2019/12/03 by Harmathy, T. Z.
#Fire #Incendie #building materials #champ de température #charge d'incendie #construction métallique #creep #déformation #equations (maths) #fire loads #fluage #matériau de construction #metal construction #strain #temperature range #équation (mathématique)
paper · doi:10.4224/40001531
Based on Dorn's creep theory, a comprehensive creep model has been developed that is applicable to the calculation of deformation processes at steadily increasing temperatures and slowly varying load. It is shown that the entire course of the creep curve (excepting the tertiary creep) of structural (polycrystalline) materials is uniquely determined by two stress-dependent parameters epsilon[t0] and Z. Explicit expressions for the description of creep processes are proposed. These expressions cannot strictly be regarded as equations of state, but yield an accuracy acceptable for engineering calculations even if dsigma/dt does not equal 0.