Plane strain fracturetoughness (KIc). The critical value of the stress intensity factor (i. e., at which crack propagation occurs) for the condition of plane strain.
平面应变断裂韧性(KIc)：平面应变条件下应力强度因子的临界值(即达到该值时裂纹发生扩展)。
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Fracturetoughness (Kc). Critical value of the stress intensity factor for which crack extension occurs.