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Andersson, Tobias J.
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Publications (10 of 12) Show all publications
Amouzgar, K., Bandaru, S., Andersson, T. & Ng, A. H. C. (2019). Metamodel based multi-objective optimization of a turning process by using finite element simulation. Engineering optimization (Print)
Open this publication in new window or tab >>Metamodel based multi-objective optimization of a turning process by using finite element simulation
2019 (English)In: Engineering optimization (Print), ISSN 0305-215X, E-ISSN 1029-0273Article in journal (Refereed) Epub ahead of print
Abstract [en]

This study investigates the advantages and potentials of the metamodelbased multi-objective optimization (MOO) of a turning operation through the application of finite element simulations and evolutionary algorithms to a metal cutting process. The objectives are minimizing the interface temperature and tool wear depth obtained from FE simulations using DEFORM2D software, and maximizing the material removal rate. Tool geometry and process parameters are considered as the input variables. Seven metamodelling methods are employed and evaluated, based on accuracy and suitability. Radial basis functions with a priori bias and Kriging are chosen to model tool–chip interface temperature and tool wear depth, respectively. The non-dominated solutions are found using the strength Pareto evolutionary algorithm SPEA2 and compared with the non-dominated front obtained from pure simulation-based MOO. The metamodel-based MOO method is not only advantageous in terms of reducing the computational time by 70%, but is also able to discover 31 new non-dominated solutions over simulation-based MOO.

Place, publisher, year, edition, pages
Taylor & Francis Group, 2019
Keywords
Metamodeling, Surrogate models, Machining, Turning, Multi-objective optimization
National Category
Mechanical Engineering
Research subject
Production and Automation Engineering; Virtual Manufacturing Processes
Identifiers
urn:nbn:se:his:diva-17520 (URN)10.1080/0305215X.2019.1639050 (DOI)000477101800001 ()
Available from: 2019-08-12 Created: 2019-08-12 Last updated: 2019-11-06Bibliographically approved
Amouzgar, K., Bandaru, S., Andersson, T. J. & Ng, A. H. C. (2018). A framework for simulation based multi-objective optimization and knowledge discovery of machining process. The International Journal of Advanced Manufacturing Technology, 98(9-12), 2469-2486
Open this publication in new window or tab >>A framework for simulation based multi-objective optimization and knowledge discovery of machining process
2018 (English)In: The International Journal of Advanced Manufacturing Technology, ISSN 0268-3768, E-ISSN 1433-3015, Vol. 98, no 9-12, p. 2469-2486Article in journal (Refereed) Published
National Category
Mechanical Engineering
Research subject
Production and Automation Engineering
Identifiers
urn:nbn:se:his:diva-15136 (URN)10.1007/s00170-018-2360-8 (DOI)000444704300020 ()2-s2.0-85049664435 (Scopus ID)
Available from: 2018-05-09 Created: 2018-05-09 Last updated: 2019-11-18
Stigh, U., Alfredsson, S. K., Andersson, T., Biel, A., Carlberger, T. & Salomonsson, K. (2010). Some aspects of cohesive models and modelling with special application to strength of adhesive layers. International Journal of Fracture, 165(2), 149-162
Open this publication in new window or tab >>Some aspects of cohesive models and modelling with special application to strength of adhesive layers
Show others...
2010 (English)In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 165, no 2, p. 149-162Article in journal (Refereed) Published
Abstract [en]

An overview of recent development of cohesive modelling is given. Cohesive models are discussed in general and specifically for the modelling of adhesive layers. It is argued that most cohesive models model a material volume and not a surface. Detailed microscopic and mesomechanical studies of the fracture process of an engineering epoxy are discussed. These studies show how plasticity on the mesomechanical length scale contributes to the fracture energy in shear dominated load cases. Methods to measure cohesive laws are presented in a general setting. Conclusions and conjectures based on experimental and mesomechanical studies are presented. The influence of temperature and strain rate on the peak stress and fracture energy of cohesive laws indicates fundamentally different mechanisms responsible for these properties. Experiments and mesomechanical studies show that in-plane straining of an adhesive layer can give large contributions to the registered fracture energy. Finite element formulations including a method to incorporate this influence are discussed.

