Ulrich Hirn

Univ.-Prof. Dipl.-Ing. Dr.techn.

1990 …2022
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Research Output 1999 2019

2019

A continuum micromechanics approach to the elasticity and strength of planar fiber networks: Theory and application to paper sheets

Godinho, P. M. J. S., Jajcinovic, M., Wagner, L., Vass, V., Fischer, W. J., Bader, T. K., Hirn, U., Bauer, W., Eberhardsteiner, J. & Hellmich, C., 1 May 2019, In : European Journal of Mechanics, A/Solids. 75, p. 516-531 16 p.

Research output: Contribution to journalArticleResearchpeer-review

micromechanics
Micromechanics
Circuit theory
Elasticity
elastic properties

A minimal continuum representation of a transverse isotropic viscoelastic pulp fibre based on micromechanical measurements

Seidlhofer, T., Czibula, C. M., Teichert, C., Payerl, C., Hirn, U. & Ulz, M. H., 2019, In : Mechanics of Materials. 135, p. 149-161 13 p.

Research output: Contribution to journalArticleResearchpeer-review

Pulp
continuums
fibers
Fibers
complex compounds

Effect of mechanically induced micro deformations on extensibility and strength of individual softwood pulp fibers and sheets

Kouko, J., Jajcinovic, M., Fischer, W. J., Ketola, A., Hirn, U. & Retulainen, E., 2019, In : Cellulose. 26, 3, p. 1995-2012

Research output: Contribution to journalArticleResearchpeer-review

Open Access

Evaluating the degree of molecular contact between cellulose fiber surfaces using FRET microscopy

Urstöger, G., Simoes, M. G., Steinegger, A., Schennach, R. & Hirn, U., 1 Jan 2019, In : Cellulose. 26, 12, p. 7037-7050

Research output: Contribution to journalArticleResearchpeer-review

Cellulose
Energy transfer
Microscopic examination
Fibers
Pulp

Material model of pulp fibres

Seidlhofer, T., Hirn, U. & Ulz, M. H., 2019, In : Proceedings in Applied Mathematics and Mechanics . 2 p.

Research output: Contribution to journalArticleResearchpeer-review

Open Access
Pulp
Fibers
Constitutive equations
Plastics
Industry

Multilayer Density Analysis of Cellulose Thin Films

Sampl, C., Niegelhell, K., Reishofer, D., Resel, R., Spirk, S. & Hirn, U., 16 Apr 2019, In : Frontiers in Chemistry. 7, p. 251 251.

Research output: Contribution to journalArticleResearchpeer-review

Cellulose films
Multilayers
Thin films
Cellulose
Atomic force microscopy

Time-dependent mechanical response of paper during web fed high speed inkjet printing

Lahti, J. A., Hirn, U. & Kouko, J., 2019, In : Nordic pulp & paper research journal. 34, 1, p. 107-116

Research output: Contribution to journalArticleResearchpeer-review

Transverse viscoelastic properties of pulp fibers investigated with an atomic force microscopy method

Czibula, C. M., Ganser, C., Seidlhofer, T., Teichert, C. & Hirn, U., 2019, In : Journal of Materials Science. 54, 17, p. 11448–11461

Research output: Contribution to journalArticleResearchpeer-review

Open Access
Pulp
Atomic force microscopy
Atmospheric humidity
Fibers
Water
2018
Open Access
Chitosan
Surface treatment
Drying
Biopolymers
Coatings

Combining adhesive contact mechanics with a viscoelastic material model to probe local material properties by AFM

Ganser, C., Czibula, C. M., Tscharnuter, D., Schöberl, T., Teichert, C. & Hirn, U., 2018, In : Soft matter. 14, p. 140-150

Research output: Contribution to journalArticleResearchpeer-review

Influence of relative humidity on the strength of hardwood and softwood pulp fibres and fibre to fibre joints

Jajcinovic, M., Fischer, W. J., Andreas, M., Bauer, W. & Hirn, U., 2018, In : Cellulose. 25, 4, p. 2681-2690

Research output: Contribution to journalArticleResearchpeer-review

Interaction of industrially relevant cationic starches with cellulose

Niegelhell, K., Chemelli, A., Hobisch, J., Griesser, T., Reiter, H., Hirn, U. & Spirk, S., 2018, In : Carbohydrate Polymers. 179, p. 290-296 7 p.

Research output: Contribution to journalArticleResearchpeer-review

Laboratory simulation of paper mechanical response during high-speed inkjet printing

Lahti, J. A., Kouko, J. & Hirn, U., 2018, Progress in Paper Physics Seminar 2018.

