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Larsson, S., Pålsson, B., Parian, M. & Jonsén, P. (2020). A novel approach for modelling of physical interactions between slurry, grinding media and mill structure in wet stirred media mills. Minerals Engineering, 148, Article ID 106180.
Open this publication in new window or tab >>A novel approach for modelling of physical interactions between slurry, grinding media and mill structure in wet stirred media mills
2020 (English)In: Minerals Engineering, ISSN 0892-6875, E-ISSN 1872-9444, Vol. 148, article id 106180Article in journal (Refereed) Published
Abstract [en]

Wet comminution is an important process in the mineral processing industry. Modelling of wet comminution in stirred media mills requires the simultaneous modelling of grinding media, a moving internal stirrer, and slurry. In the present study, a novel approach for modelling the physical interactions between slurry, grinding media and mill structure in a stirred media mill is presented. The slurry is modelled with the particle finite element method (PFEM). The grinding media is modelled using the discrete element method (DEM) and the mill structure is modelled using the finite element method (FEM). The interactions between slurry, grinding media and mill structure are modelled by two-way couplings between the PFEM, the DEM and the FEM models. The coupled model of the present study is used to predict the motion of slurry and grinding media, and to calculate the power draw during wet comminution in a pilot scale horizontal stirred media mill. Furthermore, the model is used to compare a Newtonian and a non-Newtonian model of the slurry, where the non-Newtonian model is used to capture experimentally observed shear-thinning. The coupled PFEM-DEM-FEM model preserves the robustness and efficiency of each of the methods and it gives the possibility to use large time increments for the fluid, greatly reducing the computational expense. The coupled model of the present work provide information on the complex dynamics of slurry and grinding media. The numerical model is shown to be a useful tool for increasing the knowledge and understanding of wet comminution in stirred media mills.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Particle finite element method, Discrete element method, Coupled models, Stirred media mills
National Category
Applied Mechanics Metallurgy and Metallic Materials
Research subject
Mineral Processing; Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-73198 (URN)10.1016/j.mineng.2019.106180 (DOI)000517854300023 ()2-s2.0-85077676710 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-02-04 (johcin)

Available from: 2019-03-14 Created: 2019-03-14 Last updated: 2020-04-16Bibliographically approved
Rodríguez, J. M., Larsson, S., Carbonell, J. M. & Jonsén, P. (2020). Dislocation Density Based Flow Stress Model Applied to the PFEM Simulation of Orthogonal Cutting Processes of Ti-6Al-4V. Materials, 13(8), Article ID 1979.
Open this publication in new window or tab >>Dislocation Density Based Flow Stress Model Applied to the PFEM Simulation of Orthogonal Cutting Processes of Ti-6Al-4V
2020 (English)In: Materials, ISSN 1996-1944, E-ISSN 1996-1944, Vol. 13, no 8, article id 1979Article in journal (Refereed) Published
Abstract [en]

Machining of metals is an essential operation in the manufacturing industry. Chip formation in metal cutting is associated with large plastic strains, large deformations, high strain rates and high temperatures, mainly located in the primary and in the secondary shear zones. During the last decades, there has been significant progress in numerical methods and constitutive modeling for machining operations. In this work, the Particle Finite Element Method (PFEM) together with a dislocation density (DD) constitutive model are introduced to simulate the machining of Ti-6Al-4V. The work includes a study of two constitutive models for the titanium material, the physically based plasticity DD model and the phenomenology based Johnson–Cook model. Both constitutive models were implemented into an in-house PFEM software and setup to simulate deformation behaviour of titanium Ti6Al4V during an orthogonal cutting process. Validation show that numerical and experimental results are in agreement for different cutting speeds and feeds. The dislocation density model, although it needs more thorough calibration, shows an excellent match with the results. This paper shows that the combination of PFEM together with a dislocation density constitutive model is an excellent candidate for future numerical simulations of mechanical cutting.

Place, publisher, year, edition, pages
MDPI, 2020
Keywords
Particle Finite Element Method (PFEM), metal cutting processes, Johnson-Cook, dislocation density constitutive model, titanium Ti6Al4V
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-78668 (URN)10.3390/ma13081979 (DOI)
Note

Validerad;2020;Nivå 2;2020-04-27 (johcin)

Available from: 2020-04-25 Created: 2020-04-25 Last updated: 2020-04-27Bibliographically approved
Frómeta, D., Parareda, S., Lara, A., Molas, S., Casellas, D., Jonsén, P. & Calvo, J. (2020). Identification of fracture toughness parameters to understand the fracture resistance of advanced high strength sheet steels. Engineering Fracture Mechanics, 229, Article ID 106949.
Open this publication in new window or tab >>Identification of fracture toughness parameters to understand the fracture resistance of advanced high strength sheet steels
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2020 (English)In: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 229, article id 106949Article in journal (Refereed) Published
Abstract [en]

