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Jonsson, Mikael
Publications (10 of 38) Show all publications
Tinnsten, M., Carlsson, P. & Jonsson, M. (2002). Stochastic optimization of acoustic response: a numerical and experimental comparison (ed.). Paper presented at . Structural and multidisciplinary optimization (Print), 23(6), 405-411
Open this publication in new window or tab >>Stochastic optimization of acoustic response: a numerical and experimental comparison
2002 (English)In: Structural and multidisciplinary optimization (Print), ISSN 1615-147X, E-ISSN 1615-1488, Vol. 23, no 6, p. 405-411Article in journal (Refereed) Published
Abstract [en]

The objective of the work presented is to compare results from numerical optimization with experimental data and to highlight and discuss the differences between two fundamentally different optimization methods. The problem domain is minimization of acoustic emission and the structure used in the work is a closed cylinder with forced vibration of one end. The optimization method used in this paper is simulated annealing (SA), a stochastic method. The results are compared with those from a gradient-based method used on the same structure in an earlier paper (see Tinnsten 2000).

National Category
Other Mechanical Engineering
Research subject
Computer Aided Design
Identifiers
urn:nbn:se:ltu:diva-11159 (URN)10.1007/s00158-002-0202-6 (DOI)000177225900001 ()2-s2.0-0036649740 (Scopus ID)a110a340-770b-11dc-80da-000ea68e967b (Local ID)a110a340-770b-11dc-80da-000ea68e967b (Archive number)a110a340-770b-11dc-80da-000ea68e967b (OAI)
Note
Validerad; 2002; 20071010 (kirhon)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Andersson, M., Jonsson, M. & Söderlund, A. (2002). The Greenhouse learning concept: a new pedagogical approach (ed.). In: (Ed.), (Ed.), The Renaissance engineer of tomorrow: proceedings of the 30th SEFI annual conference. Paper presented at European Society for Engineering Education (Annual conference) : 17/12/2002.
Open this publication in new window or tab >>The Greenhouse learning concept: a new pedagogical approach
2002 (English)In: The Renaissance engineer of tomorrow: proceedings of the 30th SEFI annual conference, 2002Conference paper, Published paper (Refereed)
National Category
Other Mechanical Engineering Pedagogy
Research subject
Computer Aided Design; Education
Identifiers
urn:nbn:se:ltu:diva-40072 (URN)f0d6d840-2afc-11dd-8657-000ea68e967b (Local ID)f0d6d840-2afc-11dd-8657-000ea68e967b (Archive number)f0d6d840-2afc-11dd-8657-000ea68e967b (OAI)
Conference
European Society for Engineering Education (Annual conference) : 17/12/2002
Note
Godkänd; 2002; 20080526 (cira)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Troive, L., Näsström, M. & Jonsson, M. (1998). Experimental and numerical study of multi-pass welding process of pipe-flange joints (ed.). Paper presented at . Journal of Pressure Vessel Technology-Transactions of the ASME, 120(3), 244-251
Open this publication in new window or tab >>Experimental and numerical study of multi-pass welding process of pipe-flange joints
1998 (English)In: Journal of Pressure Vessel Technology-Transactions of the ASME, ISSN 0094-9930, E-ISSN 1528-8978, Vol. 120, no 3, p. 244-251Article in journal (Refereed) Published
Abstract [en]

Residual deformations of pipe-flange joints due to thermal strains caused by the multi-pass welding procedure in a manufacturing process are investigated both experimentally and numerically (FEM). To avoid any risk of leakage between two mounted pipes using flange joints, geometrical distortions (twisting) of the flange must be prevented. How the flange is distorted depends both on the groove shape and the weld sequence used However, to be spared from machine work after the welding process, the distortions have to be minimized. A casting-technique has been developed in order to measure the twisting of the flange after each weld pass. Also, measurements of the residual radial deflection of the pipe have been performed.

