Dependence of local fracture stress on temperature

Abstract

The local fracture stress, such as σ_F in the Knott model or σ_u in the Beremin model, has been thought to be independent of temperature, which has been explained by the Griffith equation with constant surface energy γ_eff.
An application of the mod:f:ed Beremin model gives a more plausible method to correlate the local fracture stress with γ_eff. It is shown that γ_eff increases with raise in temperature.