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Publicações
Machado, P., Cláudio, R.A., Valido, A.J., Duarte, R. e Martins, O. (2010), “Pre-Validation of Welded Joints in a Bike Frame”, Proceedings of Iberian Conference on Fracture and Structural Integrity 2010, 17-19 March, Porto, Portugal, pp. 133-138
In many industrial situations, it is necessary to prove that a certain product meets quality requirements even if it is not yet produced. For the present case, is it necessary to verify that an automated weld procedure for bike frames, different from the conventional, meets the structural strength requirements imposed by an international standard. However, due to the extent of automation required, it is impossible to produce at least one bike frame in order to test it. For preliminary validation proposes and to optimize welding parameters, it was proposed to perform tests on specimens.This work presents a procedure to verify if the welded joints meet the requirements of EN14766 standard in terms of fatigue strength, by testing specimens. The bike frame geometry was analysed using the finite element method with the loads and constrains defined by EN14766 standard. From this model it was possible to indentify which joins were critically loaded and their respective acting loads. A special griping device was designed for a single axis servo-hydraulic testing machine in order toapply normal loads and bending momentssimilar to the ones calculated. Several H shaped welded specimens were fatigue tested and the results shown that this automated welding procedure is able to meet EN14766 standard requirements in terms of fatigue resistance.
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