Model-based description of bond formation, evolution and failure in multi-pass roll bonding processes

基于模型的多道辊压粘合过程中粘合形成、演变和失效的描述

• 批准号: 317614920
• 负责人: Professor Dr.-Ing. Gerhard Hirt
• 金额: --
• 依托单位: Hydro Aluminium Deutschland GmbH
• 依托单位国家: 德国
• 项目类别: Research Grants (Transfer Project)
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/317614920?language=en
• 关键词: Model; based; description; bond; formation

In the context of the preceding project, a laboratory experiment to analyze the bond formation and to subsequently characterize the bond strength was developed. The results of the laboratory experiments were then used to calibrate a user-subroutine (UINTER) for the material combination AA1050/AA2024. Based on simulations of single roll bonding passes - using the UINTER based modelling approach - the experimentally observed separation of the bond during the rolling process could be qualitatively confirmed. Within this project the next step will be the further development of the characterization and modelling method towards a description of multi-pass roll bonding processes as well as the model validation. The material combination AA6016/AA8079 which cannot be processed industrial at the moment but is of great interest for usage in the automobile manufacturing is to be investigated. The core made of AA6016 is a standard precipitation-hardening aluminum alloy and the surface layer made of AA8079 is a nearly pure aluminum alloy with small quantities of iron and silicon. This results in a high formability and corrosion resistance. To analyze multi-pass roll bonding processes, in particular the temperature evolution in the material and the effect of diffusion in between the rolling passes has to be characterized and taken into account during the modelling. Furthermore, the higher accumulated deformation and the interpass times between the rolling passes require improvements in the numerical stability of the solution algorithm. Therefore, the objectives of the present knowledge transfer project are: 1) Characterization of a parameter field to calibrate the user-subroutine (UINTER) for the investigated material combination (AA6016/AA8079) based on the laboratory experiment developed in the previous project. 2) Additional development of a multi-step laboratory experiments to characterize the influence of diffusion in between the rolling passes, for a detailed description of the evolution of bond strength. 3) Improvement of the process- and bonding model to describe and analyze reversing or continues multi-pass roll bonding processes. - Regarding the bonding model this requires the description of the bond strength evolution during forming and in the interpass times. - Regarding the process model the heat exchange with the surrounding and the rolls has to be considered. Additional, if the single pass deformations in the process degradate the mesh the bond strength needs to be transferred to a new mesh for the next pass. 4) Validation of the improved process and bonding model by comparison of the results with rolling experiments conducted on the laboratory rolling mill of the project partner.

在前一个项目的背景下，开发了一个实验室实验来分析粘结形成，并随后表征粘结强度。实验室实验的结果然后用于校准材料组合AA 1050/AA 2024的用户子程序（UINTER）。基于单辊键合道次的模拟-使用基于UINTER的建模方法-可以定性地证实在轧制过程中实验观察到的键合分离。在该项目中，下一步将是进一步开发表征和建模方法，以描述多道次辊压焊工艺以及模型验证。材料组合AA 6016/AA 8079目前不能在工业上加工，但在汽车制造中的使用非常感兴趣，将被研究。由AA 6016制成的芯是标准的沉淀硬化铝合金，由AA 8079制成的表面层是具有少量铁和硅的几乎纯的铝合金。这导致高的可成形性和耐腐蚀性。为了分析多道次辊压焊接工艺，特别是材料中的温度变化和轧制道次之间的扩散效应，必须在建模过程中加以表征和考虑。此外，较高的累积变形和轧制道次之间的道次间隔时间需要改进的数值稳定性的解决方案的算法。因此，本知识转移项目的目标是：1）参数字段的表征，以校准用户子程序（UINTER）的研究材料组合（AA 6016/AA 8079）的基础上，在以前的项目开发的实验室实验。2)进一步发展多步骤实验室实验，以表征轧制道次之间扩散的影响，详细描述结合强度的演变。3)改进工艺和键合模型，以描述和分析反向或连续多道次辊压键合工艺。- 关于粘结模型，这需要描述成形过程中和层间时间内的粘结强度演变。- 关于过程模型，必须考虑与周围环境和辊的热交换。此外，如果过程中的单次变形使补片退化，则需要将粘合强度转移到新补片上以进行下一次通过。4)通过与在项目合作伙伴的实验室轧机上进行的轧制实验结果进行比较，验证改进的工艺和结合模型。

项目成果

A New Coupled Thermal Stress FE-Model for Investigating the Influence of Non-Isothermal Conditions on Bond Strength and Bonding Status of the First Pass in Roll Bonding

一种新的耦合热应力有限元模型，用于研究非等温条件对滚压粘合第一道次粘合强度和粘合状态的影响

• DOI: 10.4028/www.scientific.net/kem.767.301
• 发表时间: 2018
• 期刊: Key Engineering Materials
• 作者: Z. Liu;A. Krämer;K. F. Karhausen;H. Aretz;M. Teller;G. Hirt
• 通讯作者: G. Hirt

Characterizing multi-pass conditions for roll bonding of aluminum alloys

表征铝合金滚压接合的多道次条件

• DOI: 10.1063/1.5112578
• 发表时间: 2019
• 期刊: PROCEEDINGS OF THE 22ND INTERNATIONAL ESAFORM CONFERENCE ON MATERIAL FORMING: ESAFORM 2019
• 作者: A. Krämer;Z. Liu;K. F. Karhausen;H. Aretz;M. Teller;G. Hirt
• 通讯作者: G. Hirt