National Category
Other Mechanical Engineering
Research subject
Computer Aided Design
Identifiers
urn:nbn:se:ltu:diva-7428 (URN)10.1115/1.2842053 (DOI)000075511200006 ()2-s2.0-0032140060 (Scopus ID)5ce371d0-77c3-11dc-80da-000ea68e967b (Local ID)5ce371d0-77c3-11dc-80da-000ea68e967b (Archive number)5ce371d0-77c3-11dc-80da-000ea68e967b (OAI)
Note
Godkänd; 1998; 20071011 (kirhon)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Karlsson, L., Lindgren, L.-E., Jonsson, M., Josefson, L. & Oddy, A. (1997). Modeling of residual stresses and distortion development (ed.). In: (Ed.), H. Cerjak (Ed.), Mathematical modelling of weld phenomena 3: (pp. 571-589). Paper presented at . London: Institute of Materials
Open this publication in new window or tab >>Modeling of residual stresses and distortion development
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1997 (English)In: Mathematical modelling of weld phenomena 3, London: Institute of Materials , 1997, p. 571-589Chapter in book (Other academic)
Abstract [en]

Four examples are used to illustrate the current ability to calculate residual stress and distortion in situations of varying complexity. The methodology used is capable of allowing for interactions between thermal, mechanical, and transformation processes. Experimental values for a 2.25Cr-1Mo ferritic stainless steel were used in the simulation. It seems possible to simulate most welding situations given sufficient computer resources

Place, publisher, year, edition, pages
London: Institute of Materials, 1997
Series
Materials modelling series, ISSN 1352-9692
National Category
Other Mechanical Engineering Other Materials Engineering
Research subject
Computer Aided Design; Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-19995 (URN)0ee6b400-abdf-11dd-a7c5-000ea68e967b (Local ID)1-86125-010-X (ISBN)0ee6b400-abdf-11dd-a7c5-000ea68e967b (Archive number)0ee6b400-abdf-11dd-a7c5-000ea68e967b (OAI)
Note
Godkänd; 1997; Bibliografisk uppgift: This volume contains the papers presented at the third International Meeting on the 'Numerical Analysis of Weldability' organised under the auspices of the International Institute of Welding ... at Graz University of Technology; 20081106 (andbra)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2017-11-24Bibliographically approved
Oldenburg, M., Sandberg, L., Bergman, G. & Jonsson, M. (1996). Experiments with one-sided spray-cooling of steel plates for evaluation of thermo-mechanical material models (ed.). In: (Ed.), George E. Totten (Ed.), Quenching and the control of distortion: proceedings of the 2nd International Conference on Quenching and the Control of Distortion, 4 - 7 November 1996, Cleveland Marriott Society Center, Cleveland, Ohio. Paper presented at International Conference on Quenching and Control of Distortion : 04/11/1996 - 07/11/1996 (pp. 267-273). Materials Park, Ohio: ASM International
Open this publication in new window or tab >>Experiments with one-sided spray-cooling of steel plates for evaluation of thermo-mechanical material models
1996 (English)In: Quenching and the control of distortion: proceedings of the 2nd International Conference on Quenching and the Control of Distortion, 4 - 7 November 1996, Cleveland Marriott Society Center, Cleveland, Ohio / [ed] George E. Totten, Materials Park, Ohio: ASM International, 1996, p. 267-273Conference paper, Published paper (Refereed)
Abstract [en]

The quenching process of thin plates is studied. In many industrial applications of quenching, there is a need for simple tests for evaluation of analysis methods and material models for simulations. The presented study is part of a program for the simulation of the combined pressing and quenching process of thin-walled structures. This type of manufacturing process is used in, e.g., the production of side-impact protection beams for cars. By the use of an experiment with one-sided spray-cooling of a thin strip, large deformations can be studied and followed in time. The prediction of the deformation of the strip can be regarded as a one-dimensional problem where the curvature of the strip is sought. The thermo-mechanical behavior of the material can be evaluated throughout the time-history of the tests. In order to match the deformation of the plate, the material model must predict the temperature distribution through the thickness of the plate in each point in time, the phase transformations taking place in each layer of the thin plate and the stress and strain components in each layer. Experiments have been performed with a material (Inconel 600) without phase transformations in the actual temperature and time scale and with a material with only martensitic transformations. Analyses with a thermo-elastic-plastic material model with transformation plasticity included have been performed

