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首页> 外文期刊>Journal of Materials Engineering and Performance >Forming Limit Diagrams of Low-Carbon Steels Obtained Using Digital Image Correlation Technique and Enhanced Formability Predictions Incorporating Microstructural Developments
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Forming Limit Diagrams of Low-Carbon Steels Obtained Using Digital Image Correlation Technique and Enhanced Formability Predictions Incorporating Microstructural Developments

机译：使用数字图像相关技术获得的低碳钢的限制图，增强了组织显影的增强型成形性预测

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摘要

In the present work, drawing quality (DQ) and interstitial-free (IF) steel sheets were subjected to limiting dome height tests for determining strain-based forming limit diagrams (FLDs) experimentally and effect of dynamic (variable) material properties, such as work hardening 'n' and plastic anisotropy ((r) over bar), on FLDs has been studied and simulated by PAMSTAMP (TM) finite element software. Dot prints on the steel specimens and an efficient optical strain measurement system GOM (TM) which works on the digital image correlation technique principle were used to measure limiting strains accurately instead of conventional circle grid analysis technique and strain measurement by traveling microscope. The dynamic (variable) material properties (n) and ((r) over bar) were estimated by studying the microstructural developments in terms of changes in grain average misorientation and crystallographic texture, respectively, at different strains and strain paths, during deformation. In our proposed work, a novel technique of incorporating dynamic (variable) material properties (n and (r) over bar) in FE simulations was carried out during FLDs predictions. Though marginal but improved predictions in FLDs were observed in both IF and DQ steels. In addition to strain-based FLDs, stress-based FLDs were also determined for both grades. Interestingly, in both cases it was noticed that IF steel had higher formability than DQ steel.
机译：在本作本工作中，绘制质量（DQ）和无间隙（IF）钢板限制圆顶高度测试，用于确定基于应变的成形限制图（FLD）实验和动态（可变）材料特性的影响，例如通过PAMSTAMP（TM）有限元软件研究和模拟了FLDS的硬化'n'和塑料各向异性（（r）上的塑料各向异性（（r））。钢标本上的点印和一个有效的光学应变测量系统GOM（TM），用于准确地测量限制菌株，而不是通过行进显微镜来测量常规圆形网格分析技术和应变测量。通过在变形期间分别在不同菌株和应变路径上分别在晶粒平均错位和晶体纹理的变化方面研究微观结构的显影来估计动态（可变）材料特性（N）和（（R）含量）。在我们提出的工作中，在FLDS预测期间进行了在FE模拟中掺入Fe模拟中的动态（可变）材料特性（N和（R）的动态（变量）材料特性（N和（R））的新技术。虽然在IF和DQ钢中观察到FLD的边缘而且改善了FLD的预测。除了基于应变的FLD之外，还针对两种等级确定基于应力的FLD。有趣的是，在这两种情况下，都注意到，如果钢的成形性高于DQ钢。

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