Abstract
The delamination is a typical phenomenon when the carbon fiber reinforced composites (CFRC) undergoes blasting impact loading and the delamination will reduce both the strength and stiffness of the laminates, which can lead to catastrophic consequences while used as rocket skin. In this paper, the response of CFRC laminate is cut by flexible linear shaped charge (FLSC) and the delamination behavior of the CFRC is analyzed and discussed. The displacement interferometer system for any reflector (DISAR) is used to monitor the velocity of characteristic points of the laminate subjected to FLSC. Finite element analysis has been conducted to explain the mechanisms of delamination. Based on the numerical simulation, the influences of structural design parameters on the delamination effect of the CFRC after cutting are investigated. The results show that a large number of debris are produced at the center of the explosion and a small amount of large debris is produced at weakening groove on both sides. The delamination effect is greatly affected by the inter-laminar tensile strength and thickness of composite laminate, but it is not significantly affected by the linear density of the FLSC and stand-off.
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Acknowledgments
This wok was financially supported by National Natural Science Foundation of China [grant no. 11602030 & 11672328].
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Recommended by Editor Chongdu Cho
Jing Sun is a senior engineer at the China Aerospace Science and Tech-Nology Corporation one institute. She is mainly engaged in structural strength analysis and pyrotechnic separation device design.
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Sun, J., Ma, Z., Zhang, Z. et al. The delamination of carbon fiber reinforced composites during cutting by flexible linear shaped charge. J Mech Sci Technol 34, 1515–1522 (2020). https://doi.org/10.1007/s12206-020-0313-2
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DOI: https://doi.org/10.1007/s12206-020-0313-2