Dynamic fracture-toughness evaluation by measurement of CTOD (Crack Tip Opening Displacement). Interim report

Technical Report · Tue Mar 15 04:00:00 EST 1988

OSTI ID:7046624

Sharpe, W N; Douglas, A S; Shapiro, J M

Quantification of the dynamic fracture toughness of structural materials is essential to a wide range of problems - from nuclear accidents to ordnance applications. However, the difficulties associated with accurate measurements of cracks under dynamic loading are considerable. Thus there are no standardized procedures and few reliable results. This work describes a systematic study of the dynamic fracture toughness of SAE-01 tool steel, 4340 and HY100 steels and a tungsten, using the ISDG (Interferometric Strain/Displacement Gage) system which has very-high-frequency resolution. The major advantage of the method is that information is obtained very close to the crack tip, so that stress wave loading effects are accounted for. A detailed error analysis gives an uncertainty of -10% to +20% in the determination of fracture toughness, which compares with + or - 20% for published work.

• Research Organization: Johns Hopkins Univ., Baltimore, MD (USA). Dept. of Mechanical Engineering
• OSTI ID: 7046624
• Report Number(s): AD-A-194836/3/XAB; WNS/ASD-88-02
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103* -- Metals & Alloys-- Mechanical Properties
42 ENGINEERING
420500 -- Engineering-- Materials Testing
ALLOYS
CRACK PROPAGATION
CRACKS
DYNAMIC LOADS
DYNAMICS
ELEMENTS
EQUIPMENT
FRACTURE PROPERTIES
INTERFEROMETRY
IRON ALLOYS
IRON BASE ALLOYS
MEASURING INSTRUMENTS
MEASURING METHODS
MECHANICAL PROPERTIES
MECHANICS
METALS
MILITARY EQUIPMENT
ORDNANCE
STEELS
STRAIN GAGES
TRANSITION ELEMENTS
TUNGSTEN