Abstract
High-performance, lightweight jet engines, which are designed for relatively low cost production and long life requirements, place stringent restrictions on material utilization. Static structure design criteria require that tensile, creep, and cyclic life limits be met. However, the long operational lifetimes require increased accuracy and reliability of material data and analysis methods. In addition, the widespread use of welded sheet fabricated structures has emphasized the need for quality control of manufacturing processes and for a viable defect-tolerance approach to cyclic life prediction. A design method which is based on the fracture mechanics approach is presented. Both material and geometric imperfections are considered, and guidelines are presented to achieve safe lifetimes for lightweight welded structures.
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