{"id":343838,"date":"2024-01-09T15:50:24","date_gmt":"2024-01-09T15:50:24","guid":{"rendered":"\/forum\/forums\/reply\/343838\/"},"modified":"2024-01-09T15:50:24","modified_gmt":"2024-01-09T15:50:24","slug":"343838","status":"publish","type":"reply","link":"https:\/\/innovationspace.ansys.com\/forum\/forums\/reply\/343838\/","title":{"rendered":"Reply To: Discrepancy between LSPrepost and hand calculations -Shell element stress output"},"content":{"rendered":"

<p>Thank you for the reply. <\/p><p><span dir=”auto” data-originalcomputedfontsize=”16″ data-removefontsize=”true”>What I have understood yesterday while working is that the discrepancy occurred due to maxint in *Database_Extent_Binary and NIP(number of integration point) in *Section_Shell. I considered default maxint =3 while in *Section_Shell I considered nip as 2. <\/span><\/p><div dir=”ltr”> <\/div><div dir=”auto” data-originalcomputedfontsize=”16″ data-removefontsize=”true”>For shell fully integrated element, LSPREPOST showed results at reference surface which is middle surface and this is corresponding to first integration point. In case of maxint=3, there are middle surface(first integration point), inner surface (second integration point) and outer surface (third integration point).<\/div><div dir=”ltr”> <\/div><div dir=”auto” data-originalcomputedfontsize=”16″ data-removefontsize=”true”>So I revised the k file and used nip=3 and maxint =3 and when I read the first integration point results only it matched with lsprepost values. <\/div><div dir=”auto” data-originalcomputedfontsize=”16″ data-removefontsize=”true”>However, if elements are not distorted or for small displacement case, then the integration point results do not vary too much and the above thing does not matter.<\/div><div dir=”ltr”> <\/div><div dir=”auto” data-originalcomputedfontsize=”16″ data-removefontsize=”true”>I will ask a last thing now. When I checked the output file, the inner surface\/lower surface (second integration point) always have larger stress compared to middle surface (first integration point). <\/div><div dir=”auto” data-originalcomputedfontsize=”16″ data-removefontsize=”true”><span class=”markg7jmnkkb7 sbNPW” data-markjs=”true”>In this regard, what to do? Should I read only first integration point (middle surface) stress value to be consistent with lsprepost values or I should read the second integration point i.e. maximum stress value out of three integration points?<\/span><\/div><div dir=”ltr”> <\/div><p><span dir=”auto” data-originalcomputedfontsize=”16″ data-removefontsize=”true”>Thanks again.<\/span><\/p><\/p>\n","protected":false},"template":"","class_list":["post-343838","reply","type-reply","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