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Häggblad, Hans-ÅkeORCID iD iconorcid.org/0000-0002-7514-0513
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Publications (10 of 148) Show all publications
Djebien, S., Nohara, S., Nishida, M., Marth, S. & Häggblad, H.-Å. (2023). Strain Rate and Notch Radius Effects on Evaluating the Stress–Strain Relations Using the Stepwise Modeling Method. Journal of Dynamic Behavior of Materials
Open this publication in new window or tab >>Strain Rate and Notch Radius Effects on Evaluating the Stress–Strain Relations Using the Stepwise Modeling Method
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2023 (English)In: Journal of Dynamic Behavior of Materials, ISSN 2199-7446Article in journal (Refereed) Epub ahead of print
National Category
Applied Mechanics Other Materials Engineering
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-103270 (URN)10.1007/s40870-023-00397-4 (DOI)
Note

Funder: The Light Metal Educational Foundation, Inc

Available from: 2023-12-08 Created: 2023-12-08 Last updated: 2023-12-08
Marth, S., Djebien, S., Kajberg, J. & Häggblad, H.-Å. (2021). Stepwise modelling method for post necking characterisation of anisotropic sheet metal. Modelling and Simulation in Materials Science and Engineering, 29(8), Article ID 085001.
Open this publication in new window or tab >>Stepwise modelling method for post necking characterisation of anisotropic sheet metal
2021 (English)In: Modelling and Simulation in Materials Science and Engineering, ISSN 0965-0393, E-ISSN 1361-651X, Vol. 29, no 8, article id 085001Article in journal (Refereed) Published
Abstract [en]

Modelling and simulation are important tools during design and development processes. For accurate predictions of, e.g. manufacturing processes or final product performance, reliable material data is needed. Usually, the applied material models are calibrated by utilising direct methods such as conventional uniaxial tensile/compression tests but also inverse methods are occasionally applied. Recently, an effective inverse method, the stepwise modelling method (SMM), was presented. By using SMM, the flow stress from initial yielding, beyond necking to final fracture, can be determined. However, the method is developed for sheet materials having isotropic von Mises hardening. In this paper the SMM is extended for post necking characterisation of anisotropic sheet metals using the Barlat yield 2000 criterion. The novel method was applied to analyse the post necking plasticity of the widely used aluminium alloy AA6016 in T4 condition and the aluminium alloy AA5754 in H111 condition. The latter alloy has reported to show serrated yielding, also known as the Portevin–Le Chatelier effect. The obtained flow stress curves agree well with the curves form conventional uniaxial tensile tests up to the point of necking and show credible post necking predictions to final fracture. Furthermore, SMM showed that it could handle the effect of serrated yielding for AA5754-H111. Hence, the novel approach can be used to characterise the post necking hardening of a variety of anisotropic sheet metals and thereby contributes to efficient and reliable material model calibration.

Place, publisher, year, edition, pages
Institute of Physics (IOP), 2021
Keywords
Anisotropy, Post necking, Barlat Yield 2000, Stepwise Modelling Method, SMM, AA6016 T4, AA5754 H111
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-87207 (URN)10.1088/1361-651X/ac2797 (DOI)000702062400001 ()2-s2.0-85117469314 (Scopus ID)
Funder
EU, Horizon 2020, 814517Vinnova, 2019-02639
Note

Validerad;2021;Nivå 2;2021-10-01 (alebob)

Available from: 2021-09-24 Created: 2021-09-24 Last updated: 2023-09-05Bibliographically approved
Larsson, S., Rodriguez Prieto, J. M., Gustafsson, G., Häggblad, H.-Å. & Jonsén, P. (2021). The particle finite element method for transient granular material flow: modelling and validation. Computational Particle Mechanics, 8(1), 135-155
Open this publication in new window or tab >>The particle finite element method for transient granular material flow: modelling and validation
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2021 (English)In: Computational Particle Mechanics, ISSN 2196-4378, Vol. 8, no 1, p. 135-155Article in journal (Refereed) Published
Abstract [en]

