Defence Technology 14 (2018) xx-xx

The primary submission should be in two format :single-column or two columns.

(Title usually falls within 3 lines. All lexical words, as well as prepositions over 5 letters (including 5) should be initials in capital.)

Research on Dynamic Response Characteristics of CFRP/Al HC SPs Subjected to High-velocity Impact(Author affiliations should be listed according to the name order under the paper title. The corresponding author should be marked with “*” on the top right.)

Guo-wen GAO, En-ling TANG*

School of Equipment Engineering ,Shenyang Ligong University，Shenyang

110159，China

Abstract（Abstract should be about 150-200 words which can conclude the whole content of the paper (including purpose, method, results and conclusion). Equations, figures and tables, as well as references are not supposed to appear in this part. When abbreviation is firstly used, it should contain the full name with its abbreviation included in parentheses, such as “signal to noise ratio (SNR)”. Do NOT use the first person as subject. Do NOT repeat the title as the first sentence of the abstract. Simple sentence and active voice are preferred, and verb should be close to the subject.)

CFRP/Al HC SPs (Carbon Fiber Reinforced Plastic/Aluminum Honeycomb Sandwich Panels)composite structures are widely used in the aerospace and many other fields due to their excellent performances. In order to reveal profoundly the dynamic response characteristics of CFRP/Al HC SPs composite structure under high-velocity impact loading, the experiments about aluminum honeycomb core and CFRP/Al HC SPs composite structure impacted by high-velocity projectiles have been performed by using a one-stage light gas gun loading and a high-speed camera systems, respectively.The whole physical process of collision is analyzed by using TEMA software which is provided by high-speed camera's manufacturer, and the pictures and related physical parameters of the projectile passing through the different layers at the key moments are extracted based on the set frame rate of the video. Meanwhile, the ABAQUS/Explicit module was used to conduct numerical simulation under the same conditions as the experiments, and extracting the pictures and

related physical parameters during the projectile penetrating through aluminum honeycomb core and the sandwich panels at the different key moments.The results show that the durations of action for the projectile impacting the Al HC core and the CFRP/Al HC SPs at the velocity about 280 m/s were 86 μs and 240 μs in experiments, respectively, and the durations of action were 90.7 μs and 236.2 μs at the same experimental conditions in numerical simulation, which were basically consistent comparing the experimental to simulated results. Moreover, more than 70% for the kinetic energy of the projectile consumed by the sandwich panels was attributed to the front panel and the aluminum honeycomb core during the entire impact process, and all these have verified the reliability of the numerical simulation.Keywords: CFRP/Al HC SPs; ABAQUS/Explicit; Duration of action between projectile and target; Energy absorption(about 5-8 words separated with “;”; use small letters except technical terms. Abbreviations should contain full name with abbreviation included in parentheses. Selection of 1-2 from EI controlled term list is preferred:

1. Introduction(Begin each paragraph with an equal indentation of two typing spaces.)

CFRP has an excellent properties such as a high specific strength, a big specific stiffness, a small thermal expansion coefficient as well as a large area integral forming easily. Its performance parameters are superior to steel, which has been widely used in many fields[1,2].

The durations of action and the energy distributions in each layer were obtained during the projectile-impacted single aluminum honeycomb core and the CFRP/Al HC sandwich panels, respectively. TThe simulated results were basically consistent with the experimental results, and all these have verified the reliability of the numerical simulation.

(Equations, figures and tables are usually not supposed to appear in this part.)

2. Experiment2.1 Loading and testing systemThe experiments have been performed at Intense Dynamic Research Center of Shenyang Ligong University, China. …2.2 Experimental materials and parameters2.2.1 Carbon fiber reinforced plastic(CFRP)2.2.2 Aluminum honeycomb core2.2.3 Projectile’s nature and experimental parameters

3. Experimental results and analysis3.1 Damage analysis of the target3.1.1 The damage of aluminum honeycomb core3.1.2 Damage of each component of CFRP/Al HC sandwich panels3.2 Pictures acquisitionA detailed guide on electronic artwork is available on our website:

http://www.elsevier.com/artworkinstructions

You are urged to visit this site; some excerpts from the detailed information are given here. Formats Regardless of the application used, when your electronic artwork is finalised, please "save as" or c-onvert the images to one of the following formats (note the resolution requirements for line drawings, halftones, and line/halftone combinations given below): EPS: Vector drawings. Embed the font or save the text as "graphics". TIFF: color or grayscale photographs (halftones): always use a minimum of 300 dpi. TIFF: Bitmapped line drawings: use a minimum of 1000 dpi. TIFF: Combinations bitmapped line/half-tone(color or grayscale): a minimum of 500 dpi is required. If your electronic artwork is created in a Microsoft Office application (Word, PowerPoint, Excel) then please supply "as is". Please do not: • Supply files that are optimised for screen use(like GIF, BMP, PICT, WPG); the resolution is too lo-w; • Supply files that are too low in resolution; • Submit graphics that are disproportionately large for the content.

