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Fracture Toughness Analysis of Automotive-Grade Dual-Phase Steel Using Essential Work of Fracture (EWF) Method
Metals ( IF 2.9 ) Pub Date : 2020-07-29 , DOI: 10.3390/met10081019
Sunil Kumar M R , Eva Schmidova , Pavel Konopík , Daniel Melzer , Fatih Bozkurt , Neelakantha V Londe

Fracture toughness determination of dual-phase DP450 steel using the essential work of fracture (EWF) methodology is the major focus of this research work. The EWF method is used for the determination of fracture toughness of thin sheets in a plane stress dominant condition. The EWF method is discussed in detail with the help of DP450 steel experimental results. Double edge notched tension (DENT) specimens with fatigue pre-crack and without fatigue crack (notched) have been used for testing. Specific essential work of fracture (we), crack tip opening displacement (δce) and crack tip opening angle (ψe) parameters were used for the comparative analysis. High-intensity laser beam cutting technology was used for the preparation of notches. Fracture toughness values of fatigue pre-cracked and notched samples were compared. The effect of notch tip radius and fatigue crack on the fracture toughness values were analysed. Digital image correlation (DIC) technology was used for the identification of local strain distribution and validation of the methodology. Fractured surfaces were examined by a scanning electron microscope (SEM) to analyse the fracture morphology and stress state.

中文翻译:

基于断裂基本功(EWF)的汽车级双相钢断裂韧性分析

使用断裂的基本功(EWF)方法确定双相DP450钢的断裂韧性是本研究工作的重点。EWF方法用于确定在平面应力主导条件下薄片的断裂韧性。借助DP450钢的实验结果详细讨论了EWF方法。具有疲劳预裂纹但无疲劳裂纹(缺口)的双边缺口拉伸(DENT)试样已用于测试。断裂的特定基本功(w e),裂纹尖端的开度位移(δCË)和裂纹尖端的张开角度(ψË)参数用于比较分析。使用高强度激光束切割技术来制备缺口。比较了疲劳裂纹和缺口样品的断裂韧性值。分析了缺口尖端半径和疲劳裂纹对断裂韧性值的影响。数字图像关联(DIC)技术用于确定局部应变分布并验证该方法。用扫描电子显微镜(SEM)检查断裂表面,以分析断裂形态和应力状态。
更新日期:2020-07-29
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