Place, publisher, year, edition, pages
Springer Netherlands, 2010
Keywords
Cohesive modelling, Measurement cohesive law, Fracture energy, Traction-separation, J-integral, Adhesive bond
National Category
Engineering and Technology
Research subject
Technology
Identifiers
urn:nbn:se:his:diva-4146 (URN)10.1007/s10704-010-9458-9 (DOI)000281680600003 ()2-s2.0-77956393829 (Scopus ID)
Available from: 2010-06-16 Created: 2010-06-16 Last updated: 2017-12-12Bibliographically approved
Salomonsson, K. E. & Andersson, T. J. (2010). Weighted Potential Methodology for Mixed Mode Cohesive Laws. In: Eduardo Dvorkin, Marcela Goldschmit, Mario Storti (Ed.), Proceedings of the MECOM DEL BICENTENARIO, IX Argentinian Congress on Computational Mechanics: . Paper presented at MECOM DEL BICENTENARIO: CILAMCE 2010 (XXXI Iberian-Latin-American Congress on Computational Methods in Engineering) and MECOM 2010 (IX Argentine Congress on Computational Mechanics and II South American Congress on Computational Mechanics). Buenos Aires, Argentina, 15-18 November 2010 (pp. 8355-8374). Asociación Argentina de Mecánica Comptacional
Open this publication in new window or tab >>Weighted Potential Methodology for Mixed Mode Cohesive Laws
2010 (English)In: Proceedings of the MECOM DEL BICENTENARIO, IX Argentinian Congress on Computational Mechanics / [ed] Eduardo Dvorkin, Marcela Goldschmit, Mario Storti, Asociación Argentina de Mecánica Comptacional , 2010, p. 8355-8374Conference paper, Published paper (Refereed)
Abstract [en]

A  weighted  potential  methodology  is  developed  by  utilizing  pure  mode  I  and mode  II  energy  release  rate  experiments  to  determine  the  traction-separation  relations  for thin  adhesive  layers.  The  experimentally  measured  energy  release  rates  act  as  boundary conditions  for  developing  a  weighted  potential  function.  Thus,  the  tractions  for  any  mixed mode loading can be established.  Changes of mode mix during an experiment can also be captured  by  the  law  since  every  mixed  mode  variation  is  given  by  the  potential  function. Furthermore,  by  use  of  an  inverse  J-integral  approach  and  damage  type  variables,  the traction-separation  relations  for  any  mode  mix  can  be  approximated  by  use  of  pure  mode experiments.  Numerical  simulations  show  the  applicability  of  the  methodology.  The  results indicate  that  the  methodology  is  promising  when  simulating  the  constitutive  behavior  of adhesive layers.

Place, publisher, year, edition, pages
Asociación Argentina de Mecánica Comptacional, 2010
Series
Mecánica Computacional ; Volume XXIX. Number 85. Modeling of materials for coupled problems (B)
Keywords
Adhesive layer, Cohesive law, Fracture, Mixed-mode
National Category
Engineering and Technology
Research subject
Technology
Identifiers
urn:nbn:se:his:diva-4604 (URN)
Conference
MECOM DEL BICENTENARIO: CILAMCE 2010 (XXXI Iberian-Latin-American Congress on Computational Methods in Engineering) and MECOM 2010 (IX Argentine Congress on Computational Mechanics and II South American Congress on Computational Mechanics). Buenos Aires, Argentina, 15-18 November 2010
Available from: 2011-01-20 Created: 2011-01-20 Last updated: 2017-11-27Bibliographically approved
Salomonsson, K. & Andersson, T. (2008). Modeling and parameter calibration of an adhesive layer at the meso level. Mechanics of materials (Print), 40(1-2), 48-65
Open this publication in new window or tab >>Modeling and parameter calibration of an adhesive layer at the meso level
2008 (English)In: Mechanics of materials (Print), ISSN 0167-6636, E-ISSN 1872-7743, Vol. 40, no 1-2, p. 48-65Article in journal (Refereed) Published
Abstract [en]

A mesomechanical finite element model of a thin adhesive layer is developed. The model is calibrated to previously performed experiments. In these, the adhesive layer is loaded in monotonically increasing peel or shear. An in situ SEM study is also performed and used to guide the modeling and calibration. The purpose of the mesomechanical finite element model is to facilitate the development of constitutive laws for adhesive layers. The modeling is based on Xu and Needleman’s method where all continuum finite elements are surrounded by interface elements that allow for the development of micro cracks. Thus, this enables the modeling of the entire process of degradation and fracture of the adhesive layer. A genetic algorithm is developed for the calibration. The simulations show good agreement with the experiments.

