LAP SHEAR TEST OF A MAGNESIUM FRICTION SPOT JOINT: NUMERIC MODELING
ENSAIO DE CISALHAMENTO EM UMA JUNTA POR FRICÇÃO POR PONTO DE MAGNÉSIO: MODELAGEM NUMÉRICA
Campanelli, Leonardo Contri; Antonialli, Armando Ítalo S.; Alcântara, Nelson Guedes de; Bolfarini, Claudemiro; Suhuddin, Uceu Faud H.; Santos, Jorge Fernandez dos
http://dx.doi.org/10.4322/tmm.2013.014
Tecnol. Metal. Mater. Min., vol.10, n2, p.97-102, 2013
Abstract
Friction spot welding (FSpW) is one of the most recently developed solid state joining technologies. In this work, based on former publications, a computer aided draft and engineering resource is used to model a FSpW joint on AZ31 magnesium alloy sheets and subsequently submit the assembly to a typical shear test loading, using a linear elastic model, in order to conceive mechanical tests results. Finite element analysis shows that the plastic flow is concentrated on the welded zone periphery where yield strength is reached. It is supposed that "through the weld" and "circumferential pull-out" variants should be the main failure behaviors, although mechanical testing may provide other types of fracture due to metallurgical features.
Keywords
Friction welding, Magnesium, Finite element, Shear test
Resumo
A soldagem por fricção por ponto (FSpW) é uma das tecnologias desenvolvidas mais recentemente no que se refere à união no estado sólido. Neste trabalho, com base em publicações anteriores, é utilizado um recurso computacional de desenho e projeto para modelar uma junta por FSpW em chapas de liga de magnésio AZ31 e, posteriormente, submeter o conjunto a uma carga de cisalhamento típica, usando um modelo elástico linear, a fim de compreender os resultados dos ensaios mecânicos. A análise por elementos finitos mostra que o escoamento plástico concentra-se na periferia da zona soldada onde a tensão limite de escoamento é atingida. Presume-se que as variantes “através da solda” e “arrancamento circunferencial” sejam os principais modos de falha, ainda que os ensaios mecânicos venham a apresentar outros tipos de fratura em razão de fatores metalúrgicos.
Palavras-chave
Soldagem por fricção, Magnésio, Elementos finitos, Ensaio de cisalhamento
Referências
1 Mishra RS, Ma ZY. Friction stir welding and processing. Mater Sci Eng Reports. 2005;50:1-78. http://dx.doi. org/10.1016/j.mser.2005.07.001
2 Schilling C, Santos J, inventores; GKSS – Forschungszentrum Geesthacht, produtor. Method and device for linking at least two adjoining work pieces by friction welding. United States patent US 6,722,556 B2. 20 abr. 2004.
3 Barnes TA, Pashby IR. Joining techniques for aluminium spaceframes used in automobiles. Part II: adhesive bonding and mechanical fasteners. J Mater Process Tech. 2000;99:72-9. http://dx.doi.org/10.1016/S0924-0136(99)00361-1
4 Briskham P, Blundell N, Han L, Hewitt R, Young K. Comparison of self-pierce riveting, resistance spot welding and spot friction joining for aluminium automotive sheet. Warrendale: SAE International: 2006. (SAE technical paper, 2006-01-0774).
5 Yang YS, Lee SH. A study on the joining strength of laser spot welding for automotive applications. J Mater Process Tech. 1999;94:151-6. http://dx.doi.org/10.1016/S0924-0136(99)00094-1
6 Muci-Küchler KH, Kalagara S, Arbegast WJ. Simulation of a refill friction stir spot welding process using a fully coupled thermo-mechanical FEM model. J Manuf Sci Eng. 2010;132:014503. http://dx.doi.org/10.1115/1.4000881
7 Li B, Kang HT. Temperature distribution during friction stir spot welding of magnesium alloy AM60B. J Test Eval. 2011;39:16-24. http://dx.doi.org/10.1520/JTE101910
8 Hirasawa S, Badarinarayan H, Okamoto K, Tomimura T, Kawanami T. Analysis of effect of tool geometry on plastic flow during friction stir spot welding using particle method. J Mater Process Tech. 2010;210:1455-63. http://dx.doi. org/10.1016/j.jmatprotec.2010.04.003
9 Kim D, Badarinarayan H, Ryu I, Kim JH, Kim C, Okamoto K et al. Numerical simulation of friction stir spot welding process for aluminum alloys. Met Mater Int. 2010;16:323-32. http://dx.doi.org/10.1007/s12540-010-0425-9
10 Mazzaferro JAE, Rosendo TS, Mazzaferro CCP, Ramos FD, Tier MAD, Strohaecker TR et al. Preliminary study on the mechanical behavior of friction spot welds. Soldagem Insp. 2009;14:238-47. http://dx.doi.org/10.4028/www. scientific.net/MSF.706-709.3016
11 Campanelli LC, Suhuddin UFH, Santos JF, Alcantara NG. Preliminary investigation on friction spot welding of AZ31 magnesium alloy. Mat Sci Forum. 2012;706-709:3016-3021. http://dx.doi.org/10.4028/www.scientific.net/MSF.706- 709.3016 http://dx.doi.org/10.1016/j.jmatprotec.2012.11.002
12 Campanelli LC, Suhuddin UFH, Antonialli AIS, Santos JF, Alcântara NG, Bolfarini C. Metallurgy and mechanical performance of AZ31 magnesium alloy friction spot welds. J Mater Process Tech. 2013;213:515-521. http://dx.doi. org/10.1016/j.jmatprotec.2012.11.002
13 International Organization of Standardization. ISO 14273:2000: Specimen dimensions and procedure for shear testing resistance spot, seam and embossed projection welds. Geneva; 2000.
14 Bathe K-J. Finite element procedures. New Jersey: Prentice Hall; 1996.
15 Housh S, Mikucki B. Properties of magnesium alloys. In: American for Metals. Properties and selection: nonferrous alloys and special-purpose materials. Materials Park: ASM International; 1990. v. 2, p. 480-516.
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