ETM format for creep deformation parameters

Parameters for the correlation of creep deformation and crack extension behavior are developed from principles that assume the commonality of all deformation forms. An assumption is made that the relationship between the force, crack length and deformation parameters has a separated format that is common for of all types of deformation. This allows the use of parameter forms developed for elasticity and plasticity to be extended to the characterization of creep deformation. Equation forms are developed based on the parameters C*, C_t and on the #delta#_5 formats. These equation forms are needed to complete a procedure for predicting residual life in structural components with crack-like defects that operate in the high temperature creep deformation regime. The formats proposed for some of these parameters were subjected to experimental evaluation. The evaluation was conducted with a Mg alloy, AZ31, which exhibited creep behavior at 150 C. Both smooth tensile specimens and notched and precracked fracture mechanics specimens were tested. The results showed that the separation form of the equation appears to be experimentally validated. / SIGLE / Available from TIB Hannover: RA 3251(04/5) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische Informationsbibliothek / DE / Germany