Accession Number : ADA118968

Title :   A User's Manual for a Detailed Level Fatigue Crack Growth Analysis Computer Code. Volume I. The CRKGRO Program.

Descriptive Note : Final rept. 16 Jan 79-30 Nov 81,

Corporate Author : ROCKWELL INTERNATIONAL EL SEGUNDO CA NORTH AMERICAN AIRCRAFT DIV

Personal Author(s) : Chang,James B ; Szamossi,M ; Liu,Ko-Wei

PDF Url : ADA118968

Report Date : Nov 1981

Pagination or Media Count : 149

Abstract : This report presents the description of a computer program which was developed to perform detailed fatigue crack-growth analysis on a cycle-by-cycle basis. This program is a two-dimensional crack-growth computer routine. An improved load interaction model which accounts for both the retardation and acceleration effects of the spectrum loading was implemented in the program. This program contains a crack library which consists of 10 subroutines, each containing a specific stress intensity factor solution for a specific crack geometry. The program provides the option for counting the cycles for spectrum loadings through the range-pair counting routine built into the program. It also provides the option to perform parametric studies. (Author)

Descriptors :   *Computer programs, *Computer aided instruction, *Crack propagation, *Fatigue(Mechanics), *Airframes, Predictions, Parametric analysis, Cyclic tests, Overload, Retardation, Spectrum analysis, Loads(Forces), Structural properties, Coding, User manuals

Subject Categories : Aircraft
      Computer Programming and Software
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE