Master Curve for Creep Strength

A prediction method for the creep strength, (t, from the master curve of the CSR strength using the linear cumulative damage law was presented in our previous publication. Let tfa) and tfa) be the CSR and creep failure time, respectively, for the stress a. Suppose that the material experiences a non-decreasing stress history a(t) for 0 f / where t is the failure time under this stress history. The linear cumulative damage law states 

When a(f) is a constant stress 7o, the above formula yields r = tf ty.  

---