TPBTTest Program Builder Tool (Universal Ada Test Language)
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Equations (15) and (16) can be used in calculation of unstable fracture toughness, [K.sup.un.sub.I] at the tip of effective crack length [a.sub.c], in which a = [a.sub.c] and P = maximum load, [P.sub.u] for TPBT and CT test specimen geometries, respectively.
Some characteristics of [K.sub.R]-curve were investigated numerically on standard TPBT specimen for different concrete strength and specimen sizes [6].