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearch

Liquid penetration into paper - Comparison of measurement technique results and real printout analysis

Krainer, S. & Hirn, U., 4 Sep 2018.

Research output: Contribution to conferenceAbstractResearchpeer-review

Measuring ink spreading and penetration for HSI printing

Krainer, S. & Hirn, U., 2018.

Research output: Contribution to conferencePaperResearchpeer-review

inks
printing
penetration
ultrasonics
liquids

Penetration into paper - industry High Speed Inkjet prints evaluation vs. measurement techniques results

Krainer, S. & Hirn, U., 25 Sep 2018.

Research output: Contribution to conferenceAbstractResearchpeer-review

Short timescale wetting and penetration on paper

Krainer, S. & Hirn, U., 17 May 2018.

Research output: Contribution to conferencePosterResearchpeer-review

Short timescale wetting and penetration on porous sheets measured with ultrasound, direct absorption and contact angle

Krainer, S. & Hirn, U., 2018, In : RSC Advances . 8, 23, p. 12861–12869 8 p.

Research output: Contribution to journalArticleResearchpeer-review

Contact angle
Wetting
Ultrasonics
Liquids
Scanning

Wetting and penetration on paper

Krainer, S. & Hirn, U., 28 Jun 2018.

Research output: Contribution to conferenceAbstractResearchpeer-review

2017

A memory effect in sheet-fed offset printing

Fuchs, W., Dauer, M., Hirn, U. & Bauer, W., 2017, Paper Conference and Trade Show, PaperCon 2017: Renew, Rethink, Redefine the Future. p. 1098 1106 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

File

Cellulose Materials Doctoral Students Conference 2017

Hirn, U., 2017

Research output: Book/ReportAnthologyResearch

Determination of Repulpability of Talc-Filled Biopolymer Dispersion Coatings and Optimization of Repulped Reject for Improved Material Efficiency by Tailoring Coatings

Ovaska, S-S., Mielonen, K., Lyytikäinen, J., Hirn, U. & Backfolk, K., 2017, Tappi PaperCon 2017 Proceedings. p. 36-48

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

File

Failure mechanism for pulp inter-fibre joints

Ulz, M. H., Ebner, T. & Hirn, U., 2017.

Research output: Contribution to conference(Old data) Lecture or PresentationResearchpeer-review

Fiber-Fiber Bond Formation and Failure: Mechanisms and Analytical Techniques

Hirn, U. & Schennach, R., 2017, Advances in pulp and paper research, Oxford 2017: 16th Fundamental Research Symposium, Oxford, September 2017. The Pulp and Paper Fundamental Research Society, Vol. 2. p. 839 - 863

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

File

Investigating the transversal viscoelastic properties of paper fibers by atomic force microscopy

Czibula, C. M., Ganser, C., Tscharnuter, D., Schöberl, T., Teichert, C. & Hirn, U., 2017, The issues in mechanics of pulp and paper materials. Arkhangelsk, p. 74-79

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Linking paper structure to damage distribution and fracture initiation

Lahti, J. A., Dauer, M., Hirn, U. & Keller, D. S., 7 Jun 2017, p. 4-5. 2 p.

Research output: Contribution to conferenceAbstractResearch

LINKING PAPER STRUCTURE TO LOCAL DISTRIBUTION OF DEFORMATION AND DAMAGE

Lahti, J. A., Dauer, M., Keller, D. S. & Hirn, U., Sep 2017, Advances in pulp and paper research, Oxford 2017: 16th Fundamental Research Symposium, Oxford. p. 669-682 13 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

damage
temperature
energy dissipation
distribution
method

Liquid penetraion into porous media

Krainer, S. & Hirn, U., 2017.

Research output: Contribution to conferenceAbstractResearchpeer-review

Material Model for Anisotropic Viscoelasticity at Finite Deformations Applied to Pulp Fibres

Seidlhofer, T., Nov 2017, 105 p.

Research output: ThesisMaster's ThesisResearch

Measuring ink spreading and penetration for high speed inkjet printing

Krainer, S. & Hirn, U., 2017.

Research output: Contribution to conferencePosterResearchpeer-review

Ink
Printing
Insulated gate bipolar transistors (IGBT)
Angle measurement
Contact angle

Using atomic force microscopy to investigate the transversal viscoelastic properties of paper fibers

Czibula, C. M., Ganser, C., Teichert, C. & Hirn, U., 2017.

Research output: Contribution to conference(Old data) Lecture or PresentationResearchpeer-review

2016

12th Minisymposium Verfahrenstechnik at Graz University of Technology

Hirn, U., 2016, Graz: Verlag der Technischen Universität Graz. 274 p.

