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Fatigue behavior of graphene nanoplatelets reinforced and unreinforced basalt/epoxy composite pressure vessels subjected to low-velocity impact under internal pressure
Journal of Composite Materials ( IF 2.9 ) Pub Date : 2021-08-24 , DOI: 10.1177/00219983211037058
Harun Sepetcioglu 1 , Necmettin Tarakcioglu 1
Affiliation  

In this study, the fatigue behavior of 0.25 wt.% graphene nanoplatelets (GnPs) reinforced and unreinforced impact damaged basalt/epoxy composite pressure vessels (CPVs) was investigated. The CPVs were subjected to low-velocity impact (LVI) of 2.5 J, 5 J, 7.5 J, 10 J, 15 J, 20 J, and 25 J under internal pressure of 50 bar (hoop/axial prestresses: 98/49 MPa). Then, to detect fatigue life changes, fatigue tests were performed at load rates of 30% of ultimate hoop stress (σHS), where sweat damage occurred in the basalt/epoxy CPVs under alternating internal pressure. Considering the remaining fatigue life and formation of the damages in the CPVs for all impact energies, to investigate the fatigue behavior and GnPs effects of CPVs subjected to low-velocity impact, an impact value of 5 J was preferred. The 5 J impact damaged CPVs were subjected to fatigue cyclic following ASTM D 2992 at load rates of 20%, 25%, 30%, 35%, and 40% of the σHS. The fatigue life of damaged CPVs was compared by that of undamaged over S-N curves. As the impact energy increased, the impact damage area increased. The increased size of damage reduced the fatigue life of basalt/epoxy CPVs. At the fatigue load rates mentioned above, the GnPs improved the fatigue life of damaged basalt/epoxy CPVs by about 3.5, 3.2, 11.3, 2.4, and 5 times, respectively.



中文翻译:

石墨烯纳米片增强和未增强玄武岩/环氧树脂复合压力容器在内压下低速冲击下的疲劳行为

在这项研究中,研究了 0.25 wt.% 石墨烯纳米片 (GnPs) 增强和未增强的冲击损坏玄武岩/环氧树脂复合压力容器 (CPV) 的疲劳行为。CPV 在 50 bar 的内压(环箍/轴向预应力:98/49 MPa)下经受了 2.5 J、5 J、7.5 J、10 J、15 J、20 J 和 25 J 的低速冲击)。然后,为了检测疲劳寿命变化,在 30% 的极限环向应力 (σ HS),其中玄武岩/环氧树脂 CPV 在交替内部压力下发生汗水损伤。考虑到所有冲击能量下 CPV 的剩余疲劳寿命和损伤的形成,为了研究 CPV 在低速冲击下的疲劳行为和 GnPs 效应,5 J 的冲击值是首选。根据 ASTM D 2992,在 20%、25%、30%、35% 和 40% 的 σ HS载荷率下,5 J 冲击损坏的 CPV 经受疲劳循环. 损坏的 CPV 的疲劳寿命与未损坏的 SN 曲线进行比较。随着冲击能量的增加,冲击损伤面积增加。损伤尺寸的增加降低了玄武岩/环氧树脂 CPV 的疲劳寿命。在上述疲劳载荷率下,GnPs 将受损玄武岩/环氧树脂 CPV 的疲劳寿命分别提高了约 3.5、3.2、11.3、2.4 和 5 倍。

更新日期:2021-08-24
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