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BETA
Lindström, Stefan BORCID iD iconorcid.org/0000-0002-1503-8293
Alternative names
Publications (10 of 60) Show all publications
Benselfelt, T., Nordenström, M., Lindström, S. B. & Wågberg, L. (2019). Explaining the Exceptional Wet Integrity of Transparent Cellulose Nanofibril Films in the Presence of Multivalent Ions: Suitable Substrates for Biointerfaces. Advanced Materials Interfaces, 6(13), Article ID 1900333.
Open this publication in new window or tab >>Explaining the Exceptional Wet Integrity of Transparent Cellulose Nanofibril Films in the Presence of Multivalent Ions: Suitable Substrates for Biointerfaces
2019 (English)In: Advanced Materials Interfaces, ISSN 2196-7350, Vol. 6, no 13, article id 1900333Article in journal (Refereed) Published
Abstract [en]

Cellulose nanofibrils (CNFs) assemble into water‐resilient materials in the presence of multivalent counter‐ions. The essential mechanisms behind these assemblies are ion–ion correlation and specific ion effects. A network model shows that the interfibril attraction indirectly influences the wet modulus by a fourth power relationship to the solidity of the network (Ew ∝ φ4). Ions that induce both ion–ion correlation and specific ion effects significantly reduce the swelling of the films, and due to the nonlinear relationship dramatically increase the wet modulus. Herein, this network model is used to explain the elastoplastic behavior of wet films of 2,2,6,6‐tetramethylpiperidine‐1‐oxyl radical (TEMPO)‐oxidized, carboxymethylated, and phosphorylated CNFs in the presence of different counter‐ions. The main findings are that the aspect ratio of the CNFs influences the ductility of the assemblies, that the bivalency of phosphorylate ligands probably limits the formation of interfibril complexes with divalent ions, and that a higher charge density increases the friction between fibrils by increasing the short‐range attraction from ion–ion correlation and specific ion effects. These findings can be used to rationally design CNF materials for a variety of applications where wet strength, ductility, and transparency are important, such as biomaterials or substrates for bioelectronics.

Place, publisher, year, edition, pages
Wiley-VCH Verlagsgesellschaft, 2019
National Category
Paper, Pulp and Fiber Technology Nano Technology Materials Chemistry
Identifiers
urn:nbn:se:liu:diva-158508 (URN)10.1002/admi.201900333 (DOI)2-s2.0-85065451547 (Scopus ID)
Funder
Knut and Alice Wallenberg Foundation
Available from: 2019-07-02 Created: 2019-07-02 Last updated: 2019-08-12Bibliographically approved
Lindström, S. B. (2019). Föreläsningar i mekanik: statik och dynamik. Linköping: Lindström, Stefan
Open this publication in new window or tab >>Föreläsningar i mekanik: statik och dynamik
2019 (Swedish)Book (Other academic)
Alternative title[en]
Lectures on Engineering Mechanics : Statics and Dynamics
Abstract [sv]

Föreläsningar i mekanik: statik and dynamik är lämplig för grundkurser i mekanik på civilingenjörsprogram. Den ger en koncis och formell beskrivning av mekanikens teoretiska ramverk.

Ett särdrag hos denna lärobok är teorins tydliga indelning i postulat, definitioner and satser med rigorösa härledningar. Läsaren finner stöd i rikliga illustrationer och en korsreferens för varje härledningssteg. För att stärka studenternas duglighet i problemlösning understryks vikten av korrekt utförda friläggningsdiagram.

Place, publisher, year, edition, pages
Linköping: Lindström, Stefan, 2019. p. 154
Keywords
Mekanik, Statik, Dynamik, Partikeldynamik, Stelkroppsdynamik, Teknisk Mekanik
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-159207 (URN)9789198128727 (ISBN)9789198128772 (ISBN)
Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-13Bibliographically approved
Lindström, S. B. (2019). Lectures on engineering mechanics: statics and dynamics. Linköping: Lindström, Stefan
Open this publication in new window or tab >>Lectures on engineering mechanics: statics and dynamics
2019 (English)Book (Other academic)
Alternative title[sv]
Föreläsningar i mekanik : statik och dynamik
Abstract [en]

Lectures on Engineering Mechanics: Statics and Dynamics is suitable for Bachelor's level education at schools of engineering with an academic profile. It gives a concise and formal account of the theoretical framework of elementary Engineering Mechanics.

