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A novel multi-axial pressure sensor probe for measuring triaxial stress states inside soft materials
Mid Sweden University, Faculty of Science, Technology and Media, Department of Quality Management and Mechanical Engineering.ORCID iD: 0000-0003-2964-9500
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2021 (English)In: Sensors, E-ISSN 1424-8220, Vol. 21, no 10, article id 3487Article in journal (Refereed) Published
Abstract [en]

This paper presents the concept, design, construction, and validation of a novel probe based on the hexadic disposition of six pressure sensors suitable for measuring triaxial stress states inside bulky soft materials. The measurement of triaxial stress states inside bulk materials such as brain tissue surrogates is a challenging task needed to investigate internal organs’ stress states and validate FE models. The purpose of the work was the development and validation of a 17 × 17 × 17 mm probe containing six pressure sensors. To do so, six piezoresistive pressure sensors of 6 mm diameter were arranged into an hexad at three cartesian axes and bisecting angles, based on the analytical solution of the stress tensor. The resulting probe was embedded in a soft silicone rubber of known characteristics, calibrated under cyclic compression and shear in three orientations, and statically validated with combined loads. A calibration matrix was computed, and validation tests allowed us to estimate Von Mises stress under combined stress with an error below 6%. Hence, the proposed probe design and method can give indications about the complex stress state developing internally to soft materials under triaxial high-strain fields, opening applications in the analysis of biological models or physical surrogates involving parenchyma organs. 

Place, publisher, year, edition, pages
2021. Vol. 21, no 10, article id 3487
Keywords [en]
Pressure sensor, Shear stress, Soft materials, Stress state, Tissue surrogates
National Category
Civil Engineering Mechanical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-42097DOI: 10.3390/s21103487ISI: 000662591200001PubMedID: 34067759Scopus ID: 2-s2.0-85105811908OAI: oai:DiVA.org:miun-42097DiVA, id: diva2:1557098
Available from: 2021-05-25 Created: 2021-05-25 Last updated: 2022-02-10

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Koptyug, Andrey

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