Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第25卷    第7期    总第196期    2015年7月

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文章编号:1004-0609(2015)-07-1790-08
内外压复合作用下5A02铝合金管材的硬化行为
崔晓磊1,王小松1, 2,苑世剑1, 2

(1. 哈尔滨工业大学 金属精密热加工国家级重点实验室,哈尔滨 150001;
2. 哈尔滨工业大学 材料科学与工程学院,哈尔滨 150001
)

摘 要: 为了研究管材在内外压复合作用下的硬化行为,在中间自由胀形区为椭圆形轮廓线的假设条件下,理论推导得到内外压复合作用下管材的应力/应变分析模型;再利用薄壁5A02-O铝合金管材在研制的内外压复合成形实验装置上进行外压为85 MPa(1.0σs)的实验研究,得到5A02铝合金管材在内外压复合作用下的应力-应变曲线。结果表明:5A02铝合金管材在内外压复合作用下进行胀形时,其胀形区轮廓形状依然可以准确地用椭圆函数进行拟合,且最高点处壁厚与胀形高度符合线性关系;由内外压复合胀形得到的应力-应变曲线的硬化指数n值为0.274,低于单向拉伸时得到的n值(0.304)。

 

关键字: 铝合金管材;复合作用;胀形;硬化行为;三维应力状态

Hardening behavior of 5A02 aluminum alloy tube under combined action of internal and external pressures
CUI Xiao-lei1, WANG Xiao-song1, 2, YUAN Shi-jian1, 2

1. National Key Laboratory of Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China;
2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China

Abstract:In order to investigate the hardening behavior of tubes under the combined action of internal and external pressures, the analytical models of stress and strain for the tubes bulged under the combined action of internal and external pressures were deduced firstly based on the assumption that the free bulging zone can be fitted perfectly using the elliptic equation. Moreover, an experimental investigation was conducted that the thin-walled 5A02-O aluminum alloy tubes were bulged under double-sided pressures using self-developed double-sided tube hydroforming equipment at the same external pressure of 85 MPa(1.0σs). Then, the stress-strain curve of 5A02 aluminum alloy tube under double-sided pressures was obtained. The results show that the free bulging area of 5A02 aluminum alloy tubes can be fitted perfectly using the elliptic equation. The thickness at the highest point (P) has a linear relation with the bulging height. In addition, the strain hardening exponent n obtained from double-sided free bulging (0.274) is lower than that obtained from uniaxial tension (0.304).

 

Key words: aluminum alloy tube; combined action; bulging; hardening behavior; three-dimensional stress state

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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