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##### Volume 4, Issue 5 (September 1976)

### A Damage Function and Associated Failure Equations for Predicting Hold Time and Frequency Effects in Elevated Temperature, Low Cycle Fatigue

**CODEN:** JTEOAD

**Abstract**

A new approach is developed for predicting strain-controlled, low cycle fatigue life at elevated temperature using a proposed energy measure of fatigue damage. This measure of damage, defined as the net tensile hysteretic energy of the fatigue cycle, can be approximated by the damage function σ_{T}Δε_{p}, where σ_{T} is the maximum stress in the cycle and Δε_{p} is the inelastic strain range. The damage function is applied to predicting effects of hold time and frequency, when time-dependent damage occurs, through failure relations incorporating a variation of Coffin's frequency modified approach. Failure equations are developed for two postulated categories of time-dependent damage.

**Author Information:**

Ostergren, WJ

*Manager, Mechanics of Materials, Gas Turbine Products Division, General Electric Co., Schenectady, N. Y.*

**Stock #:** JTE10520J

**ISSN:** 0090-3973

**DOI:** 10.1520/JTE10520J

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Title A Damage Function and Associated Failure Equations for Predicting Hold Time and Frequency Effects in Elevated Temperature, Low Cycle Fatigue

Symposium , 0000-00-00

Committee E08