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In this work laser‐welded tube‐tube specimens made of aluminium alloys AlMg3.5Mn and AlSi1MgMn T6 were experimentally tested under constant and variable amplitude loading, under pure axial and pure torsion loading. In order to evaluate the influence on fatigue behaviour of the residual stresses, because of the welding process, some specimens were subjected to postweld heat treatment and then were tested. The numerical analyses, using finite element (FE), were carried out to obtain a reliable estimation of the residual stress in the specimen. The numerical results were in a good agreement with experimental ones obtained by means of hole‐drilling method. Finally, the residual stress distribution was superimposed to stress distribution because of fatigue loads obtained by FE analyses applying local concept, to calculate the stresses in the crack initiation zone and to understand the different types of failure that occurred in as‐welded and relieved specimens. [ABSTRACT FROM AUTHOR]

In the present work, a preliminary design of an eco‐sustainable bamboo electric treadmill bike is carried out. It is a new means of transport with zero environmental impact that also allows to overcome the main disadvantage of the indoor training. Bamboo, as an eco‐friendly material, has great potential as construction material for bike frames because it represents an alternative for more traditional materials such as steel, aluminum, and composite. A finite element model of the designed prototype is developed and then validated using Abaqus commercial code following the UNI EN 14764 static standard. Numerical analyses show good structural behavior of the designed frame in compliance with the regulations. [ABSTRACT FROM AUTHOR]