A distinguishing feature of this textbook is that its content is consistently structured into postulates, definitions and theorems, with rigorous derivations. The reader finds support in a wealth of illustrations and a cross-reference for each deduction. This textbook underscores the importance of properly drawn free-body diagrams to enhance the problem-solving skills of students.

Place, publisher, year, edition, pages
Linköping: Lindström, Stefan, 2019. p. 150
Keywords
Mechanics, Statics, Dynamics, Engineering Mechanics, Applied Mechanics, Mechanical Engineering, Mekanik
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-159205 (URN)9789198128741 (ISBN)9789198128734 (ISBN)
Available from: 2019-08-05 Created: 2019-08-05 Last updated: 2019-08-13Bibliographically approved
Suresh, S., Lindström, S. B., Thore, C.-J., Torstenfelt, B. & Klarbring, A. (2018). An Evolution-Based High-Cycle Fatigue Constraint in Topology Optimization. In: : . Paper presented at EngOpt 2018, Proceedings of the 6th International Conference on Engineering Optimization, Lisboa, Portugal, 17-19 September, 2018 (pp. 844-854). Cham, Switzerland
Open this publication in new window or tab >>An Evolution-Based High-Cycle Fatigue Constraint in Topology Optimization
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2018 (English)Conference paper, Published paper (Refereed)
Abstract [en]

We develop a topology optimization method including high-cycle fatigue as a constraint. The fatigue model is based on a continuous-time approach, which uses the concept of a moving endurance surface as a function of the stress history and back stress evolution. The development of damage only occurs when the stress state lies outside the endurance surface. Furthermore, an aggregation function, which approximates the maximum fatigue damage, is implemented. As the optimization workflow is sensitivity-based, the fatigue sensitivities are determined using an adjoint sensitivity analysis. The capabilities of the presented approach are tested on numerical models where the problem is to maximize the stiffness subject to high-cycle fatigue constraints.

Place, publisher, year, edition, pages
Cham, Switzerland: , 2018
Keywords
Endurance surface, High-cycle fatigue, Topology optimization, Adjoint sensitivity analysis, Aggregation function
National Category
Applied Mechanics
Identifiers
urn:nbn:se:liu:diva-155097 (URN)10.1007/978-3-319-97773-7_73 (DOI)978-3-319-97772-0 (ISBN)978-3-319-97773-7 (ISBN)
Conference
EngOpt 2018, Proceedings of the 6th International Conference on Engineering Optimization, Lisboa, Portugal, 17-19 September, 2018
Funder
Vinnova, 2016-05175EU, Horizon 2020, 738002
Available from: 2019-03-18 Created: 2019-03-18 Last updated: 2019-03-22Bibliographically approved
Lindström, S. B., Uhlin, F., Bjarnegård, N., Gylling, M., Nilsson, K., Svensson, C., . . . Länne, T. (2018). Computer-Aided Evaluation of Blood Vessel Geometry From Acoustic Images. Journal of ultrasound in medicine, 37(4), 1025-1031
Open this publication in new window or tab >>Computer-Aided Evaluation of Blood Vessel Geometry From Acoustic Images
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2018 (English)In: Journal of ultrasound in medicine, ISSN 0278-4297, E-ISSN 1550-9613, Vol. 37, no 4, p. 1025-1031Article in journal (Refereed) Published
Abstract [en]

A method for computer-aided assessment of blood vessel geometries based on shape-fitting algorithms from metric vision was evaluated. Acoustic images of cross sections of the radial artery and cephalic vein were acquired, and medical practitioners used a computer application to measure the wall thickness and nominal diameter of these blood vessels with a caliper method and the shape-fitting method. The methods performed equally well for wall thickness measurements. The shape-fitting method was preferable for measuring the diameter, since it reduced systematic errors by up to 63% in the case of the cephalic vein because of its eccentricity.

