Re: [Yade-users] [Question #403426]: how to compute the shear strain

2016-10-26 Thread Bruno Chareyre
Question #403426 on Yade changed: https://answers.launchpad.net/yade/+question/403426 Status: Open => Answered Bruno Chareyre proposed the following answer: Not sure about the sign problem you see. The 0.5 is because the normal contact spin is obtained by averaging bodies spin. Bruno --

Re: [Yade-users] [Question #403426]: how to compute the shear strain

2016-10-26 Thread liukeqi
Question #403426 on Yade changed: https://answers.launchpad.net/yade/+question/403426 Status: Answered => Open liukeqi is still having a problem: Hi, Bruno, Thanks for your reply. But I still can not understand it. The formulas are following: (ΔuT )1 = -uT(last step)×(n(last

Re: [Yade-users] [Question #403426]: how to compute the shear strain

2016-10-25 Thread Bruno Chareyre
Question #403426 on Yade changed: https://answers.launchpad.net/yade/+question/403426 Bruno Chareyre posted a new comment: I forgot a multiplication by △t in the above equations. Let "v" be the rotation increment equal to spin times △t and the equations are correct. -- You received this

Re: [Yade-users] [Question #403426]: how to compute the shear strain

2016-10-25 Thread Bruno Chareyre
Question #403426 on Yade changed: https://answers.launchpad.net/yade/+question/403426 Status: Open => Answered Bruno Chareyre proposed the following answer: Hi, I understand the meaning my not be immediate but it is actually relatively simple. Let w be the spin vector of the grain pair.

[Yade-users] [Question #403426]: how to compute the shear strain

2016-10-24 Thread liukeqi
New question #403426 on Yade: https://answers.launchpad.net/yade/+question/403426 Hello, I read the part "DEM Background" on the YADE website, I confused by the "shear strain" because I could not understand the meaning of (△uT) 1,(△uT) 2. I found the similar question "Questions about