{"id":356128,"date":"2024-03-08T16:42:15","date_gmt":"2024-03-08T16:42:15","guid":{"rendered":"\/forum\/forums\/topic\/residual-stress-and-ltb-check\/"},"modified":"2024-03-09T10:57:43","modified_gmt":"2024-03-09T10:57:43","slug":"residual-stress-and-ltb-check","status":"closed","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/residual-stress-and-ltb-check\/","title":{"rendered":"Residual stress and LTB check"},"content":{"rendered":"<p><a class=\"wp-colorbox-image cboxElement\" href=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/08-03-2024-1709915954-residual_stress.jpeg\"><img decoding=\"async\" src=\"\/forum\/wp-content\/uploads\/sites\/2\/2024\/03\/08-03-2024-1709915954-residual_stress.jpeg\" alt=\"\"><\/a><br \/>I have an issue with INISTATE command in&nbsp;<a class=\"ps-tag__link ps-csr\" href=\"https:\/\/community.ansys.com\/profile\/?12fd6bd56d3fdb528b420925793007a96cd49e26\/\" data-hover-card=\"38380\">Ansys Mechanical<\/a> apdl, where i apply linear varying stress i tried checking through Inistate list command , but the stress dont seem to vary linearly , not sure how to go about, the task is LTB check in angled section non linear.<br \/>i am not sure about the entire code as well am i progressing in right direction , plus the code works in only this specific order other wise ansys crashes , I need any tips on how to progress , BMD for Solid&nbsp; to get critical moment MCR. IF posssible please let me know how to improve the code as well.<\/p>\n<p>!!=======Material parameters (steel)==========<br \/>\/CLEAR,START<br \/>\/FILNAME,L_section,1<br \/>\/UNITS,SI<br \/>\/COM, Structural<br \/>E_STEEL=2.1e11 !n\/m^2<br \/>NU_STEEL=0.3<br \/>DENS_STEEL=7850<br \/>f_y =235000000 !n\/m^2<\/p>\n<p>!!========Modelling=========<\/p>\n<p>!*clear<br \/>\/prep7<\/p>\n<p>!!======Element Type=======<\/p>\n<p>ET,1,SOLID186<br \/>!DOF,UX,UY,UZ,ROTX,ROTY,ROTZ<\/p>\n<p>!!=======Material Properties=======<\/p>\n<p>mp,ex,1,E_STEEL<br \/>mp,prxy,1,NU_STEEL<br \/>mp,dens,1,DENS_STEEL<\/p>\n<p>!!========Geometric properties=======<\/p>\n<p>Total_Length=1 !!!LENGTH 1M<br \/>Length_leg= 0.25 !!!EQUAL ANGLED<br \/>Thickness_leg=0.02 !!!THICKNESS OF LSECTION<br \/>Radius_1=0.018<br \/>Radius_2=0.009<\/p>\n<p>!!========Define keypoints========<\/p>\n<p>k,1,0,0,0<br \/>k,2,Thickness_leg,0,0<br \/>k,3,Length_leg,0,0<br \/>k,4,Length_leg,Thickness_leg,0<br \/>k,5,Thickness_leg,Thickness_leg,0<br \/>k,6,Thickness_leg,Length_leg,0<br \/>k,7,0,Length_leg,0<br \/>k,8,0,Thickness_leg,0<\/p>\n<p>!!