Dear Chris,    Thank you for your reply and suggestion. Actually my intention is to do a "response surface optimization" using "factor of safety" as an optimization goal. The results are already made with the full range of principal stress with having zero in the range to show the areas in tension and compressive stress.    Thank you. Best Regards, Rashiga Korea University of Science and Technology   P.S - Dear XANSYS members please accept my apologies for the inconvenience caused by not answering this email thread in a single email. -----------------------Original message----------------------- From: "chrisw@skypoint.com "<chrisw@skypoint.com> To: XANSYS Mailing List Temporary Home <xansys-temp@xansystest.info> Sent date: 2019-02-24 05:21:59 GMT +0900 (ROK) Title: Re: [Xansys] Extracting "user defined results"       > On Feb 23, 2019, at 9:32 AM, Neil Dencklau <denck007@umn.edu> wrote:   >   >> I need to calculate "factor of safety" for a brittle material using   >> "elemental" max. principal stress. Since the default "factor of safety" is   >> based on "nodal" stress. I'm planning to use "user defined results".   >> But I only need to extract the positive max. principal stress neglecting   >> any negative values.   >> How can I do it? I'm using ANSYS Mechanical workbench.     If you're looking just to make a plot you can do it real easy by setting the contour values to range from 0 to whatever your max value is. No need to write any code to exclude anything. As a practical matter you're wasting your time with this whole exercise of excluding compressive stresses. Anyone with any sense will understand that there are areas of compressive stress that are to be ignored. Your display will look a lot more professional if you present all the data. But that's your call.     Christopher Wright P.E. |"They couldn't hit an elephant at   chrisw@skypoint.com | this distance" (last words of Gen.   .......................................| John Sedgwick, Spotsylvania 1864)   http://www.skypoint.com/members/chrisw/         _______________________________________________   Xansys-temp mailing list   Xansys-temp@xansystest.info   http://xansystest.info/mailman/listinfo/xansys-temp_xansystest.info   If you are receiving too many emails from XANSYS please consider changing account settings to Digest mode which will send a single email per day.     Please send administrative requests such as deletion from XANSYS to xansys-mod@tynecomp.co.uk and not to the list      

Sorry about that. The reason the max(0,S1) does joy work is because of a type mismatch. 0 is a float or integer, S1 is an array/list. Apparently the max function is only meant to work element wise. S1/S1 works because it returns an array/list of 1's. S1*0 would also work because it will return an array/list of 0's before running the max function ( think order of operations). Neil Dencklau University of Minnesota On Tue, Feb 26, 2019, 7:07 AM "라쉬" <rashi@koreatech.ac.kr> wrote: > Dear Chris, > > Thank you for your reply and suggestion. Actually my intention is to do a > "response surface optimization" using "factor of safety" as an optimization > goal. The results are already made with the full range of principal stress > with having zero in the range to show the areas in tension and compressive > stress. > > Thank you. > Best Regards, > Rashiga > Korea University of Science and Technology > > P.S - Dear XANSYS members please accept my apologies for the inconvenience > caused by not answering this email thread in a single email. > > > -----------------------Original message----------------------- > From: "chrisw@skypoint.com "<chrisw@skypoint.com> > To: XANSYS Mailing List Temporary Home <xansys-temp@xansystest.info> > Sent date: 2019-02-24 05:21:59 GMT +0900 (ROK) > Title: Re: [Xansys] Extracting "user defined results" > > > > > On Feb 23, 2019, at 9:32 AM, Neil Dencklau <denck007@umn.edu> wrote: > > > > > >> I need to calculate "factor of safety" for a brittle material using > > >> "elemental" max. principal stress. Since the default "factor of safety" > is > > >> based on "nodal" stress. I'm planning to use "user defined results". > > >> But I only need to extract the positive max. principal stress neglecting > > >> any negative values. > > >> How can I do it? I'm using ANSYS Mechanical workbench. > > > If you're looking just to make a plot you can do it real easy by setting > the contour values to range from 0 to whatever your max value is. No need > to write any code to exclude anything. As a practical matter you're wasting > your time with this whole exercise of excluding compressive stresses. > Anyone with any sense will understand that there are areas of compressive > stress that are to be ignored. Your display will look a lot more > professional if you present all the data. But that's your call. > > > Christopher Wright P.E. |"They couldn't hit an elephant at > > chrisw@skypoint.com | this distance" (last words of Gen. > > .......................................| John Sedgwick, Spotsylvania 1864) > > http://www.skypoint.com/members/chrisw/ > > > > > _______________________________________________ > > Xansys-temp mailing list > > Xansys-temp@xansystest.info > > http://xansystest.info/mailman/listinfo/xansys-temp_xansystest.info > > If you are receiving too many emails from XANSYS please consider changing > account settings to Digest mode which will send a single email per day. > > > Please send administrative requests such as deletion from XANSYS to > xansys-mod@tynecomp.co.uk and not to the list > > > > > _______________________________________________ > Xansys-temp mailing list > Xansys-temp@xansystest.info > http://xansystest.info/mailman/listinfo/xansys-temp_xansystest.info > If you are receiving too many emails from XANSYS please consider changing > account settings to Digest mode which will send a single email per day. > > Please send administrative requests such as deletion from XANSYS to > xansys-mod@tynecomp.co.uk and not to the list >