温热成形对AA5754铝合金静态力学性能的影响

doi:10.13229/j.cnki.jdxbgxb20200180

吉林大学学报(工学版) ›› 2021, Vol. 51 ›› Issue (3): 847-854.doi: 10.13229/j.cnki.jdxbgxb20200180

温热成形对AA5754铝合金静态力学性能的影响

庄蔚敏¹(),王鹏跃¹,高瑞娟²,解东旋³

^1.吉林大学汽车仿真与控制国家重点实验室，长春 130022
^2.太原学院机电工程系，太原 030032
^3.一汽-大众汽车有限公司，长春 130011

收稿日期:2020-02-18 出版日期:2021-05-01 发布日期:2021-05-07
作者简介:庄蔚敏(1970-)，女，教授，博士生导师. 研究方向：车身结构设计与优化，有限元分析和金属成型技术.E-mail:zhuangwm@jlu.edu.cn
基金资助:
国家自然科学基金项目(51775227)

Effect of hot forming on static mechanical properties of AA5754 aluminum alloy

Wei-min ZHUANG¹(),Peng-yue WANG¹,Rui-juan GAO²,Dong-xuan XIE³

^1.State Key Laboratory of Automotive Simulation and Control，Jilin University，Changchun 130022，China
^2.Department of Mechanical and Electrical Engineering，Taiyuan University，Taiyuan 030032，China
^3.FAW-Volkswagen Automotive Co. ，Ltd. ，Changchun 130011，China

Received:2020-02-18 Online:2021-05-01 Published:2021-05-07

摘要/Abstract

摘要：

通过高温预拉伸试验和室温拉伸试验分析了温热预变形对AA5754铝合金失效应变、抗拉强度、屈服强度的影响规律。建立了损伤耦合预变形本构模型，以表征不同预应变材料的静态力学性能。以车门防撞梁为例，应用该本构模型分析了热冲压过程中的预变形和厚度变化对其弯曲性能的影响。结果表明：温热预变形会直接降低AA5754铝合金的静态力学性能；300 ℃下0.7的应变比率使试样的失效应变和抗拉强度分别减少了62%和16%；本文所建立的本构模型可以准确地预测温热成形对AA5754铝合金静态力学性能的影响。

关键词: 车辆工程：AA5754铝合金, 车门防撞梁, 温热成形, 本构模型

Abstract:

The effects of thermal deformation on the failure strain， ultimate stress， and yield stress of AA5754 aluminum alloy are analyzed by high temperature pre-tension test and room temperature tensile test. A damage coupling pre-forming constitutive model is established to characterize the relationship between forming strain and service performance. This constitutive model is used to analyze the effects of forming damage and thickness change on the bending performance of side-door impact beam. The results show that forming damage directly reduces the service performance of AA5754 aluminum alloy. When the forming strain is 0.7 at 300 ℃， the failure strain and ultimate stress are reduced by 62% and 16%， respectively. The proposed constitutive model can accurately predict the effect of hot forming on the static mechanical properties of AA5754 aluminum alloy.

Key words: vehicle engineering, AA5754 aluminum alloy, side-door impact beam, hot forming, constitutive model

中图分类号:

U463.82

庄蔚敏,王鹏跃,高瑞娟,解东旋. 温热成形对AA5754铝合金静态力学性能的影响[J]. 吉林大学学报(工学版), 2021, 51(3): 847-854.

Wei-min ZHUANG,Peng-yue WANG,Rui-juan GAO,Dong-xuan XIE. Effect of hot forming on static mechanical properties of AA5754 aluminum alloy[J]. Journal of Jilin University(Engineering and Technology Edition), 2021, 51(3): 847-854.

图/表 20

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表3

损伤耦合预变形的本构材料常数"

材料常数	数值	材料常数	数值
$K 0$	71.904	$η$	17.9862
$k 0$	43.53	$Δ 0$	0.25
$n$	1.8	$Δ 1$	0.013
$B$	389.3	$Δ 2$	1.3135
$ξ 0$	2.3095	$E$	7.055×10⁴
$ξ 1$	0.9238

表3

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参考文献 11

1	Zheng K L, Dong Y C, Zheng J H, et al. The effect of hot form quench (HFQ) conditions on precipitation and mechanical properties of aluminium alloys[J]. Materials Science and Engineering A, 2019, 761:138017.
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8	Zhuang Wei-min, Wang Peng-yue, Xie Dong-xuan, et al. Experimental study and a damage model approach to determine the effect of hot forming deformation on the service performance of 22MnB5 steel[J]. Journal of Manufacturing Processes, 2019,47: 10-21.
9	Na J, Mu W, Qin G, et al. Effect of temperature on the mechanical properties of adhesively bonded basalt FRP-aluminum alloy joints in the automotive industry[J]. International Journal of Adhesion and Adhesives, 2018, 85:138-148.
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11	Lin J, Mohamed M, Balint D, et al. The development of continuum damage mechanics-based theories for predicting forming limit diagrams for hot stamping applications[J]. International Journal of Damage Mechanics, 2014, 23(5):684-701.

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温度 /°C	参数				失效
温度 /°C	参数	0.3	0.5	0.7	失效
300	应变量/mm	0.153	0.254	0.356	0.509
300	拉伸量/mm	1.833	3.220	4.755	7.372
400	应变量/mm	0.181	0.303	0.424	0.606
400	拉伸量/mm	2.216	3.934	5.873	9.260

应变比率	温度/℃
应变比率	300	400
0.0	29.82	29.80
0.3	27.04	24.82
0.5	24.78	21.37
0.7	21.83	17.78

	模型A	模型B	模型C
最大载荷/N	2984	2830	2713
失效位移/mm	164	150	138

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温热成形对AA5754铝合金静态力学性能的影响

Effect of hot forming on static mechanical properties of AA5754 aluminum alloy

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