Place, publisher, year, edition, pages
Elsevier ltd., 2008
Keywords
RVE, CZM, Interface, Crack propagation
Identifiers
urn:nbn:se:his:diva-2148 (URN)10.1016/j.mechmat.2007.06.004 (DOI)000250635300004 ()2-s2.0-34548593362 (Scopus ID)
Available from: 2008-06-09 Created: 2008-06-09 Last updated: 2017-12-12Bibliographically approved
Andersson, T. (2006). Mechanical Behaviour of Adhesive Layers: Methods to Extract Peel and Mixed Mode Properties. (Doctoral dissertation). Chalmers tekniska högskola
Open this publication in new window or tab >>Mechanical Behaviour of Adhesive Layers: Methods to Extract Peel and Mixed Mode Properties
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Mechanical Behaviour of Adhesive Layers Methods to Extract Peel and Mixed Mode Properties TOBIAS ANDERSSON Department of Applied Mechanics Chalmers University of Technology ABSTRACT This thesis is concerned with methods to extract material properties of thin adhesive layers loaded in peel and in mixed mode. The first part of the thesis is devoted to an experimental method to determine the complete stress-elongation relation (or cohesive law) for an adhesive layer loaded in peel using the DCB-specimen. The method is based on the concept of equilibrium of the energetic forces acting on the specimen. Two sources of energetic forces are identified: the start of the adhesive layer and the positions of the two acting loads. By use of the concept of equilibrium of energetic forces, it is possible to measure the energy release rate of the adhesive layer instantaneously during an experiment. The complete stress-elongation relation is found to be the derivative of the energy release rate with respect to the elongation of the adhesive layer at its start. By this procedure, an effective property of the adhesive layer is measured. The validity of the approach is investigated by experiments where the adherends deform 1) elastically and 2) plastically. It is found that a unique stress-elongation is obtained when the adherends deform elastically. The same relation cannot be used to predict the experiments where the adherends deform plastically indicating that the approach has limited applicability. The second part of the thesis is concerned with the development of a mesomechanical finite element model of a thin adhesive layer loaded in mixed mode. The model is calibrated to previously performed experiments. In these, the adhesive layer is loaded in monotonically increasing peel or shear. An in situ SEM-study is also performed and used to guide the modelling and calibration. The purpose of the mesomechanical finite element model is to facilitate the development of constitutive laws for adhesive layers. The modelling is based on Xu and Needleman’s method where all continuum finite-elements are surrounded by interface elements that allow for the development of micro cracks. Thus, this enables the modelling of the entire process of degradation and fracture of the adhesive layer. A genetic algorithm is developed for the calibration. The simulations are shown to be in reasonably good agreement with the experiments. Keywords: adhesive layer, stress-elongation relation, J-integral, energetic force, experimental method, RVE, interface elements, genetic algorithm

Place, publisher, year, edition, pages
Chalmers tekniska högskola, 2006. p. 25
Series
Doktorsavhandlingar vid Chalmers tekniska högskola, ISSN 0346-718X ; 2465
National Category
Mechanical Engineering
Research subject
Technology
Identifiers
urn:nbn:se:his:diva-1831 (URN)91-7291-783-0 (ISBN)
Public defence
(English)
Available from: 2007-09-07 Created: 2007-09-07 Last updated: 2017-11-27
Andersson, T. & Biel, A. (2006). On the effective constitutive properties of a thin adhesive layer loaded in peel. International Journal of Fracture, 141(1-2), 227-246
Open this publication in new window or tab >>On the effective constitutive properties of a thin adhesive layer loaded in peel
2006 (English)In: International Journal of Fracture, ISSN 0376-9429, E-ISSN 1573-2673, Vol. 141, no 1-2, p. 227-246Article in journal (Refereed) Published
Abstract [en]

An experimental method to determine the complete stress-elongation relation for a structural adhesive loaded in peel is presented. Experiments are performed on the double cantilever beam specimen, which facilitates a more stable experimental set-up as compared with conventional methods like the butt-joint test. The method is based on the concept of equilibrium of the energetic forces acting on the specimen. Two sources of energetic forces are identified: the start of the adhesive layer and the positions of the two acting loads. By use of the concept of equilibrium of energetic forces, it is possible to measure the energy release rate of the adhesive layer instantaneously during an experiment. The complete stress-elongation relation is found to be the derivative of the energy release rate with respect to the elongation of the adhesive layer at its start. By this procedure, an effective property of the adhesive layer is measured. That is, the fields are assumed to be constant through the thickness of the layer and only vary along the layer. To investigate the validity of this approach, experiments are performed on five different groups of specimens with different dimensions. This leads to large variations in the length of the damage zone at the start of the adhesive layer. Four of the experimental groups are used to determine the stress-elongation relation. This is found to be independent of the geometry. For the remaining experimental group, the adherends deform plastically and simulations are performed with the stress-elongation relation determined from the four elastic groups. It is found that the relation cannot be used to accurately predict the behaviour of the experiments where the adherends deform plastically. This indicates that the stress-elongation relation has limited applicability.

