Experimental investigations and modelling of strain rate and temperature effects on the flow behaviour of 1045 steel
Experimental investigations and modelling of strain rate and temperature effects on the flow behaviour of 1045 steel
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应变率和温度对 1045 钢流动行为影响的实验研究和建模
DOI：
10.1051/jp4:2006134013
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
Razorenov
中科院分区：
文献类型：
--
作者：
Herzig;Krüger;Razorenov
如果结构必须设计为承受低和高的加载速率，适当的本构方程是必不可少的结构响应的准确建模。然而，缺乏所需的数据是经常观察到的，特别是，如果一个非常广泛的应变率必须涵盖。因此，1045钢（C45 E）的流动行为进行了研究，定义的化学成分和显微组织在一个非常宽的范围内的应变速率之间的10-4和10 - 5 1/s和不同的温度。率相关的热机械行为，确定使用低应变率（10-4至10 0 1/s）的伺服液压压缩试验，高应变率（~ 10 2 1/s和10 3 1/s）的压缩落锤试验和分离式霍普金森压杆试验，并为非常高的应变率（10 5 1/s）的平板冲击试验。此外，在相对较低的应变速率和不同的温度下进行应变速率跳跃测试，以确定在恒定温度和变形的激活体积。测量的流变应力以及应变和应变速率硬化行为作为应变速率和测试温度的函数进行了讨论的微观结构变形过程。热激活流理论的应用和广泛使用的模型，如约翰逊-库克模型和位错阻力模型进行比较。可能的位错拖曳效应的发生进行了讨论，结合测量数据。结果表明，1045钢流变应力的应变速率依赖性完全可以用热激活理论来描述，应变速率可达1051/s。
If structures have to be designed to sustain low and high loading rates, the appropriate constitutive equations are essential for the accurate modelling of the structural response. However, a lack of the required data is observed very often, especially, if a very wide range of strain rates has to be covered. Therefore, the flow behaviour of the steel 1045 (C45E) was investigated with defined chemical composition and microstructure in a very wide range of strain rates between 10-4 and 10 5 1/s and different temperatures. The rate-dependent thermomechanical behaviour was determined using low strain rate (10-4 to 10 0 1/s) servo-hydraulic compression testing, high strain rate (~ 10 2 1/s and 10 3 1/s) compression drop weight testing and split Hopkinson pressure bar testing, and for very high strain rates (10 5 1/s) the plate-impact test. Additionally, strain rate jump tests at relatively low strain rates and different temperatures were performed to determine the activation volume at constant temperature and deformation. The measured flow stresses as well as the strain and strain rate hardening behaviour as a function of strain rate and test temperature are discussed in terms of the microstructural deformation processes. The theory of thermally activated flow is applied and compared to the widely used models like the Johnson-Cook model and a dislocation drag model. The occurrence of possible dislocation drag effects is discussed in conjunction with the measured data. Our results show, that the strain rate dependence of the flow stress of 1045 steel can be described completely by the theory of thermal activation up to strain rates of 10 5 1/s.
温度变化、变形和跨度的变形和变形
DOI：
--
发表时间：
2005
期刊：
影响因子：
--
作者：
M.Sc. Shawky Abdel
通讯作者：
M.Sc. Shawky Abdel