Accession Number : ADA194836

Title :   Dynamic Fracture Toughness Evaluation by Measurement of CTOD (Crack Tip Opening Displacement).

Descriptive Note : Interim rept.,

Corporate Author : JOHNS HOPKINS UNIV BALTIMORE MD DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Sharpe, William N , Jr ; Douglas, Andrew S ; Shapiro, Jason M

PDF Url : ADA194836

Report Date : 15 Mar 1988

Pagination or Media Count : 88

Abstract : 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.

Descriptors :   *FRACTURE(MECHANICS), *TOUGHNESS, *TUNGSTEN, *CRACK PROPAGATION, *STEEL, ACCIDENTS, CONSTRUCTION MATERIALS, CRACKS, DETERMINATION, DISPLACEMENT, DYNAMIC LOADS, DYNAMICS, ERROR ANALYSIS, HIGH RESOLUTION, INTERFEROMETRY, NUCLEAR RADIATION, OPENING(PROCESS), ORDNANCE, RELIABILITY, STANDARDIZATION, STRAIN GAGES, STRESS WAVES, TEST AND EVALUATION, VERY HIGH FREQUENCY, STRUCTURAL STEEL, TOOL STEEL

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE