Teräsrakenteet, julkaisut 

Tieteellisiä julkaisuja
Publications 

2010 Konetekniikan osaston julkaisut, Publications of Department

2009 Konetekniikan osaston julkaisut, Publications of Department

2008 Konetekniikan osaston julkaisut, Publications of Department

2007 Konetekniikan osaston julkaisut, Publications of Department

2006 Konetekniikan osaston julkaisut , Publications of Deparment 

2005 Konetekniikan osaston julkaisut, Publications of Deparment

2004 Konetekniikan osaston julkaisut, Publications of Deparment

2003 Konetekniikan osaston julkaisut, Publications.

2002 Konetekniikan osaston julkaisut, Publications.

2001 Konetekniikan osaston julkaisut, Publications.

Marquis, G., A review of multiaxial fatigue of weldments:   experimental results, design code and critical plane approaches. Fatigue and Fracture of Engineering Materials and Structures 24(2001)10. ISSN:   8756-758X. UK. 14 p.

Marquis, G., Effect of mean stress changes on the fatigue strength of spectrum loaded welds. - Proceedings 8th International symposium on practical design of ships and other floating structures (PRADS 2001, Amsterdam. 7 s.

Marquis, G., Evaluation of Interaction Equations for Multiaxial Loaded Welded Structures. - Proceedings of  the Sixth international conference on biaxial/multiaxial fatigue and fracture, Lisbon, Portugal. M. M. de Freitas (ed.). 2001. pp. 65-73.

Marquis, G., Long-Life Multiaxial Fatigue of SG Cast Iron. - Proceedings of   the Sixth international conference on biaxial/multiaxial fatigue and fracture, Lisbon, Portugal. M. M. de Freitas (ed.). 2001. pp. 151-159.

Marquis, G., Scatter in the Fatigue Limit of Nodular Iron. - Materials Science Research International, Special Technical Publication, Kyoto, Japan. T. Hoshide (ed.). ISBN: 4-901381-08-3. 2001. pp. 92-96.

Marquis, G., Thermal fatigue of NPP components: potential multiaxial, environmental and small cycle effects. Plant Life Management. Midterm status of a R&D project. Solin, Jussi (ed). VTT Manufacturing Technology. VTT Symposium 218. ISSN:  0357-9387. ISBN: 951-38-5727-1. 2001. pp. 67-90.

Marquis, G., Durability Management: Fatigue damage measurement methods. VTT Manufacturing Technology research report

Niemi E., STRUCTURAL STRESS APPROACH TO FATIGUE ANALYSIS OF WELDED COMPONENTS,- DESIGNER'S GUIDE - , Final Draft. IIW Doc. XIII-1819-00. Lappeenranta University of Technology, Departement of Mechanical Engineering, Lappeenranta 2001.

Halme, T., Generalised Beam Theory in Thin Plate Analysis. - 2nd European Conference on Computational Mechanics ECCM-2001, Krakova. ISBN: 83-85688-68-4. 2001. p. 1101.

Li X. Y., Partanen T., Nykänen T. and Björk T., Finite element analysis of the effect of weld geometry and load condition on fatigue strength of lap joint, International Journal of Pressure Vessels and Piping, v 78, n 9, Nov 23, 2001, p 591-597 ISSN: 0308-0161

Nykänen, T. & Partanen, T. & Björk, T., A parametric fracture mechanics analysis of fatigue of a filled welded corner joint. HRO Teemapäivät 2001 Lappeenrannassa, 13-14.6.2001, LTKK, Konetekniikan osasto. IIW-Doc.XIII-1875-01. 2001. pp. 37-76.

Nykänen, T. & Partanen, T. & Björk, T., A parametric fracture mechanics analysis of fatigue of a single filled welded T-joint. HRO Teemapäivät 2001 Lappeenrannassa, 13-14.6.2001, LTKK, Konetekniikan osasto. IIW-Doc.XIII-1874-01. 2001. pp. 77-90.

Li, X. & Partanen, T. & Nykänen, T. & Björk, T., Evaluation of fatigue strength of angle joint with fully penetration. - Lappeenrannan teknillinen korkeakoulu.  Konetekniikan osasto. 2001. 34 s.

