{"id":382849,"date":"2024-09-17T08:42:29","date_gmt":"2024-09-17T08:42:29","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/link-180-only-tensile-behaviour\/"},"modified":"2024-09-17T08:42:29","modified_gmt":"2024-09-17T08:42:29","slug":"link-180-only-tensile-behaviour","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/link-180-only-tensile-behaviour\/","title":{"rendered":"LINK 180 only tensile behaviour"},"content":{"rendered":"

<p>Hi everybody, i’m struggling with the use of link 180 in ansys mapdl.<\/p><p>I’m trying to reproduce a sailboat rig, and i need to model some stanless cables, used to sustain the mast. I thought that link 180 only tensile would be the perfect. In some load case the cable on one side of the boat are sagging, meaning they cannot hold any compression. I’m not interest in the deformed shape of the sagging cable of course.<\/p><p>  I triend some simply model to check the behaviour of the link 180 element used as a cable to sustain a beam, but it seems that even using seccontrol,,1 (only tensile) the result show a compression in the link elements. Why is the element not working with only tensile behaviour? any idea on how can i model the problem?<\/p><p>any help would be really appreciate. Thank you <\/p><p> <\/p><p>Here is  simpre problem whit a beam and 3 links that i used to check the behaviour:<\/p><p> <\/p><div>FINISH<\/div><div>\/CLEAR<\/div><div> <\/div><div>\/PREP7 !entra nel preprocessore<\/div><div> <\/div><div>!element type<\/div><div>ET,1,BEAM188 !definisce elemento trave<\/div><div>ET,2,LINK180 !definisce elemento asta<\/div><div> <\/div><div>!material property<\/div><div>MP, EX, 1, 69000000000  ! Modulo di elasticita MPa per il materiale 1 lega 6005a<\/div><div>MP, PRXY, 1, 0.3     ! Coefficiente di Poisson per il materiale 1<\/div><div>MP, DENS, 1, 2700 ! Densità lega 6005a<\/div><div> <\/div><div>!sections<\/div><div>SECTYPE, 1, BEAM, CTUBE !definisce sezione albero circolare di prova<\/div><div>SECOFFSET, CENT<\/div><div>SECDATA, 0.048, 0.05<\/div><div> <\/div><div>SECTYPE,2,LINK,2<\/div><div>SECDATA,0.0001,<\/div><div>SECCONTROL,1,1<\/div><div> <\/div><div>!geometry<\/div><div>K,1,0,0,0<\/div><div>K,2,10,0,0<\/div><div>K,3,0,3,0<\/div><div>K,4,0,-3,0<\/div><div>K,5,0,0,3<\/div><div> <\/div><div>L,1,2<\/div><div>L,2,3<\/div><div>L,2,4<\/div><div>L,2,5<\/div><div> <\/div><div>!mesh<\/div><div>LSEL,S,LENGHT,,9.99,10.01 !SELEZIONA  TUTTE LE LINEE DI LUNGHEZZA COMPRESA TRA 9.99 E 10.01<\/div><div>LATT,1,,1,,,,1                                  <\/div><div>LESIZE,ALL,0.5<\/div><div>LMESH,ALL<\/div><div>ALLSEL<\/div><div> <\/div><div> <\/div><div>LSEL,S,LENGHT,,10.43,10.45 !SELEZIONA  TUTTE LE LINEE DI LUNGHEZZA COMPRESA TRA 9.99 E 10.01<\/div><div>LATT,1,,2,,,,2                                  <\/div><div>LESIZE,ALL,,,1<\/div><div>LMESH,ALL<\/div><div>ALLSEL<\/div><div> <\/div><div>!carichi<\/div><div>!vincoli incastro <\/div><div>DK,1,,,,0,ALL<\/div><div>DK,3,,,,0,ALL<\/div><div>DK,4,,,,0,ALL<\/div><div>DK,5,,,,0,ALL<\/div><div>!forza applicata su k2<\/div><div>FK,2,FY,-1000000<\/div><div> <\/div><div>\/ESHAPE,1,0        !mostra sezione elementi<\/div><div>\/REPLOT<\/div><div> <\/div><div>\/SOL<\/div><div>\/STATUS,SOLU<\/div><div>SOLVE<\/div><div> <\/div><div>\/POST1<\/div><div>\/DSCALE,ALL,1 ! Use true scale (scale displacements by 1.0)<\/div><div>SET,LAST! read the last data set<\/div><div>PLNSOL,S,EQV,0,1.0 ! Plot equivalent (von Mises) stess<\/div><div>\/ESHAPE,1,0        !mostra sezione elementi<\/div><div>\/REPLOT<\/div><\/p>\n","protected":false},"template":"","class_list":["post-382849","topic","type-topic","status-publish","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t