The Spall Strength Measurement and Modelling of AQ80 Iron and Copper Systems

Church, P.; Proud, W. G.; Andrews, T.; Goldthorpe, B.D.

doi:10.1063/1.1483583

Cited by 3 publications

(3 citation statements)

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“…2003), this observation agreeing with previous work (Murray 1996). However, analysis of the data found in Church et al . (2001) shows that AQ80 steel, a very soft ductile material, has a spall strength which, within experimental error, does not vary with longitudinal stress at the stresses considered.…”

Section: Discussionmentioning

confidence: 97%

Does the pressure‐induced a ‐ e phase transition occur for all low–alloy steels?

Hammond

Proud

2004

Proc. R. Soc. Lond. A

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When designing many products, especially vehicles, it is important to take into consideration impact properties. This paper presents fundamental dynamic data for two examples of bainitic steels. Hugoniots and shear-strength variation with longitudinal stress is reported. These were similar for both materials and in agreement with values for mild steel. The ferrite in the lower-temperature bainite was found to undergo a shock-induced phase transition at 13 GPa, whereas no phase transition was observed in the upper bainite. Further research is being conducted to account for this difference by studying the microstructure and the effect of impact on it. The lower-temperature bainite was found to behave in a brittle fashion, fragmenting extremely, whereas upper bainitic samples were usually recovered intact indicating ductile behaviour. The dynamic tensile or spall strength was also measured in these materials over a range of impact conditions. For the upper bainite, the spall strength dropped slightly with increasing longitudinal stress. However, for the lower-temperature bainite, there was a significant drop in spall strength above the longitudinal stress at which the phase transition occurs. Microstructural studies were also undertaken.

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Section: Discussionmentioning

confidence: 97%

Does the pressure‐induced a ‐ e phase transition occur for all low–alloy steels?

Hammond

Proud

2004

Proc. R. Soc. Lond. A

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“…The variation in value as a function of the initial shock input [267] and the incipient formation of the spall plane [268] have been studied. Modelling of such systems is non-trivial and requires the successful integration of several steps; the passage of shock waves through an uncompressed material, the dispersion of the release waves (the so-called 'release fans'), the interaction of the releases and the fracture limit [269][270][271][272][273][274][275][276][277][278][279].…”

Section: Combined Experiments and Modelling Of Metallic Systemsmentioning

confidence: 99%

Review of experimental techniques for high rate deformation and shock studies

Field¹,

Walley²,

Proud³

et al. 2004

International Journal of Impact Engineering

653

296

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“…The value derived for the Al-6082-T6 and used for the calculations in this study was S c = 0.75. Although the parameters for the fracture model are determined from quasi-static data, validation of the model has been performed using plate impact data involving strain rates of ∼10 7 s −1 (Church et al, 2002). In preliminary calculations it was determined that the mode of failure was dominated by the tensile component, and as a result, simulations in this study were performed with A ≡ 0.…”

Section: The Fracture Modelmentioning

confidence: 99%

Shock induced void nucleation during Taylor impact

et al. 2005

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Taylor impact experiments in the classic and symmetric configurations were used to study the plastic deformation and void nucleation in Al-6082-T6 rods. Deformation histories during impact were recorded using high-speed photography. X-ray computed tomography was used to visualize the extent of damage in recovered specimens. Above threshold velocities, void nucleation was observed along the central axis of the specimens, and reconstructed images from the tomography provide a 3-D mapping of the damaged region. The use of X-ray tomography is the first step in developing a method to characterise the damage process during impact using in-situ flash X-rays, which is also attempted in this study. Finite element simulations of these experiments are in good agreement with the experimental measurements, and confirm that void nucleation is due to the coalescence of lateral release waves at the centre of the specimen. The simulations also revealed that the time to failure is velocity dependent, and that the threshold velocity for void nucleation is sensitive to the properties and geometry of the target.

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The Spall Strength Measurement and Modelling of AQ80 Iron and Copper Systems

Cited by 3 publications

References 0 publications

Does the pressure‐induced a ‐ e phase transition occur for all low–alloy steels?

Does the pressure‐induced a ‐ e phase transition occur for all low–alloy steels?

Review of experimental techniques for high rate deformation and shock studies

Shock induced void nucleation during Taylor impact

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