Next Article in Journal
Carbonate Apatite Containing Statin Enhances Bone Formation in Healing Incisal Extraction Sockets in Rats
Previous Article in Journal
Strong Dependence of Surface Enhanced Raman Scattering on Structure of Graphene Oxide Film
Article Menu
Issue 7 (July) cover image

Export Article

Open AccessArticle
Materials 2018, 11(7), 1200; https://doi.org/10.3390/ma11071200

Mechanical Response and Shear-Induced Initiation Properties of PTFE/Al/MoO3 Reactive Composites

College of Field Engineering, PLA Army Engineering University, Nanjing 210007, China
*
Author to whom correspondence should be addressed.
Received: 18 June 2018 / Revised: 3 July 2018 / Accepted: 9 July 2018 / Published: 12 July 2018
(This article belongs to the Section Advanced Composites)
View Full-Text   |   Download PDF [6875 KB, uploaded 12 July 2018]   |  

Abstract

Polytetrafluoroethylene/aluminum/molybdenum oxide (PTFE/Al/MoO3) reactive composites of a volume ratio of 60:16:24 were studied in this research. Quasi-static compression, dynamic compression and drop-weight experiments were performed to explore the mechanical response and the shear-induced initiation properties of the composites. Mesoscale images of the specimens after sintering demonstrate that PTFE, Al and MoO3 powders were evenly mixed and no chemical reaction occurred after the materials were stirred, pressed and sintered. The yield stress and compressive strength of PTFE/Al/MoO3 specimens are sensitive to strain rate within the range of 10−3~3 × 103 s−1, and the yield stress shows a bilinear dependence on the logarithm values of strain rate. The established Johnson-Cook constitutive model based on the experimental data can describe the mechanical response of PTFE/Al/MoO3 material well. Drop-weight tests show that the PTFE/Al/MoO3 specimens can react violently when impacted, with the characteristic drop height (H50) calculated as 51.57 cm. The recovered specimens show that the reaction started from the outer edge of the specimen with the largest shear force and the most concentrated shear deformation, indicating a shear-induced initiation mechanism. The reaction products of PTFE/Al/MoO3 specimens were AlF3, Al2O3, Mo and C, demonstrating that redox reaction occurred between PTFE and Al, and between Al and MoO3. View Full-Text
Keywords: mechanical response; PTFE/Al/MoO3 materials; split Hopkinson pressure bar (SHPB); constitutive model; shear-induced initiation mechanical response; PTFE/Al/MoO3 materials; split Hopkinson pressure bar (SHPB); constitutive model; shear-induced initiation
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Huang, J.; Fang, X.; Wu, S.; Yang, L.; Yu, Z.; Li, Y. Mechanical Response and Shear-Induced Initiation Properties of PTFE/Al/MoO3 Reactive Composites. Materials 2018, 11, 1200.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Materials EISSN 1996-1944 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top