Research Papers

The Precise Determination of the Johnson–Cook Material and Damage Model Parameters and Mechanical Properties of an Aluminum 7068-T651 Alloy

[+] Author and Article Information
B. Bal

Department of Mechanical Engineering,
Abdullah Gül University,
38080 Kayseri, Turkey
e-mail: burak.bal@agu.edu.tr

K. K. Karaveli

Department of Mechanical Engineering,
Abdullah Gül University,
38080 Kayseri, Turkey
e-mail: kaan.karaveli@agu.edu.tr

B. Cetin

FNSS Defense Systems Co., Inc.,
Golbasi, 06830 Ankara, Turkey
e-mail: cetin.baris@fnss.com.tr

B. Gumus

06370 Ankara, Turkey
e-mail: berkaygumus@aselsan.com.tr

1Corresponding author.

Contributed by the Materials Division of ASME for publication in the Journal of Engineering Materials and Technology. Manuscript received December 26, 2018; final manuscript received February 6, 2019; published online March 12, 2019. Assoc. Editor: Vikas Tomar.

J. Eng. Mater. Technol 141(4), 041001 (Mar 12, 2019) (10 pages) Paper No: MATS-18-1340; doi: 10.1115/1.4042870 History: Received December 26, 2018; Accepted February 11, 2019

Al 7068-T651 alloy is one of the recently developed materials used mostly in the defense industry due to its high strength, toughness, and low weight compared to steels. The aim of this study is to identify the Johnson–Cook (J–C) material model parameters, the accurate Johnson–Cook (J–C) damage parameters, D1, D2, and D3 of the Al 7068-T651 alloy for finite element analysis-based simulation techniques, together with other damage parameters, D4 and D5. In order to determine D1, D2, and D3, tensile tests were conducted on notched and smooth specimens at medium strain rate, 100 s−1, and tests were repeated seven times to ensure the consistency of the results both in the rolling direction and perpendicular to the rolling direction. To determine D4 and D5 further, tensile tests were conducted on specimens at high strain rate (102 s−1) and temperature (300 °C) by means of the Gleeble thermal–mechanical physical simulation system. The final areas of fractured specimens were calculated through optical microscopy. The effects of stress triaxiality factor, rolling direction, strain rate, and temperature on the mechanical properties of the Al 7068-T651 alloy were also investigated. Damage parameters were calculated via the Levenberg–Marquardt optimization method. From all the aforementioned experimental work, J–C material model parameters were determined. In this article, J–C damage model constants, based on maximum and minimum equivalent strain values, were also reported which can be utilized for the simulation of different applications.

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Fig. 1

(a) Specimen geometries of the smooth specimen and the notched specimen for tensile tests, (b) specimen geometry for Gleeble tests, and (c) specimen geometry for SHPB tests (unit: mm)

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Fig. 2

Schematic representation of the custom-made split-Hopkinson pressure bar setup

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Fig. 3

Force versus displacement graphs of the Al 7068-T651 alloy (a) along the rolling direction and (b) perpendicular to the rolling direction. True stress–true strain behavior of the Al 7068-T651 alloy (c) along the rolling direction and (d) perpendicular to the rolling direction.

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Fig. 4

Comparison of the tensile behavior between the rolling direction and perpendicular to the rolling direction: (a) smooth specimens, (b) R0.4, (c) R0.8, and (d) R2

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Fig. 5

Equivalent plastic strain to fracture versus STF for the specimen in the rolling direction

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Fig. 6

Equivalent plastic strain to fracture versus STF for the specimen perpendicular to the rolling direction

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Fig. 7

True stress versus true strain response of Al 7068-T651 under SHPB loading

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Fig. 8

True stress versus true strain response of Al 7068-T651 from Gleeble tests

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Fig. 9

True stress versus true strain data of quasistatic tests

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Fig. 10

Determination of A, B, and n parameters of the J–C material model for Al 7068-T651

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Fig. 11

A representative shockwave generated by the SHPB test system

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Fig. 12

Determination of the offset stress at the 1800 s−1 case



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