Models of Long-Term Brittle Fracture of Rods in Tension and Compression Under Creep Conditions

Fracture models based on the increasing density of material and the decreasing bearing mass of material in tension and compression, respectively, are proposed. The creep strain rates modeled using the most widespread version of the flow theory. An analytical approach allows obtaining an equation identical in all cases and relating Poisson’s ratio, time function, and rheological parameter. An algorithm for determining two last parameters based on creep testing is proposed. The expected time-to-fracture values of heat-resistant alloys are in good qualitative and quantitative agreement with the experimental data. © 2017, Springer Science+Business Media, LLC.