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Technical Brief

On the Thermomechanical Response of HTPB-Based Composite Beams Under Near-Resonant Excitation

[+] Author and Article Information
Daniel C. Woods, Jacob K. Miller

School of Mechanical Engineering,
Birck Nanotechnology Center and
Ray W. Herrick Laboratories,
Purdue University,
West Lafayette, IN 47907

Jeffrey F. Rhoads

School of Mechanical Engineering,
Birck Nanotechnology Center and
Ray W. Herrick Laboratories,
Purdue University,
West Lafayette, IN 47907
e-mail: jfrhoads@purdue.edu

1Corresponding author.

Contributed by the Technical Committee on Vibration and Sound of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received February 12, 2015; final manuscript received February 22, 2015; published online April 27, 2015. Editor: I. Y. (Steve) Shen.

J. Vib. Acoust 137(5), 054502 (Apr 27, 2015) (5 pages) Paper No: VIB-15-1053; doi: 10.1115/1.4029996 History: Received February 12, 2015

Currently, there is a pressing need to detect and identify explosive materials in both military and civilian settings. While these energetic materials vary widely in both form and composition, many traditional explosives consist of a polymeric binder material with embedded energetic crystals. Interestingly, many polymers exhibit considerable self-heating when subjected to harmonic loading, and the vapor pressures of many explosives exhibit a strong dependence on temperature. In light of these facts, thermomechanics represent an intriguing pathway for the stand-off detection of explosives, as the thermal signatures attributable to motion-induced heating may allow target energetic materials to be distinguished from their more innocuous counterparts. In the present work, the thermomechanical response of a sample from this class of materials is studied in depth. Despite the nature of the material as a polymer-based particulate composite, classical Euler–Bernoulli beam theory, along with the complex modulus representation for linear viscoelastic materials, was observed to yield predictions of the thermal and mechanical responses in agreement with experimental investigations. The results of the experiments conducted using a hydroxyl-terminated polybutadiene (HTPB) beam with embedded ammonium chloride (NH4Cl) crystals are presented. Multiple excitation levels are employed and the results are subsequently compared to the work's analytical findings.

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Figures

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Fig. 1

The experimental sample, an HTPB beam with embedded NH4Cl crystals, mounted on a TIRA 59335/LS AIT-440 electrodynamic shaker

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Fig. 2

The experimental H1 mechanical frequency response estimators for three levels of excitation. The blue, green, and red curves represent responses at 1, 1.86, and 2.44 g RMS, respectively (see color version online). Solid lines correspond to data from the center point and dashed lines correspond to data from the offset point.

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Fig. 3

The experimental maximum and mean transient surface temperatures obtained with harmonic forcing near the first natural frequency. The red, green, and blue data points represent responses to forcing at 1 g, 2 g, and 3 g, respectively (see color version online). Circles correspond to maximum surface temperatures and “x” correspond to mean surface temperatures.

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Fig. 4

The experimental surface temperature distribution recorded after 60 mins in response to harmonic forcing at: (a) 1 g; (b) 2 g; and (c) 3 g. Forcing was near the first natural frequency for each case.

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Fig. 5

The maximum and mean transient surface temperatures obtained in the 3D numerical simulation with harmonic forcing near the first natural frequency. The red, green, and blue curves represent responses to forcing at 1 g, 2 g, and 3 g, respectively (see color version online). Bold lines correspond to maximum surface temperatures and thin lines correspond to mean surface temperatures.

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Fig. 6

The steady-state surface temperature distribution obtained in the 3D numerical simulation in response to 3 g harmonic forcing near the first natural frequency

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