The fracture toughness of four advanced high strength steel (AHSS) thin sheets is evaluated through different characterization methodologies, with the aim of identifying the most relevant toughness parameters to describe their fracture resistance. The investigated steels are: a Complex Phase steel, a Dual Phase steel, a Trip-Aided Bainitic Ferritic steel and a Quenching and Partitioning steel. Their crack initiation and propagation resistance is assessed by means of J-integral measurements, essential work of fracture tests and Kahn-type tear tests. The results obtained from the different methodologies are compared and discussed, and the influence of different parameters such as specimen geometry or notch radius is investigated. Crack initiation resistance parameters are shown to be independent of the specimen geometry and the testing method. However, significant differences are found in the crack propagation resistance values. The results show that, when there is a significant energetic contribution from necking during crack propagation, the specific essential work of fracture (we) better describes the overall fracture resistance of thin AHSS sheets than JC. In contrast, energy values obtained from tear tests overestimate the crack propagation resistance and provide a poor estimation of AHSS fracture performance. we is concluded to be the most suitable parameter to describe the global fracture behaviour of AHSS sheets and it is presented as a key property for new material design and optimization.

Place, publisher, year, edition, pages
Elsevier, 2020
Keywords
Fracture toughness, J-integral, Essential work of fracture, Kahn tear tests, Advanced high strength steel sheets
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-77937 (URN)10.1016/j.engfracmech.2020.106949 (DOI)2-s2.0-85080882787 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-03-20 (alebob)

Available from: 2020-03-03 Created: 2020-03-03 Last updated: 2020-03-20Bibliographically approved
Rodriguez Prieto, J. M., Carbonell, J. & Jonsén, P. (2020). Numerical Methods for the Modelling of Chip Formation. Archives of Computational Methods in Engineering, 27(2), 387-412
Open this publication in new window or tab >>Numerical Methods for the Modelling of Chip Formation
2020 (English)In: Archives of Computational Methods in Engineering, ISSN 1134-3060, E-ISSN 1886-1784, Vol. 27, no 2, p. 387-412Article in journal (Refereed) Published
Abstract [en]

The modeling of metal cutting has proved to be particularly complex due to the diversity of physical phenomena involved, including thermo-mechanical coupling, contact/friction and material failure. During the last few decades, there has been significant progress in the development of numerical methods for modeling machining operations. Furthermore, the most relevant techniques have been implemented in the relevant commercial codes creating tools for the engineers working in the design of processes and cutting devices. This paper presents a review on the numerical modeling methods and techniques used for the simulation of machining processes. The main purpose is to identify the strengths and weaknesses of each method and strategy developed up-to-now. Moreover the review covers the classical Finite Element Method covering mesh-less methods, particle-based methods and different possibilities of Eulerian and Lagrangian approaches.

Place, publisher, year, edition, pages
Springer, 2020
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-72672 (URN)10.1007/s11831-018-09313-9 (DOI)000519468600003 ()2-s2.0-85058942301 (Scopus ID)
Note

Validerad;2020;Nivå 2;2020-03-18 (alebob)

Available from: 2019-01-24 Created: 2019-01-24 Last updated: 2020-04-02Bibliographically approved
Larsson, S., Rodriguez Prieto, J. M., Gustafsson, G., Häggblad, H.-Å. & Jonsén, P. (2020). The particle finite element method for transient granular material flow: modelling and validation. Computational Particle Mechanics
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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2020 (English)In: Computational Particle Mechanics, ISSN 2196-4378Article in journal (Refereed) Epub ahead of print
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, 2020
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)
Available from: 2019-03-14 Created: 2019-03-14 Last updated: 2020-04-22
Hammarberg, S., Kajberg, J., Larsson, S. & Jonsén, P. (2020). Ultra high strength steel sandwich for lightweight applications. SN Applied Sciences, 2(6), Article ID 1040.
Open this publication in new window or tab >>Ultra high strength steel sandwich for lightweight applications
2020 (English)In: SN Applied Sciences, E-ISSN 2523-3971, Vol. 2, no 6, article id 1040Article in journal (Refereed) Published
Abstract [en]

Methods for reducing weight of structural elements are important for a sustainable society. Over the recent years ultra high strength steel (UHSS) has been a successful material for designing light and strong components. Sandwich panels are interesting structural components to further explore areas where the benefits of UHSS can be utilized. The specific properties of sandwich panels make them suitable for stiffness applications and various cores have been studied extensively. In the present work, bidirectionally corrugated UHSS cores are studied experimentally and numerically. A UHSS core is manufactured by cold rolling and bonded to the skins by welding. Stiffness is evaluated experimentally in three-point bending. The tests are virtually reproduced using the finite element method. Precise discretization of the core requires large amounts of computational power, prolonging lead times for sandwich component development, which in the present work is addressed by homogenization, using an equivalent material formulation. Input data for the equivalent models is obtained by characterizing representative volume elements of the periodic cores under periodic boundary conditions. The homogenized panel reduces the number of finite elements and thus the computational time while maintaining accuracy. Numerical results are validated and agree well with experimental testing. Important findings from experimental and simulation results show that the suggested panels provide superior specific bending stiffness as compared to solid panels. This work shows that lightweight UHSS sandwiches with excellent stiffness properties can be manufactured and modeled efficiently. The concept of manufacturing a UHSS sandwich panel expands the usability of UHSS to new areas.