Place, publisher, year, edition, pages
Materials Park, Ohio: ASM International, 1996
National Category
Other Mechanical Engineering Applied Mechanics
Research subject
Computer Aided Design; Solid Mechanics
Identifiers
urn:nbn:se:ltu:diva-37017 (URN)ae41c1a0-faf8-11db-b816-000ea68e967b (Local ID)0-87170-584-2 (ISBN)ae41c1a0-faf8-11db-b816-000ea68e967b (Archive number)ae41c1a0-faf8-11db-b816-000ea68e967b (OAI)
Conference
International Conference on Quenching and Control of Distortion : 04/11/1996 - 07/11/1996
Note
Godkänd; 1996; 20070505 (cira)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved
Troive, L., Lindgren, L.-E. & Jonsson, M. (1995). Axial collapse load of a girth butt-welded pipe (ed.). In: (Ed.), (Ed.), Thermal stresses '95: proceedings of the First International Symposium on Thermal Stresses and Related Topics, June 5 - 7, 1995, Shizoka University. Paper presented at International Symposium on Thermal Stresses and Related Topics : 05/06/1995 - 07/06/1995 (pp. 565-568). : Shizuoka University
Open this publication in new window or tab >>Axial collapse load of a girth butt-welded pipe
1995 (English)In: Thermal stresses '95: proceedings of the First International Symposium on Thermal Stresses and Related Topics, June 5 - 7, 1995, Shizoka University, Shizuoka University , 1995, p. 565-568Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Shizuoka University, 1995
National Category
Other Materials Engineering Other Mechanical Engineering
Research subject
Material Mechanics; Computer Aided Design
Identifiers
urn:nbn:se:ltu:diva-27139 (URN)07b8eea0-1c29-11dd-8384-000ea68e967b (Local ID)07b8eea0-1c29-11dd-8384-000ea68e967b (Archive number)07b8eea0-1c29-11dd-8384-000ea68e967b (OAI)
Conference
International Symposium on Thermal Stresses and Related Topics : 05/06/1995 - 07/06/1995
Note
Godkänd; 1995; 20080507 (cira)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Troive, L. & Jonsson, M. (1994). Numerical and experimental study of residual deformations due to double-J multi-pass butt-welding of a pipe-flange joint (ed.). In: (Ed.), Yasser A. Hosni (Ed.), Proceedings of the First International IEMS Conference: Cocoa Beach, Florida, USA, March 14 - 16, 1994 / 1994 Annual International Conference on Industry, Engineering, and Management Systems. Paper presented at International Conference on Industry, Engineering, and Management Systems : 14/03/1994 - 16/03/1994 (pp. 107-114).
Open this publication in new window or tab >>Numerical and experimental study of residual deformations due to double-J multi-pass butt-welding of a pipe-flange joint
1994 (English)In: Proceedings of the First International IEMS Conference: Cocoa Beach, Florida, USA, March 14 - 16, 1994 / 1994 Annual International Conference on Industry, Engineering, and Management Systems / [ed] Yasser A. Hosni, 1994, p. 107-114Conference paper, Published paper (Refereed)
National Category
Other Mechanical Engineering
Research subject
Computer Aided Design
Identifiers
urn:nbn:se:ltu:diva-32036 (URN)66659e10-1c2b-11dd-8384-000ea68e967b (Local ID)66659e10-1c2b-11dd-8384-000ea68e967b (Archive number)66659e10-1c2b-11dd-8384-000ea68e967b (OAI)
Conference
International Conference on Industry, Engineering, and Management Systems : 14/03/1994 - 16/03/1994
Note
Godkänd; 1994; 20080507 (cira)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved
Lindgren, L.-E., Carlestam, A. & Jonsson, M. (1993). Computational model of flame-cutting (ed.). Paper presented at . Journal of engineering materials and technology, 115(4), 440-445
Open this publication in new window or tab >>Computational model of flame-cutting
1993 (English)In: Journal of engineering materials and technology, ISSN 0094-4289, E-ISSN 1528-8889, Vol. 115, no 4, p. 440-445Article in journal (Refereed) Published
Abstract [en]

A computational model for simulation of flame-cutting has been developed. Two different cutting conditions are compared with respect to the residual stresses. The first case is a plate cut at room temperature and the other is the cutting of a preheated plate. The model depends on measured micro-structure to estimate the required heat input. The model is verified by comparing the calculations for the preheated plate with experimentally obtained residual stresses. Lower residual stresses in the preheated plate prevents subsequent cracking