Li, X. & Partanen, T. & Nykänen, T. & Björk, T., The effect of weld geometry and loading conditions on the fatique strength of welded cover plate details. HRO Teemapäivät 2001 Lappeenrannassa 13-1.-6.2001, LTKK. IIW-Doc XIII-1878-01. 2001. pp. 91-103.

Huhtala, L. & Talja, A. & Yrjölä, P. & Kyröläinen, A. & Partanen, T., The effect of welding on the strength of cold-formed stainless steel connections. - Finno-Ugric International Conference of Mechanics, 27.5.-2.6.2001, Ráckeve, Hungary.  . 12 p.

Huhtala, L. & Talja, A. & Yrjölä, P. & Kyröläinen, A. & Partanen, T., The effect of welding on the strength of cold-formed stainless steel connections. - NSCC 2001 Proceedings. Vol 9. Nordic Steel Construction Conference. ISBN: 952-9683-03-0. 2001. 8 p.

Kilkki, J. & Lampinen, J. & Martikka, H., Applying the differential evolution algorithm to the optimisation of cross sections of steel columns. - Computer Aided Optimum Design of Structures VII, Southampton, UK. ISSN:  1462-6055. ISBN: 1-85312-868-6. 2001. pp. 87-96.

Kilkki, J. & Wu, H. & Handroos, H., Applying the differential evolution algorithm to the optimisation of redundant parallel manipulator. - Eurogen 2001, Evolutionary Methods for Design, Optimization and Control with Applications to Industrial Problems, Athens, Greece. 2001. pp. 9-10.
Muut julkaisut:

Kilkki, J., AGIFAPin nykyaikaistaminen. Hitsattujen Rakenteiden Optimointi -foorumin Teemapäivät 2001, Lappeenrannan teknillinen korkeakoulu 13.-14.6.2001. - Lappeenrannan teknillinen korkeakoulu. Konetekniikan osasto. Raportti - Report 11. ISSN:  0787-5142. ISBN: 951-764-557-0. 2001. s. 143-149.

Kilkki, J. & Wu, H. & Handroos, H., Applying the differential evolution algorithm to the optimisation of new industrial product. Finno-Ugric International Conference of Mechanics with Beda Symposium, 27.5.-2.6.2001 Rackeve, Budapest, Hungary. Technical University of Budapest, Hungary 2001. 1 s.

Lagstedt, A. & Kilkki, J. & Kokkonen, J. & Handroos, H., The flexibility behaviour of a spatial parallel mechanism. - Lappeenrannan teknillinen korkeakoulu, konetekniikan osasto. Tutkimusraportti - Research report 28. ISSN:  0787-5169. ISBN: 951-764-290-3. 2001. 9 [37] p.

Ion, J. & Kokkonen, J., A comparison of gas tungsten arc and CO2 laser beam welding of AA2024. Journal of Laser Application 13(2001)2. - Laser Institute of America. ISSN:  1042-346X. Melville, NY, USA 2001. pp. 79-83.

Lepistö, J. & Varis, J., Establishing Clinching Parameters: A Simple Testing-based Procedure and Simulation of the Clinching Process Using Finite Element Analysis. - FUDoM 01 Finno-Ugric International Conference of Mechanics with Beda Symposium, 27.5.-2.6.2001,0 Rackeve, Hungary. 7 s.

Muut julkaisut:

Lepistö, J., Kennoprojektin väsytyskokeiden tuloksia. Hitsattujen rakenteiden optimointi-foorumin teemapäivät 2001. Lappeenrannan teknillinen korkeakoulu 13.-14.6.2001.Toim. Ilkka Poutiainen. - Lappeenrannan teknillinen korkeakoulu. Konetekniikan osasto. Raportti - Report 11. ISSN:  0787-5142. ISBN: 951-764-557-0. 2001. s. 157-160.

Tanskanen Pasi, The evolutionary structural optimization (ESO) method: Theoretical aspects and the modified evolutionary structural optimization (MESO) method, PhD Thesis, Lappeenranta University of Technology. Department of Mechanical Engineering. Research Papers 101. Lappeenranta 2000.

