Abstract
The paper presents the results of application of different techniques for processing of digital image correlation data. The algorithms are described and applied for determination of elasticity modulus of carbon fiber reinforced polymer specimens tested by uniaxial tension. Two ways of evaluation of elongation along with two methods of elastic modulus calculation resulted in four techniques which have shown quite similar results with a scatter of 0.5-2%.
Highlights
Evaluation of the properties of materials during their mechanical testing is an urgent task
Experimental results and discussion Tensile elongation of the tested carbon fiber reinforced polymers (CFRP) specimens exceeds 6000 με according to ASTM D3039M14 the elastic modulus was determined in the range from 0.25εmax to 0.5εmax. εmax was defined as the strain corresponding to the maximum tensile stress achieved during testing
The elastic modulus was determined by the four described methods
Summary
Evaluation of the properties of materials during their mechanical testing is an urgent task. Optical systems based on digital image correlation method make it possible to measure strains in a non-contact way with high accuracy [1,2,3]. The principle of evaluating the elastic properties of materials using a system of stereo imaging and the method of digital image correlation is considered. 2. Mathematics Motion detection in Digital Image Correlation Method (DIC) on a series of images in a general form is based on minimizing the functional
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