The prediction of transient granular material flow is of fundamental industrial importance. The potential of using numerical methods in system design for increasing the operating efficiency of industrial processes involving granular material flow is huge. In the present study, a numerical tool for modelling dense transient granular material flow is presented and validated against experiments. The granular materials are modelled as continuous materials using two different constitutive models. The choice of constitutive models is made with the aim to predict the mechanical behaviour of a granular material during the transition from stationary to flowing and back to stationary state. The particle finite element method (PFEM) is employed as a numerical tool to simulate the transient granular material flow. Use of the PFEM enables a robust treatment of large deformations and free surfaces. The fundamental problem of collapsing rectangular columns of granular material is studied experimentally employing a novel approach for in-plane velocity measurements by digital image correlation. The proposed numerical model is used to simulate the experimentally studied column collapses. The model prediction of the in-plane velocity field during the collapse agrees well with experiments.

Place, publisher, year, edition, pages
Springer, 2021
Keywords
Particle finite element method, Transient granular material flow, Constitutive modelling, Strain-rate-dependent strength, Digital image correlation
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-73197 (URN)10.1007/s40571-020-00317-6 (DOI)000515975800001 ()2-s2.0-85079217630 (Scopus ID)
Funder
EU, Horizon 2020, 636520
Note

Validerad;2021;Nivå 2;2021-01-22 (alebob);

Finansiär: KIC RawMaterials (17152)

Available from: 2019-03-14 Created: 2019-03-14 Last updated: 2023-09-05Bibliographically approved
Jonsén, P., Svanberg, A., Ramirez, G., Casellas, D., Hernández, R., Marth, S., . . . Oldenburg, M. (2019). A Novel Method for Modelling of Cold Cutting of Microstructurally Tailored Hot Formed Components. In: Mats Oldenburg, Jens Hardell, Daniel Casellas (Ed.), Hot sheet metal forming of high-performance steel: Proceedings. Paper presented at 7th International Conference on Hot Sheet Metal Forming of High Performance Steel (CHS² 2019), 2-5 June, 2019, Luleå, Sweden (pp. 645-652). Wissenschaftliche Scripten
Open this publication in new window or tab >>A Novel Method for Modelling of Cold Cutting of Microstructurally Tailored Hot Formed Components
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2019 (English)In: Hot sheet metal forming of high-performance steel: Proceedings / [ed] Mats Oldenburg, Jens Hardell, Daniel Casellas, Wissenschaftliche Scripten , 2019, p. 645-652Conference paper, Published paper (Refereed)
Abstract [en]

In the last decade, hot metal forming of advanced high strength steel (AHSS) have improved passenger safety and open possibilities for lightweight design. Hot metal forming can be applied to locally tailor the microstructure of components and gradual vary mechanical properties to improve crash resistance behaviour and optimized weight for e.g. safety related parts. Sometimes post punching or trimming must be done on hardened parts. Such conditions induce damage and fractures in the trimmed edge. Another issue is that high pressures are required in cutting operations due to the high yield stress of press hardened parts, which accelerate wear and produce premature fracture in tools. Optimizing cutting operations to minimize damage and wear are essentials and numerical simulations of cutting operations can be of good assistance. One of the main challenges in the numerical modelling consists of numerically be able to treat the extremely large deformation occurring in the cutting zone. A second challenge is to find suitable failure models. In this work, the punching process of soft and hard microstructures obtained by press hardening is experimentally studied, but also modelled with a combination of smoothed particle Galerkin (SPG) method and finite element method (FEM). Laboratory punching tests with different clearance values were carried out using sheets of different fracture strengths. All experimental cases are numerically modelled. Validation is conducted by comparing numerical results with experimental measurements of punch force and displacement. In addition, morphology of the final cutting edges from both real and virtual are compared. Numerical results show good agreement against experimental measurements. Furthermore, the combined method gives robust-ness and stability as it can handle large deformations efficiently.

