Accession Number : AD0769238

Title :   Photoelastic Investigation on the Crack-Arrest Capability of Pretensioned Stiffened Panels.

Descriptive Note : Technical rept.,

Corporate Author : WASHINGTON UNIV SEATTLE DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Wade,B. G. ; Kobayashi,A. S.

Report Date : OCT 1973

Pagination or Media Count : 35

Abstract : Dynamic photoelasticity, employing a 16-spark gap Cranz-Schardin camera system, was used for dynamic analysis of propagating cracks in stiffened panels. The method of finite elements was used for a corresponding static models included 3/8 x 10 x 10-inch Homalite-100 plates with 10- and 25-percent pin-joined and bonded stringers. Static and dynamic strain energy release rates, kinetic energy release rates and stringer load concentration factors were determined in stiffened panels that were pretensioned and then impacted by a projectile. It was found that the arrest capability of a stiffened panel could be assessed through the kinetic energy release rate concept. Also bonded stiffeners were found to be more effective in arresting a propagating crack than a corresponding pin-joined stiffened panel. (Author)

Descriptors :   (*Panels, *Crack propagation), Fracture(Mechanics), Numerical analysis, Stiffening, Photoelasticity

Subject Categories : Construction Equipment, Materials & Supplies

Distribution Statement : APPROVED FOR PUBLIC RELEASE