I exported stiffness and mass matrix of the bending beam in a txt-file because I want to programme the same scenario with the exported matrices in Matlab for my project. For the export I used these APDL-commands that saves the stiffness matrix in a txt-file:<\/p>\n
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*SMAT,MatKS,D,IMPORT,FULL,file.full,STIFF<\/em><\/div>\n
*PRINT,MatKS,Ksparse.txt<\/em><\/div>\n
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Unfortunately, I was not able to calculate similar results for the maximal displacements in Matlab with the exported matrix (vary about factor 1000 compared with Ansys analysis). After checking my code and workflow several times without finding my error I was wondering if the units of the exported matrices could be responsible for the error. I used a metric unit system for the Ansys simulation (m, kg, N, s, V, A)<\/em> and due to the basic equation K u = f<\/em> I assumed that the unit of the stiffness matrix K is [N\/m]<\/em>.<\/div>\n
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Is my assumption for the exported stiffness matrix correct or are there different units used for the export? If I am wrong, what unit is used for the exported mass matrix in addition?<\/div>\n
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Thank you for reading my post, I am looking forward to receiving your respond.<\/div>\n","protected":false},"template":"","class_list":["post-290521","topic","type-topic","status-closed","hentry","topic-tag-mechanical-apdl","topic-tag-units"],"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\n\t\t\n\t\t\n\t\t