| In this dissertation, the microscopic and macroscopic mechanical behaviors of structure ceramics under stress induced martensitic transformation are investigated theoretically and experimentally. Based on micromechanics, thermodynamics and microscale t→m transformation mechanism considerations, a microscopic constitutive theory is proposed to describe the plastic, pseudoelastic and shape memory behaviors of the structure ceramics during transformation. For proportional and non-proportional loading histories, macroscopic constitutive relations containing micro-structural variables are derived respectively. Finally, the toughening analyses of mode 1 and mode III cracks in stationary and steadily growing state are given for PSZ and TZP ceramics using the derived constitutive law.
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