Research on Strain Monitoring of Vacuoles Based on Binocular Digital Image Correlation Method

With the widespread application of aerospace devices, the structural reliability of their long-term working environment faces severe challenges. As the core component of the aerial device to maintain the pneumatic appearance and bearing stress, the bladder skin is prone to microscopic cracks, tear damage and other defects due to the coupling of material aging, extreme temperature change and mechanical load. Traditional contact detection methods detect defects by measuring changes in the physical quantity of the surface of the cuff skin, but this method has problems such as complex wiring and difficulty in capturing dynamic damage evolution. Therefore, this paper uses the non-contact deformation measurement concept based on the digital image correlation (DIC) to monitor the stress changes of the cuff skin. The experimental results show that: The mechanical properties of the bladder skin material in different shear directions are significantly anisotropic, and the strain distribution on the bladder skin surface is non-uniform. Through continuous monitoring, we observed the dynamic damage evolution process of the bladder skin under load, which provides an important basis for understanding its long-term service performance. These conclusions can not only deepen our understanding of the mechanical properties and damage mechanism of the bladder skin, but also provide strong technical support for the safe and reliable operation of the aerostat.