Accession Number : ADP001026

Title :   A Functional Stress Intensity Approach to Multiply Cracked, Partially Autofrettaged Cylinders.

Descriptive Note : Final rept.,

Corporate Author : ARMY ARMAMENT RESEARCH AND DEVELOPMENT COMMAND WATERVLIET NY LARGE CALIBER WEAPON SYSTEMS LAB

Personal Author(s) : Pu,San-Li

Report Date : JUN 1983

Pagination or Media Count : 22

Abstract : The functional stress intensity approach for a partially autofrettaged, thick-walled cylinder is presented. This approach is a combination of a series of methods developed for the computation of stress intensity factors for multiple radial cracks emanating from the inner or the outer surface of a hollow cylinder. The numerical method is mainly based on the finite element method using 12-node quadrilateral, isoparametric elements with singular elements around a crack tip. The difficulty due to the presence of initial stresses in the finite element method is obviated by the method of thermal simulation which replaces the residual stresses existed in an autofrettaged cylinder by an active thermal load. The weight function method is incorporated to reduce the repeated computations of stress intensity factors of the same geometrical configuration subjected to various external loads and residual stresses. The functional stress intensity factor is introduced to overcome the difficulty in seeking the weight function itself. (Author)

Descriptors :   *Stress analysis, *Numerical methods and procedures, *Cracks, Autofrettage, Finite element analysis, Thick walls, Cylindrical bodies, Computations, Computer applications, Weighting functions, Formulas(Mathematics), Modification

Distribution Statement : APPROVED FOR PUBLIC RELEASE