Place, publisher, year, edition, pages
Springer Nature, 2020
Keywords
UHSS, Sandwich, Lightweight, Modeling, Bidirectional core, Representative volume element (RVE)
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-78844 (URN)10.1007/s42452-020-2773-5 (DOI)
Note

Validerad;2020;Nivå 2;2020-05-14 (alebob)

Available from: 2020-05-11 Created: 2020-05-11 Last updated: 2020-05-14Bibliographically approved
Suarez, L., Jonsén, P. & Hammarberg, S. (2019). A combined modeling approach to capture the physical interactions between pulp, charge and structure in a tumbling. In: : . Paper presented at VI International Conference on Particle-based Methods, Fundamentals and Applications (PARTICLES 2019), 28-30 October, 2019, Barcelona, Spain. International Center for Numerical Methods in Engineering (CIMNE)
Open this publication in new window or tab >>A combined modeling approach to capture the physical interactions between pulp, charge and structure in a tumbling
2019 (English)Conference paper, Oral presentation with published abstract (Refereed)
Place, publisher, year, edition, pages
International Center for Numerical Methods in Engineering (CIMNE), 2019
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-78045 (URN)
Conference
VI International Conference on Particle-based Methods, Fundamentals and Applications (PARTICLES 2019), 28-30 October, 2019, Barcelona, Spain
Available from: 2020-03-13 Created: 2020-03-13 Last updated: 2020-04-28Bibliographically 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.), CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, 2019: . Paper presented at CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, Luleå, Sweden, June 2nd to 5th 2019 (pp. 645-652). , 7
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: CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, 2019 / [ed] Mats Oldenburg, Jens Hardell, Daniel Casellas, 2019, Vol. 7, 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.

National Category
Applied Mechanics
Identifiers
urn:nbn:se:ltu:diva-75748 (URN)
Conference
CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, Luleå, Sweden, June 2nd to 5th 2019
Available from: 2019-08-29 Created: 2019-08-29 Last updated: 2019-08-29
Frómenta, D., Parareda, S., Lara, A., Casellas, D., Pujante, J., Jonsén, P., . . . Oldenburg, M. (2019). Fracture Toughness Evaluation of Thick Press Hardened 22MnB5 Sheets for High Crash Performance Applications in Trucks. In: Mats Oldenburg, Jens Hardell, Daniel Casellas (Ed.), CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, 2019: . Paper presented at CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, Luleå, Sweden, June 2nd to 5th 2019 (pp. 113-121).
Open this publication in new window or tab >>Fracture Toughness Evaluation of Thick Press Hardened 22MnB5 Sheets for High Crash Performance Applications in Trucks
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2019 (English)In: CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, 2019 / [ed] Mats Oldenburg, Jens Hardell, Daniel Casellas, 2019, p. 113-121Conference paper, Published paper (Refereed)
National Category
Applied Mechanics
Identifiers
urn:nbn:se:ltu:diva-75751 (URN)
Conference
CHS² 2019 - 7th International Conference on Hot Sheet Metal Forming of High Performance Steel, Luleå, Sweden, June 2nd to 5th 2019
Available from: 2019-08-29 Created: 2019-08-29 Last updated: 2019-08-29
Svanberg, A. & Jonsén, P. (2019). Full scale modeling and validation of wear in a power shovel bucket. In: Svenska mekanikdagar 2019: Stockholm 11-12 juni. Paper presented at Svenska mekanikdagarna 2019, 11-12 juni, 2019, Stockholm, Sverige (pp. 95-95). Kungliga tekniska högskolan
Open this publication in new window or tab >>Full scale modeling and validation of wear in a power shovel bucket
2019 (English)In: Svenska mekanikdagar 2019: Stockholm 11-12 juni, Kungliga tekniska högskolan, 2019, p. 95-95Conference paper, Oral presentation with published abstract (Other academic)
Place, publisher, year, edition, pages
Kungliga tekniska högskolan, 2019
Keywords
Rope Showel, Modelling, Mining, Transport
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-78062 (URN)
Conference
Svenska mekanikdagarna 2019, 11-12 juni, 2019, Stockholm, Sverige
Projects
Harshwork
Available from: 2020-03-14 Created: 2020-03-14 Last updated: 2020-05-19Bibliographically approved
Organisations
Identifiers
ORCID iD: ORCID iD iconorcid.org/0000-0003-0910-7990

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