Lihavainen Veli-Matti, Partanen Teuvo. Experimental Determination of Fatigue Strength of Dynamically loaded Welded Joints. IIIW-DOC XIII-1843-00

1999
Konetekiikan osaston julkaisut 1999, Publications in Mechanican Department in year 1999.

Lagstedt, A. & Kilkki, J. & Kokkonen, J. & Handroos, H. The flexibility behaviour of a spatial parallel mechanism. - Lappeenranta University of Technology. Department of Mechanical Engineering. Research report 28. 1999. 9,[37] p.

Lihavainen, V. & Partanen, T. Hot spot fatique strenght of welded joints improved by remelting, grinding and hammer peening the weld toe. - The 3rd International Conference and Exhibition on Marine Intellectual Technologies, Morintech 99, Saint Petersburg, Russia, 14-17.9.1999. 5 p.

Kokkonen, J. & Ion, J. CO₂ Laser-welding of the aluminium aerospace alloy A2024. - NOLAMP'7. Proceedings of the 7th Nordic Conference on Laser-Material Processing. Eds. V.Kujanpää, J.Ion. Vol 2. Acta Universitatis Lappeenrantaensis 84. 1999. p. 418-429.

E Niemi and P Tanskanen. Hot spot stress determination for welded edge gussets. XIII-1781-99 (XV-1027-99)

Partanen Teuvo, On the Application of Beam on Elastic Foundation Theory to the Analysis of Stiffened Plate Strips, PhD Thesis, Lappeenranta University of Technology. Department of Mechanical Engineering. Research Papers 86. Lappeenranta 1999.

Partanen, T. & Niemelä, K. & Ion, J. & Martikainen, J. On the capbility and accuracy of NDT methods for detecting growing fatigue crocks. Join Meeting of IIW Commissions XIII and XV, IIW   Annual Assembly in Lisbon, July 1999.  IIW Document XIII-1788-99, XV-1028-99. 1999. 20 p.

Partanen, T. & Niemi, E. Hot spot S-N curves based on fatique tests of small MIG-welded aluminium specimens. IIS/IIW-1343-96(ex. Doc. XIII-1636-96/XV-921-XV). Welding in the World 43(1999)1. p. 16-23.

Poutiainen, I. & Partanen, T. Determination of hot spot stress concentration factor equations by finite element analysis. - The 3rd International Conference and Exhibition on Marine Intellectual Technologies, Morintech 99, Saint Petersburg, Russia. 1999. 5 p.

Niemi E., What Every Welding Enginer Should Know about Metal Fatigue. In: J. Martikainen & H. Eskelinen (Eds.), Proceedings of Welding Conference JOIN '99, International Conference on Efficient Welding in Industrial Applications. Acta Universitatis Lappenrantaensis 85, Lappeenranta 1999, pp. 1-10.

Niemi E. & Tanskanen P., Hot spot stress determination for welded edge gussets. IIW Doc. XIII-1781-99 (XV-1027-99).

Peeker Eerik, Niemi Erkki,  Fatigue Crack Propagation Model Based on a Local Strain Approach. Journal of Constructional Steel Research, 49 (1999) pp 139 - 155.

Peeker, E. & Niemi E. Fatigue Crack Propagation Model Based on a Local Strain Approach. Journal of Constructional Steel Research 49 (1999) 139-155.

Nykänen, T. Fatique crack growth simulations in laser-welded lap joints. IIS/IIW 1432-98 (ex. Doc XIII-1707-98). Welding in the World 43(1999)5. p. 42-46.

Nykänen, T. Geometric dependency of fatique strength in a transverse load-carrying cruciform joint with partiallypenetrating K-welds. IIS/IIW-1433-99 (ex. Doc XIII-1709-98). Welding in the World 43(1999)5. p. 47-53.

1998
Konetekiikan osaston julkaisut 1998, Publications in Mechanican Department in year 1998. 

Koivula Risto, Transformations of Displacement and Force Quantities Between Systems of Axes and Generic Points of Rigid Open Cross-Section. In: N.E.Shanmugam, J.Y.Richard Liew, V.Thevendran (toim.): Thin-Walled Structures. Research and Development, pp 535 - 542, Singapore 1998, ISBN 0-08-043003-1

Jantchoukovitch A., Partanen T. & Rinnevalli J., Application of the Hot Spot Stress Approach to Fatigue Analysis of Large Welded Structures. In: V.E. Spiro & B.P. Polonsky (Eds.), Proceedings of Second International Shipbuilding Conference - ISC'98, St. Petersburg 1998.

