The special issue of Comptes Rendus Mécanique with contributions form the last SEMNI-CSMA workshop held in Jaca, Spain, in 2017, is now available at ow.ly/kykH30kpUIR. This workshop was held on the occasion of the retirement of prof. Pierre Villon (UT Compiegne). The issue has been proudly edited by P. Breitkopf, F. Chinesta and E. Cueto.