ISSN: 0090-3973
Page Count: 14

A Computer Program to Aid in Fatigue Precracking of Fracture Toughness Test Specimens

Sriharsha, HK
Bhabha Atomic Research Centre,

Anantharaman, S
Bhabha Atomic Research Centre,

Chatterjee, S
Bhabha Atomic Research Centre,

Pandey, RK
Professor,Indian Institute of Technology,

(Received 6 January 1997; accepted 2 March 1998)

Abstract

Fatigue precracking prior to fracture toughness and fatigue tests ensures a sharp crack ahead of the notch tip. The precracking procedure is outlined in ASTM Standards E 399-78a (Standard Test Method for Plane-Strain Fracture Toughness of Metallic Materials). E813-89 (Standard Test Method for J^IC, A Measure of Fracture Toughness), and E-1152-87 (Standard Test Method for Determining J-R Curves). This paper describes an interactive computer program that accepts material properties and specimen dimensions as program input. The program output when plotted graphically suggests an easy and practical precracking procedure adhering to the standards mentioned above. The program is useful in the absence of a computer-controlled testing facility. The program listout is given in the Appendix.

Keywords:
fatigue precracking, stress intensity factor, stress intensity factor range, maximum load, load stepdown, limit load criterion, three-point bend test specimen, compact tension test specimen

Paper ID: JTE12033J
DOI: 10.1520/JTE12033J
ASTM International is a member of CrossRef.