FRACTURE OF BRITTLE MATERIALS UNDER TRANSIENT MECHANICAL AND THERMAL LOADING
Technical rept. for Apr 1965-Nov 1966
IIT RESEARCH INST CHICAGO IL
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The integrity of brittle elements subjected to time-dependent thermal and mechanical loads was predicted by means of an algorithm involving three steps the determination of the temperature distribution, the determination of the thermal and mechanical stresses, and the statistical description of the resistance of the brittle material. Experiments were conducted on beams and disks under transient thermal and mechanical loads. The fracture probability- time curves obtained for these members are very accurately predicted by the fracture algorithm. The sensitivity of the beam and disk response to changes in the elastic, thermal, and statistical strength parameters was investigated. A combined stress fracture theory for brittle elements was developed which accounts for a history of thermal and mechanical loading.