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The procedures for calculating estimates of the remaining life of key engineering components and the material properties used in those procedures are usually computerized. This paper reviews the properties that are typically needed for remaining life calculations and discusses how they should be computerized to properly interface with analytical methods. The properties include stress-strain and creep deformation behavior, fatigue and creep damage accumulation, tensile strength, crack-growth resistance, and fracture toughness. for remaining life calculations, computerized models of these properties should include the effect of aging caused by elevated-temperature service exposure. Typical methods for computerized modeling of material properties are illustrated by means of two specific examples: (1) the prediction of remaining creep-rupture life of fired furnace tubes and (2) the prediction of remaining creep-rupture and creep-crack-growth life of welded pipes and pressure vessels.
material properties, remaining life assessment, creep (materials), crack growth, fracture toughness, material damage, modeling, material aging, computerized material property databases, computers, data systems, materials databases
Senior group leader, Cortest Columbus Technologies, Inc., Columbus, OH