Partanen T. & Niemi E., Fatigue Analysis and Resistance of Welded Steel Components Based on Hot Spot Stress Approach. In: V.E. Spiro & B.P. Polonsky (Eds.), Proceedings of Second International Shipbuilding Conference - ISC'98 , St. Petersburg 1998.

Lahti K., Niemi E. & Hänninen H., Nominal Stress Range Fatigue of Stainless Steel Fillet Welds. In: Choo & Van der Vegte (Eds.), Tubular Structures VIII, Balkema, Rotterdam 1998.

Niemi, E., Comparison of Variable Amplitude Fatigue Life Estimations Using Hot Spot and Fracture Mechanics Approaches. IIW Doc. XIII-1710-98 .

Nykänen T., Geometric Depedency of Fatigue Strength in a Transverse Load-Carrying Cruciform Joint with Partially-Penetrated K-Welds. IIW-Document XIII-1709-98. Lappeenranta University of Technology, Department of Mechanical Engineering. Lappeenranta 1998. 14 p.

Nykänen T., Fatigue Crack Growth Simulations in Laser-Welded Lap Joints.  IIW-Document XIII-1707-98. Lappeenranta University of Technology, Department of Mechanical Engineering. Lappeenranta 1998. 11 p.

Partanen T., Fatigue Design of Misaligned Welded Joints In: G. Marquis, J. Solin (Eds.), Fatigue Design 1998, Vol II. Preprints of VTT a Symposium. Technical Research Centre of Finland, Espoo 1998. 

Halme, T. & Lepistö, J. & Partanen, T. Design life assessment of thin walled structural component using hot spot method and generalised beam theory. - Nordic Steel Construction Conference 98, Bergen, Norway, 14-16 Sep, 1998. Vol 1. ISBN: 82-91466-02-5. s. 261-269.

Kilkki, J. & Niemi, E. & Poutiainen, I. Nuolipeitelevyn hitsausliitoksen Ks-kerroinyhtälöt. - Väsymismitoitus ja teemapäivät 1997, Mikkeli 18-19.9.1997. Toim. Asko Kähönen, Eila Moring. VTT Symposium 178. Espoo 1998. s. 88-114.

Kilkki, J. & Niemi, E. & Poutiainen, I. Pyrstöpeitelevyn hitsausliitoksen Ks-kerroinyhtälöt. - Väsymismitoitus ja teemapäivät 1997, Mikkeli 18-19.9,1997. Toim. Asko Kähönen & Eila Moring. VTT Symposium 178. s. 71-87.

Kilkki, J. & Niemi, E. & Poutiainen, I. Yksipuoleisen poikittaisrivan jännitysanalyysi ja konsentraatiokertoimet. - Väsymismitoitus ja teemapäivät 1997, Mikkeli 18-19.9,1997. Toim. Asko Kähönen & Eila Moring. VTT Symposium 178. s. 127-136.

Kokkonen, J. Laserhitsatun alumiinin väsyminen. - Väsymismitoitus ja teemapäivät 1997, Mikkeli 18-19.9,1997. Toim. Asko Kähönen, Eila Moring. - Valtion teknillinen tutkimuskeskus. VTT Symposium 178. s. 54-64.

Halme, T. & Lepistö, J. & Partanen, T. Design life assessment of thin walled structural component using hot spot method and generalised beam theory. - Nordic Steel Construction Conference 98, Bergen, Norway, 14-16 Sep, 1998. Vol 1. ISBN: 82-91466-02-5. s. 261-269.

Lihavainen, V. Blokkikuormituskokeen tuloksia. - Väsymismitoitus ja Teemapäivät, Mikkeli, 18.-19.9.1997. Toimittajat: Asko Kähönen & Eila Moring. VTT Symposium 178. ISBN: 951-38-4570-2. Espoo 1998. 9 s.

