Abstract
Calculation of stress intensity factors (K) for the three-point bend specimen by the FEM was investigated. The accuracy and reliability of K calibrations from FEM for the ratio of support span to specimen width, S/W=8, agrees with the literature.
Stress intensity factor, KI for the three-point bending, single edge cracked beam specimen is
KI=σ√a(1.73-0.76α2+1.78α2-0.31α3+10.15α4)
for 0≤a=a/W≤0.7, where σ=stress, W=specimen width, α=crack length and S=support span (=2.5 W).
