锻压技术

基于Deform-2D的连续钢丝增强铝基复合棒料挤压流变规律

英文标题：Extrusion rheological law on continuous steel-wire-reinforced aluminum-based composite bar based on Deform-2D

作者：刘明甫张存生孟子杰杨文杰贺海鑫

分类号：TG31

出版年,卷(期):页码：2021,46(9):177-183

摘要：

设计了一种连续纤维增强铝基复合圆棒的挤压模具，基于Deform-2D软件对其挤压全过程进行二维数值仿真，研究了复合型材挤压过程中材料的流变规律和挤压焊合路径上各物理场的分布特征，并通过挤压实验获得了连续钢丝增强的铝基复合圆棒。研究结果表明，钢丝上的应力集中是由焊合室内的三向压应力和坯料的流速不均造成的。在复合型材挤压过程中，钢丝与铝基体间的结合首先依赖于焊合室内的焊合压力，随后其在模口外的粘结作用主要取决于挤压温度。在焊合路径上，较高的挤压温度、焊合压力、应变和应变速率均有利于型材焊缝及其界面的焊合。在挤压过程中，铝基体的流动受到纤维的影响，同时也对纤维的嵌入位置和受力状态产生一定影响。

The extrusion mold of continuous fiber-reinforced aluminum-based composite bar was designed, and the 2D numerical simulation of the entire extrusion process was conducted based on of Deform-2D software. Then, the rheological laws of material and the distribution characteristics of each physical field on the welding path were studied during the extrusion process of composite profiles, and the aluminum-based composite bar reinforced by continuous steel wire was obtained by extrusion experiment. The results show that the stress concentration on the steel wire is caused by the triaxial compressive stress and the uneven flow of billet in the welding chamber. In the extrusion process of composite profile, the bonding between steel wire and aluminum matrix firstly depends on the welding pressure in the welding chamber, and its adhesion outside the port of mold depends mainly on the extrusion temperature. In the welding path, the higher extrusion temperature, welding pressure, strain and strain rate are beneficial to the welding of the profile weld and its interface. However, during the extrusion process, the flow of the aluminum matrix is affected by the fibers, and it also has a certain impact on the embedding position and the force state of the fibers.

基金项目：

国家自然科学基金资助项目（51975330）;山东省重大科技创新工程项目（2019JZZY010360）

刘明甫（1994-），男，博士研究生 E-mail：liumf@mail.sdu.edu.cn 通信作者：张存生（1980-），男，博士，教授 E-mail：zhangcs@sdu.edu.cn

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