Abstract
The stratospheric airship envelope material is operated in biaxial stress, so it is necessary to study the in-plane biaxial tensile strength. In this paper, a theoretical model is developed to evaluate the mechanical properties of in-plane biaxial specimens. Being applied to the finite element analysis, the theoretical model is employed to evaluate the influence of strengthening material behavior (E*) and geometry parameters on the mechanical behavior in the central. The follows results are drawn: (i) smaller the length of the central region (Lcen), E* and larger the central region corner radius (r) contribute to smaller coefficient of variation (CV); (ii) smaller Lcen and larger E* contribute to smaller stress concentration factor (k), k in the limit state of r is larger than that in other conditions. (iii) The CV and k under stress ratio of 1:1 are smaller than those under other stress ratios. The study can provide a useful reference for the design of biaxial specimens.
Highlights
The stratospheric airship has attracted widespread attentions with potential applications in radio relay telecommunications service, earth observation science, and other fields [1,2,3,4]
Chen et al [12] studied the tensile properties of envelope fabric Uretek-3216A under biaxial cyclic loading; the results show that the elastic constants noticeably vary with the experimental protocols
This paper aims to develop a theoretical model for evaluating the effects of modulus and geometry parameters of the central region of reinforced materials on the mechanical properties of envelope materials
Summary
The stratospheric airship has attracted widespread attentions with potential applications in radio relay telecommunications service, earth observation science, and other fields [1,2,3,4]. Envelope material is a major part of airship structure. The mechanical properties and service life for envelope material determine the lifetime of airship [5,6]. The typical envelope of the non-rigid airship structure is laminated fabric composites [7]. The laminated material is used to contain lifting gas and provide structural strength for the system. The uniaxial tensile test has been widely used to study the mechanical properties of envelope materials. Meng et al [8] developed a theoretical model to predict fatigue life on envelope material under uniaxial cycle load. The theoretical model is in good agreement with the experimental results
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