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Development and application of a microstructure-based approach to characterize and model failure initiation in DP steels using XFEM

机译:基于微观结构的方法的开发和应用,用于使用XFEM表征和建模DP钢中的失效引发

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摘要

We develop a microstructure-based model to characterize and model failure initiation in DP steels using an extended finite element method (XFEM) to simulate martensite cracking on the mesoscale combined with representative volume element (RVE) modeling. A mini tensile test with digital image correlation (DIC) analysis is linked to local SEM analysis to identify the local strain at which failure is initiated. In-situ bending tests in SEM with electron backscatter diffraction (EBSD) measurements before and after the test are carried out to validate that the crack initiates in the martensite islands. Empirical equations for XFEM parameters as functions of local carbon content in martensite are fit to experimental results for laboratory-annealed DP600 steels with varying martensite content The equations are then shown to predict successfully failure initiation in industrially produced DP steels with various chemistries, strengths and martensite fractions.
机译:我们使用扩展的有限元方法(XFEM)开发了基于微观结构的模型,以表征和建模DP钢中的失效起始,以与代表体积元素(RVE)建模相结合的中尺度模拟马氏体开裂。具有数字图像相关性(DIC)分析的微型拉伸试验与局部SEM分析相链接,以识别引发故障的局部应变。在测试之前和之后在SEM中通过电子反向散射衍射(EBSD)测量进行原位弯曲测试,以验证裂纹是在马氏体岛中引发的。 XFEM参数作为马氏体中局部碳含量的函数的经验方程式适合于具有不同马氏体含量的实验室退火DP600钢的实验结果。然后显示了该方程式,可以成功预测具有不同化学性质,强度和马氏体的工业生产的DP钢的失效起始分数。

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