Place, publisher, year, edition, pages
Wissenschaftliche Scripten, 2019
Series
CHS²-series ; 7
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-75748 (URN)
Conference
7th International Conference on Hot Sheet Metal Forming of High Performance Steel (CHS² 2019), 2-5 June, 2019, Luleå, Sweden
Note

ISBN för värdpublikation: 978-3-95735-104-3

Available from: 2019-08-29 Created: 2019-08-29 Last updated: 2023-09-05Bibliographically approved
Forouzan, F., Vuorinen, E., Oldenburg, M. & Häggblad, H.-Å. (2019). Application of Quenching and Partitioning Processes to Welding and Press Hardening. In: Mats Oldenburg, Jens Hardell, Daniel Casellas (Ed.), Hot sheet metal forming of high-performance steel: Proceedings. Paper presented at 7th International Conference on Hot Sheet Metal Forming of High Performance Steel (CHS² 2019), 2-5 June, 2019, Luleå, Sweden (pp. 727-735). Wissenschaftliche Scripten
Open this publication in new window or tab >>Application of Quenching and Partitioning Processes to Welding and Press Hardening
2019 (English)In: Hot sheet metal forming of high-performance steel: Proceedings / [ed] Mats Oldenburg, Jens Hardell, Daniel Casellas, Wissenschaftliche Scripten , 2019, p. 727-735Conference paper, Published paper (Refereed)
Abstract [en]

One of the most critical characteristics of welding and press hardening of advanced high strength steels is a low ductility related to a martensitic transformation due to high cooling rate and/or plastic deformation. The present work proposes the application of quenching and partitioning (Q&P) processing to welding and press hardening in a single production step. Using this methodology will not only improve the ductility without losing the ultra-high strength but also accelerate the whole process rate significantly in comparison with austempering treatment in connection to hot pressing and decrease the cost. In this regard, Gleeble simulation of different Q&P cycles beside simulation of deformation at different rates at different temperatures were applied to a medium carbon, Si- alloyed Q&P steel. Samples were characterized using OM, SEM, XRD, hardness, compression and tensile tests. The aim of the project is to establish manufacturing strategies for obtaining components with extreme properties.

Place, publisher, year, edition, pages
Wissenschaftliche Scripten, 2019
Series
CHS²-series ; 7
National Category
Other Materials Engineering Applied Mechanics
Research subject
Engineering Materials; Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-75411 (URN)
Conference
7th International Conference on Hot Sheet Metal Forming of High Performance Steel (CHS² 2019), 2-5 June, 2019, Luleå, Sweden
Note

ISBN för värdpublikation: 978-3-95735-104-3

Available from: 2019-08-06 Created: 2019-08-06 Last updated: 2020-11-11Bibliographically approved
Marth, S., Golling, S., Östlund, R., Barrero Pijoan, A., Häggblad, H.-Å. & Oldenburg, M. (2019). Failure Modelling and Experimental Evaluation of a Press-Hardened Laboratory Scale Component with Multi-Phase Microstructure. In: Mats Oldenburg, Jens Hardell, Daniel Casellas (Ed.), Hot sheet metal forming of high-performance steel: Proceedings. Paper presented at 7th International Conference on Hot Sheet Metal Forming of High Performance Steel (CHS² 2019), 2-5 June, 2019, Luleå, Sweden (pp. 39-49). Wissenschaftliche Scripten
Open this publication in new window or tab >>Failure Modelling and Experimental Evaluation of a Press-Hardened Laboratory Scale Component with Multi-Phase Microstructure
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2019 (English)In: Hot sheet metal forming of high-performance steel: Proceedings / [ed] Mats Oldenburg, Jens Hardell, Daniel Casellas, Wissenschaftliche Scripten , 2019, p. 39-49Conference paper, Published paper (Refereed)
Abstract [en]

Hot stamping of boron alloyed steel has become a standard in the automotive industry for safety relevant body in white components. This process allows the design of complex geometries with superior mechanical properties. Special tool design enables to manufacture components with special properties based on varying microstructures in designated areas. This is a challenge for finite element (FE) simulations of deformation and failure for multi-phase microstructure components.

