{"id":435441,"date":"2025-06-26T06:33:03","date_gmt":"2025-06-26T06:33:03","guid":{"rendered":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/some-questions-on-submodelling\/"},"modified":"2025-06-26T07:04:32","modified_gmt":"2025-06-26T07:04:32","slug":"some-questions-on-submodelling","status":"publish","type":"topic","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/topic\/some-questions-on-submodelling\/","title":{"rendered":"Some questions on Submodelling"},"content":{"rendered":"

<p><p><p class=”MsoNormal”>Hi all,<\/p><p class=”MsoNormal”>I just recently started to explore the use of submodelling in static structural with a simple model, but I encountered some problems in the process.<\/p><p class=”MsoNormal”> <\/p><p class=”MsoNormal”><u>CONTROL CASE:<\/u><\/strong><br>Two SHS 50X5 joined together as a T joint. Two ends are fixed and load is applied onto the remaining end.<br>Mesh size is 2.5mm, and the result is as below.<\/p><p class=”MsoNormal”><span style=”color: windowtext; mso-no-proof: yes; text-decoration: none; text-underline: none;”><!– [if gte vml 1]><v:shapetype id=”_x0000_t75″ coordsize=”21600,21600″ o:spt=”75″ o:preferrelative=”t” path=”m@4@5l@4@11@9@11@9@5xe” filled=”f” stroked=”f”> <v:stroke joinstyle=”miter”\/> <v:formulas> <v:f eqn=”if lineDrawn pixelLineWidth 0″\/> <v:f eqn=”sum @0 1 0″\/> <v:f eqn=”sum 0 0 @1″\/> <v:f eqn=”prod @2 1 2″\/> <v:f eqn=”prod @3 21600 pixelWidth”\/> <v:f eqn=”prod @3 21600 pixelHeight”\/> <v:f eqn=”sum @0 0 1″\/> <v:f eqn=”prod @6 1 2″\/> <v:f eqn=”prod @7 21600 pixelWidth”\/> <v:f eqn=”sum @8 21600 0″\/> <v:f eqn=”prod @7 21600 pixelHeight”\/> <v:f eqn=”sum @10 21600 0″\/> <\/v:formulas> <v:path o:extrusionok=”f” gradientshapeok=”t” o:connecttype=”rect”\/> <o:lock v:ext=”edit” aspectratio=”t”\/> <\/v:shapetype><v:shape id=”Picture_x0020_14″ o:spid=”_x0000_i1036″ type=”#_x0000_t75″ alt=”A diagram of a metal beam AI-generated content may be incorrect.” href=”https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/06\/26-06-2025-1750918188-mceclip0.png” style=’width:451.5pt;height:397.5pt;visibility:visible;mso-wrap-style:square’ o:button=”t”> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image001.png” o:title=”A diagram of a metal beam AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–><span style=”mso-ignore: vglayout;”>\"A<\/span><!–[endif]–><\/span><\/a><span style=”color: windowtext; mso-no-proof: yes; text-decoration: none; text-underline: none;”><!– [if gte vml 1]><v:shape id=”Picture_x0020_13″ o:spid=”_x0000_i1035″ type=”#_x0000_t75″ alt=”A blue and yellow colored tube AI-generated content may be incorrect.” href=”https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/06\/26-06-2025-1750918401-mceclip1.png” style=’width:451.5pt;height:387pt;visibility:visible;mso-wrap-style:square’ o:button=”t”> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image003.png” o:title=”A blue and yellow colored tube AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–><span style=”mso-ignore: vglayout;”>\"A<\/span><!–[endif]–><\/span><\/a><br><br><span style=”mso-no-proof: yes;”><!– [if gte vml 1]><v:shape id=”_x0000_i1034″ type=”#_x0000_t75″ alt=”A blue pipe with a blue background AI-generated content may be incorrect.” style=’width:423.75pt;height:408pt;visibility:visible;mso-wrap-style:square’> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image005.png” o:title=”A blue pipe with a blue background AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–>\"A<!–[endif]–><\/span><br style=”mso-special-character: line-break;”><!– [if !supportLineBreakNewLine]–><br style=”mso-special-character: line-break;”><!