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

Abstract

Load-deflection data from single or double point loaded specimens can be used to determine the fracture stress and Young's 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)

Document Details

Document Type
Technical Report
Publication Date
Feb 15, 1950
Accession Number
AD0633472

Entities

People

  • Alden M. Burghardt
  • Alexander S. Elder

Tags

DTIC Thesaurus Topics

  • Deflection
  • Geometry
  • Mechanical Properties
  • Modulus Of Elasticity
  • Physical Properties
  • Standards
  • Stresses
  • Tensile Stress

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Systems Analysis and Design

Technology Areas

  • Space