Accession Number:

AD0633472

Title:

MECHANICAL TESTS. DEVELOPMENT OF A STANDARD BEND TEST FOR CEMENTED CARBIDES,

Descriptive Note:

Corporate Author:

WATERTOWN ARSENAL LABS MASS

Report Date:

1950-02-15

Pagination or Media Count:

28.0

Abstract:

Load-deflection data from single or double point loaded specimens can be used to determine the fracture stress and Youngs modulus of cemented carbides provided the proper geometry of specimen and fixture dimensions are selected and elastic behavior is maintained. The fracture stress of standard double point loaded specimens that plastically deform prior to fracture may be computed by a method outlined by Nadai. A double point loading procedure subjects a considerable area of the specimen to the maximum tensile stress and thereby provides a better indication of metal quality with respect to flaws and a more sensitive means of detecting plastic yielding than a single point loading method. A bar 0.300 in. wide, 0.150 in. thick, and 2.0 in long has been found to be satisfactory as a standard cemented carbide bend specimen when it is supported over a span of 1.5 in. and double point loads are applied by two pins spaced 0.50 in. apart. The two loads applied by the double point loading fixture are of equal magnitude and one is located 0.5 in. from each support. Author

Subject Categories:

  • Ceramics, Refractories and Glass
  • Laminates and Composite Materials
  • Test Facilities, Equipment and Methods

Distribution Statement:

APPROVED FOR PUBLIC RELEASE