2021
DOI: 10.3390/polym13091498
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Measurement of Nonlinear Poisson’s Ratio of Thermoplastic Polyurethanes under Cyclic Softening Using 2D Digital Image Correlation

Abstract: Thermoplastic polyurethanes (TPUs) and other elastomers are widely used in many applications for the advantages they provide in terms of high elasticity, lightness, resistance to breakage, and impact resistance. These materials exhibit strong hysteresis in the large strain stress-strain behavior, known as cyclic softening or the Mullins effect. Despite the extensive studies on this phenomenon and the importance of Poisson’s ratio, how the Poisson’s ratio of these materials changes during cyclic uniaxial tests … Show more

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Cited by 21 publications
(8 citation statements)
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“…On the other hand, when stretched due to transverse strain (TPU has a Poisson’s ratio value greater than 0.4 [ 31 ]), a comprehensive compression of the filler occurs, which is accompanied by an increase in adhesion in the initial deformation area, an increase in friction between the polymer and flakes after the destruction of the adhesion boundary; but in this case, it can lead to damage to the polymer at the points of its contact with the faces of the filler. In this case, a decrease in the thickness of the flake leads to an increase in the number of faces, as well as the surface area, per unit volume of the filler.…”
Section: Resultsmentioning
confidence: 99%
“…On the other hand, when stretched due to transverse strain (TPU has a Poisson’s ratio value greater than 0.4 [ 31 ]), a comprehensive compression of the filler occurs, which is accompanied by an increase in adhesion in the initial deformation area, an increase in friction between the polymer and flakes after the destruction of the adhesion boundary; but in this case, it can lead to damage to the polymer at the points of its contact with the faces of the filler. In this case, a decrease in the thickness of the flake leads to an increase in the number of faces, as well as the surface area, per unit volume of the filler.…”
Section: Resultsmentioning
confidence: 99%
“…[ 11 ] The Young's modulus of TPU and SEBS used in this study are 30.6 and 5.5 MPa, respectively. In addition, Poisson ratio of PEDOT:PSS, TPU, and SEBS are reported as 0.35, [ 23 ] ≈0.45, [ 24 ] and ≈0.49, [ 25 ] respectively. Strain can be more uniformly applied to thin films when the substrates possess similar mechanical properties to the thin films.…”
Section: Engineering Conductivity and Stretchability Of A Conducting ...mentioning
confidence: 99%
“…Crack-free specimens were prepared, according to ASTM D638, for the measurement of single materials’ Young’s moduli. The load data was obtained from the tensile test machine’s readings, and the strain field was measured by a digital image correlation (DIC) system [ 57 ]. To measure the strain field with a DIC system, we first sprayed random black and white speckles on the measured area of specimens.…”
Section: Methodsmentioning
confidence: 99%