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Materials 2017, 10(6), 660; doi:10.3390/ma10060660

Experimental Investigation of the Acoustic Nonlinear Behavior in Granular Polymer Bonded Explosives with Progressive Fatigue Damage

1
Institute of Chemical Materials, China Academy of Engineering Physics, Mianyang 621900, China
2
School of Aerospace Engineering, Xiamen University, Xiamen 361005, China
*
Authors to whom correspondence should be addressed.
Received: 25 April 2017 / Revised: 7 June 2017 / Accepted: 13 June 2017 / Published: 16 June 2017
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Abstract

The measurement of acoustic nonlinear response is known as a promising technique to characterize material micro-damages. In this paper, nonlinear ultrasonic approach is used to characterize the evolution of fatigue induced micro-cracks in polymer bonded explosives. The variations of acoustic nonlinearity with respect to fatigue cycles in the specimens are obtained in this investigation. The present results show a significant increase of acoustic nonlinearity with respect to fatigue cycles. The experimental observation of the correlation between the acoustic nonlinearity and fatigue cycles in carbon/epoxy laminates, verifies that an acoustic nonlinear response can be used to evaluate the progressive fatigue damage in the granular polymer bonded explosives. The sensitivity comparison of nonlinear and linear parameters of ultrasonic waves in the specimens shows that nonlinear acoustic parameters are more promising indicators to fatigue induced micro-damage than linear ones. The feasibility study of the micro-damage assessment of polymer bonded explosives by nonlinear ultrasonic technique in this work can be applied to damage identification, material degradation monitoring, and lifetime prediction of the explosive parts. View Full-Text
Keywords: polymer bonded explosives; micro-cracks; acoustic nonlinearity; fatigue polymer bonded explosives; micro-cracks; acoustic nonlinearity; fatigue
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Yang, Z.; Tian, Y.; Li, W.; Zhou, H.; Zhang, W.; Li, J. Experimental Investigation of the Acoustic Nonlinear Behavior in Granular Polymer Bonded Explosives with Progressive Fatigue Damage. Materials 2017, 10, 660.

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