Compression-impact testing of aluminum at elevated temperatures

Chiddister, J. L.; Malvern, L. E.

doi:10.1007/bf02325890

Cited by 121 publications

(47 citation statements)

References 4 publications

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“…The resulting temperature gradients induced along the lengths of the two pressure bars affect both the elastic modulus of the bars and the propagation velocity of the incident, reflected and transmitted pressure pulses. Accordingly, the original equations used to compute the strain, strain rate and stress in the deformed specimens 3) were modified to the forms shown by Chiddister and Malvern in 15) and the current authors in.…”

Section: Methodsmentioning

confidence: 99%

Dynamic Impact Response of Inconel 718 Alloy under Low and High Temperatures

Lee

Lin

Chen³

et al. 2011

Mater. Trans.

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Dynamic impact response of Inconel 718 alloy is studied at temperatures ranging from À150 to 550 C and strain rates in the range of 1000 to 5000 s À1 using a compressive split Hopkinson pressure bar. It is found that the flow stress increases with increasing strain rate, but decreases with increasing temperature. The highest work hardening rate is observed in the specimen at the lowest temperature (À150 C) and the highest strain rate (5000 s À1 ). However, the work hardening rate is weakened by the deformation-induced temperature rise under high strain and strain rate conditions. The strain rate sensitivity increases with increasing strain rate, but decreases with increasing temperature. The activation energy varies as a function of the strain rate and temperature, and has a maximum value of 40 kJ/mol. The greatest thermal softening effect occurs at the highest strain rate of 5000 s À1 and temperatures in the range À150$25 C. The microstructural observations confirm that the mechanical response of the Inconel 718 specimens is directly related to the effects of the strain rate and temperature on the evolution of the impacted microstructure.

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Section: Methodsmentioning

confidence: 99%

Dynamic Impact Response of Inconel 718 Alloy under Low and High Temperatures

Lee

Lin

Chen³

et al. 2011

Mater. Trans.

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“…The current high temperature impact testing technique and the modified stress and strain calculations are fully documented by Chiddister and Malvern in Ref. 23) and by the current group in Ref. 24).…”

Section: Methodsmentioning

confidence: 99%

Effects of Strain Rate and Temperature on the Deformation and Fracture Behaviour of Titanium Alloy

2007

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The deformation response and fracture behaviour of Ti alloy under strain rates of 8 Â 10 2 s À1 to 8 Â 10 3 s À1 at temperatures ranging from 25 C to 900 C are studied using split-Hopkinson pressure bar. The mechanical properties and fracture features of the alloy are found to be significantly dependent on both the strain rate and the temperature. At a constant temperature, the flow stress increases with increasing strain rate. However, at a given strain rate, the flow stress reduces as the temperature increases. Furthermore, the fracture strain decreases with increasing temperature prior to phase transformation at 785 C, but increases thereafter as the temperature is further increased. As the strain rate increases, the strain rate sensitivity increases, but the activation volume decreases. However, as the temperature increases, the strain rate sensitivity decreases and the activation volume increases. Optical microscopy (OM) and scanning electron microscopy (SEM) observations reveal that the alloy specimens fracture primarily as the result of the formation of adiabatic shear bands. The fracture surfaces of the impacted specimens exhibit both dimple-like and cleavage-like features. The density of the dimples reflects the toughness of the alloy specimen and is found to vary directly as a function of the strain rate and the temperature.

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“…Later papers in that volume included a photothermoelastic analysis of bonded propellant grains [10], a review of shock motions and their measurement [11], eccentric longitudinal impact of a beam [12], and photoelastic studies of propagating stress waves [13]. There have been several publications in EM over the past 75 years studying the effect of strain-rate on material response, often bridging multiple loading techniques, such as [14][15][16][17][18]. Building on the society's history in photoelastic coatings and full field methods there have been expansive studies into dynamic fracture mechanics, such as [19][20][21][22][23][24][25].…”

Section: Members Of the Photoelasticity Conference And Guestsmentioning

confidence: 99%

Celebrating 75 Years of the Society for Experimental Mechanics and the Study of Dynamic Behavior of Materials

Brown

2018

J. dynamic behavior mater.

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Compression-impact testing of aluminum at elevated temperatures

Cited by 121 publications

References 4 publications

Dynamic Impact Response of Inconel 718 Alloy under Low and High Temperatures

Dynamic Impact Response of Inconel 718 Alloy under Low and High Temperatures

Effects of Strain Rate and Temperature on the Deformation and Fracture Behaviour of Titanium Alloy

Celebrating 75 Years of the Society for Experimental Mechanics and the Study of Dynamic Behavior of Materials

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