Accession Number : AD0717150


Title :   Cracks, A FORTRAN IV Digital Computer Program for Crack Propagation Analysis


Descriptive Note : Final technical rept. Jul 1969-Mar 1970


Corporate Author : AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OH


Personal Author(s) : Engle, Jr, Robert M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/717150.pdf


Report Date : Oct 1970


Pagination or Media Count : 61


Abstract : The report presents a detailed description of a computer program for analyzing crack propagation in cyclic loaded structures. The program has the option of using relationships derived by Forman or by Paris for crack growth. Provisions are made for both surface flaws and through cracks as well as the transition from the former to the latter. The program utilizes a block loading concept wherein the load is applied for a given number of cycles rather than applied from one cycle number to another cycle number. Additional features of the program are: variable print interval, variable integration interval, and optional formats for loads input. Detailed input instructions and an illustrative problem are presented.


Descriptors :   *CRACK PROPAGATION , *AIRFRAMES , IMPACT TESTS , LOADS(FORCES) , FRACTURE(MECHANICS) , FORTRAN , COMPUTER PROGRAMS , STRESSES , NUMERICAL ANALYSIS


Subject Categories : Aircraft
      Computer Programming and Software
      Mechanics


Distribution Statement : APPROVED FOR PUBLIC RELEASE