Measurement of axial and shear mechanical response of PDMS elastomers and determination of Poisson's ratio using digital image correlation
Measurement of stress-strain response under different deformation modes is important for developing constitutive models of soft polymers. However, such measurements on soft and compliant polymers are challenging using traditional techniques due to generation of unwanted stress concentrations leading...
Saved in:
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2025-02-01
|
| Series: | Polymer Testing |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0142941825000017 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841553919696699392 |
|---|---|
| author | Satya Pal Abir Bhattacharyya |
| author_facet | Satya Pal Abir Bhattacharyya |
| author_sort | Satya Pal |
| collection | DOAJ |
| description | Measurement of stress-strain response under different deformation modes is important for developing constitutive models of soft polymers. However, such measurements on soft and compliant polymers are challenging using traditional techniques due to generation of unwanted stress concentrations leading to premature failure during loading. In this study, a non-contact digital image correlation (DIC) technique along with a novel experimental setup were used to accurately measure the strain field on a specimen surface subjected to finite strain. Polydimethylsiloxane (PDMS) elastomers of three different base polymer to hardener ratio were characterized under three different deformation modes— uniaxial compression, uniaxial tension, and simple shear—over strain rates ranging between 10−3/s–10−1/s. The resulting strain fields exhibited uniformity across all the deformation modes up to finite strains. While the lower strain rate experiments are minimally affected by strain acceleration and inertia effects, the specimens loaded under higher strain rate (10−1/s) are initially affected by strain acceleration during loading, which precluded reliable determination of Young's moduli and shear moduli from the initial slope of the stress-strain responses. The Poisson's ratio calculated from the ratio between measured axial and lateral strains was close to 0.5 at small strains, and exhibited a close match with that calculated from Young's modulus (E) to shear modulus (G) ratio (E/G), validating linear elasticity theory at small strains. The tangent moduli for all the compositions were found to be practically strain-rate insensitive in the region of steady strain rate. |
| format | Article |
| id | doaj-art-c019b7c9b725478a88af28c5d8e428b4 |
| institution | Kabale University |
| issn | 1873-2348 |
| language | English |
| publishDate | 2025-02-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Polymer Testing |
| spelling | doaj-art-c019b7c9b725478a88af28c5d8e428b42025-01-09T06:12:11ZengElsevierPolymer Testing1873-23482025-02-01143108687Measurement of axial and shear mechanical response of PDMS elastomers and determination of Poisson's ratio using digital image correlationSatya Pal0Abir Bhattacharyya1Department of Metallurgical and Materials Engineering, Indian Institute of Technology Jodhpur, Karwar, Rajasthan 342030, IndiaCorresponding author.; Department of Metallurgical and Materials Engineering, Indian Institute of Technology Jodhpur, Karwar, Rajasthan 342030, IndiaMeasurement of stress-strain response under different deformation modes is important for developing constitutive models of soft polymers. However, such measurements on soft and compliant polymers are challenging using traditional techniques due to generation of unwanted stress concentrations leading to premature failure during loading. In this study, a non-contact digital image correlation (DIC) technique along with a novel experimental setup were used to accurately measure the strain field on a specimen surface subjected to finite strain. Polydimethylsiloxane (PDMS) elastomers of three different base polymer to hardener ratio were characterized under three different deformation modes— uniaxial compression, uniaxial tension, and simple shear—over strain rates ranging between 10−3/s–10−1/s. The resulting strain fields exhibited uniformity across all the deformation modes up to finite strains. While the lower strain rate experiments are minimally affected by strain acceleration and inertia effects, the specimens loaded under higher strain rate (10−1/s) are initially affected by strain acceleration during loading, which precluded reliable determination of Young's moduli and shear moduli from the initial slope of the stress-strain responses. The Poisson's ratio calculated from the ratio between measured axial and lateral strains was close to 0.5 at small strains, and exhibited a close match with that calculated from Young's modulus (E) to shear modulus (G) ratio (E/G), validating linear elasticity theory at small strains. The tangent moduli for all the compositions were found to be practically strain-rate insensitive in the region of steady strain rate.http://www.sciencedirect.com/science/article/pii/S0142941825000017PDMSElastomerPoisson's ratioStrain rate sensitivityDigital image correlationSimple shear |
| spellingShingle | Satya Pal Abir Bhattacharyya Measurement of axial and shear mechanical response of PDMS elastomers and determination of Poisson's ratio using digital image correlation Polymer Testing PDMS Elastomer Poisson's ratio Strain rate sensitivity Digital image correlation Simple shear |
| title | Measurement of axial and shear mechanical response of PDMS elastomers and determination of Poisson's ratio using digital image correlation |
| title_full | Measurement of axial and shear mechanical response of PDMS elastomers and determination of Poisson's ratio using digital image correlation |
| title_fullStr | Measurement of axial and shear mechanical response of PDMS elastomers and determination of Poisson's ratio using digital image correlation |
| title_full_unstemmed | Measurement of axial and shear mechanical response of PDMS elastomers and determination of Poisson's ratio using digital image correlation |
| title_short | Measurement of axial and shear mechanical response of PDMS elastomers and determination of Poisson's ratio using digital image correlation |
| title_sort | measurement of axial and shear mechanical response of pdms elastomers and determination of poisson s ratio using digital image correlation |
| topic | PDMS Elastomer Poisson's ratio Strain rate sensitivity Digital image correlation Simple shear |
| url | http://www.sciencedirect.com/science/article/pii/S0142941825000017 |
| work_keys_str_mv | AT satyapal measurementofaxialandshearmechanicalresponseofpdmselastomersanddeterminationofpoissonsratiousingdigitalimagecorrelation AT abirbhattacharyya measurementofaxialandshearmechanicalresponseofpdmselastomersanddeterminationofpoissonsratiousingdigitalimagecorrelation |