浮空器蒙皮力学行为分析及本构建模

doi:10.7527/S1000-6893.2023.29588

Abstract

Abstract:

To meet the requirements of load-bearing and special environmental adaptability， the envelope of near-space operational aerostats consists of multiple layers， such as high-performance fiber fabrics， helium barrier layers， weather layers， and adhesive layers. Since the internal pressure inside the envelope directly determines load-bearing capacity of the aerostat， it is necessary to develop a reliable constitutive model to predict the equivalent mechanical properties of the envelope， which therefore， lays the foundation for strength and life evaluations of the airship. Effects of fiber fabrics and functional layers on the equivalent mechanical properties of the envelope were investigated by experimental characterizations. Based on experimental results， an equivalent constitutive model was developed to study the anisotropic and nonlinear mechanical behavior of the envelope. For both uniaxial and off-axis tensile conditions， predictions on the effective stress， yarn shear angle and specimen cross-sectional contraction agree well with experimental results. The combined experimental and numerical studies have led to insightful understanding between the overall mechanical response and microstructure deformation of the envelope.

Key words: aerostat envelope, constitutive model, microstructure deformation, anisotropy, nonlinearity

CLC Number:

V274

Yunchao XIA, Jian DENG, Zengxian WANG, Qiang LIU, Tianjian LU. Mechanical behavior of aerostat envelope and constitutive modeling[J]. Acta Aeronautica et Astronautica Sinica, 2024, 45(13): 229588-229588.

Figures/Tables 15

Fig.1

Fig.2

Fig.3

Fig.4

Fig.5

Fig.6

Fig.7

Table 1

Material properties and parameters in model

方向	$E i 1$ /MPa	$E i 2$ /MPa	β_i	ε_i_，crimp	ε_i_，trans
纬向（i=1）	3 500	53 500	200	0.009	0.03
经向（i=2）	2 500	48 500	200	0.018	0.03

Table 1

Table 2

Geometric and shear parameters of material in model

参数类别	参数	数值
剪切参数	C₁/（N·mm）	0.5
	C₂/rad^-1	80
	C₃/（N·mm）	0.08
	C₄/rad^-1	2.47
	γ₀/rad	0.5
几何参数	$w 10$ /mm	0.458
	$w 20$ /mm	0.458
	t_f/mm	0.15
	ρ_fiber/（g·cm^-3）	1.44
	T_D/D	600

Table 2

Fig.8

Fig.9

Fig.10

Fig.11

Fig.12

Fig.13

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Mechanical behavior of aerostat envelope and constitutive modeling

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