Tensile Testing of Ceramics and Ceramic-Matrix Composites
Abstract This chapter describes the advanced ceramic materials that include both noncomposite, or monolithic, ceramics (for example, oxides, carbides, nitrides, and borides) and ceramic-matrix composites (CMCs). It describes the rationale for use of ceramics and intrinsic limitations of ceramics. The chapter presents four key considerations that must be taken into account when carrying out tensile tests on advanced monolithic ceramics and CMCs. These include effects of flaw type and location on tensile tests, separation of flaw populations, design strength and scale effects, and lifetime predictions and environmental effects. The chapter discusses the advantages, problems, and complications of four basic categories of tensile testing techniques as applied to ceramics and CMCs. These categories are true direct uniaxial tensile tests at ambient temperatures, indirect tensile tests, tests where failure is presumed to result from tensile stresses, and high-temperature tensile tests.