Towards the Standardization of Time-Temperature Parameter Usage in Elevated Temperature Data Analysis

Abstract

A Task Group of the Joint Committee on Effect of Temperature on the Properties of Metals (sponsored by the American Society for Testing and Materials, the American Society of Mechanical Engineers, and the Metal Properties Council) did an extensive study of methods for the extrapolation of short-time rupture data in an effort to decide if any one method might serve as a basis for a standard practice. Emphasis was on the time-temperature parameter. The following conclusions were reached: 1. Among the computerized techniques the newly introduced minimum-commitment method (MCM) is on the average about as good as the best of the four standard time-temperature parameters studied. 2. In addition, the MCM has other potential merits which make it a candidate for the sought-after standard. Further study and investigative work are required to realize this potential. 3. Experienced analysts can get good results by manual extrapolation methods. These methods are subjective, and because of the limited availability of experienced analysts such methods probably should not be considered for standard practice. Many recommendations are given in the report for future work toward the goal of defining a standard practice.