Place, publisher, year, edition, pages
Springer Netherlands, 2006
Keywords
Stress-elongation relation, Adhesive layer, Experimental method, Energetic force, J-integral, Damage zone, Anticlastic deformation
National Category
Engineering and Technology
Research subject
Technology
Identifiers
urn:nbn:se:his:diva-1970 (URN)10.1007/s10704-006-0075-6 (DOI)000243017400017 ()2-s2.0-33845344381 (Scopus ID)
Available from: 2008-04-16 Created: 2008-04-16 Last updated: 2017-12-12Bibliographically approved
Andersson, T. & Salomonsson, K. (2006). Simulation of crack initiation and propagation in an adhesive layer using a mesomechanical model: Polymer Composite Materials for Wind Power Turbines. In: the 27th Risö International Symposium on Material Science (pp. 315-320). Riso National Laboratory
Open this publication in new window or tab >>Simulation of crack initiation and propagation in an adhesive layer using a mesomechanical model: Polymer Composite Materials for Wind Power Turbines
2006 (English)In: the 27th Risö International Symposium on Material Science, Riso National Laboratory , 2006, p. 315-320Conference paper, Published paper (Other academic)
Abstract [en]

A finite element modle of a double cantilever beam specimen is developed. The adherents are modeled using plane strain elastic continuum elements. Furthermore, the adhesive is modeled using a mesomechanical modeling teqnique wich allows for simulation of initiation and prognationb of micro-cracks. This enables the modelling of entire process of degradation and fracture of the adhesive layer. The purpose of the present study is to compare the stress-deformation behavior in an idealized peel loading to the behavior in a double cantilever beam (DCB) specimen where the adhesive layer is deformed wilt a slight gradient along the layer. Previously performed experiments and simulations of the RVE are used as a compariosn to the simulated results.

Place, publisher, year, edition, pages
Riso National Laboratory, 2006
Identifiers
urn:nbn:se:his:diva-1899 (URN)87-550-3528-0 (ISBN)
Available from: 2007-09-19 Created: 2007-09-19 Last updated: 2017-11-27
Andersson, T. & Biel, A. (2004). Effects of the length of the damage zone on the effective constitutive properties of an adhesive layer loaded in peel. In: The 15th European Conference on Fracture: ECF 15.
Open this publication in new window or tab >>Effects of the length of the damage zone on the effective constitutive properties of an adhesive layer loaded in peel
2004 (English)In: The 15th European Conference on Fracture: ECF 15, 2004Conference paper, Published paper (Other academic)
Identifiers
urn:nbn:se:his:diva-1935 (URN)
Available from: 2007-10-08 Created: 2007-10-08 Last updated: 2017-11-27Bibliographically approved
Andersson, T. & Salomonsson, K. (2004). Meso-mechanical modeling of thin adhesive layers. In: The 15th European Conference on Fracture: .
Open this publication in new window or tab >>Meso-mechanical modeling of thin adhesive layers
2004 (English)In: The 15th European Conference on Fracture, 2004Conference paper, Published paper (Other academic)
Abstract [en]

A meso-mechanical finite element model for a thin adhesive layer is developed. The model is calibrated to experimental results where the adhesive layer is loaded in monotonically increasing peel or shear, cf. Andersson and Stigh [1] and Alfredsson et al. [2], and to an in situ SEM study of the fracture process. The purpose of the meso-mechanical finite element model is to facilitate the development of constitutive laws for adhesive layers.

Ideas developed by Needleman [3], where structural continuum elements are bonded by cohesive elements are used as a basis for the finite element mesh. This thus enables micro cracks to propagate along the finite element boundaries.

The simulations are found to be in good agreement with the experiments. The model is also capable of reproducing realistically the deformation observed in both peel [1] and shear [2] experiments.

Identifiers
urn:nbn:se:his:diva-1528 (URN)
Available from: 2007-07-06 Created: 2007-07-06 Last updated: 2017-11-27Bibliographically approved
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