History-sensitive accumulation rules for life-time prediction under variable creep loading

摘要

A general form of temporal strength conditions under variable creep loading is employed to formulate several new phenomenological accumulation rules based on the constant-loading durability diagram. Unlike the well-known Robinson rule of linear accumulation of partial life-times, the new rules allow to describe the life-time sensitivity to the load sequence observed in experiments. Comparison of the new rules with experimental data shows that they fit the data much more accurately than the Robinson rule.