Fiber orientation in composite structures for optimal resistance to creep failure

The objective of this research is to provide an approximate but reliable method of assessing various fiber configurations in a metallic composite structure with the intent of achieving optimal resistance to creep failure. The approximate method, envisioned as an early design tool, is based on an upper bound on the creep rupture time and an associated representative failure stress. The latter is evaluated and compared for different fiber configurations, thereby identifying the configuration with optimal creep rupture resistance. A substantial saving in computational time is realized by avoiding a detailed analysis of the actual failure process. Application is made to reinforced thin- and thick-walled cylindrical vessels under interior pressure.