Hot tensile and creep rupture data extrapolation on 2.25Cr-1Mo steel using the CDM Penny-Kachanov methodology

Abstract

Hot tensile and creep data were obtained for 2.25Cr-1Mo steel, ASTM A387 Gr.22CL2, at the temperatures of 500-550-600-650-700 °C. Using the concept of equivalence between hot tensile data and creep data, the results were analyzed according to the methodology based on Kachanov Continuum Damage Mechanics proposed by Penny, which suggests the possibility of using short time creep data obtained in laboratory for extrapolation to long operating times corresponding to tens of thousands hours. The hot tensile data (converted to creep) define in a better way the region where β=0 and the creep data define the region where β=1, according to the methodology. Extrapolation to 10,000 h and 100,000 h is performed and the results compared with results obtained by other extrapolation procedures such as the Larson-Miller and Manson-Haferd methodologies. Extrapolation from ASTM and NIMS Datasheets for 10,000 h and 100,000 h as well as data from other authors on 2.25Cr-1Mo steel are used for assessing the reliability of the results.

On the Use of Special Functions for Analyzing the Steady State Creep in Short Fiber Composites Semi-theoretically

“…To analyze the steady state creep problem, a cylindrical unit cell model is assumed in accordance with previous researches in order for modeling a short fiber composite 1,2,[7][8][9][10][11] . Therefore, a unit cell of the short fiber composite is a representative for a complete composite.…”

“…In the recent years, the analytical methods have been introduced for analyzing nonlinear differential and ordinary equations with purpose of obtaining suitable solutions and algorithms. In addition, some analytical and experimental attempts were carried out to analyze the creep behaviors [7][8][9][10][11][12] .…”