Behavior of surface and corner cracks subjected to tensile and bending loads in Ti-6Al-4V alloy

Technical Report · Sat Sep 01 04:00:00 EDT 1990

OSTI ID:5555321

Forman, R G; Mettu, S R

The behavior of part-through flaws with regard to failure under monotonic loading and their growth under fatigue loading was studied experimentally and analytically. Comparisons are made of experimental values of toughness obtained using surface and corner cracked specimens with those obtained using standard test specimens, and also experimental growth cycles were compared with numerical predictions using the NASA/FLAGRO computer program. Tests were conducted on various types of surface and corner cracks under tensile and bending loads. Room temperature lab air provided the test environment. The material used in this study was the Ti-6Al-4V alloy in the solution treated and aged (STA) and stress relieved condition. Detailed tabulation of the fracture toughness data and results of life prediction using the NASA/FLAGRO program are presented. Fatigue crack growth rates for the part-through cracked specimens are compared with a base curve fitted from the data obtained using standard specimens. The fatigue loading used in the crack growth testing was constant-amplitude sinusoidal type.

• Research Organization: National Aeronautics and Space Administration, Houston, TX (USA). Lyndon B. Johnson Space Center
• OSTI ID: 5555321
• Report Number(s): N-91-19273; NASA-TM--102165; S--611; NAS--1.15:102165
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
ALLOYS
ALUMINIUM ALLOYS
COMPUTER CODES
CRACK PROPAGATION
FATIGUE
FRACTURE PROPERTIES
MECHANICAL PROPERTIES
SERVICE LIFE
TITANIUM ALLOYS
TITANIUM BASE ALLOYS
VANADIUM ALLOYS