1. Department of Mechanical engineering, ENSET, University of Douala, Douala, Cameroon
2. Mechanic Laboratory (LM), Doctoral Training Unit in Engineering Sciences (UFD-SI), University of Douala, Douala, Cameroon
3. Groupe de Recherche des Matériaux Innovants (GRMI), Université de Douala, Douala, Cameroon
4. Laboratory of Mechanic and Adapted Materials Laboratory (LAMMA), ENSET-University of Douala, Douala, Cameroon