Ultra-lightweight fiber-reinforced envelope material for high-altitude airship

Vallabh, Rahul; Li, Ang; Bradford, Philip D.; Kim, David; Seyam, Abdel‐Fattah M.

doi:10.1080/00405000.2021.1948695

Cited by 7 publications

(4 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A series of studies on the optimal design of airship envelope structures have been carried out (Liu et al, 2015; Vallabh et al, 2022). Yang et al proposed a design method for overpressure balloons with a cable-net balloon structure.…”

Section: Introductionmentioning

confidence: 99%

Experimental study and refined numerical simulation of ultimate pressure-bearing performance of rope-reinforced airship envelope structures

Li,

Chen,

Chen

et al. 2024

Advances in Structural Engineering

View full text Add to dashboard Cite

Stratospheric airships require a lightweight envelope to contain lighter-than-air buoyancy gas, making the lightweight design and pressure-bearing performance of the envelope structure a key research issue. The stress state at different cross-sectional positions of the airship envelope structure is different, resulting in a low utilization rate of the overall material performance of the envelope structure. This paper proposes a design scheme for reinforcing envelope structures with sliding reinforcing cable to improve the bearing capacity of the composite fabric structure while reducing its weight, ultimately achieving the optimal strength-to-weight ratio. Two types of composite fabric structures (A-airship and B-airship) were subjected to inflatable burst tests, and the strain changes in the envelope gores were analyzed by digital image correlation. Through re-assembly of the broken composite fabric pieces and analysis of their tear textures, crack origination positions, failure causes, and the stress behavior and state at the failure position were identified. An envelope structural model with consideration of the cutting pattern effect was established, allowing the stress distribution of the envelope to be analyzed and the damage positions to be more accurately predicted. Based on the analysis of the ultimate pressure-bearing performance of an airship envelope structure, a novel idea of incorporating coupled tensile-shear stress into the strength criterion was proposed. Through the data in the study and existing references, it is verified that the strength criterion can accurately predict the ultimate pressure-bearing performance of the envelope structure.

show abstract

Section: Introductionmentioning

confidence: 99%

Experimental study and refined numerical simulation of ultimate pressure-bearing performance of rope-reinforced airship envelope structures

Li,

Chen,

Chen

et al. 2024

Advances in Structural Engineering

View full text Add to dashboard Cite

show abstract

“…However, the surface of AP is composed of ultrane brils, thus, making it difficult to disperse in EVOH because of the inherent inertness and easy entanglement. 17,18 Therefore, the compatibility of EVOH and AP needs to be enhanced so as to maximize the properties of EVOH/AP composites.…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide as a multi-functional additive for compatilizer, enhancer, and barrier in ethylene vinyl alcohol copolymer/aramid pulp composites

Yang

Liu

et al. 2023

RSC Adv.

View full text Add to dashboard Cite

show abstract

“…To satisfy the these requirements, envelope materials for aerostat are laminates designed, typically including heatsealing layer, load-carrying layer made of fabric, gasbarrier layer, weathering layer, and adhesive layers (Schäfer et al, 2002;Meng et al, 2017;Vallabh et al, 2021), as shown in Figure 1. The functional load-carrying layer, usually woven from aromatic polyamide (Vectran), polyester, polyethylene, and poly-pphenylenebenzobisthiazole fiber, provides the strength of the whole envelope materials to bear the load, as well as the pressure difference between the inside and outside of aerostat (Komatsu et al, 2003;Zhai and Euler, 2005;Nakadate et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

“…Kang et al (2006) developed a CAD model and characterized the static properties of envelope materials consisting of helium barrier, load-carrier, and thermal bonding layer, finding that the high stiffness and strength of Vectran-based envelope materials possess wide- Frontiers in Materials frontiersin.org ranging temperature applicability, from -75 to 65 °C. Vallabh et al (2021) proposed a novel design concept using fiberreinforced non-woven fabrics as load-bearing layer with EVOH and a vacuum-deposited aluminum-coated corrosion resistance layer for the envelope of high-altitude airships.…”

Section: Introductionmentioning

confidence: 99%

Study of performance of aerostat envelope materials on the coast

Lv¹,

Zhou²,

Yuan

et al. 2022

Front. Mater.

View full text Add to dashboard Cite

In this article, the performance of several naturally aged envelope materials in Hainan, China, was studied. The results show that the outer layer contributes to the properties of the envelope materials, where PVF and PVDF are better candidates for a weathering layer than TPU and aluminum. Due to the superior water and mildew resistance of PVF and PVDF, the loss of tensile strength for 3216LV and FV1175 was slight, whose value reduced from 101.43 ± 5.45 Kgf/cm and 76.15 ± 3.81 Kgf/cm to 79.73 ± 6.40 Kgf/cm and 70.20 ± 6.57 Kgf/cm, respectively, when aging for 24 months with the helium permeability reduction from 0.8818 L/m2•day•atm and 0.6360 L/m2•day•atm to 0.2047 L/m2•day•atm and 0.2169 L/m2•day•atm aging for 18 months, in the case of FV1175 showed leakage after aging for 24 months due to delamination. However, the tensile strength of HV150 dropped from 82.13 ± 3.61 Kgf/cm to 15.22 ± 2.16 Kgf/cm at 24 months with helium leakage, owing to heavy mildew and degradation. Meanwhile, ETAV150 also exhibited a decreased tensile strength of 57.92 ± 1.32 Kgf/cm after 6 months aging, 32.8% lower than that of the original sample, and showed leakage when aging for 12 months. This research provides a theoretical guidance for the structural design and screen of envelope materials for aerostat used along the coast.

show abstract

Ultra-lightweight fiber-reinforced envelope material for high-altitude airship

Cited by 7 publications

References 8 publications

Experimental study and refined numerical simulation of ultimate pressure-bearing performance of rope-reinforced airship envelope structures

Experimental study and refined numerical simulation of ultimate pressure-bearing performance of rope-reinforced airship envelope structures

Graphene oxide as a multi-functional additive for compatilizer, enhancer, and barrier in ethylene vinyl alcohol copolymer/aramid pulp composites

Study of performance of aerostat envelope materials on the coast

Contact Info

Product

Resources

About