National Category
Other Mechanical Engineering Other Materials Engineering
Research subject
Computer Aided Design; Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-12439 (URN)10.1115/1.2904243 (DOI)A1993ME17200018 ()2-s2.0-0027677583 (Scopus ID)b9676260-bb5b-11db-b560-000ea68e967b (Local ID)b9676260-bb5b-11db-b560-000ea68e967b (Archive number)b9676260-bb5b-11db-b560-000ea68e967b (OAI)
Note
Godkänd; 1993; 20061121 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Jonsson, M., Josefson, B. & Näsström, M. (1993). Experimentally determined deformations and stresses in narrow-gap and single-U multi-pass butt-welded pipes (ed.). Paper presented at . Journal of Offshore Mechanics and Arctic Engineering-Transactions of The Asme, 115(2), 116-122
Open this publication in new window or tab >>Experimentally determined deformations and stresses in narrow-gap and single-U multi-pass butt-welded pipes
1993 (English)In: Journal of Offshore Mechanics and Arctic Engineering-Transactions of The Asme, ISSN 0892-7219, E-ISSN 1528-896X, Vol. 115, no 2, p. 116-122Article in journal (Refereed) Published
Abstract [en]

This paper describes a study of the multi-pass butt-welding of thick-walled pipes. Two different groove shapes were used: single-U and narrow-gap grooves. Strains were measured on both the pipe outer and inner surfaces during and after welding. Residual stresses and radial deflections were measured on the outer surface after welding. Measured parameters of the two different groove shapes are compared and discussed. Residual stresses at the weld center and radial deflections in the narrow-gap pipe were somewhat larger than those in the single-U pipe. The residual stress fields of both types of groove were found to be rotationally nonsymmetrical. The experimentally obtained residual stresses and radial deflections are compared with corresponding analytical and empirical results based on methods described in the literature and with numerical results for the same pipe from a separate study. Deviations between the measurements presented in this study and published results are discussed.

National Category
Other Mechanical Engineering
Research subject
Computer Aided Design
Identifiers
urn:nbn:se:ltu:diva-15642 (URN)10.1115/1.2920100 (DOI)2-s2.0-0027595174 (Scopus ID)f2e78360-bb53-11db-b560-000ea68e967b (Local ID)f2e78360-bb53-11db-b560-000ea68e967b (Archive number)f2e78360-bb53-11db-b560-000ea68e967b (OAI)
Note
Godkänd; 1993; 20061121 (cira)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved
Josefson, B., Karlsson, L., Lindgren, L.-E. & Jonsson, M. (1993). Thermo-mechanical FE-analysis of butt-welding of a Cu-Fe canister for spent nuclear fuel (ed.). In: (Ed.), (Ed.), Structural mechanics in reactor technology: transactions of the 12th International Conference on Structural Mechanics in Reactor Technology, Stuttgart, Germany, 15-20 August 1993. Paper presented at International Conference on Structural Mechanics in Reactor Technology : 15/08/1993 - 20/08/1993. Amsterdam: Elsevier
Open this publication in new window or tab >>Thermo-mechanical FE-analysis of butt-welding of a Cu-Fe canister for spent nuclear fuel
1993 (English)In: Structural mechanics in reactor technology: transactions of the 12th International Conference on Structural Mechanics in Reactor Technology, Stuttgart, Germany, 15-20 August 1993, Amsterdam: Elsevier, 1993Conference paper, Published paper (Refereed)
Place, publisher, year, edition, pages
Amsterdam: Elsevier, 1993
National Category
Other Mechanical Engineering Other Materials Engineering
Research subject
Computer Aided Design; Material Mechanics
Identifiers
urn:nbn:se:ltu:diva-38670 (URN)d1f20c70-1c2d-11dd-8384-000ea68e967b (Local ID)0-444-81515-5 (ISBN)d1f20c70-1c2d-11dd-8384-000ea68e967b (Archive number)d1f20c70-1c2d-11dd-8384-000ea68e967b (OAI)
Conference
International Conference on Structural Mechanics in Reactor Technology : 15/08/1993 - 20/08/1993
Note
Godkänd; 1993; 20080507 (cira)Available from: 2016-10-03 Created: 2016-10-03 Last updated: 2017-11-25Bibliographically approved

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