Lihavainen, V. Hitsausparametrien vaikutus väsymiskestävyyteen. - Väsymismitoitus ja Teemapäivät 1997 : Mikkeli, 18.-19.9.1997. Toimittajat: Asko Kähönen & Eila Moring. VTT Symposium 178. ISBN: 951-38-4570-2. Espoo 1998. 8 s.

Lihavainen, V. IIW:n Round Robin -tutkimus jälkikäsittelymenetelmistä. - Väsymismitoitus ja Teemapäivät 1997 : Mikkeli, 18.-19.9.1997. Toimittajat: Asko Kähönen & Eila Moring. VTT Symposium 178. ISBN: 951-38-4570-2. Espoo 1998. 10 s.

Konetekniikan osaston julkaisut 1998

1997
Konetekiikan osaston julkaisut 1997, Publications in Mechanican Department in year 1997.

Zhang Z. & Niemi E., Analysis of Ductile Behaviour of Welded Joints by Damage Mechanics. CSC News, Vol. 9, No 4, p. 6-8. 

Niemi E., Random Load Behavior of Welded Components. In: S.J. Maddox & M. Prager (Eds.), International Conference on Performance of Dynamically Loaded Welded Structures. Proceedings of the Conference held in San Francisco, CA, July 14-15, 1997. Welding Research Council, Inc, New York 1977, pp. 339-353. 

Partanen T., Salminen A., Lihavainen V-M. & Niemi E., Experimental and Theoretical Studies on Fatigue Strength of Laser Butt Welded Joints. Welding in the World, Vol. 39, No. 2 1997, p. 74-88.

Niemi E. & Koskimäki M., Fatigue Strength of Welded Joints in Three Types of Stainless Steel. Welding in the World, Vol. 39, No. 2 1997, p. 65-73.

Zheng M. & Niemi E., Analysis of the Stress Concentration Factor for a Shallow Notch by the Slip-Line Field Method. Int. J. Fatigue Vol. 19, No. 3, pp. 191-194, 1997. 

Zheng M., Niemi E. & Zheng X., An Energetic Approach to Predict Fatigue Crack Initiation Life of LY12CXAluminium and 16 Mn Steel. Theoretical and Applied Fracture Mechanics 26 (1997) p. 23-28. 

Konetekniikan osaston luettelo kirjallisesta toiminnasta 1997

1996

Konetekiikan osaston julkaisut 1996, Publications in Mechanican Department in year 1996.

Partanen T., Collection of Hot Spot Stress Based Fatigue Strength Test Data of Arc-Welded Steel Joints. Väsymismitoitus (Fatigue Design) 1996 . VTT Symposium166. 16 p. 

Niemi E., Analysis of Variable Amplitude Fatigue of Welded Joints Using Equivalent Constant Amplitude Stress Range. Väsymismitoitus (Fatigue Design) 1996. VTT Symposium 166. 16 p 

Soininen R., Fracture Behaviour and Assessment of Design Requirements against Fracture in Welded Steel Structures Made of Cold-Formed Rectangular Hollow Sections. Ph.D. Thesis. Lappeenranta University of Technology. Research Papers 52. Lappeenranta 1996. 238 p. 

Lepistö J., Nikula S. & Niemi E., Optimum Design of Cold-Formed Sections, Using Generalized Beam Theory. In: J. Rondal, D. Dubina & V. Gioncu (Eds.), Proc. Conf. Coupled Instabilities in Metal Structures, Liege 5-7 Sept. 1996. Imperial College Press, London 1996. 

Niemi E., Fatigue Resistance Predictions for RHS K-Joints, Using Two Alternative methods. In: J. Farkas & K. Jarmai (Eds.), Proceedings of VII International Symposium on Tubular Structures, Miskolc 28-30 August, 1996. A.A. Balkema, Rotterdam 1996. 

Partanen T. & Niemi E., Hot spot stress approach to fatigue strength analysis of welded components : Fatigue test data for steel plate thicknesses up to 10 mm. Fatigue Fract. Engng Mater. Struct. Vol 19, No. 6, pp. 709-722, 1996. 

Zheng M. & Niemi E., Temperature dependence of the material characterizing ductility factor in the new damage theory. Int J Fract 76: R77-R81,1996. 

