Method for Tensile Testing of Brittle Materials

Abstract

A method of tensile testing is described in which hydrostatic pressure, acting radially against the internal wall of a cylindrical specimen, is utilized to create a uniform tangential tensile stress in the specimen wall. The method is applicable to brittle materials because it eliminates nonaxial stresses due to misalignment and localized stress concentrations which normally arise from gripping or supporting the test specimens. Standard deviations of 1.1 to 2.6% were obtained on plastic and aluminum oxide specimens. The method and apparatus are described, and the results are presented.

In vivo and in vitro changes in strength of orthopedic calcium aluminates

“…However, comparatively little has been done along this line with polycrystalline ceramics. Alumina exhibits a significant loss of strength with time in a moist air environment when subjected to static or cyclic applied stresses much in excess of certain threshold values; viz., 18,000 psi in the first case and 16,000 psi in the second (18). Moreover, it loses strength even when aged without applied stress in vitro in a saline solution or in vivo in the soft tissues of either mongrel dogs or rabbits (unpublished observations: S. D. Brown and G. H. Kenner).…”

The mechanical strength of a ceramic porous hollow fiber

“…De With does not recommend the use of this test, but proposed the use of a modified burst pressure [51][52][53]. The use of a burst pressure method is considered to be beyond the scope of this paper.…”

The Mechanics of Ballistic Impact - A Survey

“…No rate dependence was noted from measurements with foil type strain gages up to strain rates of 100 in/in/sec. Sedlacek (238) has determined the tensile strength of alumina using hydraulically expanded cylindrical test specimens, and although a ratedependence has been reported, the results are scattered and highly uncertain.…”