The Composition Of Polymer Composite Fracture Surfaces As Studied By Xps

Wiegand, Donald A.; Pinto, J.

doi:10.1557/proc-409-281

Cited by 12 publications

(9 citation statements)

References 2 publications

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“…For the formulations PBX 9501 and EDC37, at quasi-static strain rates, at temperatures above Tg and unconfined, cracks initiate at and follow the interfaces between the crystal particles and the binder (Golderin, 1996;Rae, 2000;Rae et al, 2002a,b;Wiegand and Pinto, 1996). Slow crack propagation is then mainly along the interfaces because of the high particle volume fraction.…”

Section: Coulomb Friction Model For the Low Pressure Range (Range I)mentioning

confidence: 99%

Pressure and friction dependent mechanical strength – cracks and plastic flow

Wiegand¹,

Redingius²,

Ellis

et al. 2011

International Journal of Solids and Structures

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a b s t r a c tThe mechanical properties of a polymer composite plastic bonded explosive, EDC37, have been investigated as a function of hydrostatic confining pressure between 0.1 and 138 MPa. The results indicate different failure processes in two pressure ranges, a low pressure range between about 0.1 and 7 MPa and a higher pressure range between about 7 and 138 MPa. In the low pressure range slow crack processes are important in failure while in the higher pressure range plastic flow dominates. The pressure dependence of the compressive strength in the low pressure range is attributed to coulomb friction between surfaces of closed shear cracks and from the observed linear increase of the strength with pressure and the angle of the fracture plane a friction coefficient is obtained. Friction coefficients can also be obtained from the ratio of the compressive to tensile strength and directly from the above angle. The friction coefficients obtained from these separate observations are in agreement and this is taken as strong evidence for the importance of this friction in determining strength and mechanical failure. These results clearly establish experimentally the role of friction in determining strength with or without applied pressure. An empirical relationship between strength, pressure and strain rate is also obtained for this pressure range and the failure strength of EDC37 is more sensitive to pressure than strain rate.Published by Elsevier Ltd.

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Section: Coulomb Friction Model For the Low Pressure Range (Range I)mentioning

confidence: 99%

Pressure and friction dependent mechanical strength – cracks and plastic flow

Wiegand¹,

Redingius²,

Ellis

et al. 2011

International Journal of Solids and Structures

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“…* Below T g,Kel-F , recycled lots demonstrate higher ultimate strength and elastic modulus, and lower strain-to-failure than virgin lots. Material fracture occurs preferentially in the binder [4,7,10,11].…”

Section: Quasi-static Tension Testsmentioning

confidence: 99%

Microstructural Differences between Virgin and Recycled Lots of PBX 9502

Peterson

Idar

2005

Propellants Explo Pyrotec

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PBX 9502 is an insensitive high explosive formulated comprised of 95 wt% TATB and 5 wt% Kel-F 800 TM binder. Due to the relatively high cost of manufacturing TATB (triaminotrinitrobenzene), methods for reclaiming TATB from PBX 9502 machine cuttings were previously developed. Reclaimed PBX 9502 was mixed with~50% virgin PBX 9502 to produce "recycled" lots of PBX 9502. Several studies have shown significant differences between the mechanical properties of virgin and recycled lots of PBX 9502, and postulated that the differences were related to various aspects of TATB particle size and distribution. The purpose of this study is to show that these differences in mechanical properties are related to differences in the distribution of TATB within the microstructure of PBX 9502. Ultimately, a better understanding of these properties may lead to selected formulation changes for future rebuilds, Lifetime Extension Programs (LEP) and/or candidate replacements to enhance engineering and physics performance.

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“…Interfacial debonding also governs fracture of high explosives. Experiments have repeatedly shown that crack propagation in the high explosive PBX 9501 is always along the particle/matrix interfaces (e.g., Wiegand and Pinto, 1996;Rae et al, 2002a,b). This is because the particle volume fraction is very high ($93%), and the energetic particles are hardly fractured.…”

Section: Introductionmentioning

confidence: 99%