Method of assembling at least two units, and a corresponding assembled structure

A method comprising:

• providing a first unit having a field of grip elements and a second unit provided with retention elements suitable for co-operating with the grip elements of the first unit in order to provide a self-gripping fastening;
• putting the first and second units into contact in such a manner that the grip elements of the first unit and the retention elements of the second unit provide the self-gripping fastening;
• treating a treatment zone of the self-gripping fastening through a treatment in order to deform the grip elements of the first unit and/or the retention elements of the second unit, whereby the first and second units are permanently secured to each other, thereby forming an assembled structure;
• providing a third unit comprising a field of grip elements suitable for co-operating with the retention elements of the second unit in order to provide a self-gripping fastening;
• putting the second and third units into contact so that the second unit is arranged between the first and third units, and the grip elements of the third unit and the retention elements of the second unit provide a second self-gripping fastening;
• and
• treating a treatment zone of the second self-gripping fastening to deform the grip elements of the third unit and/or the retention elements of the second unit, whereby the second and third units are permanently secured to each other.