Abstract Ductile tearing resistance of a 1 mm thick interstitial free steel sheet has been characterized using single edge notched tensile (SENT) specimens with or without fatigue precracks at quasistatic strain rates. In this study, the critical Crack Tip Opening Angle (CTOA), and also crack initiation parameters, namely the initiation energy per unit ligament area ( w i ), critical value for the J -integral ( J c ), and critical crack tip opening displacement ( δ c ) have been examined and compared with the corresponding parameters from the Essential Work of Fracture (EWF) method. Dependence of these parameters on specimen geometry has also been examined. The EWF paradigm has been extended to the initial mixed-constraint regime of crack extension. 3D cohesive zone modelling for flat fracture becomes reasonably successful in simulating crack growth in the SENT specimens.

中文翻译：

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使用 SENT 试样评估无间隙钢板的韧性撕裂强度

摘要 1 mm 厚的无间隙钢板的韧性撕裂强度已使用单边缺口拉伸 (SENT) 试样在准静态应变速率下具有或不具有疲劳预裂纹进行表征。在本研究中，临界裂纹尖端张开角 (CTOA) 以及裂纹起始参数，即每单位韧带面积的起始能量 (wi)、J 积分的临界值 (Jc) 和临界裂纹尖端张开位移( δ c ) 已经过检查并与断裂基本功 (EWF) 方法中的相应参数进行了比较。还研究了这些参数对试样几何形状的依赖性。EWF 范式已扩展到裂纹扩​​展的初始混合约束机制。