Structural Response and Durability of Integrally Stiffened Composite Structures

摘要

Integrally stiffened graphite/epoxy composite structures are evaluated via computational simualtion. A computer code that scales up constituent micromechanics level material properties to the structure level and accounts for all possible failure modes is used for the simulation of composite degradation under loading. Damage initiation, growth, accumulation, and propagation to fracture are included in the simualtion. Design implications with regard to defect and damage tolerance of integrally stiffened composite structures are examined. A procedure is outlined regarding the use of this type of information for setting quality acceptance criteria, design allowables, damage toerance, and retirement-for-cause critieria.