In the present work, a laboratory scale test component with multi-phase microstructure is studied from blank to fractured component. Using different tool temperatures and adding an air-cooling step before transfer to the press hardening tool, the microstructure of the component is varied. By this, components with four different multi-phase microstructures are produced. These components are tested under tensile deformation until fracture, where force, elongation and the strain field on the components surface are measured.

The laboratory scale test component is evaluated using FE-modelling. The complete production process is modelled starting with the pre-cut austenitized blank, subsequent transfer, air-cooling, forming operation, and the final post-cooling. The resulting multi-phase micro structures are evaluated using manual optical microscope image analysis and compared with the simulated phase composition. Furthermore, the deformation and fracture of the manufactured component under tensional loading is studied using a mean-field homogenization scheme for the multi-phase composition combined with the OPTUS failure model. This finite element investigation is conducted taking the microstructure composition, shape and thickness deviations from the forming simulation into account.

The present work shows the feasibility of modelling methods of the complete process chain for press-hardened components with multi-phase microstructures, from blank to fractured component.

Place, publisher, year, edition, pages
Wissenschaftliche Scripten, 2019
Series
CHS²-series ; 7
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-75739 (URN)
Conference
7th International Conference on Hot Sheet Metal Forming of High Performance Steel (CHS² 2019), 2-5 June, 2019, Luleå, Sweden
Note

ISBN för värdpublikation: 978-3-95735-104-3

Available from: 2019-08-29 Created: 2019-08-29 Last updated: 2023-09-05Bibliographically approved
Larsson, S., Gustafsson, G., Jonsén, P. & Häggblad, H.-Å. (2018). DEM-CFD Simulation of the Effect of Air on Powder Flow During Die Filling. In: ABSTRACTS: 13th World Congress on Computational Mechanics. Paper presented at 13th World Congress on Computational Mechanics (WCCM XIII), July 22-27, 2018, New York, NY, USA (pp. 1695-1695). IACM
Open this publication in new window or tab >>DEM-CFD Simulation of the Effect of Air on Powder Flow During Die Filling
2018 (English)In: ABSTRACTS: 13th World Congress on Computational Mechanics, IACM , 2018, p. 1695-1695Conference paper, Oral presentation with published abstract (Refereed)
Abstract [en]

In the field of powder metallurgy (PM), complex components with complicated shapes can be manufactured. One important step in the PM process is the powder pressing process, where powder is consolidated during a forming operation into a desired shape, normally by applying pressure. During powder pressing, the mechanical properties of powder materials change dramatically. PM manufacturers tend to produce components with shapes of increasing complexity, requiring improved pressing equipment and methods. The most crucial aspect is to control the powder flow during die filling and the final powder density distribution after the filling stage, which has been shown to affect the strength of the final component significantly [1].

To investigate the non-homogeneity of the density of PM components, experimental studies combined with numerical simulations of the die filling stage are exploited.

This work covers the numerical modelling and simulation of die filling. The discrete element method (DEM) [2] was used to model the powder, and computational fluid dynamics (CFD) to model the air. To study the effect of air on powder flow, the DEM was coupled to the CFD using a two-way coupling approach. Experimental measurements with digital speckle photography (DSP) from a previous study [3] were used for comparison with the numerical simulations.

The comparison of the DSP measurements and the numerical simulations showed similar macroscopic flow characteristics. Thus, the adequacy of the proposed DEM-CFD model has been demonstrated in a metal powder die filling operation. The DEM-CFD method has been shown to be an effective method for the numerical simulation of the interaction between powder and air.

 

References

[1]   Zenger, D. & Cai, H. (1997). Handbook of the Common Cracks in Green P/M Compacts. Metal Powder Industries Federation, MPIF. Worcester, USA.

[2]   Cundall, P. A., & Strack, O. D. (1979). A discrete numerical model for granular assemblies. geotechnique, 29(1), 47-65.

