Remaining Creep or Stress-Rupture Life Under Nonsteady Temperature and Stress

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Abstract
This paper presents a historical review of the assessment of remaining creep life for components operating under stress at elevated temperatures. Topics considered in this review include the effects of multiaxial stress state on creep deformation and rupture, empirical methods of summing creep damage, empirical methods of evaluating elevated temperature strength, testing of service exposed material, and microstructural observations of creep damage. While considerable understanding of the damage process has been gained in laboratory testing, only limited success has been attained in quantifying damage of service exposed materials designed to operate in the long time and low stress regime permitted by industrial codes.

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