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首页> 外文期刊>Journal of Materials Engineering and Performance >Experimental Investigation of Strain-Rate- and Temperature-Dependent Mechanical Properties of SA516Gr.70 Steel and Development of an Appropriate Material Model
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Experimental Investigation of Strain-Rate- and Temperature-Dependent Mechanical Properties of SA516Gr.70 Steel and Development of an Appropriate Material Model

机译：SA516GR.70钢的应变率和温度依赖性机械性能的实验研究及适当材料模型的开发

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摘要

The objective of this work is to develop an appropriate strain-rate- and temperature-dependent material constitutive model to simulate plastic deformation behavior of SA516Gr.70 steel in the sub-zero temperature regime (- 128 to 25 degrees C). For this purpose, tests have been conducted at three different strain rates covering an order of 6 in the rates, i.e., from 0.001 to 1400/s. Tests at high strain rates have been conducted using a modified split Hopkinson pressure bar test setup. The tensile tests have been designed in such a way that the strain rate remains almost constant during the test. A critical comparison of results of both tension and compression high strain-rate tests has been carried out, and the suitability of tensile experiments has been highlighted. A modified Ramberg-Osgood model, with temperature- and strain-rate-dependent parameters, has been presented. The parameters of the new model have been evaluated from a large set of experimental data. It was observed that the yield stress and ultimate tensile strength of the material increase monotonically with decreasing temperature and increasing strain rates. The ductility at fracture and extent of uniform elongation of the specimen decrease for the intermediate strain rate of 0.925 s(-1), when compared to the corresponding values at quasistatic rate of loading. At very high rate of loading, ductility increases due to the increased resistance of the material to growth and coalescence of voids. From the comparison of results of model and experiment, it has been observed that the modified material model is able to predict the true stress-strain curve of the material satisfactorily in the sub-zero temperature regime over a wide range of strain rates. The nature of variation of mechanical properties with temperature and strain rate has been explained from the point of view of dislocation-based micromechanism of the plastic deformation process.
机译：本研究的目的是建立一个合适的应变率和温度相关的材料本构模型来模拟SA516Gr的塑性变形行为。70钢在零下温度范围（-128至25摄氏度）。为此，在三种不同的应变率下进行了试验，应变率约为6，即从0.001到1400/s。高应变率下的试验是使用改进的分离式霍普金森压杆试验装置进行的。拉伸试验的设计应确保试验期间应变率几乎保持不变。对拉伸和压缩高应变率试验的结果进行了严格的比较，并强调了拉伸试验的适用性。提出了一种修正的Ramberg-Osgood模型，该模型具有与温度和应变率相关的参数。新模型的参数已根据大量实验数据进行了评估。结果表明，材料的屈服应力和极限抗拉强度随温度的降低和应变速率的增加而单调增加。当中间应变速率为0.925 s（-1）时，与准静态加载速率下的相应值相比，试样的断裂韧性和均匀伸长率降低。在非常高的加载速率下，由于材料对孔洞生长和合并的阻力增加，塑性增加。从模型和实验结果的比较中可以看出，改进后的材料模型能够在较宽的应变率范围内满意地预测材料在零下温度区的真实应力-应变曲线。从微观力学角度解释了位错的力学性质和变形速率随温度变化的规律。

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