Mechanical and microstructural investigations of the biaxial Bauschinger effect in sheet metals
金属板材中双轴鲍辛格效应的机械和微观结构研究
基本信息
- 批准号:318682861
- 负责人:
- 金额:--
- 依托单位:
- 依托单位国家:德国
- 项目类别:Research Grants
- 财政年份:2016
- 资助国家:德国
- 起止时间:2015-12-31 至 2021-12-31
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
The well-known Bauschinger effect refers to changes of the yield stress associated with load reversal. Numerous studies have been reported on the Bauschinger effect under uniaxial loading and on the corresponding microstructural mechanisms. However, similar effects can be expected to occur under multi-axial loading conditions, particularly during deformation of sheet metals, where such effects may well be highly relevant for forming technology. In this research project, biaxial in-plane deformation of sheet metals with a load reversal from biaxial tension to biaxial compression is studied for the first time with a focus on biaxial Bauschinger effects. Special new experimental setups were developed at Technische Universität Chemnitz, allowing for uniaxial tension and compression testing, on the one hand, and for biaxial compression-compression testing, of sheet materials, on the other hand. These new mechanical testing methods will now be used to tackle the interesting materials science challenge of documenting biaxial Bauschinger effects, and to identify their microstructural origins. As model sheet materials, technologically pure aluminum (EN-AW 1050) and DC06 steel will be used. In detailed mechanical investigations, cruciform samples will be deformed (in collaboration with partners in Erlangen) systematically to different biaxial tensile strain levels, and then smaller samples will be cut from these samples and subjected to biaxial compressive loading. Complementary Finite Element simulations will be used to analyze the corresponding stress and strain states, with a special focus on the effect of textures in the sheet materials on anisotropic material behavior. Moreover, the simulations will allow for a separate consideration of strength differential effects. Special attention in this project will be paid to the identification and quantification of the microstructural mechanisms (most importantly, the formation and annihilation of dislocation cells) that strongly affect the biaxial Bauschinger effects during the various deformation stages, by extensively using electron microscopy (SEM, EBSD, STEM, TEM, transmission Kikuchi diffraction) and X-ray diffraction methods. Furthermore, the generation and evolution of residual stresses during the loading history will be considered in detail and related to microstructural observations using X-ray diffraction. Both ex situ measurements of samples after different amounts of deformation (prior to and after the load reversal), and in situ measurements during biaxial deformation will be performed, the latter in collaboration with colleagues from Villigen, Switzerland, at the dedicated POLDI setup for neutron diffraction.
众所周知的包辛格效应是指与载荷反向相关的屈服应力的变化。关于单轴加载下的包申格效应和相应的微观结构机制,已有大量的研究报道。然而,在多轴向加载条件下,特别是在金属板变形期间,可以预期会发生类似的效应,其中这种效应可能与成形技术高度相关。在这项研究项目中,双轴面内变形的金属板的双向拉伸与双向压缩的负载反转研究的第一次,重点是双轴Bauschinger效应。切姆尼茨工业大学开发了特殊的新实验装置,一方面可以进行单轴拉伸和压缩测试,另一方面可以进行板材的双轴压缩-压缩测试。这些新的力学测试方法现在将用于解决记录双轴Bauschinger效应的有趣材料科学挑战,并确定其微观结构起源。作为模型板材,将使用技术纯铝(EN-AW 1050)和DC 06钢。在详细的力学研究中,将十字形样品系统地变形(与埃尔兰根的合作伙伴合作)至不同的双轴拉伸应变水平,然后从这些样品中切割较小的样品并承受双轴压缩载荷。补充有限元模拟将用于分析相应的应力和应变状态,特别关注板材中的纹理对各向异性材料行为的影响。此外,模拟将允许单独考虑强度差异效应。本项目将特别关注通过广泛使用电子显微镜(SEM、EBSD、STEM、TEM、透射菊池衍射)和X射线衍射方法,对在不同变形阶段强烈影响双轴Bauschinger效应的微观结构机制(最重要的是位错胞的形成和湮灭)进行识别和量化。此外,在加载历史过程中的残余应力的产生和演变将被详细考虑,并与使用X射线衍射的微观结构观察。在不同量的变形(之前和之后的负载反转),并在双轴变形过程中原位测量样品的非原位测量将进行,后者与来自瑞士维利根的同事合作,在专用的POLDI中子衍射设置。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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Professor Dr.-Ing. Martin Franz-Xaver Wagner其他文献
Professor Dr.-Ing. Martin Franz-Xaver Wagner的其他文献
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{{ truncateString('Professor Dr.-Ing. Martin Franz-Xaver Wagner', 18)}}的其他基金
Heat treatments, microstructures and properties of TRIP steels without hold time during the Bainite transformation
贝氏体转变过程中无保温时间的 TRIP 钢的热处理、显微组织和性能
- 批准号:
281456923 - 财政年份:2015
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Research Grants
Local microstructural evolution, interfacial integrity and rate effects associated with modern joining processes using plastic deformation
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- 批准号:
227758514 - 财政年份:2012
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Priority Programmes
Einfluss der Ausgangsgefüge auf die Werkstoffeigenschaften von Stählen nach dem Minithixoforming
初始组织对微触变成形后钢材材料性能的影响
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191272416 - 财政年份:2010
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Offene Fragen zur Zwillingsbildung in funktionellen und strukturellen Ingenieurwerkstoffen
关于功能和结构工程材料孪生的开放问题
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40116301 - 财政年份:2007
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Independent Junior Research Groups
Effect of multi-phase microstructures on rate-dependent shear band formation in the meta-stable beta-titanium alloy Ti-10V-2Fe-3Al
多相微观结构对亚稳β钛合金Ti-10V-2Fe-3Al中速率相关剪切带形成的影响
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438934157 - 财政年份:
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TP2: Thermomechanical characterization and microstructural analysis of the interaction of shear bands with elements of the microstructure
TP2:剪切带与微观结构元素相互作用的热机械表征和微观结构分析
- 批准号:
506489666 - 财政年份:
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Quantitative analysis of local deformation and direct correlation with microstructural and mechanical parameters during equal channel angular pressing in tools with variable geometries
可变几何形状工具等通道角冲压过程中局部变形的定量分析以及与微观结构和机械参数的直接相关性
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465563128 - 财政年份:
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