Prediction of creep residual life of aluminum alloy 2A12 by using indentation test method with flat cylindrical indenters

A method of predicting the residual creep life of aluminum alloy 2A12 by using indentation test method with flat cylindrical indenters was proposed. There were four steps included in the method. First, specimens with different creep damage levels were obtained by the tensile creep testing (by control testing time). Second, the above damage specimens were put to the indentation testing, and then the typical load-displacement curves were yielded. Third, correlation equations were used to get pre-damage values. In the end, the residual creep life can be determined by the relationship between the slope of the initial portion of the unloading curve and the damage values.