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[FAQ]

Mechanical does not allow zero length springs so a command object is the only way to create them. Below is the command object that will create 6 spring elements. Insert the command object Analysis environment level. It requires a named selection for the vertex where it will attach 6 springs. !!!!!!!! envronment command object to create 6 zero length springs at named selelction spr containing one vertex fini /prep7 *get,ndmax,node,,num,maxd *get,elmax,elem,,num,maxd *get,etmax,etyp,,num,max cmsel,s,spr ! spr is a named selection containing one vertex created in Mechanical ndspr=ndnext(0) n,ndmax+1,nx(ndspr),ny(ndspr),nz(ndspr) ! *dim,stf,array,6 stf(1)=1,2,3,4,5,6 ! replace 1 to 6 with your stiffness values ! *do,kk,1,6 et,etmax+kk,14, ,kk type,etmax+kk mat,etmax+kk r,etmax+kk,stf(kk) real,etmax+kk secn,etmax+kk en,elmax+kk,ndmax+1,ndspr *enddo allsel cmsel,all fini /solu