–[endif]–><\/p><p class=”MsoNormal”><u>CASE<\/u> 1 (SOLID-TO-SOLID):<\/strong><br>Increase the mesh size up to 10mm (while face meshing the profile remains as two layers).<br>And then the joint (50mm distance from the joint) submodelled, with mesh size 2.5mm same as control case.<br>Stress distribution seems matched with the control case (although the area is larger and value is significantly higher).<br><br><span style=”mso-no-proof: yes;”><!– [if gte vml 1]><v:shape id=”_x0000_i1033″ type=”#_x0000_t75″ alt=”A blue and green object with red dots AI-generated content may be incorrect.” style=’width:451.5pt;height:5in;visibility:visible;mso-wrap-style:square’> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image006.png” o:title=”A blue and green object with red dots AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–>\"A<!–[endif]–><\/span><br style=”mso-special-character: line-break;”><!– [if !supportLineBreakNewLine]–><br style=”mso-special-character: line-break;”><!–[endif]–><\/p><p class=”MsoNormal”><span style=”mso-no-proof: yes;”><!– [if gte vml 1]><v:shape id=”_x0000_i1032″ type=”#_x0000_t75″ alt=”A blue and green tube with a red label AI-generated content may be incorrect.” style=’width:399pt;height:375pt;visibility:visible;mso-wrap-style:square’> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image008.png” o:title=”A blue and green tube with a red label AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–>\"A<!–[endif]–><\/span><\/p><p class=”MsoNormal”><br><u>CASE 2 (SHELL-TO-SOLID):<\/u><\/strong><br>Midsurface the base solid model into shell model. Mesh size at 2.5mm same as control case.<br>And then submodel the joint (50mm distance from the joint) submodelled, with same mesh size 2.5mm<br>Stress values and area seems similar to control case, but some nodes at the cut surface are having high stress result, especially on the cut face.<br><br><span style=”color: windowtext; mso-no-proof: yes; text-decoration: none; text-underline: none;”><!– [if gte vml 1]><v:shape id=”Picture_x0020_11″ o:spid=”_x0000_i1031″ type=”#_x0000_t75″ alt=”A blue and green object with a red text AI-generated content may be incorrect.” href=”https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/06\/26-06-2025-1750919085-mceclip4.png” style=’width:429pt;height:421.5pt;visibility:visible;mso-wrap-style:square’ o:button=”t”> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image009.png” o:title=”A blue and green object with a red text AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–><span style=”mso-ignore: vglayout;”>\"A<\/span><!–[endif]–><\/span><\/a><\/p><p class=”MsoNormal”><span style=”color: windowtext; mso-no-proof: yes; text-decoration: none; text-underline: none;”><!– [if gte vml 1]><v:shape id=”Picture_x0020_10″ o:spid=”_x0000_i1030″ type=”#_x0000_t75″ alt=”A grid cube with a red sign AI-generated content may be incorrect.” href=”https:\/\/innovationspace.ansys.com\/forum\/wp-content\/uploads\/sites\/2\/2025\/06\/26-06-2025-1750919123-mceclip5.png” style=’width:342pt;height:420pt;visibility:visible;mso-wrap-style:square’ o:button=”t”> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image010.png” o:title=”A grid cube with a red sign AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–><span style=”mso-ignore: vglayout;”>\"A<\/span><!–[endif]–><\/span><\/a><\/p><p class=”MsoNormal”><span style=”mso-no-proof: yes;”><!– [if gte vml 1]><v:shape id=”_x0000_i1029″ type=”#_x0000_t75″ alt=”A blue and red pipe with a cross AI-generated content may be incorrect.” style=’width:390.75pt;height:417pt;visibility:visible;mso-wrap-style:square’> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image012.png” o:title=”A blue and red pipe with a cross AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–>\"A<!