Place, publisher, year, edition, pages
Wiley-Blackwell Publishing Inc., 2018
Keywords
blood vessel wall, computer-aided assessment, informatics/image processing, lumen diameter, peripheral vascular, shape fitting
National Category
Clinical Medicine
Identifiers
urn:nbn:se:liu:diva-144016 (URN)10.1002/jum.14439 (DOI)000428445900024 ()29027696 (PubMedID)
Available from: 2018-01-03 Created: 2018-01-03 Last updated: 2018-05-17Bibliographically approved
Alimadadi, M., Lindström, S. B. & Kulachenko, A. (2018). Role of microstructures in the compression response of three-dimensional foam-formed wood fiber networks. Soft Matter, 14, 8945-8955
Open this publication in new window or tab >>Role of microstructures in the compression response of three-dimensional foam-formed wood fiber networks
2018 (English)In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 14, p. 8945-8955Article in journal (Refereed) Published
Abstract [en]

High-porosity, three-dimensional wood fiber networks made by foam forming present experimentally accessible instances of hierarchically structured, athermal fiber networks. We investigate the large deformation compression behavior of these networks using fiber-resolved finite element analyses to elucidate the role of microstructures in the mechanical response to compression. Three-dimensional network structures are acquired using micro-computed tomography and subsequent skeletonization into a Euclidean graph representation. By using a fitting procedure to the geometrical graph data, weare able to identify nine independent statistical parameters needed for the regeneration of artificial networks with the observed statistics. The compression response of these artificially generated networks and the physical network is then investigated using implicit finite element analysis. A direct comparison of the simulation results from the reconstructed and artificial network reveals remarkable differences already in the elastic region. These can neither be fully explained by density scaling, the size effect nor the boundary conditions. The only factor which provides the consistent explanation of the observed difference is the density and fiber orientation nonuniformities; these contribute to strain-localization so that the network becomes more compliant than expected for statistically uniform microstructures. We also demonstrate that the experimentally manifested strain-stiffening of such networks is due to development of new inter-fiber contacts during compression.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2018
National Category
Paper, Pulp and Fiber Technology
Identifiers
urn:nbn:se:liu:diva-152731 (URN)10.1039/c7sm02561k (DOI)000450442300008 ()30398491 (PubMedID)2-s2.0-85056540966 (Scopus ID)
Available from: 2018-11-19 Created: 2018-11-19 Last updated: 2018-12-13Bibliographically approved
Gibaud, T., Perge, C., Lindström, S. B., Taberlet, N. & Manneville, S. (2016). Multiple yielding processes in a colloidal gel under large amplitude oscillatory stress. Soft Matter, 12(6), 1701-1712
Open this publication in new window or tab >>Multiple yielding processes in a colloidal gel under large amplitude oscillatory stress
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2016 (English)In: Soft Matter, ISSN 1744-683X, E-ISSN 1744-6848, Vol. 12, no 6, p. 1701-1712Article in journal (Refereed) Published
Abstract [en]

Fatigue refers to the changes in material properties caused by repeatedly applied loads. It has been widely studied for, e.g., construction materials, but much less has been done on soft materials. Here, we characterize the fatigue dynamics of a colloidal gel. Fatigue is induced by large amplitude oscillatory stress (LAOStress), and the local displacements of the gel are measured through high-frequency ultrasonic imaging. We show that fatigue eventually leads to rupture and fluidization. We evidence four successive steps associated with these dynamics: (i) the gel first remains solid, (ii) it then slides against the walls, (iii) the bulk of the sample becomes heterogeneous and displays solid-fluid coexistence, and (iv) it is finally fully fluidized. It is possible to homogeneously scale the duration of each step with respect to the stress oscillation amplitude sigma_0. The data are compatible with both exponential and power-law scalings with sigma_0, which hints at two possible interpretations of delayed yielding in terms of activated processes or of the Basquin law. Surprisingly, we find that the model parameters behave nonmonotonically as we change the oscillation frequency and/or the gel concentration.

