Accession Number:

ADA000681

Title:

K Results and Comparisons for a Proposed Standard C-Specimen

Descriptive Note:

Technical rept.

Corporate Author:

WATERVLIET ARSENAL NY

Personal Author(s):

• Underwood, J. H.
• Kendall, D. P.

Report Date:

1974-09-01

Pagination or Media Count:

28.0

Abstract:

Stress intensity factor data from a boundary value collocation method are used to determine the K calibration for a proposed standard C-shaped specimen for fracture toughness testing. The standard specimen can be readily used with hollow cylinders which have outer-to-inner diameter ratios between 1.2 and 3.0. The K calibration is described in a polynomial form similar to that used with the ASTM standard compact specimen but with an additional term dependent on diameter ratio. Stress intensity factor results from a standard C- specimen with shallow cracks are compared with an analysis based upon the elastic solution for a curved beam under remote bending. K results for mid- depth cracks in the standard C-specimen are compared with compact specimen results and with results from a recently proposed round specimen similar to the compact specimen. Some suggestions are given and anticipated problems are discussed related to testing with the proposed standard specimen.

Descriptors:

• *CYLINDRICAL BODIES
• *STANDARDS
• *TEST METHODS
• CALIBRATION
• CRACK PROPAGATION
• FRACTURE(MECHANICS)
• GEOMETRIC FORMS
• METALS

Subject Categories:

• Metallurgy and Metallography
• Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE