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首页> 外文会议>国际断裂力学2009年会 >Application of stress-triaxiality dependent fracture criteria for unnotched Charpy specimens
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Application of stress-triaxiality dependent fracture criteria for unnotched Charpy specimens

机译：应力三轴性断裂准则在无缺口夏比试样中的应用

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摘要

Nonlinear dynamic finite element analysis (FEA) is conducted to simulate the fracture of unnotched Charpy specimens of steel under pendulum impact loading by a dedicated,oversized and nonstandard Bulk Fracture Charpy Machine (BFCM).A phenomenological.stress-triaxiality dependent fracture initiation criterion and a strain softening law for fracture evolution are incorporated in the constitutive relations to predict material failure.The impact energy needed to fracture an unnotched Charpy specimen in a BFCM test can be two orders of magnitude higher than the fracture energy of a Charpy V-notch specimen.FEA results of the BFCM fracture energy compare favorably to the corresponding experimental data.In addition,correlations of fracture energy with specimen geometry,impactor tup width and material type based on the FEA simulations are in excellent agreement with the experimental data.Moreover,the analyses show that the fracture through the thickness of the specimen ranges from shear to ductile modes,demonstrating the importance of applying stress state dependent fracture initiation criteria.Modeling the strain softening behavior is aimed at capturing the residual load carrying capability beyond fracture initiation in a ductile metal.Without the softening branch in a stress-strain curve,the total fracture energy can be significantly under predicted.Applications of the presented failure model in predicting the fracture of other structures are further discussed.
机译：非线性动态有限元分析（FEA）通过专用，超大型和非标准的块状断裂夏比机（BFCM）进行了摆锤冲击载荷作用下未缺口夏比试样的断裂模拟。在本构关系中结合了用于断裂发展的应变软化定律，以预测材料的破坏。在BFCM测试中断裂无缺口的夏比试样所需的冲击能比夏比的V型缺口试样的断裂能高两个数量级。 BFCM断裂能的FEA结果与相应的实验数据相吻合。此外，基于FEA模拟的断裂能与试样几何形状，冲击堆宽和材料类型的相关性与实验数据非常吻合。分析表明，贯穿试样厚度的断裂范围从剪切到导管应变软化行为的建模旨在捕获延性金属中超出断裂起始的残余载荷承载能力。在应力-应变曲线中没有软化分支的情况下，总应力断裂能可以大大地被预测。进一步讨论了所提出的破坏模型在预测其他结构断裂中的应用。

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