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Nanofractography Of Composition B Fracture Surfaces with AFM

Published online by Cambridge University Press:  01 February 2011

Y. D. Lanzerotti ,
J. Sharma ,
R. W. Armstrong ,
R. L. McKenney  and
T. R. Krawietz
Y. D. Lanzerotti
Affiliation:
U. S. Army ARDEC, Picatinny Arsenal, NJ 07806–5000
J. Sharma
Affiliation:
Naval Surface Warfare Center, Carderock Division, West Bethesda MD 20817–5700
R. W. Armstrong
Affiliation:
AFRL-MNME, 2306 Perimeter Rd., Eglin AFB, FL 34542–5910
R. L. McKenney
Affiliation:
AFRL-MNME, 2306 Perimeter Rd., Eglin AFB, FL 34542–5910
T. R. Krawietz
Affiliation:
AFRL-MNME, 2306 Perimeter Rd., Eglin AFB, FL 34542–5910
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Abstract

The characteristics of TNT (trinitrotoluene) crystals in the fracture surface of Composition B (a melt-cast mixture of TNT and RDX) have been studied using atomic force microscopy (AFM). The size of TNT crystals has been examined by analyzing the surface structure that is exhibited after mechanical failure of the Composition B. The failure occurs when the material is subjected to high acceleration in an ultracentrifuge and the shear or tensile strength is exceeded. AFM examination of the topography of the Composition B fracture surface reveals fracture across columnar grains of the TNT. The width of the columnar TNT grains ranges in size from ∼ 1 μm to ∼ 2 μm. Their height ranges in size from ∼ 50 nm to ∼ 300 nm. Flat TNT columns alternate with TNT columns containing river patterns that identify the direction of crack growth. Steps in the river patterns are a few nanometers in depth. The TNT constitutent fracture surface morphology is shown to occur on such fine scale, beginning from adjacent columnar crystals only 1–2 μm in width, and including river marking step heights of only a few nanometers, that AFM-type resolution is required.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 800: Symposium AA – Synthesis, Characterization, and Properties of Energetic/Reactive Nanomaterials , 2003 , AA6.5
Copyright
Copyright © Materials Research Society 2004

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References

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