Place, publisher, year, edition, pages
Royal Society of Chemistry, 2016
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-125069 (URN)10.1039/c5sm02587g (DOI)000369750400007 ()26685970 (PubMedID)
Note

Funding agencies:  European Research Council under the European Unions Seventh Framework Program (FP7)/ERC grant [258803]; Institut Universitaire de France; Agence Nationale de la Recherche [ANR-11-PDOC-027]; Bernt Jarmark Foundation

Available from: 2016-02-12 Created: 2016-02-12 Last updated: 2017-11-30
Lindström, S. B. & Thore, C.-J. (2015). 10000 mechanics problems at the press of a button. In: Proceedings of Svenska Mekanikdagar: . Paper presented at Svenska Mekanikdagar 2015 Linköping 10-12 juni (pp. 84). Linköping University
Open this publication in new window or tab >>10000 mechanics problems at the press of a button
2015 (English)In: Proceedings of Svenska Mekanikdagar, Linköping University, 2015, p. 84-Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

Problem solving is at the heart of the mechanics curriculum, and developing problem solving skills is an important learning objective in basic and advanced mechanics courses at the undergraduate level. In alignment with this tradition, written examinations are mainly designed to test problem solving capabilities. Despite the fact that students spend most of their mechanics studies solving mechanics problems, an alarming fraction of them fail the written examination. One possible explanation is that a problem solving infrastructure, e.g. answers to problems and opportunities for collaboration with fellow students, is provided during the study period of courses, but missing during the examination.

Place, publisher, year, edition, pages
Linköping University: , 2015
National Category
Pedagogical Work
Identifiers
urn:nbn:se:liu:diva-122173 (URN)
Conference
Svenska Mekanikdagar 2015 Linköping 10-12 juni
Available from: 2015-10-23 Created: 2015-10-23 Last updated: 2015-10-29Bibliographically approved
Lindström, S., Satha, G. & Klarbring, A. (2015). Extension of Murray's law including nonlinear mechanics of a composite artery wall. Biomechanics and Modeling in Mechanobiology, 14(1), 83-91
Open this publication in new window or tab >>Extension of Murray's law including nonlinear mechanics of a composite artery wall
2015 (English)In: Biomechanics and Modeling in Mechanobiology, ISSN 1617-7959, E-ISSN 1617-7940, Vol. 14, no 1, p. 83-91Article in journal (Refereed) Published
Abstract [en]

A goal function approach is used to derive an extension of Murray’s law that includes effects of nonlinear mechanics of the artery wall. The artery is modeled as a thin-walled tube composed of different species of nonlinear elastic materials that deform together. These materials grow and remodel in a process that is governed by a target state defined by a homeostatic radius and a homeostatic material composition. Following Murray’s original idea, this target state is defined by a principle of minimum work. We take this work to include that of pumping and maintaining blood, as well as maintaining the materials of the artery wall. The minimization is performed under a constraint imposed by mechanical equilibrium. We derive a condition for the existence of a cost-optimal homeostatic state. We also conduct parametric studies using this novel theoretical frame to investigate how the cost-optimal radius and composition of the artery wall depend on flow rate, blood pressure, and elastin content.

Place, publisher, year, edition, pages
Springer Berlin/Heidelberg, 2015
Keywords
Goal function, Murrays law, Constrained mixture theory, Artery
National Category
Mechanical Engineering
Identifiers
urn:nbn:se:liu:diva-113721 (URN)10.1007/s10237-014-0590-8 (DOI)000347250500008 ()24817182 (PubMedID)
Note

At the time for thesis presentation publication was in status: Manuscript

Funding Agencies|Swedish Research Council [621-2012-3117]

Available from: 2015-01-30 Created: 2015-01-29 Last updated: 2017-12-05Bibliographically approved
Perge, C., Lindström, S. B., Taberlet, N., Gibaud, T. & Manneville, S. (2015). Large amplitude oscillatory stress and fatigue in colloidal gels. In: Proceedings of 10th Annual European Rheology Conference: . Paper presented at 10th Annual European Rheology Conference, Nantes, France.
Open this publication in new window or tab >>Large amplitude oscillatory stress and fatigue in colloidal gels
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2015 (English)In: Proceedings of 10th Annual European Rheology Conference, 2015Conference paper, Oral presentation only (Other academic)
National Category
Condensed Matter Physics
Identifiers
urn:nbn:se:liu:diva-122174 (URN)
Conference
10th Annual European Rheology Conference, Nantes, France
Available from: 2015-10-23 Created: 2015-10-23 Last updated: 2015-10-29
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-1503-8293

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