Color artwork Please make sure that artwork files are in an acceptable format (TIFF, EPS or MS Office files) and with the correct resolution. If, together with your accepted article, you submit usable color figures then Elsevier will ensure, at no additional charge,that these figures will appear in color on the Web (e.g., ScienceDirect and other sites) regardless of whether or not these illustrations are reproduced in color in the printed version.

Fig.5. Related results of projectile flight attitude obtained by TEMA software

3.3 Comparison of laser velocity measurement and high-speed camera acquisition velocity

Table 3 The comparison between laser measurement velocity and the velocity obtained by a high-speed camera

Experiment codes

Target structure

Initial velocity from laser measurement /(m∙s-

1)

Initial velocity from video /(m∙s-1)

Initial velocity error/%

Residual velocity /(m∙s-1)

Video frame rate /fps

No.1 Al HC core 263.7 260.5 1.21 221.6 46746No.2 Al HC core 277.6 276.4 0.43 240.5 46746No.3 CFRP/Al HC

SPs284.9 281.3 1.26 173.3 53101

No.4 CFRP/Al HC SPs

295.2 290.6 1.56 179.3 53101

4. Numerical simulation4.1 Modeling4.2 Constitutive equations

4.2.1 CFRP composite material

4.2.2 Aluminum honeycomb core

（1）

Where, is Von Mises equivalent stress, A is the quasi-static yield strength of the material

at room temperature, B is the strain enhancement coefficient, and n is the enhanced index.

However, is equivalent plastic deformation, is the plastic strain rate, is the initial

strain rate,C is the strain rate sensitivity coefficient, m is the temperature softening

coefficient, is the melting point of the material, is the reference temperature (normal

temperature) and is the current temperature.

5. Numerical simulation results and analysis

5.1 Comparison of target topography between simulated and experimental results

5.2 Comparison of simulated and experimental results in residual velocity and duration of

action during projectile impacting on target

6. Conclusions

(Conclusion should be summarized in points without tedious description of background,

method, etc.)(1)The initial and residual velocities obtained by numerical simulation are basically

consistent with the experimental results.

(2)In experiments, the duration of action for the projectile impacting the single

aluminum honeycomb core and the CFRP/Al HC sandwich panels at a speed of about 280

m/s was 86 μs and 240 μs, respectively. Under the same conditions, the numerical

simulation results of the duration of action were 90.7 μs and 236.2 μs, respectively.The

simulated results are basically consistent with experimental results.

Acknowledgements

The authors would like to acknowledge National Natural Science Foundation of china

(Grant No. *****), Open Foundation of Hypervelocity Impact Research Center of

CARDC( Grant No. 20180201) and Open Project of State Key Laboratory of Explosion

Science and technology in Beijing Institute of Technology (Grant No. ******) to provide fund

for conducting experiments.

References

Text: Indicate references by superscript numbers in the text. The actual authors can be referred to, but the reference number(s) must always be given. List: Number the references in the list in the order in which they appear in the text. Examples:

Reference to a journal publication (Journal names should be abbreviated, but if you are uncertain, keep it in full name)

[1]Li W, Guo QF. Application of carbon fiber composites to cosmonautic field.Chinese

Journal of Optics 2011;4(3):201-211.

Reference to a Journal

…

[14]Johnson G, Cook W. A Constitutive Model and Data for Metals Subjected to Large

Strains High Rates and High Temperatures, in Proceedings of the Seventh International

Symposium on Ballistics,The Netherlands,The Hague,1983：541-547.

Conference proceedings

…Reference to a book

Conference paper

Scientific or technical report

Dissertation

Patent

Journal article on the Internet

Article not in English

Monograph on the Internet

Homepage/Web site

Note shortened form for last page number. e.g., 51–9, and that for more than 6 authors, the first 6 should be listed followed by ‘et al.’ For further details you are referred to “Uniform Requirements for Manuscripts submitted to Journals” click “https://www.journals.elsevier.com/defence-technology/”

Appendix

(Appendix is put behind biography unless otherwise specified. If there is more than one, order them with capitalized letters. If there are equations, order them with letters and numbers, such as “(A1)” and “(A2)”.)