagination or Media Count : 35

Abstract : Transient displacement distributions in fracturing epoxy plates were determined experimentally in centrally notched epoxy plates of approximately 16' x 4' x 0.2' in size. The Moire fringe method in conjunction with a microflash unit was used to photographically record the transient displacement fields in the fracturing plates. Transient Moire fringe patterns were either scanned by a microdensitometer for accurate determination of the locations of fractional fringes or Westergaard's stress functions were fitted to data points obtained by direct measurements. In most cases, the displacement distributions in the vicinity of the running crack tips varied as the square root of r. The dynamic stress intensity factors for cases considered were approximately 2.3 to 5.5 times the static fracture toughness of the material. Distribution of normal strains in the longitudinal direction, of principal strains, and of maximum shear strains were determined for various crack tip locations in the plates. These results showed qualitative agreement between available theoretical and experimental results for comparable solutions. (Author)

Descriptors :   (*EPOXY RESINS, FRACTURE(MECHANICS)), (*FRACTURE(MECHANICS), EPOXY RESINS), STRESSES, OPTICAL ANALYSIS, STRAIN(MECHANICS)

Subject Categories : Plastics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE