{"title":"具有纹理梯度的挤压镁-10钆棒的晶体塑性有限元模拟","authors":"","doi":"10.1016/j.jma.2024.08.009","DOIUrl":null,"url":null,"abstract":"<div><div>The mechanical properties of an extruded Mg-10Gd sample, specifically designed for vascular stents, are crucial for predicting its behavior under service conditions. Achieving homogeneous stresses in the hoop direction, essential for characterizing vascular stents, poses challenges in experimental testing based on standard specimens featuring a reduced cross section. This study utilizes an elasto-visco-plastic self-consistent polycrystal model (ΔEVPSC) with the predominant twinning reorientation (PTR) scheme as a numerical tool, offering an alternative to mechanical testing. For verification, various mechanical experiments, such as uniaxial tension, compression, notched-bar tension, three-point bending, and C-ring compression tests, were conducted. The resulting force vs. displacement curves and textures were then compared with those based on the ΔEVPSC model. The computational model's significance is highlighted by simulation results demonstrating that the differential hardening along with a weak strength differential effect observed in the Mg-10Gd sample is a result of the interplay between micromechanical deformation mechanisms and deformation-induced texture evolution. Furthermore, the study highlights that incorporating the axisymmetric texture from the as-received material incorporating the measured texture gradient significantly improves predictive accuracy on the strength in the hoop direction. Ultimately, the findings suggest that the ΔEVPSC model can effectively predict the mechanical behavior resulting from loading scenarios that are impossible to realize experimentally, emphasizing its valuable contribution as a digital twin.</div></div>","PeriodicalId":16214,"journal":{"name":"Journal of Magnesium and Alloys","volume":null,"pages":null},"PeriodicalIF":15.8000,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.sciencedirect.com/science/article/pii/S2213956724002810/pdfft?md5=8267ddd6a5db08a12120ca12f592bd79&pid=1-s2.0-S2213956724002810-main.pdf","citationCount":"0","resultStr":"{\"title\":\"Crystal plasticity finite element simulations on extruded Mg-10Gd rod with texture gradient\",\"authors\":\"\",\"doi\":\"10.1016/j.jma.2024.08.009\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>The mechanical properties of an extruded Mg-10Gd sample, specifically designed for vascular stents, are crucial for predicting its behavior under service conditions. Achieving homogeneous stresses in the hoop direction, essential for characterizing vascular stents, poses challenges in experimental testing based on standard specimens featuring a reduced cross section. This study utilizes an elasto-visco-plastic self-consistent polycrystal model (ΔEVPSC) with the predominant twinning reorientation (PTR) scheme as a numerical tool, offering an alternative to mechanical testing. For verification, various mechanical experiments, such as uniaxial tension, compression, notched-bar tension, three-point bending, and C-ring compression tests, were conducted. The resulting force vs. displacement curves and textures were then compared with those based on the ΔEVPSC model. The computational model's significance is highlighted by simulation results demonstrating that the differential hardening along with a weak strength differential effect observed in the Mg-10Gd sample is a result of the interplay between micromechanical deformation mechanisms and deformation-induced texture evolution. Furthermore, the study highlights that incorporating the axisymmetric texture from the as-received material incorporating the measured texture gradient significantly improves predictive accuracy on the strength in the hoop direction. 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引用次数: 0
摘要
专为血管支架设计的挤压 Mg-10Gd 样品的机械性能对于预测其在使用条件下的行为至关重要。实现环向均匀应力是鉴定血管支架特性的关键,但在基于横截面缩小的标准试样的实验测试中却面临挑战。本研究利用弹性-粘弹性自洽多晶体模型(ΔEVPSC)和主要孪晶重新定向(PTR)方案作为数值工具,为机械测试提供了一种替代方法。为进行验证,进行了各种机械试验,如单轴拉、压、缺口杆拉、三点弯曲和 C 环压缩试验。然后将得出的力与位移曲线和纹理与基于 ΔEVPSC 模型的曲线和纹理进行比较。模拟结果表明,在 Mg-10Gd 样品中观察到的差异硬化和微弱的强度差异效应是微机械变形机制和变形诱导的纹理演变之间相互作用的结果,这凸显了计算模型的重要性。此外,该研究还强调,结合测量到的纹理梯度,从接收材料中提取轴对称纹理可显著提高箍向强度的预测精度。最终,研究结果表明,ΔEVPSC 模型可以有效预测实验中不可能实现的加载情况下产生的力学行为,强调了其作为数字孪生模型的宝贵贡献。
Crystal plasticity finite element simulations on extruded Mg-10Gd rod with texture gradient
The mechanical properties of an extruded Mg-10Gd sample, specifically designed for vascular stents, are crucial for predicting its behavior under service conditions. Achieving homogeneous stresses in the hoop direction, essential for characterizing vascular stents, poses challenges in experimental testing based on standard specimens featuring a reduced cross section. This study utilizes an elasto-visco-plastic self-consistent polycrystal model (ΔEVPSC) with the predominant twinning reorientation (PTR) scheme as a numerical tool, offering an alternative to mechanical testing. For verification, various mechanical experiments, such as uniaxial tension, compression, notched-bar tension, three-point bending, and C-ring compression tests, were conducted. The resulting force vs. displacement curves and textures were then compared with those based on the ΔEVPSC model. The computational model's significance is highlighted by simulation results demonstrating that the differential hardening along with a weak strength differential effect observed in the Mg-10Gd sample is a result of the interplay between micromechanical deformation mechanisms and deformation-induced texture evolution. Furthermore, the study highlights that incorporating the axisymmetric texture from the as-received material incorporating the measured texture gradient significantly improves predictive accuracy on the strength in the hoop direction. Ultimately, the findings suggest that the ΔEVPSC model can effectively predict the mechanical behavior resulting from loading scenarios that are impossible to realize experimentally, emphasizing its valuable contribution as a digital twin.
期刊介绍:
The Journal of Magnesium and Alloys serves as a global platform for both theoretical and experimental studies in magnesium science and engineering. It welcomes submissions investigating various scientific and engineering factors impacting the metallurgy, processing, microstructure, properties, and applications of magnesium and alloys. The journal covers all aspects of magnesium and alloy research, including raw materials, alloy casting, extrusion and deformation, corrosion and surface treatment, joining and machining, simulation and modeling, microstructure evolution and mechanical properties, new alloy development, magnesium-based composites, bio-materials and energy materials, applications, and recycling.