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首页> 外文会议>ASME Rail Transportation Division Conference >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：利用裂缝裂缝的冲击能量分析轨道箱汽车钢制成不全

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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：本文介绍了非线性有限元分析（FEA）框架，其通过传播的超大的非标准摆锤（BFCM）通过超大的非标准摆射来检查冲击能量以破裂不全的夏虫标本。标本由铁路罐车制成，具有不同的厚度，与不同的锐度与冲击性相互作用。 FEA采用Ramberg-Osgood方程进行塑性变形。逐步损伤和失效建模适用于预测骨折和最终材料衰竭的启动和演变。在材料建模中比较了两种类型的裂缝启动标准，即恒定的等效应变标准和应力三轴依赖等同的应变标准。断裂BFCM样本所需的冲击能量由FEA计算。与测试数据的比较表明，使用应力三轴性依赖性骨折标准获得的FEA结果与BFCM测试数据非常一致。

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