flat shell is divided into three regions: (I) undelaminated, (II) above<\/span>
delamination interface, and (III) below delamination interface. These<\/span>
regions are denoted in the cross–section through delamination shown<\/span>
in figure 2. In the flat shell, all spectral elements are located at the<\/span>
neutral plane. There are two layers of elements at the delamination<\/span>
region with zero gap between them. In other words, at the delamination<\/span>
are two shell elements on top of each other that have the<\/span>
same nodal positions but the nodes are not merged. On the boundary<\/span>
of the delamination, the nodes of all shell elements are then<\/span>
again merged.” [2]<\/span><\/p>\n
Any idea how to achieve this? Would it be possible to define two layered sections on the same surface element, splitting the layers into two sections? I tried this but I am having issues with the layered section offset.<\/p>\n
In a handbook<\/a> for realease 18.2 layered sections (for the quadratic shell element 281) are discussed and it states:<\/p>\n “<\/span>Value that locates the node with respect to the default origin (midplane) of the section. Valid only when i.e. the offset defines the out of plane displacement of the middle of the section…? This doesn’t seem to be the case in v231. Since I always have had the offset set to “top” in the hope that the excitation is at the surface I’d like to apply the defects in a similar manner.<\/p>\n For reference, above is the Open Guided Waves SHM-plate in ansys.<\/p>\n The second question is regarding to the offset, how does it work?<\/p>\n As an example I added one layer of aluminum on top of the defect D22. For all cases the rest of the plate has the offset “top” and the defect has offset “user defined” at:<\/p>\n I am probably confusing myself, but I cannot figure out what to do to get the top 2mm aluminum layer of the defect to sit on top of the plate, exactly like the 0mm image. These images also show the mesh, I don’t know if this is by scale \/ the proportions fit.<\/p>\n By my logic, “top” should be the same as “-1mm” but it seems to be inverted…<\/p>\n Thanks in advance, I hope I was clear enough.<\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n <\/p>\n Moll, J.; Kathol, J.; Fritzen, C.-P.; Moix-Bonet, M.; Rennoch, M.; Koerdt, M.; Herrmann, A.; Sause, M.; Bach, M.: Open Guided Waves – Online Platform for Ultrasonic Guided Wave Measurements<\/em>, Structural Health Monitoring, 2019, vol. 18(5–6), 1903–1914, DOI: 10.1177\/1475921718817169<\/a><\/p>\n<\/li>\nLocation<\/code><\/em> = USER. <\/span>The offset alters only the reference surface<\/em><\/span> of the shell elements (that is, where the nodes are located). It does not change the physical dimensions of the shell itself; the volume and mass remain constant when an offset is specified.<\/span>” [3]<\/span><\/p>\n![\"\"](\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/07-08-2023-1691407198-dmg_plate.png\")
<\/a><\/p>\n![\"\"](\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/07-08-2023-1691408747-0.png\")
<\/a> 0 mm<\/p>\n![\"\"](\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/07-08-2023-1691408771-2e-3.png\")
<\/a> +2mm<\/p>\n![\"\"](\"\/forum\/wp-content\/uploads\/sites\/2\/2023\/08\/07-08-2023-1691408801--2e-3.png\")
<\/a> -2mm<\/p>\n\n