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Hello, as suggested in another thread in this Forum, i tried the usage of dresp3-Card. What i want to do: - let excel calculate the tresca-stress (Input: max principle, min principle, output: stress (=difference between both input variables). - get the tresca stress back and use it for an "minmax-" or "min-objective" in optimisation What i wrote until today: LOADLIB DRESP3 GR01 tresca.xlsx $solid DRESP1 1 MAX_PR1 STRESS PSOLID SMAP DRESP1 1 MAX_PR3 STRESS PSOLID SMIP DRESP3 20 TRESCA GR01 MYFUNC 1 2 + DRESP1 1 2 + CELLIN C2 C3 + CELOUT D1 I also use a small excel-file, which calculates the difference beween "cell C2" and "cell C3" in "cell D1". Questions: - would it work like that ? (I can't test it at the moment) - What do I get with the DRESP1 / DRESP3 ? When using DRESP1 with "ELEM" and enter an element-ID, it would give ONE value to the excel-file, which seems to be pretty clear. But when I use PSOLID as the PTYPE, there might be hundrets or thousands of values (here: principal stresses). At that point I do not understand my own programmed code.. Maybe someone can help? I read the Tutorial OS-4095 and also a lot of manual pages. Thanks a lot