An examination of creep failure criterion based on a strain threshold identified with a power law model

The debate on whether the creep failure is induced by a stress threshold or a strain threshold is studied on several soils in this paper with a power law model and a normalization curve. The analysis indicates: (a) the creep failure is based on a critical strain, which is obtained with a normalization curve; (b) the time to the creep failure is very long for a low stress level or a low creep exponent; (c) for a given time to the creep failure, the strain threshold could be converted to a stress threshold, and variable stress thresholds will be calculated for different times given to the creep failure; (d) the creep behavior of various materials could be compared with the normalization curve and the power law model.

Automated summary

This paper studied the debate on whether creep failure is induced by a stress threshold or a strain threshold using a power law model and a normalization curve. The analysis showed that creep failure is based on a critical strain, the time to creep failure is influenced by stress level and creep exponent, and stress thresholds can be converted from strain thresholds for different times given to the creep failure. Creep behavior of various materials can be compared using the normalization curve and power law model.