SYMPOSIA PAPER Published: 01 January 1970

Application of Fracture Mechanics Technology to Medium-Strength Steels


A review of fracture toughness and fatigue crack growth rate data currently available for medium-strength steels is presented. Data are included for three commonly used structural steels (AISI 1045, 1144, and 4140); two pressure vessel steels (ASTM A533 Grade B, Class 1 and A216 WCC grade); and three grades of rotor forging steels (ASTM A469, Class 4; A470, Class 8; and A471, Class 4). These data clearly illustrate that under conditions of sufficient restraint to ensure plane strain loading, existing linear elastic fracture mechanics technology is applicable to medium-strength steels. The advantages and overall potential of fracture mechanics technology as a quantitative tool for the prevention of failure is demonstrated by means of an example problem.

Author Information

Clark, WG
ASTM, Pittsburgh, Pa.
Wessel, ET
ASTM, Pittsburgh, Pa.
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Developed by Committee: E08
Pages: 160–187
DOI: 10.1520/STP33666S
ISBN-EB: 978-0-8031-4585-6
ISBN-13: 978-0-8031-0037-4