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Prediction of the creep behaviour of metallic materials under step loading using a simple mechanical model
Author(s) -
Pantelakis Spiros G.,
Batsoulas Nikolaos D.,
Kermanidis Theodor B.
Publication year - 1991
Publication title -
steel research
Language(s) - English
Resource type - Journals
eISSN - 1869-344X
pISSN - 0177-4832
DOI - 10.1002/srin.199101292
Subject(s) - creep , materials science , austenite , simple (philosophy) , stress (linguistics) , structural engineering , metal , mechanics , composite material , metallurgy , microstructure , engineering , physics , philosophy , linguistics , epistemology
The creep exposure of metallic parts usually occurs under time‐variable loading conditions. For the prediction of creep behaviour under step loading a simple mechanical model is employed. The model is based on the time dependence of the material structure during creep. Therefore, the characteristic parameters of the model are considered to be functions of time and are correlated with the time dependence of the material structure parameters. For the definition of these functions a structure mechanical model has been employed. The mean internal material resistance has been considered as an appropriate structure parameter. The characteristic parameters of the model are defined in each step loading on the basis of the change of the internal stress derivative. For the verification of the model prediction the numerical results are compared with experimental results of the austenitic steel X 8 CrNiMoNb 16 16 for the orthogonal cyclic stress function.