[3]   Larsson, S., Gustafsson, G., Jonsén, P. & Häggblad, H.-Å. (2016). Study of Powder Filling Using Experimental and Numerical Methods.  In: World PM2016 Congress & Exhibition, Hamburg, October 9-13, 2016.

Place, publisher, year, edition, pages
IACM, 2018
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-71547 (URN)
Conference
13th World Congress on Computational Mechanics (WCCM XIII), July 22-27, 2018, New York, NY, USA
Note

ISBN för värdpublikation: 978-0-578-40837-8

Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2023-09-05Bibliographically approved
Larsson, S., Gustafsson, G., Häggblad, H.-å. & Jonsén, P. (2018). Experimental and numerical study of potassium chloride flow using smoothed particle hydrodynamics. Minerals Engineering, 116, 88-100
Open this publication in new window or tab >>Experimental and numerical study of potassium chloride flow using smoothed particle hydrodynamics
2018 (English)In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 116, p. 88-100Article in journal (Refereed) Published
Abstract [en]

Materials in granular form are widely used in industry and in the society as a whole. Granular materials can have various behaviours and properties. An accurate prediction of their flow behaviour is important to avoid handling and transportation issues. In this study, the flow behaviour of dry potassium chloride (KCl) in granular form was investigated experimentally and simulated numerically. The aim was to develop numerical tools to predict the flow of KCl in transportation and handling systems and granular material flow in various industrial applications. Two experimental setups were used to quantify the flow of KCl. In the first setup, the collapse of an axisymmetric granular column was investigated. In the second setup, digital image correlation was used to obtain velocity field measurements of KCl during the discharge of a flat-bottomed silo. The two experiments were represented numerically using two-dimensional computational domains. The smoothed particle hydrodynamics method was used for the simulations, and a pressure-dependent, elastic-plastic constitutive model was used to describe the granular materials. The numerical results were compared to the experimental observations, and an adequate qualitative and quantitative agreement was found for the granular column collapse and the silo discharge. Overall, the simulated flow patterns showed adequate agreement with the experimental results obtained in this study and with the observations reported in the literature. The experimental measurements, in combination with the numerical simulations, presented in this study adds to the knowledge of granular material flow prediction. The results of this study highlights the potential of numerical simulation as a powerful tool to increase the knowledge of granular material handling operations.

Place, publisher, year, edition, pages
Elsevier, 2018
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-62669 (URN)10.1016/j.mineng.2017.11.003 (DOI)000424172900012 ()2-s2.0-85033796028 (Scopus ID)
Note

Validerad;2018;Nivå 2;2018-01-25 (andbra)

Available from: 2017-03-24 Created: 2017-03-24 Last updated: 2023-09-05Bibliographically approved
Larsson, S., Nishida, M., Kurano, S., Moroe, T., Gustafsson, G., Häggblad, H.-Å. & Jonsén, P. (2018). Modelling and characterisation of the high-rate behaviour of rock material. In: EPJ Web of Conferences: DYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading. Paper presented at DYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading, September 9-14, 2018, Arcachon, France. , 183, Article ID 01040.
Open this publication in new window or tab >>Modelling and characterisation of the high-rate behaviour of rock material
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2018 (English)In: EPJ Web of Conferences: DYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading, 2018, Vol. 183, article id 01040Conference paper, Published paper (Refereed)
Abstract [en]

For future reliable numerical simulations of impact wear on steel structures caused by rock material, knowledge about the dynamic mechanical properties of rock material is required. This paper describes the experimental and numerical work to investigate the dynamic mechanical properties of diabase (dolerite), a subvolcanic rock material. In this study, diabase from southern Sweden was used. The impact compressive strength of diabase with a density of 2.63 g/cm3 was examined by using the split-Hopkinson pressure bar (Kolsky bar) method. Cylindrical specimens were used, with a diameter of 8.9 mm and a length of 14 mm. To characterise the rock material, uniaxial compression tests were performed, at high strain rates (150 s-1). Using an inverse modelling approach, material parameters for an elastic constitutive model, with a stress-based fracture criterion were determined. The constitutive model was used in a finite element simulation of a high strain rate uniaxial compression test. Results obtained from the numerical model were in line with the experimental results.

