Abstract
Fractographic analysis of delayed failure of magnesium fluoride bars at room temperature showed that slow crack growth proceeds intergranularly, whereas rapid crack growth proceeds transgranularly. The size of the semielliptical demarcation between the intergranular and transgranular regions agreed well with the critical size predicted from a fracture mechanics equation. The ratio of the critical flaw size to fracture mirror (mirror‐mist, mist‐hackle, and crack branching) radii was shown to be constant, but the initial flaw size to fracture mirror radii were functions of the time to fracture. The observed time to fracture did not agree with that calculated.
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