1 Grupo de Investigación de Estudios en Diseño - GED, Facultad de Diseño Industrial, Universidad Pontificia Bolivariana, Sede Medellín, Circular 1 Nº 70-01, Medellín, Colombia

2 HA Bicicletas, Colombia


The high requirements of Bicycle Motocross (BMX) race conditions demands on the bicycle frame complex dynamic and static loads states by which it is expected that frames to experience high levels of stress and strain. To build efficient bike frames in terms of performance, weight and quality, it is necessary to analyse systematically its response against different loads. The aim of this work is to perform the design of a BMX frame for the national team of Colombia, including the microstructural and mechanical characterization of the initial bicycle frame as complement for the macrostructural characterization of the frame in static conditions. The components of the bike frame were exanimated using optical emission spectrometry, metallographic examinations, microhardness measurements and mechanical tests. It was found that significant differences of the grain sizes of the samples were reflected in the deformation values measured in the frame showing a high structural anisotropy. Despite this, the microhardness and mechanical resistance values the results show coherence between them. In Addition, safety coefficient of the four of the components of the bicycle frame was calculated finding that coefficient values was the calculated safe factor was 4.27. Copyright © 2018 VBRI Press


1.J.B. Watt, R.F. Reiser 2nd, M.L. Peterson, D.E. Walrath,
Quantifying power output during cycling through measuring strain
energy in a bicycle frame, Biomed. Sci. Instrum. 38 (2001)

2.A. V Manolova, S. Crequy, P. Lestriez, P. Debraux, W.M.
Bertucci, Relationship between the Pedaling Biomechanics and
Strain of Bicycle Frame during Submaximal Tests, Sports. 3
(2015) 87102.

3.F. Dwyer, Material and Design Optimization for an Aluminum
Bike Frame, (2012).

4.N. Wang, Z. Zhou, G. Lu, Microstructural evolution of 6061 Alloy
during isothermal heat treatment, J. Mater. Sci. Technol. 27 (2011)

5.ASTM International, ASTM B308 for particular alloy in standard
shapes and extrusions, West Conshohocken, Pensilvania.

6.A. Dorbane, G. Ayoub, B. Mansoor, R. Hamade, G. Kridli, A.
Imad, Observations of the mechanical response and evolution of
damage of AA 6061-T6 under different strain rates and
temperatures, Mater. Sci. Eng. A. 624 (2015) 239249.

DOI: 10.1016/j.msea.2014.11.074.

7.W. Boonchouytan, J. Chatthong, S. Rawangwong, R. Burapa,
Effect of Heat Treatment T6 on the Friction Stir Welded SSM
6061 Aluminum Alloys, Energy Procedia. 56 (2014) 172180.

8.R.R. Ambriz, G. Barrera,R. García, V.H. López, The
microstructure and mechanical strength of Al-6061-T6 GMA
welds obtained with the modified indirect electric arc joint, Mater.
Des. 31 (2010) 29782986.

DOI: 10.1016/j.matdes.2009.12.017.

9.J.A. Vargas, J.E. Torres, J.A. Pacheco, R.J. Hernandez, Analysis of
heat input effect on the mechanical properties of Al-6061-T6 alloy
weld joints, Mater. Des. 52 (2013) 556564.


10.F. Khodabakhshi, M. Haghshenas, H. Eskandari, B. Koohbor,
Hardness−strength relationships in fine and ultra-fine grained
metals processed through constrained groove pressing, Mater. Sci.
Eng. A. 636 (2015) 331339.


11.C.F. Tan, M.R. Said, Effect of hardness test on precipitation
hardening aluminium alloy 6061-T6, Chiang Mai J. Sci. 36 (2009)

12.S. Kalpakjian, S.R. Schmid, C.-W. Kok, Manufacturing processes
for engineering materials, Pearson-Prentice Hall, 2008.