National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-71544 (URN)10.1051/epjconf/201818301040 (DOI)000570191100038 ()2-s2.0-85053691363 (Scopus ID)
Conference
DYMAT 2018 - 12th International Conference on the Mechanical and Physical Behaviour of Materials under Dynamic Loading, September 9-14, 2018, Arcachon, France
Available from: 2018-11-12 Created: 2018-11-12 Last updated: 2023-09-05Bibliographically approved
Marth, S., Häggblad, H.-å. & Oldenburg, M. (2017). A comparison between Stepwise Modelling and Inverse Modelling methods for characterization of press hardened sheet metals. In: Mats Oldenburg, Braham Prakash, Kurt Steinhoff (Ed.), 6th International Conference Hot Sheet Metal Forming of High-Performance Steel CHS2: June 4-7 2017, Atlanta, Georgia, USA : proceedings. Paper presented at 6th International Conference Hot Sheet Metal Forming of High-Performance Steel CHS2, Atlanta, Georgia, 4-7 June 2017 (pp. 281-288). Warrendale, PA: Association for Iron & Steel Technology, AIST
Open this publication in new window or tab >>A comparison between Stepwise Modelling and Inverse Modelling methods for characterization of press hardened sheet metals
2017 (English)In: 6th International Conference Hot Sheet Metal Forming of High-Performance Steel CHS2: June 4-7 2017, Atlanta, Georgia, USA : proceedings / [ed] Mats Oldenburg, Braham Prakash, Kurt Steinhoff, Warrendale, PA: Association for Iron & Steel Technology, AIST , 2017, p. 281-288Conference paper, Published paper (Refereed)
Abstract [en]

The demand for weight reduction of cars has increased the number of press hardened sheet metal parts used in the automotive industry. This leads to an increased demand on the precision of simulations of press hardened sheet metals. An accurate prediction of the post-necking behaviour of materials is therefore needed to increase the precision of computer simulations with large deformations, as for example in forming simulations and crash simulations. Especially fracture simulations of press hardened steel parts with tailored properties have a huge demand on precise material models.

Inverse modelling is a common engineering tool to characterize the elasto-plastic behaviour of materials.  Taking experimental data, such as force and displacement data, the material model parameters are optimised until the simulated output reaches a target function.  Then inverse modelling is highly time demanding and needs nonlinear hardening material models. 

Lately a new fast method for post necking characterisation of sheet metals, called the Stepwise Modelling Method (SMM), was presented. This method uses full field measurements to obtain the strain field on the surface of sheet metal tensile specimens.  Furthermore, the stepwise modelling method models an experimental hardening curve in a stepwise process.  This hardening curve is a piecewise linear curve and not restricted to any specific material model.

In this paper SMM is used to characterize the hardening behaviour for thermally treated boron steel.  These results are compared with the results of inverse modelling. Three different material models are used. The comparison shows a minor deviation in the resulting hardening relations between stepwise modelling and inverse modelling. Since the efficiency is an important factor in product development calculation times are taken into account.  Comparing calculation time using SMM is considerably more efficient than using inverse modelling. Furthermore another advantage of SMM is shown in the fact that the piecewise linear hardening curves can be fitted to almost any material model without computational costs.

Place, publisher, year, edition, pages
Warrendale, PA: Association for Iron & Steel Technology, AIST, 2017
Series
CHS2-series ; 6
Keywords
Stepwise modelling, Inverse modelling, Material characterisation, Boron steel, Press hardening, Material modelling
National Category
Manufacturing, Surface and Joining Technology Vehicle Engineering Metallurgy and Metallic Materials Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-62459 (URN)978-1-935117-66-7 (ISBN)
Conference
6th International Conference Hot Sheet Metal Forming of High-Performance Steel CHS2, Atlanta, Georgia, 4-7 June 2017
Available from: 2017-03-13 Created: 2017-03-13 Last updated: 2023-09-05Bibliographically approved
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Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0002-7514-0513

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