–[endif]–><\/span><span style=”mso-spacerun: yes;”> <\/span><br><br><u>CASE 3 (SHELL-TO-SOLID):<\/u><\/strong><br>Midsurface the base solid model into shell model. Mesh size set at 10mm.<br>And then submodel the joint (50mm distance from the joint) submodelled, with mesh size 2.5mm same as control case.<br>Stress values and area seems similar to Case 1, but some nodes at the cut surface are having high stress result, especially on the cut face too.<br><br><span style=”mso-no-proof: yes;”><span style=”mso-spacerun: yes;”> <\/span><!– [if gte vml 1]><v:shape id=”_x0000_i1028″ type=”#_x0000_t75″ alt=”A blue and green colored object with text AI-generated content may be incorrect.” style=’width:400.5pt;height:451.5pt;visibility:visible;mso-wrap-style:square’> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image013.png” o:title=”A blue and green colored object with text AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–>\"A<!–[endif]–><\/span><\/p><p class=”MsoNormal”><span style=”mso-no-proof: yes;”><!– [if gte vml 1]><v:shape id=”_x0000_i1027″ type=”#_x0000_t75″ alt=”A colorful square object with a blue background AI-generated content may be incorrect.” style=’width:218.25pt;height:275.25pt;visibility:visible;mso-wrap-style:square’> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image014.png” o:title=”A colorful square object with a blue background AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–>\"A<!–[endif]–><\/span><\/p><p class=”MsoNormal”><span style=”mso-no-proof: yes;”><!– [if gte vml 1]><v:shape id=”_x0000_i1026″ type=”#_x0000_t75″ alt=”A blue and yellow colored tube AI-generated content may be incorrect.” style=’width:390pt;height:400.5pt;visibility:visible;mso-wrap-style:square’> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image015.png” o:title=”A blue and yellow colored tube AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–>\"A<!–[endif]–><\/span><\/p><p class=”MsoNormal”><span style=”mso-no-proof: yes;”><!– [if gte vml 1]><v:shape id=”Picture_x0020_1″ o:spid=”_x0000_i1025″ type=”#_x0000_t75″ alt=”A blue square with green and yellow spots AI-generated content may be incorrect.” style=’width:315pt;height:371.25pt;visibility:visible;mso-wrap-style:square’> <v:imagedata src=”file:\/\/\/C:\/Users\/YawFang\/AppData\/Local\/Temp\/msohtmlclip1\/01\/clip_image016.png” o:title=”A blue square with green and yellow spots AI-generated content may be incorrect”\/> <\/v:shape><![endif]–><!– [if !vml]–>\"A<\/p><p> <\/p><p> <\/p><p class=”MsoNormal”>My questions are:<\/p><\/p>\n

    <li class=”MsoNormal” style=”mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;”>How the initial mesh size of the “base” setup affect the result?<br>As from the result above, the base setups with mesh size 2.5mm have similar result (Control Case and Case 1).<br>Then another similar result for base setups with mesh size 10mm (Case 1 and Case 3).<br><br>Just realized I should look at the strain result since I am running non-linear material properties. From strain result, the area seems similar. Attached the strain result.<br><br style=”mso-special-character: line-break;”><!– [if !supportLineBreakNewLine]–><br style=”mso-special-character: line-break;”><!–[endif]–><\/strong><\/li>\n

    <li class=”MsoNormal” style=”mso-list: l0 level1 lfo1; tab-stops: list 36.0pt;”>Why is it that some of the nodes at the cut surface is having irregularly high stress\/strain points?<br>(Refer to the last picture in Case 3, although the value itself seems fine, but is relatively high compared to the surrounding nodes)<\/li>\n<\/ol>\n

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