CRKGRW - Crack Growth Program User's Manual

摘要

This report is a manual for using CRKGRW Version 2.0 (hereafter called CRKGRW) to calculate crack growth using various models. Relevant background theory is also included. CRKGRW is essentially an upgrading of the FORTRAN 77 program CRKGRW Version 1.0 with program bugs removed and more options added. CRKGRW Version 1.0 is itself a modification of CRACKS IV. This was a FORTRAN IV program written by R.M. Engle Jr of the Air Force Flight Dynamics Laboratory, Wright Patterson Air Force Base. The essence of crack growth programs is to calculate the change in crack length resulting from the application of a single load cycle. This is repeated for each load cycle in the sequence resulting in the total crack length and the time to failure being calculated. Australia. (JES)