Investigations of the subcritical crack growth phenomenon and the estimation of lifetime of alumina and alumina-zirconia composites with different phase arrangements

摘要

The Constant Stress Rate Test was used to determine subcritical crack propagation of sintered composites in the alpha-alumina-tetragonal zirconia system. Strength measurements were conducted at different stress rates. Material strength depends on the flaw size. Increasing stress rates led to strength increase as a result of shortening of the time of crack growth.