Niemi E., Use of cold-formed rectangular hollow sections in welded structures subject to low ambient temperatures. Lappeenranta University of Technology, Department of Mechanical Engineering. CIDECT Project 5AQ/2: Cold-Formed RHS in Arctic Steel Structures, Final report 5AQ-5-96. Lappeenranta 1996. 6 p. 

Partanen T. & Niemi E., Hot spot S-N curves based on fatigue tests of small MIG welded aluminium specimens. IIW-Document XIII-1636-96. Lappeenranta University of Technology, Department of Mechanical Engineering. Lappeenranta 1996. 15 p. 

Nykänen T., Fatigue Crack Growth Simulations in Transverse Butt Welds Made on Permanent Backing Bars. IIW-Document XIII-1624-96. Lappeenranta University of Technology, Department of Mechanical Engineering. Lappeenranta 1996. 14 p. 

Niemi E., Thickness Effect in Welded T-Joints Subjected to Constant and Variable Amplitude Loading. IIW-Document XIII-1623-96. Lappeenranta University of Technology, Department of Mechanical Engineering. Lappeenranta 1996. 10 p. 

Niemi E., Analysis of Variable Amplitude Fatigue Using Equivalent Constant Amplitude Stress Range. IIW-Document XIII-1622-96. Lappeenranta University of Technology, Department of Mechanical Engineering. Lappeenranta 1996. 11 p. 

Niemi E., Stress Determination for Fatigue Analysis of Welded Components. In: Nordisk seminarium: Utveckling inom området svetsade konstruktioner. Stockholm, March 26 1996. 3 p. 

Nykänen T.J., Fatigue crack growth simulations based on free front shape development. Fatigue Fract. Engng Mater. Struct. Vol. 19, No. 1, pp. 99-109,1996. 

Partanen T. & Björk T., Statistical analysis on convergence of yield line theory and experimental test capacity of RHS K- and T-joints. Finnish R & D Days for Steel Structures, Tampere 11-12.1.1996. 

Nykänen T., On fatigue crack growth simulation in a transverse lap joint. Finnish R & D Days for Steel Structures, Tampere 11-12.1.1996. 

Konetekniikan osaston luettelo kirjallisesta toiminnasta 1996

1995

Niemi E. & Yrjölä P., A Novel Fatigue Analysis Approach for Tubular Welded Joints. In: G. Marquis, J.Solin (Eds.), Fatigue Design 1995, Vol II. Preprints of VTT Symposium 156. Technical Research Centre of Finland, Espoo 1995, p. 189-201. 

Niemi E. & Zhang Z., Ductile Crack Initiation in Welded Joints between Cold-Formed Rectangular Hollow Sections. Russian-German Conference on Plastic and Heat Treatment of Advanced Metallic Materials. St. Petersburg 17-18.5.1995.

IIS/IIW-1221-93 (ex doc XIII-1458-92, XV-797-92). Stress Determination for Fatigue Analysis of Welded Components. Edited by Erkki Niemi. Abington Publishing, Cambridge 1995. 69 p.

Partanen T. & Niemi E., Collection of Hot Spot S-N Curves Based on Small Specimen Testing. IIW Doc. XIII-1602-95.

Koskimäki M. & Niemi E., Fatigue Strength of Welded Joints in Four Types of Stainless Steel. IIW Doc. XIII-1603-95.

Nykänen T., On Fatigue Crack Growth Simulation in a Transverse Double Lap Joint. IIW Doc. XIII-1583-95.

Zhang Z. L. and Niemi E., A new failure criterion for the Gurson- Tvergaard dilational constitutive model. International Journal of Fracture 70: 321-334, 1995.

Koskimäki Matti, Ruostumattomien terästen hitsausliitosten väsymisominaisuudet. Lisensiaatintyö. Lappeenrannan teknillinen korkeakoulu, konetekniikan osasto, konstruktiotekniikan laitos. Lappeenranta 1995. 

Konetekniikan osaston luettelo kirjallisesta toiminnasta 1995

Zhang Z. & Niemi E., Assessment of Ductile Crack Development in Welded (Tubular) Joints. 6 th Int Symp Tubular Struct, Melbourne 14-16 Dec., 1994. 7 p.

