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Chinese Journal of Materials Research  2016, Vol. 30 Issue (5): 379-387    DOI: 10.11901/1005.3093.2015.570
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Evaluation of Ressistance to Repeated Low-Velocity Impact of Composite Laminates with Polyurethane Coating
YUE Hailiang1, ZHANG Guoli1,**(), WANG Zhuangzhi2, GUO Ruiyan1
1. Key Laboratory of Advanced Textile Composites, Tianjin and Ministry of Education, Tianjin Polytechnic University, Tianjin, 300387, China
2. Weihai Guangwei Composites Material Co., Ltd, Weihai, 264200, China
Cite this article: 

YUE Hailiang, ZHANG Guoli, WANG Zhuangzhi, GUO Ruiyan. Evaluation of Ressistance to Repeated Low-Velocity Impact of Composite Laminates with Polyurethane Coating. Chinese Journal of Materials Research, 2016, 30(5): 379-387.

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Abstract  

The resistance to repeated low-velocity impact of PU coated composite laminates of different thickness was evaluated. The composite laminates were fabricated by compression molding method, and then were sand-blasted in order to increase their surface roughness, and finally were coated with PU of the same thickness. The composite laminates with and without PU coating were impacted repeatedly using a pressure-assisted Instron-Dynatup 9250 instrumented drop-weight impact tester until all the specimens were perforated, and then ultrasonic C-scan was used to detect the delimitation area after testing. It is observed that the influence of PU on the resistance to repeated impact of composite laminates is gradually decreasing after repeated impacting with the increasing of impacted energy, so the damage area of specimens are increasing after repeated impact. In addition, with the increasing thickness of composite laminates, the influence of PU acting on the resistance to repeated impact for all laminates is enhanced so that the damage area of specimens is gradually decreasing.

Key words:  composite      polyurethane coating      absorbed energy      impact damage area      maximum impact force      repeated impact performance     
Received:  12 October 2015     
ZTFLH:  B332  
Fund: *Supported by the Planned Science and Technology Project of Tianjin No.13TXSYJC40500 and Tianjin City High School Science & Technology Fund Planning Project No.2012ZD02
About author:  **To whom correspondence should be addressed, Tel: (022)83955899, E-mail: guolizhang@tjpu.edu.cn

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2015.570     OR     https://www.cjmr.org/EN/Y2016/V30/I5/379

Code of
specimen
Number of
layers
Thickness
/mm
Weight
/g
[0/90]6 12 2.0 56.2
[0/90]7 14 2.4 59.5
[0/90]8 16 2.8 62.7
[0/90]6-PU 12 3.0 66.7
[0/90]7-PU 14 3.4 69.8
[0/90]8-PU 16 3.8 73.2
Table 1  Structure parameters of specimen
Fig.1  Impact force-time curve (a) and impact force-deflection curve (b) of [0/90]6-PU with different impact energies
Fig.2  Repeated impact force-time curves of [0/90]6-PU (a) and [0/90]6 (b) at 5 J
Fig.3  Repeated impact force-time curves of [0/90]6-PU (a) and [0/90]6 (b) at 6.5 J
Fig.4  Repeated impact force-time curves of [0/90]6-PU (a) and [0/90]6 (b) at 7.5 J
Fig.5  Force versus number of impacts curves of composite plate impacted at different energy levels. (a) [0/90]6-PU, (b) [0/90]6
[0/90]6 No. of drops to perforation [0/90]6 -PU6 No. of drops to perforation
Impact energy Impact energy
5 J 8 5 J >60
6.5 J 6 6.5 J 51
7.5 J 3 7.5 J 12
Table 2  Total number of perforation for [0/90]6 and [0/90]6 -PU at different energy levels
Fig.6  Repeated impact force-time curves of [0/90]6-PU (a) and [0/90]6 (b) at 7.5 J
Fig.7  Repeated impact force-time curves of [0/90]7-PU. (a) and [0/90]7 (b) at 7.5 J
Fig.8  Repeated impact force-time curves of [0/90]8-PU (a) and [0/90]8 (b) at 7.5 J
Fig.9  Picture of damage progression of specimen with different thickness repeatedly impacted at 7.5 J
Fig.10  Force-impact number-absorbed energy on different thickness laminates with PU
Fig.11  C-Scan images of damage progression of repeatedly impacted on [0/90]8 (a) and [0/90]8-PU (b)
Fig.12  Variation of damage area with impact number for different thickness of samples
Laminate No. of drops to perforation Laminate No. of drops to perforation
[0/90]6 3 [0/90]6-PU 12
[0/90]7 5 [0/90]7-PU 24
[0/90]8 6 [0/90]8-PU 128
Table 3  The total number to perforation of specimens with different thickness
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