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| 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 |
| Received:April 21, 2021 |
| 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) |
| Author Name | Affiliation | | ZHENG Yue | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | DENG Hua-kun | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | YANG Shuai-shuai | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | CUI Jun-jia | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China | | LI Guang-yao | State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China |
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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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