Niemi E., On the Determination of Hot Spot Stresses in the Vicinity of Edge Gussets. IIW Doc. XIII-1555-94. Lappeenranta University of Technology, Department of Mechanical Engineering. Lappeenranta 1994. 18 p.

Partanen T., Torvi T. & Niemi E., On Size Effects in Fatigue of Welded Joints. IIW Doc. XIII-1535-94 (XV-858-94). Lappeenranta University of Technology, Department of Mechanical Engineering. Lappeenranta 1994. 19 p.

Partanen T., Salminen A., Lihavainen V-M. & Niemi E., Experimental and Theoretical Studies on Fatigue Strength of Laser Welded Butt Joints. IIW Doc. XIII-1534-94 (XV-861-94). Lappeenranta University of Technology, Department of Mechanical Engineering. Lappeenranta 1994. 31 p.

Zhang Z. L., Explicit consistent tangent moduli with a return mapping algorithm for pressure-dependent elastoplasticity models, Comput. Meths. Appl. Mech. Engrg. 121 (1995) 29-44.

Zhang Z. L., On the accuracies of numerical integration algorithms for Gurson pressure-dependent elastoplastic constitutive models, Computer Methods in Appl. Mech. Engrg. 121 (1995) 15-28.

Zhang Z. L. and Niemi E., A class of generalized mid-point algorithms for Gurson-Tvergaard continuum damage material model. International Journal for Numerical Methods in Engineering, Vol. 38, 2033-2053 (1995).

Zhang Z.L. & Niemi E., Studies on the Ductility Predictions by Different Local Failure Criteria. Engineering Fracture Mechanics Vol. 48, (1994) No. 4, pp. 529-540.

Zhang Z.L. & Niemi E., Analyzing Ductile Fracture Using Dual Dilational Constitutive Equations. Fatigue Fract. Engng Mater. Struct. Vol. 17 (1994), No. 6, pp. 695-707.

Yrjölä P. & Niemi E., The Strength of Cold-Formed Rectangular Hollow Sections Made of Austenitic Stainless Steel. Stainless Steel Europe, Vol. 6, Issue 2, March 1994.

Zhang Z., A Practical Micro-Mechanical Model-Based Local Approach Methodology for the Analysis of Ductile Fracture of Welded T-Joints. PhD Thesis. Lappeenranta University of Technology. Department of Mechanical Engineering. Lappeenranta 1994. 151 p.

Konetekniikan osaston luettelo kirjallisesta toiminnasta 1994

1993

Yrjölä P. & Niemi E., Design Guidelines for Stainless Rectangular Hollow Sections. In depth research on promising application. Stainless Steel Europe 5/1993/1 January/February 1993. p. 27-31.

Nykänen T., Mk-factor Equations and Crack Growth Simulations for Fatigue of Fillet Welded T-joints. PhD Thesis, Lappeenranta University of Technology. Department of Mechanical Engineering. Research Papers 31. Lappeenranta 1993. 

Partanen T., Lindberg I. & Niemi E., On the Fatigue Behaviour of Transverse Fillet Welds in Lap Joints. IIW Doc. XIII-1505-93.

Niemi E. & Zhang, Z.L., Studies of the behaviour of RHS gap K-joints by non- linear FEM, Tubular structures, In: Coutie, M. & Davies, G. (Eds.): Tubular structures, Proc. of the 5th Int. Symp., Nottingham, 1993.

Partanen, T. & Björk, T., On Convergence of Yield Line Theory and Experimental Test Capacity of RHS K- and T-Joints, In: Coutie, M. & Davies, G. (Eds.): Tubular structures, Proc. of the 5th Int. Symp., Nottingham, 1993.

Niemi, E. Behaviour of rectangular hollow section trusses with stocky members, In: Coutie, M. & Davies, G. (Eds.): Tubular structures, Proc. of the 5th Int. Symp., Nottingham, 1993.

Niemi, E., Aspects of good design practice for fatigue-loaded welded components. In: Solin J., Marquis G., Siljander A. & Sipilä S. (Eds.): ESIS Publication no 16, Mechanical Engineering Publications, London, 1993.

