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首页> 外文会议>American Society of Mechanical Engineers(ASME) Rail Transportation Division Fall Conference; 20070911-12; Chicago,IL(US) >ANALYSIS OF IMPACT ENERGY TO FRACTURE UNNOTCHED CHARPY SPECIMENS MADE FROM RAILROAD TANK CAR STEEL
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ANALYSIS OF IMPACT ENERGY TO FRACTURE UNNOTCHED CHARPY SPECIMENS MADE FROM RAILROAD TANK CAR STEEL

机译：铁路罐车钢制裂口缺口脆性试样的冲击能分析

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摘要

This paper describes a nonlinear finite element analysis (FEA) framework that examines the impact energy to fracture unnotched Charpy specimens by an oversized; nonstandard pendulum impactor called the Bulk Fracture Charpy Machine (BFCM); The specimens are made from railroad tank car steel; have different thicknesses and interact with impact tups with different sharpness; The FEA employs a Ramberg-Osgood equation for plastic deformations; Progressive damage and failure modeling is applied to predict initiation and evolution of fracture and ultimate material failure. Two types of fracture initiation criterion, i.e., the constant equivalent strain criterion and the stress triaxiality dependent equivalent strain criterion, are compared in material modeling. The impact energy needed to fracture a BFCM specimen is calculated from the FEA. Comparisons with the test data show that the FEA results obtained using the stress triaxiality dependent fracture criterion are in excellent agreement with the BFCM test data.
机译：本文介绍了一个非线性有限元分析（FEA）框架，该框架检查了冲击能量对过大尺寸的无缺口夏比试样的破坏。非标准摆锤冲击器，称为大块断裂夏比机器（BFCM）；标本由铁路槽车钢制成；具有不同的厚度，并与具有不同清晰度的冲击套相互作用；有限元分析采用了Ramberg-Osgood方程来进行塑性变形。渐进式破坏和破坏模型用于预测断裂的开始和演化以及最终的材料破坏。在材料建模中比较了两种类型的断裂起始准则，即恒定等效应变准则和依赖于应力三轴性的等效应变准则。根据FEA计算出使BFCM试样断裂所需的冲击能。与测试数据的比较表明，使用依赖于应力三轴性的断裂准则获得的FEA结果与BFCM测试数据非常吻合。

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