A gas-gun facility for material impact studies using low-velocity, low-mass projectiles

Brown, James R.; Chappell, P. J. C.; Egglestone, G. T.; Gellert, E. P.

doi:10.1088/0022-3735/22/9/016

Cited by 17 publications

(6 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The transverse ballistic impact properties were determined using the Materials Research Laboratory gasgun facility [23] and 17 grain fragment-simulating projectiles [24]. The Vso data (projectile velocity at which the probability of target penetration is 50%) were determined according to the procedures of MIL-STD-662 E [25].…”

Section: Ballistic Impact Propertiesmentioning

confidence: 90%

Plasma surface modification of advanced organic fibres

Brown¹,

Chappell²,

Mathys³

1991

J Mater Sci

View full text Add to dashboard Cite

A marked improvement in the interlaminar shear strength and flexural strength of aramid/ epoxy composites is observed when the fibres are pretreated in an ammonia or ammonia/ nitrogen gaseous discharge (plasma) to introduce amine groups on to the fibre surface. Scanning electron and optical microscopic observations are used to examine the microscopic basis for these results. Scanning electron micrographs of shear fracture surfaces show clean fibre/matrix separation in composites made from untreated fibres, indicative of weak interfacial bonding. In contrast, shear fracture surfaces of composites containing plasma-treated fibres exhibit clear evidence of fibre fibrillation and matrix cracking, suggesting stronger interfacial bonding. Optical microscopic examination of flexure specimens shows that enhanced strength results mainly from reduced compressive fibre buckling and debonding, due to an increase in fibre/matrix interfacial bond strength. This increase is not accompanied by any significant change in the interlaminar fracture energy or flexural modulus of the composites, but there is an appreciable loss in transverse ballistic impact properties. These results are also examined in terms of the observed increase in fibre/matrix interfacial strength.

show abstract

Section: Ballistic Impact Propertiesmentioning

confidence: 90%

Plasma surface modification of advanced organic fibres

Brown¹,

Chappell²,

Mathys³

1991

J Mater Sci

View full text Add to dashboard Cite

show abstract

“…Three tests were conducted for each condition. The muzzle velocity ( u m ) of the projectiles was not experimentally measured; however, it was estimated using the following expression 29 where p is the gas pressure, L is the length of the barrel, m is the mass of the projectile and A is the cross-sectional area of the barrel. The calculated muzzle velocity of the projectiles was 100, 150 and 190 m/s for 3, 6 and 10 bars, respectively.…”

Section: Methodsmentioning

confidence: 99%

Effect of strain rate, off-axis loading and high-velocity impact damage on the compressive strength of C/SiC composite

Altaf

Singh

Prasad

et al. 2018

Journal of Composite Materials

View full text Add to dashboard Cite

The compressive strength of C/SiC composite at different strain rates, off-axis orientations and after high-velocity impact was studied. The compressive strength was found to be 137 ± 23, 130 ± 46 and 162 ± 33 MPa at a strain rate of 3.3 × 10−5, 3.3 × 10−3, 3.3 × 10−3 s−1, respectively. On the other hand, the compressive strength was found to be 130 ± 46, 99 ± 23 and 87 ± 9 MPa for 0°/90°, 30°/60° and 45°/45° fibre orientations to loading direction, respectively. After high-velocity impact, the residual compressive strength of C/SiC composite was found to be 58 ± 26, 44 ± 18 and 36 ± 3.5 MPa after impact with 100, 150 and 190 m/s, respectively. The formation of kink bands in fibre bundles was found to be dominant micro-mechanism for compressive failure of C/SiC composite for 0°/90° orientation. On the other hand, delamination and the fibre bundles rotation were found to be the dominant mechanism for off-axis failure of composite.

show abstract

“…There are three air gun mechanisms available for pyroshock testing: a solenoid valve breech [35,36], a burst diaphragm breech [37][38][39], and a wrap-around breech [38][39][40][41]. Among these mechanisms, we considered the wraparound breech mechanism as the best candidate due to its rapid breech opening and robustness to shockwave.…”

Section: Launchermentioning

confidence: 99%

“…The design variables of the wrap-around breech are shown in Figure 18 and can be determined using the Seigel's PPIG gun model [27]. This model has been used by many researchers [35,37,38, 54] and is a well-developed gas gun model. This model was derived assuming the breech length is infinite: the breech length Br should be long enough to be effectively infinite and the amount of gas should be sufficient.…”

Section: Wrap-around Breech Airmentioning

confidence: 99%

Development of a Point Pyroshock Source Simulator

Jeong

Lim

Kim

et al. 2017

Shock and Vibration

View full text Add to dashboard Cite

We developed a point pyroshock source simulator (PPSS) for the study on the source isolation approach (SIA) in this study. In spite of the potentiality of the SIA for avionics protection against pyroshock, it has rarely been investigated due to lack of pyroshock source simulators. To overcome such a situation, we proposed the PPSS using a mechanically excited tuned resonator simulating a release device itself. The PPSS was designed using explicit finite element analysis and Seigel’s gas gun model. To verify the proposed PPSS, the prototype was fabricated and tested. From the results, we have shown that the prototype of the PPSS simulates a near-field pyroshock and is able to evaluate the SIA.

show abstract

A gas-gun facility for material impact studies using low-velocity, low-mass projectiles

Cited by 17 publications

References 3 publications

Plasma surface modification of advanced organic fibres

Plasma surface modification of advanced organic fibres

Effect of strain rate, off-axis loading and high-velocity impact damage on the compressive strength of C/SiC composite

Development of a Point Pyroshock Source Simulator

Contact Info

Product

Resources

About