Predicting deformation behavior of α-uranium during tension, compression, load reversal, rolling, and sheet forming using elasto-plastic, multi-level crystal plasticity coupled with finite elements
Predicting deformation behavior of α-uranium during tension, compression, load reversal, rolling, and sheet forming using elasto-plastic, multi-level crystal plasticity coupled with finite elements
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使用弹塑性、多级晶体塑性与有限元相结合来预测 α 铀在拉伸、压缩、反向载荷、轧制和板材成型过程中的变形行为
DOI：
10.1016/j.jmps.2020.103924
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发表时间：
2020
影响因子：
5.3
通讯作者：
Knezevic, Marko
中科院分区：
文献类型：
--
作者：
Barrett, Timothy J.;McCabe, Rodney J.;Brown, Donald W.;Clausen, Bjørn;Vogel, Sven C.;Knezevic, Marko
一种弹塑性自一致（EPSC）多晶塑性配方适用于模拟α-铀（α-U）的变形，该变形由弹性、位错滑动和变形孪晶组合而成。EPSC模型结合了应变路径、应变速率和基于温度敏感位错密度的硬化规律，用于抵抗滑移、孪晶和去孪晶的演变，以及滑移系统级的运动学反应力规律，以影响激活的驱动力。该模型解释了α- u随应变路径和温度的复杂变形行为。实验研究了不同初始取向分布的α- u试样在室温下的简单压缩、拉伸和载荷逆转以及在573 K下的准静态变形速率下的压缩和轧制过程。利用电子背散射衍射和原位和非原位中子衍射对变形过程中织构和孪晶的演变进行了表征。由于其低对称性的正交晶体结构和不同的晶体形变模式激活应力，材料的行为具有高度的各向异性。该模型在这些变形条件下进行了标定和验证，并通过一组参数预测了硬化和反应力演化规律的应力应变响应、孪晶数量、织构演化和晶格应变。随后，将所建立的模型作为本构律应用于隐式有限元框架中，模拟了半球形零件从α- u轧制薄板拉深的过程。在这里，FE-EPSC模型是一个两级均质方案，EPSC将晶粒级与多晶聚集级响应联系起来，而FE框架将多晶扩展到部分级响应。仿真结果和计算结果如位置依赖纹理演化等与实验结果吻合较好。
An elasto-plastic self-consistent (EPSC) polycrystal plasticity formulation is adapted to model deformation of wroughtα-uranium (α-U) accommodated by a combination of elasticity, dislocation glide, and deformation twinning. The EPSC model incorporates a strain-path, strain rate, and temperature sensitive dislocation density-based hardening law for the evolution of resistance to slip, twinning, and de-twinning and a slip system-level kinematic back-stress law to influence the driving force for activation. The model is used to interpret the complex deformation behavior ofα-U as a function of strain-path and temperature. Samples ofα-U with different initial orientation distributions are experimentally evaluated in simple compression, tension, and load reversal at room temperature and in compression and rolling at 573 K under a quasi-static deformation rate. Evolution of texture and twinning is characterized using electron backscattered diffraction and in-situ and ex-situ neutron diffraction during deformation. It is observed that the behavior of the material is highly anisotropic owing to its low-symmetry orthorhombic crystal structure and different activation stresses for crystallographic deformation modes. The model is calibrated and validated under these deformation conditions and predicts the stress-strain responses, amount of twinning, texture evolution, and lattice strains with one set of parameters for the hardening and back-stress evolution laws. Subsequently, the developed model is used as a constitutive law in the implicit finite element (FE) framework to simulate drawing of a hemispherical part from a rolled sheet ofα-U. Here, the FE-EPSC model is a two-level homogenization scheme with EPSC relating the grain-level to the polycrystalline aggregate-level response, while the FE framework scales the polycrystalline to the part-level response. The simulation results and insights from the calculations, such as location dependent texture evolution is in good agreement with experiments.
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影响因子：
9.4
作者：
Eghtesad, Adnan;Barrett, Timothy J.;Knezevic, Marko
通讯作者：
Knezevic, Marko
DOI：
10.1016/j.cma.2019.05.035
发表时间：
2019-09
影响因子：
7.2
作者：
T. Barrett;M. Knezevic
通讯作者：
T. Barrett;M. Knezevic
多晶立方-斜方微观结构一阶弹塑性闭包的快速计算
影响因子：
3.3
作者：
M. Knezevic;S. Kalidindi
通讯作者：
S. Kalidindi
用于预测马氏体转变应变路径依赖性的 Olson-Cohen 模型的晶体学扩展
影响因子：
9.4
作者：
Zecevic, Milovan;Upadhyay, Manas V.;Polatidis, Efthymios;Panzner, Tobias;Van Swygenhoven, Helena;Knezevic, Marko
通讯作者：
Knezevic, Marko
使用广义球谐函数减少晶体取向大数据集的程序
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
M. Knezevic;Nicholas W. Landry
通讯作者：
Nicholas W. Landry