Dynamic tensile constitutive relationship and failure behavior of 6061-T6 aluminum alloy

ZHOU Lun; SU Xingya; JING Lin; DENG Guide; ZHAO Longmao

doi:10.11883/bzycj-2022-0154

Volume 42 Issue 9

Sep. 2022

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ZhengYu-xuan, ZhouFeng-hua, HuShi-sheng. Effectsofperiodically-distributeddefectsonductilefragmentationprocessofmaterialsunderhighstrain-ratetension[J]. Explosion And Shock Waves, 2013, 33(2): 113-119. doi: 10.11883/1001-1455(2013)02-0113-07

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ZHOU Lun, SU Xingya, JING Lin, DENG Guide, ZHAO Longmao. Dynamic tensile constitutive relationship and failure behavior of 6061-T6 aluminum alloy[J]. Explosion And Shock Waves, 2022, 42(9): 091407. doi: 10.11883/bzycj-2022-0154

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Dynamic tensile constitutive relationship and failure behavior of 6061-T6 aluminum alloy

doi: 10.11883/bzycj-2022-0154

ZHOU Lun^{1, 2
,},
SU Xingya¹,
JING Lin^{1
,
,},
DENG Guide³,
ZHAO Longmao⁴

1.
State Key Laboratory of Traction Power, Southwest Jiaotong University, Chengdu 610031, Sichuan, China
2.
Sichuan Aviation Industry Chuanxi Machine Co. Ltd., Yaan 625000, Sichuan, China
3.
China Special Equipment Inspection and Research Institute, Beijing 100029, China
4.
Institute of Applied Mechanics, Taiyuan University of Technology, Taiyuan 030024, Shanxi, China

Received Date: 2022-04-08
Rev Recd Date: 2022-08-23

Available Online: 2022-09-05

Publish Date: 2022-09-29

Abstract

Abstract

The quasi-static and dynamic tensile mechanical properties of 6061-T6 aluminum alloy in a strain rate range from 0.001 s⁻¹ to 100 s⁻¹ were investigated by using a HMH-206 high-speed material testing machine. The stress-strain response characteristics and strain rate sensitivity of the 6061-T6 aluminum alloy were analyzed, and the effects of strain rate on the flow stress and strain rate sensitivity index were discussed. Based on the experimental results, the Johnson-Cook constitutive model was modified to describe the plastic flow characteristics of the 6061-T6 aluminum alloy under dynamic tensile loading. In addition, the relationship between the fracture strain and stress triaxiality of the notched specimens was established by experiments and simulations, and the values of the parameters in the Johnson-Cook failure model were obtained according to the experimental and simulation results. The results show that the 6061-T6 aluminum alloy exhibits obvious strain hardening characteristics and strain rate strengthening effects, and the flow stress increases with the increase of true strain and strain rate. The strain rate sensitivity index of the material is affected by the coupling effect of strain and strain rate. During the tensile process, the Mises stress of the notched specimens was symmetrically distributed about the minimum cross-section, and the stress triaxiality at the minimum cross-section was symmetrically distributed about the center line along the width and thickness directions. Furthermore, the fracture strain of the material decreases gradually with the increase of the stress triaxiality, and increases approximately linearly with the increasing dimensionless logarithmic strain rate. The plastic flow characteristics of the 6061-T6 aluminum alloy can be described by the modified Johnson-Cook constitutive model, and the parameters in the Johnson-Cook failure model of the material can be obtained by the experiments and simulations on the notched specimens. The verification results indicate that the established models can predict the tensile mechanical response and fracture failure behavior of the 6061-T6 aluminum alloy under a complex stress state.
- 6061-T6 aluminum alloy,
- dynamic mechanical property,
- strain rate sensitivity,
- Johnson-Cook constitutive model,
- failure parameter

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References

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