========Lines=========<\/p>\n<p>LSTR, 7, 6<br \/>LSTR, 7, 8<br \/>LSTR, 5, 6<br \/>LSTR, 8, 1<br \/>LSTR, 1, 2<br \/>LSTR, 5, 4<br \/>LSTR, 4, 3<br \/>LSTR, 3, 2<\/p>\n<p>LFILLT,1,3,Radius_2,0,<br \/>LFILLT,6,7,Radius_2,0,<br \/>LFILLT,3,6,Radius_1,0,<br \/>GPLOT<\/p>\n<p>!!=========Area=========<br \/>LSEL,S,LINE,,1,11 !!(AL COMMAND NOT WORKING SO USING LSEL TO SELECT ALL LINES AND PLOTING AREA)<br \/>AL,ALL<br \/>ALLS<\/p>\n<p>!!========Extrude Volume========<br \/>VEXT,1, , ,0,0,Total_Length,,,<br \/>ESYS, 0<\/p>\n<p>!!=======Meshing========<br \/>ASEL,S,AREA,,1,2,1<br \/>!AESIZE, ALL, LENGTH_LEG\/50,<br \/>AESIZE, all, Length_leg\/50,<br \/>ALLSEL,ALL<\/p>\n<p>EXTOPT,VSWE,AUTO,0 !SPECIFY SOURCE AND TARGET SURFACE FOR SWEEP<br \/>EXTOPT,ESIZE,50<\/p>\n<p>TYPE,1<br \/>MAT,1<br \/>MSHAPE,0,3D<br \/>MSHKEY,1<br \/>ALLSEL,ALL<br \/>Vsweep,ALL,1,2,1<\/p>\n<p>\/SOL<br \/>! ========Bolts ========<br \/>Bolt1_x = Thickness_leg*4<br \/>Bolt1_z = Thickness_leg*5<br \/>Bolt_dia = Thickness_leg<\/p>\n<p>!BLOCK, Bolt1_x, Bolt1_x+ Bolt_dia,0,Thickness_leg, Bolt1_z, Bolt1_z+ Bolt_dia<br \/>Nsel,s,loc,x, Bolt1_x, Bolt1_x+Bolt_dia<br \/>Nsel,r,loc,z, Bolt1_z, Bolt1_z+ Bolt_dia<br \/>D,ALL,,,,,,UX,UY,UZ<br \/>ALLSEL,ALL<\/p>\n<p>Nsel,s,loc,x,(Length_leg-Bolt1_x), (Length_leg-Bolt1_x)+Bolt_dia<br \/>Nsel,r,loc,z, Bolt1_z, Bolt1_z+ Bolt_dia<br \/>D,ALL,,,,,,UX,UY,UZ<br \/>ALLSEL,ALL<\/p>\n<p>Nsel,s,loc,x, Bolt1_x, Bolt1_x+Bolt_dia<br \/>Nsel,r,loc,z, (Total_Length-Bolt1_z),(Total_Length-Bolt1_z)+ Bolt_dia<br \/>D,ALL,,,,,,UX,UY,UZ<br \/>ALLSEL,ALL<\/p>\n<p>Nsel,s,loc,x,(Length_leg-Bolt1_x), (Length_leg-Bolt1_x)+Bolt_dia<br \/>Nsel,r,loc,z, (Total_Length-Bolt1_z),(Total_Length-Bolt1_z)+ Bolt_dia<br \/>D,ALL,,,,,,UX,UY,UZ<br \/>ALLSEL,ALL<br \/>!!====CONSTraints AT EDGE LINE<\/p>\n<p>LSEL,S,LINE,,19,20<br \/>NSLL,S,1<br \/>D,ALL,,,,,,UX,UY ! should not be ux constrained instead of uz?<br \/>ALLSEL,ALL<\/p>\n<p>!!====CONSTARINT AT EDGE LINE<br \/>LSEL,S,LINE,,5<br \/>LSEL,A,LINE,,8<br \/>CM,LINE_1,LINE<br \/>CMSEL,S,LINE_1,LINE<br \/>NSLL,S,1<br \/>D,ALL,,,,,,UX,UY,UZ<br \/>ALLSEL,ALL<br \/>GPLOT<\/p>\n<p>NSEL,ALL<br \/>ACEL,0,-9.8,0<\/p>\n<p>!!====imperfection============<br \/>\/SOL<br \/>antype,static<br \/>!PSTRES,1<br \/>Outres,all,all<br \/>allsell,all<br \/>solve<br \/>finish<\/p>\n<p>\/post1<br \/>pldisp,1<br \/>finish<\/p>\n<p>\/sol<br \/>antype,buckle<br \/>bucopt,lanb,2<br \/>mxpand,2,,,yes<br \/>solve<br \/>finsh<br \/>\/post1<br \/>set,first<br \/>pldisp,1<br \/>set,next<br \/>pldisp,1<br \/>finish<\/p>\n<p>\/prep7<br \/>upgeom,0.001,1,1,L_section,rst !0.01 is the scale factor which can be varied thus varing geometery<\/p>\n<p>!!