An Experimental Study on the Compressive Biaxial Strength of Ceramics
Abstract
A mechanical testing program in which the biaxial compressive strength of WESGO AL-995, high strength alumina was measured has shown that the biaxial compressive strength of such material is only slightly affected by the value of the intermediate principal compressive stress. The average value of the compressive strengths measured in all stress states, excluding the equi-biaxial compression stress state, was 528 ksi. The standard deviation of the individual measured strengths was only a few percent of the average values, which is consistent with the predictions of flaw statistics theories. The tensile strengths measured for the material indicate the ratio of compressive strength to tensile strength is approximately 18. It is suggested that the compressive strength of a material is limited by the amount of crack damage which may be sustained in the material without structural collapse occurring. The general aspects of compressive failure are presented which include a description of the micromechanical mechanisms of crack initiation and extension that can operate in a body subjected to purely compressive loading. Three types of flaws are identified which can initiate cracks. The problem of describing crack initiation and extension in three dimensions is addressed. The results of experimental studies of crack extension from three-dimensional, penny-shaped flaws introduced into blocks of polymethylmethacrylate plastic are presented.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 01, 1975
- Accession Number
- ADA016615
Entities
People
- George Sines
- Marc Adams
Organizations
- University of California, Los Angeles