Abstract
This paper reports the biaxial tensile mechanical properties of the envelope material through experimental and constitutive models. First, the biaxial tensile failure tests of the envelope material with different stress ratio in warp and weft directions are carried out. Then, based on fiber-reinforced continuum mechanics theory, an anisotropic hyperelastic constitutive model on envelope material with different stress ratio is developed. A strain energy function that characterizes the anisotropic behavior of the envelope material is decomposed into three parts: fiber, matrix and fiber–fiber interaction. The fiber–matrix interaction is eliminated in this model. A new simple model for fiber–fiber interaction with different stress ratio is developed. Finally, the results show that the constitutive model has a good agreement with the experiment results. The results can be used to provide a reference for structural design of envelope material.
Highlights
The stress of stratospheric airship envelope material usually comes from two or more directions in practical application; it is necessary to test envelope material by biaxial or multiaxial tension.In this paper, the mechanical properties of envelope materials are studied by biaxial tensile testing.There are mainly three kinds of biaxial tensile tests [1]: (1) the bursting test; (2) the cylinder test; and (3) the plane biaxial test
Discussionmodel provides the possibility of predicting the mechanical responses of The new envelope material of all,the thepossibility constitutive of the enveloperesponses materials in
The new constitutive model First provides of parameters predicting the mechanical of the biaxial tensile tests, with equal stress ratios, were obtained
Summary
The mechanical properties of envelope materials are studied by biaxial tensile testing. There are mainly three kinds of biaxial tensile tests [1]: (1) the bursting test; (2) the cylinder test; and (3) the plane biaxial test. The ration of warp and weft stress is fixed. The effect of joints on the results should be considered. In plane biaxial tensile tests, there are two main types [2]: (1) tests using a single loading system and (2) tests using two or more independent loading systems. The stress ratio of warp and weft is limited when adopting the first loading. Taking secondary kinds of loading forms can achieve different stress ratios of warp and weft
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