文章摘要
郑月,邓桦坤,杨帅帅,等.AA5182铝合金两步高速拉伸的试样设计及其性能研究[J].精密成形工程,2021,13(4):23-28.
ZHENG Yue,DENG Hua-kun,YANG Shuai-shuai,et al.Two-Step High Speed Tensile Method Design of AA5182 and Research on Its Tensile Property[J].Journal of Netshape Forming Engineering,2021,13(4):23-28.
AA5182铝合金两步高速拉伸的试样设计及其性能研究
Two-Step High Speed Tensile Method Design of AA5182 and Research on Its Tensile Property
投稿时间:2021-04-21  
DOI:10.3969/j.issn.1674-6457.2021.04.004
中文关键词: 铝合金  高速拉伸  多步成形  断裂应变
英文关键词: aluminum alloy  high speed stretching  multi-step forming  fracture strain
基金项目:国家自然科学基金(51975202)
作者单位
郑月 湖南大学 汽车车身先进设计制造国家重点实验室长沙 410082 
邓桦坤 湖南大学 汽车车身先进设计制造国家重点实验室长沙 410082 
杨帅帅 湖南大学 汽车车身先进设计制造国家重点实验室长沙 410082 
崔俊佳 湖南大学 汽车车身先进设计制造国家重点实验室长沙 410082 
李光耀 湖南大学 汽车车身先进设计制造国家重点实验室长沙 410082 
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中文摘要:
      目的 提高铝合金塑性成形性能,解决高速成形贴模缺陷。方法 设计一种两步高速拉伸试样,在液压式伺服高速拉伸机上开展2次拉伸实验,并采用非接触式光学测量技术(Digital image correlation,DIC)测量全场应变,利用数值模型确定拉伸速度,获得期望的预拉伸应变率和应变。将单次高速拉伸性能与2次不同应变率和预应变下的高速拉伸性能进行对比。结果 铝合金材料在2次高速拉伸下的性能明显好于单次拉伸,抗拉强度增加了10%,断裂应变增加了14.5%。结论 设计的试样能满足2次高速拉伸的要求,试样预拉伸区域的尺寸和拉伸速度会影响试样的预应变、预应变率以及最终的断裂应变。
英文摘要:
      This paper aims to improve the plasticity of aluminum alloy forming and to solve the defect of die fitting in high-speed forming. In this paper, two-step tensile experiments were carried out on a hydraulic servo high speed tensile machine with a designed two-step high-speed tensile specimen, and the filed strain was measured by digital image correlation (DIC) system with a high speed camera. The numerical model was used to guide the setting of tensile velocities in the experiment so as to obtain the desired strain rates and strains after pre-stretching. The tensile properties of the specimens were compared with those of the specimens under single high-speed tension and two steps of different strain rates and pre-strains. Conclusion could be made that the properties of aluminum alloy under two-step high speed stretching were better than that of single stretching. And the tensile strength increased by 10% and the fracture strain increased by 14.5%. The results showed that the designed specimen could meet the requirements of two-step stretching. The size and tensile speed of the specimen pre-tension area would affect the specimen pre-strain and pre-strain rate, as well as the final fracture strain.
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