Konetekniikan osaston luettelo kirjallisesta toiminnasta 1993

Koskimäki M. & Niemi E., Fatigue Strength of Polarit 721, 803 and 854 Welded Joints. Stainless Steel '91, Kista, Stockholm, 1992.

Zhang, Z.L. and Mikkola, T.P.J., A Simple Path-Independent Integral for Calculating mixed-mode Stress Intensity Factors, Fatigue Fract. Engng Mater. Struct., Vol. 15, No. 10, 1992.

Partanen, T., Factors affecting the Fatique Behaviour of Misaligned Transverse Butt Joints in Stiffened Plate Structures, In: M. Bramat (Ed.) Engineering design in welded constructions, Proc. IIW Conf. Madrid, 1992.

Partanen, T., Tarjavuori, P., and Niemi, E., Definition of the Hot Spot Stress Gradient in Stiffened Plate Structures Based on the Beam on Elastic Foundation Theory, IIW Doc. XII-1478-92,XV-811-92, July 1992.

Niemi, E., Determination of Stresses for Fatigue Analysis of Welded Components, In: M. Bramat (Ed.) Engineering design in welded constructions, Proc. IIW Conf. Madrid, 1992, 57 -64.

Dahlberg, L., Niemi, E., et al., A Procedure for Assessment of the Integrity of Structures Containing discontinuities, In: M. Bramat (Ed.) Engineering Design in Welded Constructions, Proc. IIW Conf. Madrid, 1992, 223 - 229.

1991

Niemi E., Fatigue Tests on Small Rectangular Hollow Section Joints. Lappeenranta University of Technology, Department of Mechanical Engineering, Report No. 3. Lappeenranta 1991.

Niemi E., Fracture Tests on Small Rectangular Hollow Section Joints. Lappeenranta University of Technology, Department of Mechanical Engineering, Report No. 2. Lappeenranta 1991.

Partanen T., On Convergence of the Yield Line Theory and Nonlinear FEM Results in Plate Structures. In: J:Wardenier, E.Panjeh Shahi (Eds.), Tubular Structures, 4th International Symposium, Delft 1991. p. 313-323.

Björk T., On the Spring Constant in Open Section Joints. In: E. Niemi (ed.), Proceedings of the 4th Finnish Mechanics Days, Lappeenranta 1991. p. 351-360.

Partanen T., On Factors Affecting the Fatigue Life of Welded Components Using the Hot-Spot Aproach. In: E. Niemi (ed.), Proceedings of the 4th Finnish Mechanics Days, Lappeenranta 1991. p. 343-349.

Nikula S., Elastic Buckling of Thin Walled Structures Using Spline Finite Strip Method. In: E. Niemi (ed.), Proceedings of the 4th Finnish Mechanics Days, Lappeenranta 1991. p. 285-294.

Proceedings of the 4th Finnish Mechanics Days. Ed. by E. Niemi. Lappeenranta University of Technology. Research Papers 17. Lappeenranta 1991. 388 p.

Assessment of the Integrity of Structures Containing Discontinuities. INSTA Technical Report. Stockholm 1991. p. 0.1, 1.1, 5.1-5.2, 8.1-8.3, D.1-D.31.

1990

Koskimäki M. & Niemi E., Finite Element Studies on the Behaviour of Rectangular Hollow Section K-joints. In: E. Niemi & P. Mäkeläinen (eds.), Tubular Structures. Proceedings of the Third International Symposium held in Lappeenranta 1-2 September 1989. Ed. by E. Niemi & P. Mäkeläinen. Elsevier Applied Science, 1990. p. 28-37.

Niemi E., Behaviour of Rectangular Hollow Section K-joints at Low Temperatures. In: E. Niemi & P. Mäkeläinen (eds.), Tubular Structures. Proceedings of the Third International Symposium held in Lappeenranta 1-2 September 1989. Ed. by E. Niemi & P. Mäkeläinen. Elsevier Applied Science, 1990. p. 19-27.

Tubular Structures. Proceedings of the Third International Symposium held in Lappeenranta 1-2 September 1989. Ed. by E. Niemi & P. Mäkeläinen. Elsevier Applied Science, 1990. 464 p.