Mullins effect in polymer large deformation strain gauges

The possibility of making strain gauges with high sensitivity to changes in mechanical stress based on hard elastic films of isotactic polypropylene, with thixotropic polymer softening during cyclic deformation (Patrikeev-Mullins effect) and the “dry crazing” effect, is studied. Three options of rig...

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Bibliographic Details
Published inJournal of polymer research Vol. 30; no. 1
Main Authors Kondratov, Alexander P., Lozitskaya, Anastasiya V., Samokhin, Vyacheslav N., Volinsky, Alex A.
Format Journal Article
LanguageEnglish
Published Dordrecht Springer Netherlands 2023
Springer
Springer Nature B.V
Subjects
Adhesives
Characterization and Evaluation of Materials
Chemistry
Chemistry and Materials Science
Crazing
Deformation
Deformation effects
Elastic deformation
Electric properties
Industrial Chemistry/Chemical Engineering
Isotacticity
Original Paper
Polymer Sciences
Polymers
Polypropylene
Sensitivity
Sensors
Strain gauges
Mullins effect
Polypropylene
Conductive layer
Dry crazing
Strain gauge
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Summary:The possibility of making strain gauges with high sensitivity to changes in mechanical stress based on hard elastic films of isotactic polypropylene, with thixotropic polymer softening during cyclic deformation (Patrikeev-Mullins effect) and the “dry crazing” effect, is studied. Three options of rigid elastic film preparation using isotactic polypropylene for successive deposition of an adhesive layer of a solution of macromolecular compounds and an electrically conductive layer of a graphite dispersion are proposed. The optimal order of operations for manufacturing electrical sensors with high sensitivity to changes in mechanical stress has been established, including preliminary cyclic deformation in the air to form open micropores as a result of “dry crazing”. A mathematical model has been developed, which predicts the mechanical stress and/or the change in mechanical stress of film strain gauges based on the change in the electrical resistance of the conductive layer in the 6–35% strain range with up to 700 relative strain sensitivity.
ISSN:1022-9760
1572-8935
DOI:10.1007/s10965-022-03372-0