Spall Strength and Failure Waves in Glass

Brar, N. S.; Rosenberg, Z.; Bless, Stephan

doi:10.1051/jp4:1991389

Cited by 29 publications

(33 citation statements)

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“…Plate impact experiments [7,13,28] give clear evidence that this material exhibits a finite shear strength for some time after the initial impact although the spall strength is zero [29][30][31] .…”

Section: Figure 2 Near Herementioning

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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Section: Figure 2 Near Herementioning

confidence: 99%

Ballistic impact studies of a borosilicate glass

Forde

Proud

Walley

et al. 2010

International Journal of Impact Engineering

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“…Investigations performed during the last years-especially with glasses like soda-lime glass (float glass), borosilicate glasses, and high-density glasses with high PbO content (DEDF glasses)-have contributed to a better understanding of the fracture characteristics and the failure propagation phenomenon. Planar-impact tests, and classic and symmetric Taylor tests, in combination with highspeed camera pictures reveal the following features of the failed zone [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]: (1) an anomalous recompression in the free surface velocity record, caused by the interaction of the released wave with the front of the failed zone, e.g. Refs.…”

Section: Introductionmentioning

confidence: 99%

Penetration and failure of lead and borosilicate glass against rod impact

Behner

Anderson

Orphal

et al. 2008

International Journal of Impact Engineering

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“…Only a minimum spall strength has been inferred from tests that were not successful in spalling the glass. Brar [2] was not able to spall the glass with stresses of up to 5 GPa. Kanel [3] tested the glass at 6.8 GPa and did not see a spall either.…”

Section: Introductionmentioning

confidence: 91%

Experimental and computed results investigating time-dependent failure in a borosilicate glass

Chocron¹,

Barnette²,

Holmquist³

et al. 2017

AIP Conference Proceedings

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Abstract. Symmetric plate-impact tests of borosilicate glass were performed from low (116 m/s) to higher (351 m/s) velocities. The tests were recorded with an ultra-high-speed camera to see the shock and failure propagation. The velocity of the back of the target was also recorded with a PDV (Photon Doppler Velocimeter). The images show failure nucleation sites that trail the shock wave. Interestingly, even though the failure wave is clearly seen, the PDV never detected the expected recompression wave. The reason might be that at these low impact velocities the recompression wave is too small to be seen and is lost in the noise. This work also presents a new way to interpret the signals from the PDV. By letting part of the signal travel through the target and reflect on the impact side, it is possible to see the PDV decrease in intensity with time, probably due to the damage growth behind the shock wave.

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Spall Strength and Failure Waves in Glass

Cited by 29 publications

References 0 publications

Ballistic impact studies of a borosilicate glass

Ballistic impact studies of a borosilicate glass

Penetration and failure of lead and borosilicate glass against rod impact

Experimental and computed results investigating time-dependent failure in a borosilicate glass

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