# Understanding Creep and Creep Rate

by jaredogden
Tags: creep, rate
 Admin P: 21,911 In the elastic range, σ = Eε, where E is the elastic (Young's) modulus, i.e., it's linear as in 'linear elastic'. In most systems, the service domain is in the elastic range. Secondary or steady-state creep involves inelastic or plastic deformation in which, σ = Kεn, or ln σ = ln K + n ln ε. and there is also cases where, σ = K εn $\dot{\epsilon}^m$. In the case of ln(dεss/dt) vs ln(σ), this implies a strain rate effect, i.e., strain hardening or strain rate (hardening) effect, e.g., σ = K $\dot{\epsilon}^m$.