Study on Damage Mechanisms and Blast Mitigation of GFRPU and Coated Steel Plates
7 affiliations
- 1Nanchang Institute of Science and Technology, Nanchang 330108, China
- 2School of Aeronautics Mechanical and Electrical Engineering, Jiangxi Flight University, Nanchang 330014, China
- 3State Key Laboratory of Precision Blasting, Jianghan University, Wuhan 430056, China
- 4Hubei Key Laboratory of Blasting Engineering, Jianghan University, Wuhan 430056, China
- 5Department of Engineering Technology and Applications, Army Infantry Academy of PLA, Nanchang 330103, China
- 6School of Civil Engineering, Qingdao University of Technology, Qingdao 266525, China
- 7Qingdao Shamu Advanced Material Co., Ltd., Qingdao 266108, China
Abstract
Conventional fabrication processes for fiber-reinforced composites are complex and stepwise, limiting their application in blast protection engineering. In this study, KH550 surface-modified glass fiber powder (1.5 wt%) was incorporated into a polyurea matrix, and a homogeneous glass fiber-reinforced polyurea (GFRPU) composite was successfully synthesized via an optimized one-step spray process. The strain-rate-dependent mechanical behavior (0.01–100 s−1), fracture mechanisms, molecular structure, and blast mitigation performance of GFRPU were systematically investigated through mechanical testing, SEM, FTIR, 75 g TNT contact explosion tests, and calibrated and partially verified finite element simulations. Results show that the surface-modified fibers form chemical crosslinks with the matrix, shortening the N–H hydrogen bond length from 3.023 Å to 2.983 Å and increasing the hydrogen bonding degree of the urea carbonyl region from 80.0% to 84.1%, thereby enhancing structural ordering and strength. At a strain rate of 100 s−1, the tensile strength of GFRPU reaches 50.27 MPa, 26% higher than that of the polyurea matrix. Under contact explosion, a 4 mm back-face GFRPU coating reduced the center-point deflection of the steel plate by 31.6% and suppressed brittle cracking, with interfacial debonding and coating tensile failure as the dominant failure modes. Considering protective efficiency and structural safety, 4 mm is recommended as the optimal coating thickness.
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BibTeX
@article{ye2026study,
title = {{Study on Damage Mechanisms and Blast Mitigation of GFRPU and Coated Steel Plates}},
author = {Xiaojun Ye and Quanmin Xie and Dongxian Ye and Rui Zhang and Fuyin Gao and Yanshu Fu and Yongkang Xu and Yaoli Hu and Weibo Huang and Longqiang Liang},
journal = {Polymers},
year = {2026},
month = oct,
doi = {10.3390/polym18202602},
url = {https://www.mdpi.com/2073-4360/18/20/2602},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Study on Damage Mechanisms and Blast Mitigation of GFRPU and Coated Steel Plates
AU - Xiaojun Ye
AU - Quanmin Xie
AU - Dongxian Ye
AU - Rui Zhang
AU - Fuyin Gao
AU - Yanshu Fu
AU - Yongkang Xu
AU - Yaoli Hu
AU - Weibo Huang
AU - Longqiang Liang
PY - 2026
DA - 2026/10/01
JO - Polymers
DO - 10.3390/polym18202602
UR - https://www.mdpi.com/2073-4360/18/20/2602
AB - Conventional fabrication processes for fiber-reinforced composites are complex and stepwise, limiting their application in blast protection engineering. In this study, KH550 surface-modified glass fiber powder (1.5 wt%) was incorporated into a polyurea matrix, and a homogeneous glass fiber-reinforced polyurea (GFRPU) composite was successfully synthesized via an optimized one-step spray process. The strain-rate-dependent mechanical behavior (0.01–100 s−1), fracture mechanisms, molecular structure, and blast mitigation performance of GFRPU were systematically investigated through mechanical testing, SEM, FTIR, 75 g TNT contact explosion tests, and calibrated and partially verified finite element simulations. Results show that the surface-modified fibers form chemical crosslinks with the matrix, shortening the N–H hydrogen bond length from 3.023 Å to 2.983 Å and increasing the hydrogen bonding degree of the urea carbonyl region from 80.0% to 84.1%, thereby enhancing structural ordering and strength. At a strain rate of 100 s−1, the tensile strength of GFRPU reaches 50.27 MPa, 26% higher than that of the polyurea matrix. Under contact explosion, a 4 mm back-face GFRPU coating reduced the center-point deflection of the steel plate by 31.6% and suppressed brittle cracking, with interfacial debonding and coating tensile failure as the dominant failure modes. Considering protective efficiency and structural safety, 4 mm is recommended as the optimal coating thickness.
SN - 2073-4360
ER -