AA5083管材HGMF工艺理论及数值分析

发布时间：2018-05-14 19:50

本文选题：铝合金 + 管材　；参考：《燕山大学》2015年硕士论文

【摘要】：本课题来源国家青年科学基金项目,轻合金管状构件热态颗粒介质压力成形工艺及理论研究,项目编号:51305386。固体颗粒介质热成形工艺(Hot Solid Granule Medium Forming Technology,简称HGMF工艺)是采用耐热固体颗粒介质代替现有软模热成形工艺中液体或气体介质的作用,来实现轻合金管、板材构件成形的工艺方法。该工艺具有颗粒介质易于密封,压力建立简便,承温范围广,压力分布不均等优点。该工艺的研发为高强度、低塑性、难变形管材以及复杂形状、高尺寸精度和表面质量要求高的轻合金管状构件的热成形制造提供了新的技术和手段,具有广阔的应用前景。本文以5系铝合金焊接管材为研究对象,以耐热固体颗粒为传压媒介,对AA5083管材构件的HGMF工艺进行理论分析和数值仿真。开展了AA5083管材热态材料性能试验和热态颗粒介质传压规律试验,以此为基础进行管材成形性能的理论分析,建立了HGMF工艺管材成形数值仿真模型,细致讨论了工艺参数对管材零件成形性能的影响,为AA5083管材颗粒介质热成形的深入研究提供了数据支持。本文研制了管材热态下的环向拉伸装置,进行了AA5083管材的力学性能测试与研究。通过热态下管材的单向拉伸实验,获取不同温度、应变速率条件下的真实应力—应变曲线,并给出本构关系的数学描述;研究了温度、应变速率对屈强比、延伸率、厚向异性等参数对材料性能的影响;通过断口形貌观测,分析管材断裂特征和成因。与此同时,研制了热态固体颗粒介质体积压缩率、侧压系数及传压规律实验装置,进行了热态固体颗粒介质(GM颗粒)力学特性及传压规律研究,测试不同粒径介质在不同温度条件下的体积压缩率和侧压力分布曲线;在热态颗粒介质力学性能及传压规律试验基础之上,应用有限元方法研究颗粒介质在压缩过程中的压力传递规律;基于热态下材料的力学性能试验、固体颗粒的传压性能试验以及ABAQUES有限元软件平台,对AA5083管材HGMF工艺进行理论分析和数值仿真,建立AA5083管材自由胀形和管端进给胀形下的HGMF工艺理论分析及数值仿真模型,得到了不同胀形条件下的主应变轨迹,胀形形状及其壁厚分布情况。
[Abstract]:This subject comes from the project of National Youth Science Foundation, Technology and Theory Research of Hot granular Media pressure forming of Light Alloy Tubular component, item No.: 51305386. Hot Solid Granule Medium Forming Technology, (HGMF process) is a heat resistant solid particle medium used to replace the liquid or gas medium in the existing soft die hot forming process to realize the forming process of light alloy tube and sheet metal. The process has the advantages of easy sealing of granular medium, simple pressure establishment, wide temperature bearing range and uneven pressure distribution. The research and development of this process provides a new technology and means for the hot forming manufacture of light alloy tubular members with high strength, low plasticity, difficult deformation, complex shape, high size precision and high surface quality, and has a broad application prospect. In this paper, the theoretical analysis and numerical simulation of the HGMF process of AA5083 pipe components are carried out by taking 5 series aluminum alloy welded pipes as the research object and heat resistant solid particles as the pressure transmission medium. In this paper, the hot material performance test and hot particle medium pressure transfer test of AA5083 pipe are carried out. Based on this, the theoretical analysis of tube forming property is carried out, and the numerical simulation model of HGMF process pipe forming is established. The influence of process parameters on the forming properties of pipe parts is discussed in detail, which provides data support for the further research of AA5083 pipe particle medium hot forming. In this paper, a hoop drawing device for AA5083 pipe under hot state is developed, and the mechanical properties of AA5083 pipe are tested and studied. The true stress-strain curves at different temperatures and strain rates are obtained through uniaxial tensile tests of the tubes in hot state, and the mathematical description of the constitutive relations is given, and the effect of temperature and strain rate on the yield ratio and elongation is studied. The influence of parameters such as thickness anisotropy on the properties of the material and the fracture characteristics and origin of the pipe were analyzed by the observation of fracture morphology. At the same time, the experimental device of volume compressibility, lateral pressure coefficient and pressure transfer law of hot solid particle medium is developed. The mechanical properties and pressure transfer law of GM particle in hot solid particle medium are studied. The volume compressibility and lateral pressure distribution curves of different particle size media at different temperatures were measured, and the mechanical properties and pressure transfer law of hot particle medium were tested. The finite element method is used to study the pressure transfer law of granular media during compression, based on the mechanical properties of materials in hot state, the compression properties of solid particles and the ABAQUES finite element software platform. The theoretical analysis and numerical simulation of AA5083 tube HGMF process are carried out, and the theoretical analysis and numerical simulation model of HGMF process under free bulging and feed bulging at the end of AA5083 pipe are established, and the main strain trajectories under different bulging conditions are obtained. Bulging shape and wall thickness distribution.
【学位授予单位】：燕山大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TG306

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