=======Material Properties=======<\/p>\n<p>!elastic part<\/p>\n<p>!plastic<br \/>TB,BISO,1,1,2<br \/>TBTEMP,0<br \/>TBDATA,,f_y,0,,,,<\/p>\n<p>!===residual stress========<\/p>\n<p>\/SOL<br \/>!initial stress for the second part<br \/>NSEL,S,LOC,Y,0,Length_leg\/2<br \/>NSEL,R,LOC,X,0,0.1*Thickness_leg<br \/>INISTATE,SET,DATA,FUNC<br \/>INISTATE,SET,DTYP,STRE<br \/>INISTATE,define,ALL,,,,LINY,(-0.22*f_y),((0.92*f_y)\/Length_leg)<\/p>\n<p>!initial stress for the first part<br \/>NSEL,S,LOC,Y,Length_leg\/2,Length_leg<br \/>INISTATE,SET,DATA,FUNC<br \/>INISTATE,SET,DTYP,STRE<br \/>INISTATE,define,,,,,LINY,(0.73*f_y),((-0.98*f_y)\/Length_leg)<\/p>\n<p>!initial stress for the third part<br \/>NSEL,S,LOC,X,0,Length_leg\/2<br \/>NSEL,R,LOC,Y,0,Thickness_leg<br \/>INISTATE,SET,DATA,FUNC<br \/>INISTATE,SET,DTYP,STRE<br \/>INISTATE,define,,,,,LINX,(-0.22*f_y),((0.92*f_y)\/Length_leg)<\/p>\n<p>!initial stress for the forth part<br \/>NSEL,S,LOC,X,Length_leg\/2,Length_leg<br \/>NSEL,R,LOC,Y,0,Thickness_leg<br \/>INISTATE,SET,DATA,FUNC<br \/>INISTATE,SET,DTYP,STRE<br \/>INISTATE,define,,,,,LINX,(0.73*f_y),((-0.98*f_y)\/Length_leg)<\/p>\n<p>!!===LOADING CONDITIONS=====<br \/>force_12 = 5000 ! the value of the load<br \/>NSEL,S,LOC,Z,0,0<br \/>*GET, N_COUNTz, NODE,,COUNT<br \/>load_1=force_12\/N_COUNTz<br \/>f,all,fz,load_1<br \/>allsel,all<\/p>\n<p>NSEL,S,LOC,Z,Total_Length,total_length<br \/>*GET, N_COUNTd, NODE,,COUNT<br \/>load_2=force_12\/N_COUNTd<br \/>f,all,fz,-load_2<br \/>allsel,all<\/p>\n<p>!===nonlinear analysis============<\/p>\n<p>\/sol<\/p>\n<p>ANTYPE,0,new<br \/>NLGEOM,1<br \/>NSUBST,100,1000,50<br \/>NEQIT,1000<br \/>OUTRES,ERASE<br \/>OUTRES,ALL,ALL<br \/>solve<\/p>\n","protected":false},"template":"","class_list":["post-356128","topic","type-topic","status-closed","hentry","topic-tag-ansys-apdl","topic-tag-ansys-mapdl-1","topic-tag-ansys-mechanical-apdl","topic-tag-inistate-command-1","topic-tag-non-linear-buckling","topic-tag-steel-structure"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 4.9.10 - aioseo.com -->\n\t<meta name=\"description\" content=\"I have an issue with INISTATE command in Ansys 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LTB check | Ansys Learning Forum","twitter:description":"I have an issue with INISTATE command in Ansys Mechanical apdl, where i apply linear varying stress i tried checking through Inistate list command , but the stress dont seem to vary linearly , not sure how to go about, the task is LTB check in angled section non linear.i am not sure about the 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