Research output: Book/ReportAnthologyResearchpeer-review

File

AFM based dynamic mechanical analysis of viscoelastic properties of cellulose fibers

Czibula, C., Ganser, C., Teichert, C. & Hirn, U., 2016.

Research output: Contribution to conference(Old data) Lecture or PresentationResearch

A new test device to analyse the flow resistance and compressive behaviour of fibre mats

Flitsch, J., Bauer, W. & Hirn, U., 2016, In : Nordic pulp & paper research journal. 31, 4, p. 634 640 p., DOI:10.3183/NPPRJ-2016-31-04-p634-640.

Research output: Contribution to journalArticleResearchpeer-review

A Proposed Failure Mechanism for Pulp Fiber-Fiber Joints

Ebner, T., Hirn, U., Fischer, W. J., Schmied, F. J., Schennach, R. & Ulz, M. H., 2016, In : BioResources . 11, 4, p. 9596-9610 15 p.

Research output: Contribution to journalArticleResearchpeer-review

File

Cellulose fibers and bonds - Mechancial and morphological properties of the smallest constituents of the paper network

Fischer, W. J., Jajcinovic, M., Hirn, U. & Bauer, W., Mar 2016.

Research output: Contribution to conference(Old data) Lecture or PresentationResearch

Estimating the area in molecular contact using Förster resonance energy transfer microscopy (FRET)

Urstöger, G. J., Schennach, R. & Hirn, U., 2016, Progress in Paper Physics Seminar 2016. p. 241-244

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Heat of sorption: A comparison between isotherm models and calorimeter measurements of wood pulp

Leuk, P., Schneeberger, M., Hirn, U. & Bauer, W., 2016, In : Drying technology. 34, 5, p. 563-573

Research output: Contribution to journalArticleResearchpeer-review

Humidity dependent mechanical properties of cellulose materials investigated by atomic force microscopy

Ganser, C., Czibula, C., Hirn, U. & Teichert, C., 13 Oct 2016.

Research output: Contribution to conference(Old data) Lecture or PresentationResearch

Influence of different realtive humidity on the strength of individual hardwood and softwood fibres and joints

Jajcinovic, M., Fischer, W. J., Hirn, U. & Bauer, W., 2016, Progress in Paper Physics Seminar 2016. p. 174 179 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Measurements of viscoelasticity and adhesion force of polymer materials with large radius AFM tips

Ganser, C., Czibula, C., Manhart, J., Radl, S., Schlögl, S., Hirn, U. & Teichert, C., 28 Sep 2016.

Research output: Contribution to conference(Old data) Lecture or PresentationResearch

Paper Structure at Different Length Scales and its Influence on Paper Properties

Hirn, U., 2016, 410 p.

Research output: ThesisHabilitationResearch

Strength of individual hardwood fibres and fibre to fibre joints

Jajcinovic, M., Fischer, W. J., Hirn, U. & Bauer, W., 2016, In : Cellulose. 23, 3, p. 2049-2060 12 p.

Research output: Contribution to journalArticleResearchpeer-review

The Volume under Load model for Evaluating Wet Pressing Performance

Leuk, P., Dauer, M. & Hirn, U., 2016, Progress in Paper Physics Seminar 2016 Conference Proceedings . p. 96-97 2 p.

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearch

Untersuchung von Zweiseitigkeiten und Trocknungsspannungen auf das Wölbungsverhalten von Kopierpapieren

Schuller, M., 2016, 96 p.

Research output: ThesisMaster's ThesisResearch

2015

A comparison of five optical surface topography measurement methods

Mettänen, M. & Hirn, U., 2015, In : TAPPI journal. 14, 1, p. 27-37

Research output: Contribution to journalArticleResearchpeer-review

A Memory Effect in Sheet-Fed-Offset Printing

Fuchs, W., Dauer, M., Hirn, U. & Bauer, W., 2015, IARIGAI International Research Conference. ., p. 13-23

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review

Comprehensive analysis of individual pulp fiber bonds quantifies the mechanisms of fiber bonding in paper

Hirn, U. & Schennach, R., 2015, In : Scientific reports. 5, p. 10503- 1-9

Research output: Contribution to journalArticleResearchpeer-review

Determining pulp heat of sorption from isotherm models and calorimeter measurements

Leuk, P., Schneeberger, M. & Hirn, U., 2015, Tokyo Paper 2015, Internationl Paper Physics and Paper Chemistry Conference. ., p. 100-100

Research output: Chapter in Book/Report/Conference proceedingConference contributionResearchpeer-review