Measurement of dynamic large-strain deformation maps using an automated fine grid technique

Rae, Philip; Goldrein, H. T.; Bourne, N. K.; Proud, W. G.; Forde, L.C.; Liljekvist, M

doi:10.1016/s0143-8166(99)00003-2

Cited by 20 publications

(11 citation statements)

References 10 publications

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“…So in the studies summarised here tungsten alloy rods were impacted by RHA plates in a reverse ballistic impact geometry. The data gathered from instrumented rods can be used to validate models used in ballistics codes [282,[286][287][288][289][290]. Previous work performed in our laboratory concentrated on rod/ plate interaction at fixed angles of 45 or 60 [291].…”

Section: Reverse Ballistics Studiesmentioning

confidence: 99%

Review of experimental techniques for high rate deformation and shock studies

Field¹,

Walley²,

Proud³

et al. 2004

International Journal of Impact Engineering

663

296

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Section: Reverse Ballistics Studiesmentioning

confidence: 99%

Review of experimental techniques for high rate deformation and shock studies

Field¹,

Walley²,

Proud³

et al. 2004

International Journal of Impact Engineering

663

296

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“…The third technique used in this impact study of borosilicate glass was the observation of the rear surface during penetration using the fine grid technique described in an earlier paper [41] . Figure 6 presents a high-speed photographic sequence, lasting 16.5 s, of the 532 m s -1 impact of a round-nosed mild steel rod onto a 9.5mm thick borosilicate glass block.…”

mentioning

confidence: 99%

Ballistic impact studies of a borosilicate glass

Forde

Proud

Walley

et al. 2010

International Journal of Impact Engineering

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The ballistic impact properties of a borosilicate ('pyrex') glass was studied using mild steel rods accelerated using a light gas gun. High-speed photography at sub-microsecond framing rates was used along with schlieren optics to investigate the propagation of elastic shock waves and fracture fronts. Flash X-radiography was used to visualize the deformation of rods as they penetrated the comminuted glass normally. The rod was seen initially to dwell on the surface for at least 3 s creating a Hertzian cone-crack. Later on, between 40 and 60 s, self-sharpening of the projectile was observed as the 'wings' of the heavily deformed front end sheared off. After this event, the front of the rod speeded up.X-rays also showed that the pattern of fissures within the comminuted glass was observed to be very similar shot-to-shot. X-radiography was also used to examine the mechanisms occurring during oblique impact of rods at 45˚. In oblique impact, bending of the rod rather than plastic deformation ('mushrooming') takes on the role of distributing the load over an area larger than that of the original rod diameter. High-speed photography of the rear surface of a glass block on which a fine grid had been placed confirmed that the comminuted glass moved as larger interlocked blocks. The experiments were modelled using the QinetiQ Eulerian hydrocode GRIM making use of the Goldthorpe fracture model. The model was found to predict well the transition from dwell to penetration.

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“…In order that this can be converted to displacement in mm in the object plane, an appropriate scaling factor (mm / pixels) must be applied. This was determined by taking a radiograph of a grid of known pitch placed in the same plane as the specimen speckle pattern [54,58,59] and then performing a 2D…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

“…It is necessary to do a 2D Fourier transform since any rotation of the grid with respect to the spectral axes will result in the resolved components on each axis being a different frequency to the true grid pitch. The image is then inverse Fourier transformed and the phase is calculated and unwrapped [58,59] . The phase plane gradient gives the grid periodicity in pixels from which an accurate scale-factor for the imaged speckle pattern can be determined.…”

Section: A C C E P T E D Accepted Manuscriptmentioning

confidence: 99%

The use of digital speckle radiography to study the ballistic deformation of a polymer bonded sugar (an explosive simulant)

Prentice

Proud

Walley

et al. 2010

International Journal of Impact Engineering

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This paper reports an initial study into the benefits of determining two-dimensional flow fields for low velocity impact on a small-scale model of explosive reactive armour (ERA) using digital speckle radiography (DSR). The model system consisted of a polymer-bonded sugar (PBS) (otherwise known as a sugarmock) confined between two mild steel plates. The DSR technique relies upon creating a layer within the specimen that is seeded with lead particles. So although radiography itself is mechanically non-invasive, the lead layer needed may change the mechanical properties of the material. DSR revealed where regions of intense shear occurred in normal impact. These regions are likely to be where a polymer-bonded explosive (PBX) would initiate.

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Measurement of dynamic large-strain deformation maps using an automated fine grid technique

Cited by 20 publications

References 10 publications

Review of experimental techniques for high rate deformation and shock studies

Review of experimental techniques for high rate deformation and shock studies

Ballistic impact studies of a borosilicate glass

The use of digital speckle radiography to study the ballistic deformation of a polymer bonded sugar (an explosive simulant)

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