The image analysis method is used for the evaluation of the mechanical behaviour of bias stretched woven material and determination of the zones and values of local deformations of the specimen. To demonstrate the capabilities and reliability of the proposed image analysis method, the simplest and most commonly used uniaxial tensile test was chosen. Using the acquired images, local deformations of the specimen in transverse and longitudinal directions were estimated and regularities of the variation of uniform deformation zones were assessed.
Comparison of the behaviour of materials shows that increase in bending rigidity changes the deformation character of materials. For non-laminated low flexure rigidity materials the formation of localized deformation zones was estimated at primary stages of deformation, as in the case of stiffer laminated fabric the zones of uniform deformations spread more and do not concentrate within the centre of the specimen. The different nature and shape of local deformation zones indicate that the behaviour of laminated materials is closer to that of isotopic materials.
The obtained results show that image analysis can describe the response of low flexure rigidity material to external forces. This method supplements the investigation process of woven materials, increases the accuracy of measurements, and determines the real-time local strains.
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