Dynamic deformation behavior of aluminum alloys under high strain rate compressive/tensile loading

Lee, Ouk Sub; Kim, Guan Hee; Kim, Myun Soo; Hwang, Jun Seong

doi:10.1007/bf02983392

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Thus, the following require close monitoring: (1) the thermal gradient occurring in the end parts of the pressure bars may change the Young's modulus. (2) This may result in a change in the mechanical impedance. (3) This may subsequently alter the configuration of reflected and transmitted waves.…”

Section: Temperature Measuring Of Specimenmentioning

confidence: 99%

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High-temperature dynamic deformation of aluminum alloys using SHPB

2011

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This paper investigates the dynamic deformation behavior of two aluminum alloys, 2024-T4 and 6061-T6, using a modified split Hopkinson pressure bar (SHPB) with a pulse shaper technique at both elevated and room temperatures. An experimental strategy is proposed, and the dynamic deformation behaviors of two alloys are evaluated with the modified high-temperature SHPB apparatus. The experiments were carried out under varying strain rates and temperatures. The reflected waves modulated by the pulse shaper, the flow stressstrain relationships, the strain rates, the front-and back-ends stresses during the dynamic deformation period were measured at varying high temperatures. Experimentally obtained data were used to evaluate the parameters in the material constitutive equation, such as the Johnson-Cook (JC) constitutive model.

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Section: Temperature Measuring Of Specimenmentioning

confidence: 99%

“…The split Hopkinson pressure bar (SHPB) technique has been widely used to determine the mechanical properties of varying materials deformed under highstrain-rate conditions. This experimental technique measures the impact deformation response of varying materials for strain rates ranging from 10 2 s -1 to 10 4 s -1 [2].…”

Section: Introductionmentioning

confidence: 99%

High-temperature dynamic deformation of aluminum alloys using SHPB

2011

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“…They fixed a specimen on the incident and transmit bars using bolts. Lee et al [7] also measured the tensile flow stress of a round bar.…”

Section: Introductionmentioning

confidence: 99%

A Numerical Investigation into the Tensile Split Hopkinson Pressure Bars Test for Sheet Metals

Nam

Choi

Kim

2013

AMM

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Determination of theflow stress of materials at high strain rate is very important in automotive and military areas.The compressive flow stress at high strain rate can be obtained relativelyexactly by SHPB(Split Hopkinson Pressure Bars) tests. However, it is difficult to determinethe flow stressexactlyin the tensile state by using the SHPB tests. The difficulty in the tensile SHPB tests is how to fix a specimen on two bars. So, the design of a specimen and holders is needed to obtain more accurate measurement of the flow stress. In this study, the accuracy of the tensile SHPB tests results was numerically investigated. Finite element analyses of the tensile SHPB were carried out for various cases of fixing bolt location and bolting force. From the analysis results, a design guide for the fixing structure was obtained and the causes of error were investigated.

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Dynamic Tensile Deformation of High Strength Aluminum Alloys Processed Following Novel Thermomechanical Treatment Strategies

et al. 2020

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Herein, the effects of a very recently introduced novel thermomechanical process route on the microstructural evolution and dynamic tensile deformation behavior of two different precipitation hardenable aluminum alloys, i.e., AA6082 and AA7075, are studied. The investigated materials are hot formed and quenched in differently tempered tools to reveal the influence of cooling rate. Microstructure analysis is conducted to study the influences of different cooling strategies on the microstructure evolution and prevailing strengthening mechanisms in the investigated conditions. Dynamic tensile tests at strain rates of 40, 200, and 400 s−1 coupled with digital image correlation are further conducted to study the mechanical performance and the local deformation behavior. Experimental results show a decrease in yield and tensile strength for the material quenched at higher tool temperature. With increasing strain rate, strength and elongation to failure of the investigated alloys increase for all conditions. The obtained mechanical properties can be rationalized based on the prevailing microstructural features. Both alloys show fine and well‐distributed precipitates upon fast quenching, whereas coarse precipitates prevail upon slow cooling.

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Dynamic deformation behavior of aluminum alloys under high strain rate compressive/tensile loading

Cited by 5 publications

References 9 publications

High-temperature dynamic deformation of aluminum alloys using SHPB

High-temperature dynamic deformation of aluminum alloys using SHPB

A Numerical Investigation into the Tensile Split Hopkinson Pressure Bars Test for Sheet Metals

Dynamic Tensile Deformation of High Strength Aluminum Alloys Processed Following Novel Thermomechanical Treatment Strategies

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