The maximum error of the inverse fitting of Tada et al.’s equation of the a/W–crack mouth opening displacement (CMOD) compliance equation proposed by Joyce and adopted in ASTM E1820-11 for single edge bend [SE(B)] specimens with shallow cracks (0.05 ≤ a/W < 0.45) is observed to be 2.03 % for 0.05 < a/W < 0.1. A new a/W–CMOD compliance equation with the same fifth-order polynomial fitting applicable for SE(B) specimens with 0.05 ≤ a/W ≤ 0.7 is therefore proposed. The maximum fitting error of the proposed equation is approximately 0.19 %.
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